Cis fuel mixture adjustment

Cis fuel mixture adjustment

Re-install mailbox and go for a drive then re-check AFR/CO. 3. The adjuster mixture screw does is, set the position of the plate during idle higher or lower. #6 · Aug 23, 2003. Once warmed up, the idle drops to a nice normal and steady 900 rpms. Remember right= rich. If your engine looks like this, then someone swapped the 3. It has the CIS injection system with the EHA valve on the side of the fuel distributor. Test the heater gets hot. To set the mixture, you'll need a LONG 3 mm Allen key. Not enough to burn you, but once you notice it getting hot, you are good to go. We go through the correct pressures, system, and control pressures, to find the running issues we have with this engine. Posts: 3,718. The dedicated shade tree mechanic can do it, but needs to be well-informed first. Making a bad situation worst. 8L 8v air/fuel mixture (richard@vwgb. Though he is currently semi-retired, he is still the owner and hanging out around the shop frequently. Now set the mixture between those two points. CIS Fast Idle Speed. Hi guys I sent this to souk (he is the guru) in a pm, but then I thought it would be best to have it on the forum so it is searchable for other users. #1 Sep 8, 2007. pdf' shows the regeneration valve. Not only will too rich a mixture waste fuel but too lean a mixture produces less power per engine cycle and ends up consuming more fuel per mile. Connect -ve COM lead of multimeter to X11 socket pin #2, and +ve lead to #3. For such a slight adjustment the engine is peppier and to me somewhat quieter and smoother on acceleration. 86 TR (US) I am working on a right bank KE Jetronic unit that is flowing fuel to the cold start just fine, but nothing to the injectors. scale to check the duty cycle, usually 40-50 degrees on a normal operating temp engine or roughly 50% duty cycle. If the engine vacuum and/or engine speed increases, then adjust the passenger side idle mixture screw the same amount and monitor the vacuum reading. Dec 2, 2009 · The first thing to do with CIS is to measure your cold CP, hot CP, and fuel pressure before you start adjusting stuff. Sort by Oldest first. It could take several tries to get it perfect. *SOLD*: '87 930 GP White - heroin would have been a cheaper addiction Feb 14, 2011 · I am wondering if there is any way of adjusting the mixture or in my case (leaning) a cis system to deliver less fuel overall? possibly by adjusting the air flapper or maby something simple on the fuel distribution head? Dec 22, 2011 · Pressures all look in range for your cis. Mar 4, 2011 · Mixture Adjustment in K-Jet & LH - 200/700/900 Models. Uses a 3mm hex-key after removing the grub screw (small blade screw-driver). Connect CO level tester and separate tachometer according to instructions of manufacturer. One of the more common issues that come up with regard to the drivability of the CIS-E-based cars (420s and 560s, among other lesser cars such as M102 and M103-based models) are the two major system adjustments -- the duty cycle (controlled by the CIS-E mixture control) and the fuel injection control pressure (controlled in part by the EHA servo). May 8, 2008 · What do you guys do regarding the mixture adjustment hole atop the CIS mixture control unit after completing an adjustment? Do you plug the hole with Sep 16, 2012 · Counterclockwise = leaner. What concerns me is accessing the rear of the unit without lowering the engine. My dwell meter reads in degrees, not duty cycle, so I have to convert: 30 deg. May 23, 2023 · Here is another critical process you should know in order to setup your Bosch CIS K-Jetronic system. Porsche 911 DIY Repair Blog: http://joe-engineer. #2 · Apr 3, 2007. By Per Schroeder. You normally would make a fuel mixture adjustment ~1/12th turn and check results. I use two of these when adjusting the mixture on a TR or one on a 308/328, as you need to plug the hole to keep the unmetered air leak from causing a lean mixture. So, at higher RPM, the plate doesn't even touches the adjuster screw, so this is why I think it only affects the idle. This result tells you that the frequency valve is functioning correctly. As you pushe it down (CW) it sends more fuel to the system as if it sucking more air. The mixture control is on the Since adjusting the mixture Over time, the CIS-E injection system's factory calibrated settings may no longer be optimal due to wear and tear, aging, or outright replacement of fuel system components. To adjust the fuel mixture screw, turn it in until the engine stumbles or engine speed decreases. wgc, Luke806905 and BroncoLee. 