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Check engine light blinks

Tiny
JUSTFURMS57
  • MEMBER
  • 2000 CHEVROLET IMPALA
Six cylinder front wheel drive automatic 163,000 miles.

I am desperate for help. A few months ago my car's check engine light came on and it was blinking. First thing I had done was the plugs and wires changed. Solved the problem for about a week. Then it came on again and blink. I went to AutoZone and had them plug in their sensor and they said it was reading that cylinder number five was misfiring. So I replaced the coil. Fixed it for about a week. Blinking again, so I put in some fuel injector cleaner. Did nothing. Now I am noticing that the check engine light will sometimes stay on and then start blinking again. I am also starting to smell a weird smell also while my car is running. And I also notice that it feels like the car is revving up at odd times while I am driving. I am completely at a loss. I do not know what else to do.
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Friday, July 17th, 2009 AT 12:54 AM

5 Replies

Tiny
PEAR69
  • MECHANIC
  • 1,482 POSTS
Is the code still a misfire condition? Have it scanned again and let me know what the actual code is. I need the actual letter and number of the code.
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Friday, July 17th, 2009 AT 1:01 AM
Tiny
JUSTFURMS57
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  • 3 POSTS
The code is still a misfire code. It is P0305. The guy at AutoZone said that it looked like it was trying to correct itself.
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Tuesday, July 21st, 2009 AT 1:59 PM
Tiny
PEAR69
  • MECHANIC
  • 1,482 POSTS
Does the engine run rough? Can you feel the misfire?
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Tuesday, July 21st, 2009 AT 10:25 PM
Tiny
JUSTFURMS57
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  • 3 POSTS
You can hear the misfire. I would not say that the car rides rough, but you can hear the misfire very clearly.
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Wednesday, July 22nd, 2009 AT 2:09 PM
Tiny
PEAR69
  • MECHANIC
  • 1,482 POSTS
What brand of plugs and wires did you install? Remove number five plug and one other plug (lets say number three). Compare the two. Tell me what they look like and if they look different. Look close and use a magnifying glass if necessary. Then install number three in number five and, number five in number three (flip flop them) see if the condition changes. If it stays the same, do a compression test on all of the cylinders. Let me know your findings.

Misfires are (at times) very hard to find. Inspect every ground wire that connects to the engine. Especially the ground that grounds the coil and ignition module. Clean up the ground that connects the negative cable on the battery.
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Wednesday, July 22nd, 2009 AT 4:49 PM

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