Just wondering if there is an easy way to tell if a coil is bad or not. My truck seems to be idling a little rough and just wanted to know if there is a quick check to see if it works or not?

It could just be me but just thought i'd ask.

 

if you had a real misfire from a coil or fuel injector the misfire monitor would 1st start to flash the service engine soon light, after it would flash it would then stay light causing a stored code in the eec system.. if this is ther case have the codes read to id the clyinder then determin the cause

 

Ok, I figured but wasn't sure. Mine is not doing any of that. It seems to idle a little rough but it may be nothing. Thanks for the help.

 

Some seafoam or other quality fuel treatment might do the trick.


Ian

 

I've replaced 2 coil packs on my truck, and the check engine light didn't go on for either of them.

 

How did you know they were bad?

 

I'll be honest, I didn't. All I knew was that my truck was idling rough and riding rough around 60 mph. It was under warranty, so I brought it back to the dealer and they told me. truck runs great now.

 

I've had the similar problem the check engine light flash several time then go out ? is did the eec correct the problem .

 

No, the light turns off after an hour or so of driving IF the problem did not happen again.

Ian