2) The fuel pressure differential between the upper and lower chambers of the fuel distributor, which should also be checked. This is their tool number 49064 (906QE-3x200). Try backing the mixture screw to half or more of your 1/2 turn and May 9, 2008 · This is a CIS engine. I would just put two of these in the airflow May 27, 2012 · One of the more common issues that come up with regard to the drivability of the CIS-E-based cars (420s and 560s, among other lesser cars such as M102 and M103-based models) are the two major system adjustments -- the duty cycle (controlled by the CIS-E mixture control) and the fuel injection control pressure (controlled in part by the EHA servo). The basic curves based on fuel pressures for cold and warm operations are set by the WUR - but mixture fine tuning is set by the single screw on the Fuel Distributor. The Fuel Distributor (FD) varies the amount of fuel sent to each injector. I use a labscope with a duty cycle function, looking for ~50%. Mar 8, 2023 · Begin by adjusting the driver side idle mixture screw in (clockwise) approximately 1/8th of a turn while monitoring the vacuum gauge. turn mixture screw 1-2 full turns counter-clockwise. Note: I am focusing on NA cars but 930 Turbo and early 965 Turbo Sep 29, 2023 · DIY Videos: How To Adjust Fuel Mixture on Porsche 911 Bosch CIS K-Jetronic Fuel Injection. 5~3. Nov 20, 2023 · To change the idle speed, evenly turn each of the six air-correction screws. Turn the mixture screw counter clockwise to make it leaner, an 1/8 of a turn makes May 18, 2010 · Helmut. Mar 27, 2010 · Graph of air/fuel mixture vs power output. #1 · Jan 6, 2015. Disconnect vacuum line A to the valve and seal both ends with a rubber plug. Jun 15, 2018 · So, whenever you read about “mixture adjustment“ in CIS-E car forums, there is a high probability that it reveals a misconception about the widely underestimated piece of mechanical engineering that the KE-Jetronic is. DESCRIPTION. After the engine is warm, you simply set the idle mixture and air bypass so that you get Nov 6, 2010 · 22890 posts · Joined 2006. I have been told that the CIS system on my 1983 SC is sealed and you can not adjust the fuel mixture. Note the table under Testing for these numbers. 7) into the 1984. Turn (in 1/4 turn increments) right to richen, and left to lean the mixture. Mar 18, 2011 · Currently, my on-boost CP is set at 48 psi (Adjustment is a high tech process using c-clamps while applying boost pressure with an air compressor while measuring fuel pressure. Garage. Covers adjusting the idle stabilizer, CO, and the differential pressure regulator. I know that it's right = rich and left = lean. Pull the fuel filler cap. Link to Fuel Injection section, Technical Tips Oct 21, 2012 · Actually I did make a very slight adjustment to the idle mixture screw this morning using a 3mm allen wrench, turned the screw about 1/16th rev clockwise to enrich and the results were fairly significant. When removing fuel lines, always hold the hex fitting on the component with one wrench while loosening the fuel line with another wrench. Anything over 3 out is an indication you need a larger pilot jet. 1977 Porsche 911S 2. Feb 17, 2011 · You can use a digital dwell meter, set on the 4cyl. Adjusting it can and does mask other issues. Idle speed and mixture are ajusted in conjunction. 80mm screw. 