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2003 Chevy S-10 2003 Chevy S-10 Misfire Cylinder 4

Tiny
ESSPIPER
  • MEMBER
  • 2003 CHEVROLET S-10
  • 4 CYL
  • 2WD
  • MANUAL
  • 60,000 MILES
I have a 2003 Chevy S-10 that keeps displaying the service engine soon light. The code is P0304, Misfire, Cylinder 4. I have replaced the coils, wires and plugs, but the problem is still there intermittently. The light will come on for a bit, then go away, and come on later. Where is the next place to look? The engine seems to run fine most of the time, though it is a little rough at low RPMs, or in the initial idle after starting cold.

Thanks in advance
Steve
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Wednesday, July 22nd, 2009 AT 9:10 AM

3 Replies

Tiny
JDL
  • MECHANIC
  • 16,098 POSTS
Hello, how is the fuel pressure, injector? You might do a compression test, see how the cylinders compare? Maybe an intake manifold gasket problem?
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Wednesday, July 22nd, 2009 AT 12:42 PM
Tiny
SWC0671
  • MEMBER
  • 1 POST
I've run into the problem of this misfire on number 3 cylinder. I've changed my plugs, wires, distributer cap and rotor. I've run a can of Sea Foam injector cleaner through the tank and am still getting the same blinking idiot light and bad skip in the motor. I've been told to look at most anything from the mass air flow sensor to the catalytic convertor. For some reason I can't see any of those causing this problem. Any suggestions on this issue?
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Thursday, July 23rd, 2009 AT 6:42 AM
Tiny
JDL
  • MECHANIC
  • 16,098 POSTS
Hello, just about anything can cause a misfire issue, that's why all the suggestions. I'd want to visually see spark on number three, when the problem occurs. The only correct way to check fuel pressure is with a gage. The only way I could track it down, is by testing.
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Thursday, July 23rd, 2009 AT 9:54 AM

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