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2003 Volvo S40 runs rough

Tiny
RUIZLIDOS
  • MEMBER
  • 2003 VOLVO S40
Engine Performance problem
2003 Volvo S40 4 cyl Front Wheel Drive

the car was running a little rough when we bought it(used of course). Replaced timing belt, water pump, plugs, and intake manifold gasket. Ran great for about a month then started getting a really bad miss. Checked the plugs and two of them had shattered along the porcelain. Is this due to bad coil packs?
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Tuesday, January 27th, 2009 AT 9:19 PM

1 Reply

Tiny
DOCFIXIT
  • MECHANIC
  • 18,828 POSTS
Sounds more like detonation ie. Spark knock. Is a check engine light on? Maybe high combustion temps. Check EGR operation if not opening temps will rise. Also are there black spots on porcelian?
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Thursday, January 29th, 2009 AT 9:31 AM

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