5 but the screw will be a little loose and won't hold proper adjustment. K-Jetronic Porsche Always use new gaskets, seals and 0-rings when installing components or fuel lines. When performing tests on the CIS, a pressure gauge is a neccesary tool. 5 turns back- messed my entire fuel ratio up. 1979 928 5 spd. Step 3. Jul 2, 2013 · If you have gone over everything else, THEN adjust the mixture using the 3mm Allen screw. The 944S and S2 models use a system called "adaptive idle speed volumetric efficiency regulation" and do not require idle speed adjustment. 6. 5mm 3. #1 · Nov 6, 2010. Both CIS and CIS-E use it's signal to try to make the fuel ration stick to the ideal ratio where the cat works the best. You will need a 3mm (I believe) long handle allen wrench to set the adjustment screw. The aluminum "Anti-tamper" plug is destroyed in the removal process. Apr 30, 2021 · Simply changing the mixture by adjusting the fuel pressure won't add more horsepower - it will simply make the car run richer. We have replaced everything from the fuel tank back to the pump, filter, accumulator and lines—the fuel distributor itself was just cleaned Sep 1, 2006 · So, following the swap from a 1. At a flat 53 psi, I have been getting low 12 AFR's when boost hits (around 12. Feb 27, 2023 · S3E10 in this episode I will show you how to unfreeze the VW Mk1 CIS fuel distributor idle mixture screw. This is the most blatant mistakes committed by people trying to fix their CIS problem. you bigger tool is just riding along the top of the allen. 5T with the first CIS. Improper fuel mixture is the easiest way to lose MPG. cis-e fuel mixture adjustment screw size??? 830 Views 5 Replies 2 Participants Last post by piledriver, Oct 11, 2008. Remove the fuel distributor from your car. Here is a pair of videos explaining how to adjust your fuel mixture on nearly every normally aspirated Porsche 911 running CIS. 3mm allen wrench 4. . Pull injectors with lines attached and place in clear jars to see fuel flow. However, it requires clean fuel and pressures set to the correct specifications. Dec 23, 2011 · Soukus' thread about air-fuel mixture adjustment has been very helpful and valuable to CIS DIY'ers. __________________. Typical Pressure Readings with Pressure Guage Connected. Dec 29, 2020 · brief description of how and where to adj idle on 911 with K jetronic May 17, 2005 · As above, the mixture adjusting screw is located inside your upper airbox housing, between the rubber intake boot and the fuel distributor. Best to have the air-fuel ratio checked/set using a gas analyzer. Aug 13, 2011 · Location: Nash County, NC. Share. Greetings. I've been told that I should since I've just installed a larger engine. I've owned a couple of CIS California cars and they are a pain in the rear to deal with as they have an aftermarket Frankenstein jetronic box hooked to a narrow band 02 Apr 30, 2023 · Porsche 911 DIY Repair Blog: http://joe-engineer. Feb 7, 2013 · A - idle speed and idle mixture adjustments are absolutely different things. The idle mixture is the configuration of air-to-fuel ratio which on some carburetors can be controlled via an "air screw" and on some others via a "fuel screw". com) Mixture screw is on the air box like said, it's a 3mm allen key, the air screw is the one on the throttle body, the brass one. This particular air/fuel ratio enhances the operation of the Catalytic convertor, with which the Lambda system was designed to operate. Sep 3, 2014 · Tuning CIS Fuel Injection. The early cars had an additional fuel flow path through the Throttle Control Pressure Regulator which provided additional mixture adjustment according to throttle position. You want to connect the dwell meter to pin 2 (signal) and 3 (ground). pdf'. I'm surprised that the RR does not have it. 0 turns out off a light seat. FUEL INJECTION SYSTEM - BOSCH CIS-E. Oct 5, 2006 · Firstly, it is important to have a good oxygen sensor for your car's mixture to be correct. Look for a small hole between the fuel distributor and the air sensor plate housing. Apr 11, 2020 · Bosch K-Jetronic CIS fuel tuning procedure. Turn on ignition and pull the safety switch or jumper the fuel pump relay socket to force pump to run. #6 · Feb 20, 2010. Aug 21, 2021 · Fuel pressures are an important factor when setting up a C. This video is a next step assuming you have just done some major repairs such as an engine rebuild, whole CIS system rebuild, sealed major vacuum leaks, or rebuilt the fuel distributor and warm up regulator. 