Mechanics

MISSFIRE AT #1 CYL

2002 Mercedes Benz ML320

Engine Performance problem
2002 Mercedes Benz ML320 6 cyl Four Wheel Drive Automatic

Missfire code at # 1 cyl after replaced all the plugs and wires, Coil at #1 cyl, MAf sensor, check fuel pressure-OK. Running rough under load. Please help!
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Dorels
February 17, 2009.




Hi there, is No 1 fuel fouled? You may have a leaky faulty injector, also do a comp test, start here.

Mark (mhpautos)

Mhpautos
Feb 17, 2009.
I don't think it is the compression. Car it have 67K miles on it.

Tiny
Dorels
Feb 17, 2009.
Hi there,

If you have a miss fire in one cylinder only it will be either compression, spark fuel or vacuum leak, there is one thing I have learned in over 35 years in this business, that is you never presume anything is OK, do the basic checks first, this often saves a lot of time and money.

Mark (mhpautos)
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Mhpautos
Feb 17, 2009.

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