Question about 1988 Mercedes-Benz 300

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Using a meter how do I adjust air flow on 1988 300 ce mercedes

Most all components checked and or replaced I need to adjust the air flow using a meter and the adjusting hole in the top of the air filter outer housing thru the hole placed there to allow adjusting during low idle I have done this many years ago I had to buy a long adjusting rod type tool and hook my meter some where , I forget where and forget the reading I was to adjust it to , I think it was between 4 and 8 ohms

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You are not actually adjusting the air flow, just the fuel distributor's response to air flow. This video walks you through how to do that: Duty cycle measurement on Mercedes W124 diagnostic socket faulty control...

Posted on Dec 15, 2014


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SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi there,
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SOURCE: 1990 mercedes 190e wont start, new battery, new fuel filter help

i see, we ask for help and you want to charge us for it. But if we have solved the problem, you want us to tell you how we did it. Well my time is valuable too, i figure it took me about three hours to figure out the problem and fix it, at my hourly rate of $100 an hour, yes i am a business executive that works on his own cars, it will cost you $300 for the answer.

Posted on Jan 03, 2009

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SOURCE: mercedes benz 190e 1900year /air flow meter connections

Guys i just bought my first car and its a Mercedes 190E 1.8L 1991. Now i noticed an digital meter just above my steering wheel with 2 knobs on each end. I dont know what is it for can u tell me plzz. Thanks :>

Posted on Jul 13, 2009

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SOURCE: cold start/fast idle problem 190e petrol

Try online for a used unit or or to get parts.

Posted on Jul 21, 2009

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SOURCE: windscreen wiper on Mercedes C200 not working

you should check the connection to the main board and the connections to the motor for the wipers. these sometimes become gunked up, so when you pull them apart to check them clean them with sand paper or something that can scrub them like a green scratch pad

Posted on Dec 24, 2009

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SOURCE: what size or type tool use to remove cover of oil

no you don't have to remove the oil filter housing. Mercedes Benz has a tool that fits right over the oil filter cap that is inexpensive or you can just use a oil filter wrench. On the in-line 6 cylinder motor its a little harder to fit a filter wrench back there so a claw type filter wrench might be easier to use.The Mercedes filter tool can be found online also.

Posted on Sep 28, 2010

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I have a 1987 260E Mercedes Benz when it is cold outside she has a hard time starting. It is almost like the gas is not flowing through then after a few times of trying to start it she will start. Is it...

The fuel systems on these cars are somewhat complex, so it is difficult to give you an accurate diagnosis in one shot. Here are some things to check, and I am of course assuming you have some basic tool skills and troubleshooting ability.
1) Cold-start injector. This is the injector that fires directly into the intake manifold to richen the mixture when the engine is cold. You need to verify that this is firing when the car is started cold.
2) Coolant temperature sensor(s). Your car has either a 2 or 4 wire coolant temp sensor located near the top rear of the engine next to the valve cover. It needs to be tested with a multimeter to verify that the resistance is appropriate for the temperature. It is an NTC sensor (negative temperature coefficient) meaning that as temperature rises, resistance decreases and vice-versa. If this sensor is bad, the computer will not supply the appropriate fuel/air mixture.
3) Air meter plate binding or out of adjustment. The air meter plate lies beneath your air filter. It needs to move freely and not bind, and needs to be perfectly centered in the air meter bowl bore. Adjusting this requires access to specifications, so do not attempt to adjust this without doing some homework.
4) Fuel delivery issues. There are a variety of components that can cause fuel starvation at startup. A nearly clogged filter, a bad fuel accumulator (which maintains fuel pressure after shut-off), a tired fuel pump can all make starting difficult. Troubleshooting this without simply throwing money at parts requires access to a fuel pressure tester. If the car runs well all the time except for startup, then you can probably rule these out, though fuel filters are regular maintenance items that need to be replaced, and fuel accumulators and pumps do eventually fail.

Start with the cold-start injector and temp sensor. Good luck.

