This car has an intermittent misfire

Tiny
MECHANICANMAN
  • MEMBER
  • 2003 NISSAN ALTIMA
  • 65,000 MILES
This car has an intermittent misfire. When I checked the code it was cyl #1. I moved the spark plug to cyl #2 and the coil to cyl #3. Reset light and drove car for two days. Now cyl #4 has the intermittent misfire! Also the light blinks on and off when driving but the light goes out at traffic lights!(Still misfiring at idle though) any ideas? The spark plugs look great and are the correct type ngk part # for the engine. Thank you in advance. Gary
Saturday, October 27th, 2012 AT 3:32 PM

4 Replies

Tiny
KHLOW2008
  • MECHANIC
  • 41,814 POSTS
Check the wireharness and connections at the coil packs. Working around the area could have caused poor contacts of connectors causing the intermittent misfiring.
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Saturday, October 27th, 2012 AT 3:58 PM
Tiny
MECHANICANMAN
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  • 2 POSTS
As I stated thr car had this problem long before I touched the coil packs. They are plugged in correctly and all the contacts are in their proper place. Any technical update to this problem would be appreciated.
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Saturday, October 27th, 2012 AT 11:05 PM
Tiny
KHLOW2008
  • MECHANIC
  • 41,814 POSTS
You hade a misfire on cylinder # 1 before you worked on it. Now the misfire is in cylinder # 4 which means a different problem from previous as stated.
Coil packs, fuel injectors, air intake vacuum leaks, clogged exhaust, fuel pressure, MAF and O2 sensors are possible causes of engine misfires.
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Sunday, October 28th, 2012 AT 7:44 AM
Tiny
RIVERMIKERAT
  • MECHANIC
  • 6,110 POSTS
Also check for condensation and corrosion in the connectors.
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Wednesday, October 31st, 2012 AT 11:31 PM

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