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1998 Mercedes Benz ML320 cyl 1 and sometimes #2 read miss f

Tiny
RRAPP1957
  • MEMBER
  • 1998 MERCEDES BENZ ML320
Engine Performance problem
1998 Mercedes Benz ML320 6 cyl All Wheel Drive Automatic 147k miles

intermittent missfire, car will run fine then hardly run past 40 mph. 147,000 miles, new plugs at 100k, changed fuel filter because fuel pressure read 35psi, now reads 45 psi.
Plug wires? MAF sensor? Fuel pressure? Not sure what to do.
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Wednesday, March 4th, 2009 AT 6:06 PM

2 Replies

Tiny
MHPAUTOS
  • MECHANIC
  • 31,937 POSTS
HI there,

I would be checking for a vacuum leak around No 1 & No 2 cyl, start there.

Mark (mhpautos)
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Wednesday, March 4th, 2009 AT 6:33 PM
Tiny
GFIMOTORCARS
  • MECHANIC
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You may want to consider failed coil packs for these cylinders. If you are getting misfire codes I would hesitate to go after a maf sensor. Coil packs are easy to replace and may very well take care of your misfire.
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Sunday, March 8th, 2009 AT 12:47 PM

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