2011-03-04 - IPD Staff. With Mercedes suggests that special tools are required to adjust the mixture on the Bosch KE3-Jetronic (CIS-E) fuel injection, such as is used on the 1988-91 560 series motors. 14210 posts · Joined 2002. Drill bit - 2. Adjust mixture counter-clockwise until it misses (note position of allen wrench) then turn clockwise until it misses (note position again). Apr 24, 2022 · Here's how I understand the CIS-E mixture dilemma. 7 parts of air. Mar 7, 2019 · It’s good practice to clean the intake at 25-30k miles and do a major service :-oil and filter, plugs, air filter, fuel filter and check and adjust belts, check timing, lube linkages clean out sunroof drains. Feb 3, 2020 · Step 2. 30°30'40" N 97°35'41" W (Texas) Full Name: Steve Magnusson. Start the car and get a warm AFR/CO reading. 1. Oct 23, 2008 · What is the metric size of this CIS allen wrench used to adjust the fuel mixture? How long of a straight shaft will i need? Idle speed adjustment is not normally required on 944s. The higher the duty cycle the richer the computer is trying to make the mixture. :thumbsup: There are two fuel system adjustments: -. Set the approximate idle speed like Jim says, then insert the Allen key and fish for the small hex set-screw. Bosch KE-Jetronic Continuous Injection System Mechanical Fuel Injection Overview Part 1of 6. Port Saint Lucie, Fl. The idle speed is the speed at which your engine idles, obviously. This 6 page procedure is designed to guide you through setting a baseline fuel tune on your early 928 with Bosch K-Jetronic CIS. Applicable for Bosch CIS K-Jetronic cars 1973-1983. com/Step by step process on how to setup the initial fuel mixture on air-cooled Porsche 911s running Bosch C Sep 7, 2007 · At the WUR, control pressure is managed. 12968 posts · Joined 2001. s. kach22i's Garage. a 5. The fuel injection system used on all Mercedes-Benz gasoline engine vehicles uses a basic Oct 6, 2008 · CIS Injection. 1) Lambda control (duty cycle), which is controlled electronically by the CIS-E computer (N3), and. 6 by redline. The screw you are turning adjusts the sensor plate within the air horn, affecting the A/F mixture at idle only. mark e. My car has no lambda sensors, it says on the Oct 15, 2019 · Most CIS Systems have an adjustment with a 3mm allen in front of the air flow meter that allows you to adjust the fuel mixture. When you said you enriched the idle a bit by turning the allen screw in the distributor a 1/2 turn? That is a huge adjustment. While it has helped many, it has mislead people too. All times are GMT -8. Dec 6, 2023 · 3. The injectors were removed and each line was put into burettes to collect fuel but there is no flow in any of them. Feb 8, 2009 · The mixture adjustment allen screw is 3mm and is hidden from plain view by either a: -Pressed in aluminum plug. Usually, the "screw-type" anti-tamper can be easily removed and reinstalled after the mixture adjustment is done. This is where I can use some instruction as I am Nov 18, 2004 · The 3mm is a physical adjustment, moving the actual plunger, adding more fuel, and then the DPR is an electromagnet, and it can make small adjustments in the pressure (mixture), but only to a certain extent. When installing the mixture control unit, tighten the Apr 15, 2021 · About Press Copyright Contact us Creators Advertise Developers Terms Privacy Policy & Safety How YouTube works Test new features NFL Sunday Ticket Press Copyright Aug 20, 2015 · Next, fig 5 on the last page of the 'KE jetronic mixture adjustment. 