Intermittent Misfire - NO CEL

HarryD

Member
 Oregon
I have had a intermittent misfire on cylinder 5 for as long as I have had the car (2003 3.0i). Fortunately, it does not turn on the Check Engine Light. When I clear it, it will not return for a day or two.

I replaced my coil packs and plugs a while back since I did not know if/when it was ever done before (the car had over 130,000 miles) and it did not resolve it.

This weekend, I decided to swap the #4 and 5 injectors to see if the problem was related to a failing injector. Since then, I have started it several times with no codes. I think the problem may have been a poor electrical connection that was addressed when I pulled and reinstalled the power connections.

Fingers crossed, the problem is behind me.
 
Always a good idea to clean electrical connections with contact cleaner then dab a bit of dialectric grease at the ends of wires/cables but not on connector pins.
I usually use Kontakt PRF 7-78 as it leaves a protective film on connectors without inhibiting conductivity.
 
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