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1994 C180 Intemittant low power. air pressure sensor?

Discussion in 'Engine, Drivetrain, Fuel and Exhaust' started by daveseavista, Jul 15, 2009.

  1. daveseavista

    daveseavista Senior Member

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    Joined:
    Jul 4, 2009
    Location:
    Exeter
    Your Mercedes:
    1999 C200
    Hi
    I have just bought my first MB having suffered years of overheating problems with Vauxhall Senators and MV6 Omegas. I have had the car a week and so far I am very pleased. I have one problem that is puzzling me and I am hoping someone can help.

    Sometimes the car has very little power when pulling away or going up hills. Most of the time it is fine. Pushing the accelerator down makes little difference when it is playing up, the car will pick up speed in its own time and then be fine. My first thoughts were the lambda sensor, I tried a test that worked on the Senator of holding the throttle at 3000 rpm and seeing if the revs were constant with a regular variation pointing to the lambda. The revs stayed at 3000. Looking at the posts on the forum it looked like the MAF was the next area to check but I found a thread on the forum saying the 1994 C180 does not have a MAF but an air pressure sensor. Do these fail and give the above symptons? Can they respond to cleaning with IPA? Is there a way I can test it is working?

    Many thanks in advance Dave
     
  2. OP
    daveseavista

    daveseavista Senior Member

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    Joined:
    Jul 4, 2009
    Location:
    Exeter
    Your Mercedes:
    1999 C200
    Hi
    I have done some further checking and hope the following may help pinpoint the problem.

    I have changed the air cleaner, spark plugs and sealed a gap in the air duct. This if anything appears to have made the problem worse? The problem is worse when the engine is cold. is does not start immediately and normal need some throttle, once it has started it runs a bit lumpy with slight hunting. Pulling away there is almost no power and pushing the throttle down has little effect in fact it drives better with no or little throttle. Once it has warmed up it is a lot better but I still think it lacks power.

    I cleaned the air pressure sensor with spray IPA but it had no effect, I removed it from the air duct and it had no effect good or bad.

    I hope this helps?

    Dave
     
  3. edthebad

    edthebad New Registration

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    Joined:
    Aug 13, 2009
    Location:
    uk
    Your Mercedes:
    1995 C180
    Did you get to the bottom of it. I think I may have the same problem, though not quite as bad as yours.....yet!
     
  4. Dec

    Dec Senior Member

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    Joined:
    Nov 30, 2005
    Location:
    Ireland.
    Your Mercedes:
    W202
  5. OP
    daveseavista

    daveseavista Senior Member

    Messages:
    47
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    Joined:
    Jul 4, 2009
    Location:
    Exeter
    Your Mercedes:
    1999 C200
    Sorry for the late reply. The problem was the air temperature sensor. I got it from GSF car parts about £20.00. It is located in the rear of the inlet air duct.

    All the best Dave
     

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