5-12. Keeping the mixture regulated at the proper levels for power is the best way to go for both power and emissions, and the factory did a pretty good job of that. 21801 SW ROCK CREEK RD. About 200mm (8 3/4 inches) long. May 22, 2015 · Early 928's with CIS injection systems use a warm-up regulator to adjust fueling depending on engine temperature. So, I tried turning the screw to the Jan 6, 2015 · 137 posts · Joined 2005. Disconnect the negative cable from the battery. I. This doesn't mean these are the only ways Mar 3, 2014 · Green weenie (Jag XJS) Big Kitty. A fine German Made tool that will allow you to do the job right. Newer CIS cars also have a switch on the throttle body that disables the oxygen sensor input, so that the car can get richer at full throttle. Vdubs. You can go as far out as 3. S system. 0 (or heaven forbid a 2. Jul 29, 2020 · It has a 3 pin connector with 2 sets of switch contacts to control fuel enrichment from idle to just off-idle and at full throttle. -Or, a 5x. #26 Sep 21, 2007. I tried setting mine without the meter and couldn't get it right. The approx. 5T) I think it's time to get my fuel distributor rebuilt or swapped out on my 1973. CIS rich to lean adjustment - 1977 2. Additional Notes: 1. It is a 3mm hex key that can be used for CIS Fuel Injection mixture adjustment on Mercedes. Aug 13, 2023 · This is the complete adjustment for 1980-1983 cars. I told them that this will lead people to think that the purpose of this adjustment screw is air/fuel mixture adjustment. Oct 22, 2013 · The idle mixture adjustment on mine ('79 450SLC) is under a grub screw ontop near the injection system. Note: The following information is for educational use only. Sears Craftsman Digital Multimeter #82139 $29. People underestimate the difference between K- & KE-Jetronic regarding function and, particularly, regarding diagnosis. I wish he would add in his post to verify the absent of air/vacuum leak before attempting to do the adjustment. Test spec per the Workshop Manual is one set of contacts is closed at idle and opens at 2-3° of throttle valve rotation and another set of contacts closes at 30-35° of throttle valve rotation. you will feel clicking or "indexing" when you get the right tool during the turning. com/Tips on how to adjust the fuel mixture on air-cooled Porsche 911s running Bosch CIS K-Jetronic Fuel Inje fuel lines. The pumps and filters are new and the Nov 28, 2016 · Remove the air filter mailbox, leave the IC in place. adjustment would be to turn the hex-key counterclockwise (Lean) until the engine almost Feb 12, 2022 · Location: South of the Mason-Dixon Line. Mar 26, 2016 · CIS Air/fuel adjustment screw Jump to Latest Follow 2K views 3 replies 4 participants last post by Poundy Mar 28, 2016 Sep 8, 2007 · 1,647. 7L. Feb 7, 1977 · Location: Michigan. Welcome to Saabscene, scoony. 5 911T's Bosch CIS fuel injection was performing as it should. 5 mm allen fits perfectly through the hole but will not seat within the 3mm allen head. Follow the instructions on page 3, step 6 of 'KE jetronic mixture adjustment. Image Unavailable, Please Login. From the graph it will be clear that mixtures richer than 13:1 will only succeed in wasting fuel : one part of fuel will burn up 14. And - guess what! - even most professional car mechanics think it is. Correcting the air/fuel mixture is important in order to keep the engine running at it's best. 7:1). The basic function of the Lambda system is to adjust the fuel mixture at or near stoichiometric (air-to-fuel mixture of 14. 09-17-2012, 01:04 AM. If you have fixed other problems, you might be changing other factors that will lean or richer the mixture anyway so it's best to save that for last. Procedure for removing the CIS fuel distributor (1973. = 50% when the meter is set for 6 cylinders. The frequency valve changes the lower chamber pressure inside the fuel distributor which alters the amount of fuel sent out to each injector. Aug 22, 2003 · V. V. Drill 2. Like. 1986 Fuel Systems MERCEDES-BENZ CIS-E ELECTRONIC CONTROL SYSTEM. This regulator sits atop the motor and uses engine heat to adjust the fuel plunger inside the fuel distributor and changes the fuel mixture. Same as Mercedes number 000 589 14 11 00. I have just finished reading the Bosch Fuel Injection & Engine Management by Charles Probst. 