Feb 15, 2011 | 1987 Mercedes-Benz 300-Class

1 Answer

I recently purchased a C200 Merc with 162 000 Km. On two ocassions the car lost power and began to idle roughly. It would not accelerate at all and barely moved. A few moments later everthing went back to...

most possibly it could be the air mass sensor ( air flow meter) first check air flow meter, if you get in to the workshop and fixed the diagnose cpu you can see the fault code, if not the air flow meter next have to check crank angle sensor, if you check the fault code you can see what's wrong, if the fault code like mixtcher information retch or Lin replace air flow meter,

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Sep 17, 2010 | 1998 Mercedes-Benz C-Class

1 Answer

OBDii code reads 0170 which is a fuel trim malfunction right bank 1998 mercedes c230 where would the MAFsencor be and how do I fix

The MAF Sensor (Mass Air Flow) is located in the air induction system between the air filter and the throttle body.

Be certain to inspect very well for any air or vacuum leaks in the air induction system or for any loose hose clamps or fasteners in the air induction system, especially between the MAF Sensor and the throttle body. There can be no un-metered air entering the engine or the engine performance will be effected and the check engine light, or MIL (Malfunction Indicator Light) will come on, and P0170 is only one DTC (Data Trouble Code) that un-metered air can cause.

Also, be certain to check for any obstuctions on the air velocity grid to the MAF Sensor, or in the air flow to the MAF Sensor such as a plugged up air filter, or something sucked up into the air intake for the air cleaner assembly.

The MAF Sensor can be removed from the MAF housing and cleaned using carburetor cleaner in a spray can to clean off the fine dust that often builds up on the air velocity sensor part of the MAF Sensor and causes poor performance from the MAF Sensor. (it will require a tamper resistant torx bit, and note the position that the MAF Sensor is positioned in the MAF housing so that it is installed back into the MAF housing properly)

Then clean off the MAF Sensor with the carburetor spray. (From a spray can only, and do not submerge the MAF sensor in any type of water, cleaner, or solvent, or the MAF Sensor will be damaged)

If cleaning the MAF Sensor does not solve the problem, then replace the MAF Sensor and be sure to install it with the air velocity grid facing the air filter, and be sure to tighten all the hose clamps or fasteners well.

Here are a few links to MAF Sensors for that vehicle, and an image to help assist you.

Replacement MAF- $23.27

Bosch MAF- $134.95

Beck Arnley MAF- $295.60


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May 18, 2010 | 1998 Mercedes-Benz C-Class

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Mercedes Benz C-class 180C, the car stops engine each time I break, I have removed the switch connection to the air flow meter and this stops, what is the implication of removing the switch and driving car...

don't drive the car without air flow meter connected because the air flow meter signal very impotent for fuel mixture in combustion chamber, in your car faulty air flow meter replace air flow meter, is this information helped you?

Mar 24, 2010 | 1998 Mercedes-Benz C-Class

1 Answer

Mercedes Benz C-class 180C, the car stops engine each time I break, I have removed the switch connection to the air flow meter and this stops, what is the implication of removing the switch and driving car...

Mercedes Benz C-class 180C, the car stops engine each time I break, I have removed the switch connection to the air flow meter and this stops, what is the implication of removing the switch and driving car without an air flow meter?

Dec 02, 2009 | 1993 Mercedes-Benz 190

1 Answer

Repair air flow meter

jjj8000: Your car uses what is called a "Hot wire air mass sensor"
This cylindrical black plastic component which has screens at both ends and an electrical connector with roughly 6 pins, is not a serviceable component. It has a set of wires inside of it which after the engine is shut off, gets to a temp over 1,000 degrees Fahrenheit to burn off residue collected on it during the time air has been passing over it. If I could repair this type of component in my shop, I would stand to make a lot of money! Unfortunately, it takes specialized testing equipment for the remanufacturing process. Not to mention the replacement components to put in to replace the ones needed to rebuild the cores.
I wish I could give you a better answer, but it's the only one I know. However, prior to condemning the air flow meter, make sure you have made the proper diagnosis. FALSE AIR problems are often diagnosed as air flow meters. Check and make sure the boots (hoses) which the attach the the air flow meter and go to the throttle body, have no tears or leaks. Make sure you have no split vacuum lines or hoses. Remember, the ECM determines the injector pulse width by the amount of air metered through that component. If any un-metered air that passes after the air flow meter, will create a situation of hesitation and stumbling, lean conditions and more. DO YOU HOMEWORK!"
I'm the new guy on the block here at "Fixya" and need all the feedback possible to get better ratings. If I have helped you, please write in. Thanks......mybunkey

Jan 13, 2009 | 1988 Nissan 300ZX

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