2002 Mercedes Benz ML320 missfire at #1 cyl

2002 MERCEDES BENZ ML320
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DORELS
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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!
Feb 16, 2009 at 4:23 PM
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MHPAUTOS
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Hi there, is No 1 fuel fouled? you may have a leaky faulty injector, also do a comp test, start here.

mark (mhpautos)
Feb 16, 2009 at 4:36 PM
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DORELS
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I don't think it is the compression. Car it have 67K miles on it.
Feb 17, 2009 at 12:57 AM
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MHPAUTOS
  • ✓Experienced Mechanic
  • 31,937 POSTS
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)
Feb 17, 2009 at 8:11 AM
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