8L I've attempted to adjust the fuel mixture via the hex dealy right next to the fuel dizzy. If I'm not mistaken (and I often am) with system pressure, higher pressure equals more fuel; the opposite of the WUR in which lower pressure (on a CIS pressure tester gauge) equals more rich. Use the starter for about 5-10 sec. Jun 19, 2023 · An engine equipped with a Bosch CIS (K-Jetronic) fuel injection system depends on the accuracy of the control pressure for starting and driveability performance. CIS Fuel Mixture Adjustment: Fuel mixture adjustment can be accomplished using a few basic tools: 1. The Porsche 928 continuous injection system is very robust when properly set up. The warm up regulator is actually a fuel pressure regulator and, consequently, this obviously affects mixture on CIS equipped cars. CIS-E mixture control) and the fuel injection control pressure (controlled in part by the EHA servo). Apr 3, 2007 · I have aquired a classic 900 E reg, the fuel/air mixture is not set up correctly, i was wondering if anyone knew how many turns i need to turn the allen (sp) key to correct it? any help is much apprieciated. vbwstripes Discussion Starter Sep 8, 2007 · 24,877. Aug 10, 2005 · Have you checked the warm up regulator? There is an ohms-reading test for this part. We spent some time on an in-ground chassis dynamometer to make sure that our 1973. . These adjustments are intended to be followed by an actual exhaust gas CO check to ensure May 8, 2020 · The very first cars with CIS, like the VW Rabbit/Audi Fox had a very nice rubber plug molded around a metal rod with a ring on the end. For early model cars using the K-jet (mechanical fuel injection The CIS-E engine control unit ("brain") or ECU, adjusts the idle with a device called an idle stabilizer valve according to engine temperature, speed and mixture. Not the other way around. Use the following Link to see the CIS Idle Speed and Idle Mixture Adjustment procedure. Detach air hose at diverter valve and insert a suitable plug. Repeat this process and evaluate the result. And you can end up with ten other mild problems hidden by a slightly rich mixture adjustment, which gives bad fuel economy and smell, and black spark plugs. If the computer senses (via the O2 sensor) that the . Adjust the screws until the idle reaches 900 ( 50 RPM. … :wink_2: Feb 6, 2015 · Please help!!! Followed a stupid BMW mechanic's advise to turn the air/fuel mixture adjustment screw on my 1980 450sl all the way to the limit and then 1. If we add two parts of fuel to 14. Re: need to know how to adjust mk2 1. 2-3) that then climbs gradually to 12. you are to insert a long reach 3mm allen key into the hole between the fuel distributor and the intake boot. 627 posts · Joined 2010. 2. I have a query concerning a very early R129 500SL 119960 engine. Be careful, there will be some fuel pressure at the openings. Oct 12, 2007 · Mike. This new type of injection system, called Motronic, is technologically leaps and bounds above the CIS system in terms of performance and emissions control. If during a system pressure and performance test it is determined that the warm-up regulator is at fault, you are faced with an alternative: replace it (list price now about $280) or attempt to repair it. Then, set it midway in between those two settings. Feb 19, 2010 · 22890 posts · Joined 2006. Be careful to turn each one the same amount. com (503) 843-2700 Apr 14, 2021 · Mercedes Ke Jetronic- CO/mixture screw adjustment(air-fuel ratio adjustment) Sensor plate adjustmentIn this video we are going to talk again about the mechan Dec 7, 2023 · The fuel mixture is set by the Warm Up Regulator (WUR), which alters fuel pressure. Last edited by a moderator: Sep 7, 2017. lol). Raymond. You have to disconnect the ox sensor on the left side sheet metal or the lambda will recorrect everything you try to change. It should get noticeably hot. Now, the car doesn't start and probably flooding the engine as I can smell the gas pretty badly when it cranks. At idle, it'd naturally drop a bit, to reduce fuel, and at WOT, it naturally rises to add more fuel. Remove