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My 3&4 cylinder arent firing why could this.

Tiny
DRIFTKILLER101
  • MEMBER
  • 1995 MITSUBISHI ECLIPSE
  • 195,500 MILES
My 3&4 cylinder arent firing why could this be ive already replaced the coil pack, spark plugs, spark plug wires, fuel pump, I just seem to cant figure out what could be causeing this
Monday, November 12th, 2012 AT 8:56 PM

3 Replies

Tiny
KHLOW2008
  • MECHANIC
  • 41,814 POSTS
Check the engine compression.
Check for vacuum leakages.
Do you have coolant losses and overheating issues?
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Tuesday, November 13th, 2012 AT 3:30 PM
Tiny
DRIFTKILLER101
  • MEMBER
  • 82 POSTS
All good except it has a low compression on the 4th cylinder, I was guessin that the injectors are clogged or just the ecu isnt telling them to spray
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Friday, November 16th, 2012 AT 12:12 AM
Tiny
KHLOW2008
  • MECHANIC
  • 41,814 POSTS
Low compression can result in misfiring. How much lower than others?

Guessing can be a waste of time and money. Test them to confirm. Try swapping the injectors.
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Friday, November 16th, 2012 AT 11:30 AM

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