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  #1  
Old 06-01-2005, 10:04 PM
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Location: New Zealand
Posts: 160
c200 hesitation

Hey guys,

After suffering from some problems with my 95 c200 ive replaced 2000 dollars of parts to no avail.

When the car is cold, it smells really rich, black plugs as in rich mixture and when pulling away it will hesitate. It will drop revs go like its going to cut out, then if you take your foot off the accelerator it will pick up. Putting your foot down further seems to flood it and stall. This is a result of a wiring harness going bad.

Have replaced

wiring harness
idle speed actuator (throttle body)
engine temp sensor
air temp sensor


Still got the problem! Also when reading from pin four of the diag plug I get four pulses, i think this is to do with MAF over upper limit???

Have also swapped out the MAF, makes no difference. Have also tried another OVP! Nothing!

HELP!

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  #2  
Old 06-01-2005, 10:10 PM
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Location: Florida / N.H.
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Check the fuel pressure regulator.
Do a fuel pressure test.
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  #3  
Old 06-01-2005, 10:15 PM
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..

Where abouts is the fuel regulator on these? Im only familiar with the setup used on the old 190e's. Does anyone have the specs for pressure etc?
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  #4  
Old 06-01-2005, 10:25 PM
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I don't have any specs on that engine . Only US ..
.. but if it has a fuel rail , [ EFI] it would be up front with a vac hose connected to it.. if so, pull the hose and see if there is any fuel evident. Should not be any.. if there is, it has a ruptures diaphragm and is allowing pressure over spec., which will cause the rich running and limit codes.
Is that a RHD car???
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  #5  
Old 06-01-2005, 10:32 PM
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.

yea its a rhd ex japan model
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  #6  
Old 06-01-2005, 10:36 PM
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Is it EFI 4 cyl. with coils over two plugs?
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  #7  
Old 06-01-2005, 10:39 PM
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yep

Its EFI - HFM sequential fuel injection.

The coils are under the intake manifold however.
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  #8  
Old 06-01-2005, 10:43 PM
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then it has a fuel pressure regulator..

Do a quick check for any vac leaks as well..although I suspect high fuel pressure.

Is that a 38 pin diagnostic connector??
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  #9  
Old 06-01-2005, 10:59 PM
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round

yes its the 38 pin round one.
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  #10  
Old 06-01-2005, 11:15 PM
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Location: Florida / N.H.
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A comparable system US version would have FP of 3.2-3.6 bar at idle,closed throttle with vac attached...3.7-4.2 with vac line disconnected.
that will get you started.
I have no idea what Japan uses for engine management mandates for specs or codes/emmisions..
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  #11  
Old 06-06-2005, 12:06 AM
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fine

Fuel pressure is fiine. Compared it with another c200 of the same year that has no issues.

Tried a new set of plugs too.

Something that might be related. The throttle acutuator hums with the ignition on (engine off) continually - but in a e230 it only hum sfor a few seconds... Related?
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  #12  
Old 06-06-2005, 12:12 AM
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o yea

Not to forget the surging idle. it only surges when in gear.
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  #13  
Old 06-08-2005, 04:12 PM
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update

Heres an update.

Got the dealer to check the fuel pressure for me - its ok.
Dealer re - read the codes and got lambda above upper limit and mass air above upper limmit.

Have got o2 sensor on order, however i swapped a mass air metter out of another car which is fine, and the error kept reccurring. Why?

Also I tested the 02 sensor and i get 0 volts cold. and it lazes around .6 .5 volts..... no fluctuation on rev increase - guessing its stuffed?

cheers

josh
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  #14  
Old 06-16-2005, 10:07 PM
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....

O2 sensor replaced.....now back to the dealer. Know were getting a voltage drop at the ECU - Replaced OVP no change any ideas?

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