Multiple Misfire Cause? - Mercedes-Benz Forum
 
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#1 (permalink) Old 01-13-2010, 07:38 PM
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Multiple Misfire Cause?

I turned on my car a few days ago, there was a hard start. The car would increase rpm then drop and eventually shut off.

I used the obdII and picked up codes for Misfire in different cylinders and multiple misfire.

Initially, since the weather here in NY has been freezing, I thought maybe water in fuel so I added Water Removal.

That did not work, and changed the spark plugs. I still get the same codes. Any ideas or solutions?

Thanks
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#2 (permalink) Old 01-13-2010, 08:44 PM
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can a poor or malfunctioning fuel pressure regulator cause multiple misfire?? thanks
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#3 (permalink) Old 01-13-2010, 08:48 PM
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Quote:
Originally Posted by brklynrep88 View Post
can a poor or malfunctioning fuel pressure regulator cause multiple misfire?? thanks
Yes it can. But so are hundred other things. What specific codes are you getting?

http://www.benzworld.org/forums/w163...ml#post3329300

1972 280SEL 4.5
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#4 (permalink) Old 01-13-2010, 09:49 PM
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Misfire for each of the Cylinder 1/2/3/4/6 and multiple.random misfire
Each time I read the codes three cylinders would come up in the codes, I took it the reading a few times
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#5 (permalink) Old 01-14-2010, 06:02 AM
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Have you done the fuel filter update yet? Also noticed you did not mention changing the wires. What is your mileage?

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#6 (permalink) Old 01-14-2010, 11:17 AM
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current mileage is 70,000.
fuel filter has been updated, and was changed within the last 6 months
fuel pump also has been changed with last year
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#7 (permalink) Old 01-14-2010, 11:58 AM
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Concentrate on things that affect all cylinders. It is unlikely that all coils/wires went bad overnight.

Fuel pressure? Delivery volume.
Fuel contamination. Diesel in tank.
Large vacuum leak.
Bad MAF.
Stuck open EGR valve.
Plugged up converters.

Do you have means of looking at live data stream?

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