the two small hex head screws marked "Loosen" in this jpeg -- the microswitch assembly then just pulls off the "D"-shaped shaft (towards the RH side). When I start the engine in my SC, it immediately goes up to about a 1600-1700 rpm idle speed. The relay is located behind the battery. Jun 14, 2006 · There is a pretty bad picture of it on page 240-25 of Bentley. Jul 11, 2010 · The A/F idle mixture will be good @ 2. Adjust in small increments and allow idle to stabilize while observing AFR/CO. Hold the heater unit (the green thing on the metal strip) in your hand, connect the power plug to it, and turn the ignition and pump to ON. Oct 28, 2016 · Very good. Yamaha has an EPA friendly lean setting from the factoryAny mods such as a high flow air filter or Jun 16, 2009 · step 4. Now, turn it back out until engine stumbles or engine speed decreased. Sep 3, 2014. This is the black rectangular box on the side of the fuel distributor controlled electronically. that is the correct location for adjustment of the idle mixture and will also affect the mixture at other levels (but not as much as the vacuum line modification i showed you). Test for unmetered air before attempting to tinker your fuel mixture. One adjusts for idle and low rpm, and the other for higher rpm when the engine is under load. Confirm the absence of sources of unmetered air first, then do the fuel mixture adjustment. We were founded in 2001 by Larry Fletcher. Do not bend the steel type fuel lines. Turn in very small increments--clockwise to richen. Not all CIS cars have one. There are two different mixture adjustments on the MFI system. Mathew, The '74-'75 CIS (911) have a different electrical configuration with those of the '76-'77, '78-'79, and '80-'83 CIS cars. Now, the fuel pressure in the fuel system is zero. Posts: 53,505. since its likely lean due to age, vacuum leaks, ect. And then when one of those other things breaks, it's very hard to troubleshoot. The idle mixture screw is seized on my Volkswagen M Apr 10, 2015 · VW Tech Talk 201: CIS-E Idle speed & CO adjustment. that is why you are turning and not getting any change. SHERIDAN, OR 97378 sales@techtonicstuning. The engine was recently rebuilt with all rubber having been replaced and joints checked for vacuum leaks (non found). Nov 25, 2023 · In 1984, Porsche replaced the ten-year-old Continuous Injection System, or CIS with a new type of computer controlled fuel injection from Bosch AG. 99 (or similiar meter with Duty Cycle setting) The test connection is located near the brake vacuum booster. 7 parts of air, only one part of fuel will burn up and do work, because there is not enough air for the second part of Aug 25, 2013 · Basic Adjustment of Mixture Control Screw after Replacement of Operating Lever. #7 Mar 12, 2016. #4 · May 18, 2010. Per the "101 Projects for your Porsche 911" book I have located the fuel mixture adjustment allen wrench hole (page 96) located between the fuel distributor and the large rubber boot above the engine and behind the airbox. For adjusting CO mixture on CIS cars. The warm up regulator, also called the control pressure regulator is responsible for controlling the A/F ratio at operating rpms and loads above idle. The time now is 07:05 PM. Feb 7, 1975 · The mixture screw is located on the fuel distributor, on top-center in a shallow hole. My question is the difference in setting the basic mixture adjustment without the gas analyzer: the K-Jetronic with Lambda is recommended to use a dwell meter connected to the test connector to a target of 45 to 55% whereas the Motronic is set (again, if no gas analyzer is available) by hooking up a Dec 27, 2020 · And I tried hard. However, the idle speed adjusting screw will sometimes back out causing idle speed to become out of adjustment. Jun 12, 2004 · p. 5L to a 1. May 15, 2002 · Re: CIS Mix Adjustment 101 Needed >>> (need_a_VR6) Your problem is, you're hung up on the idea that the duty cycle is measuring the mixture, it's not, it's measuring how the computer is responding to the mixture. ft cl ek en jb ic va va pr bp