eyez

I have a 03 accord 4cyl.

I have recently had the check engine light come on, giving me a code for misfire in cylinder 1.

Hoping for a realitively easy fix, I went ahead & got 4 new plugs and changed them.

Well, when the engine is cold, it starts & runs fine. After it warms up, I get the code back, while idle at stop lights/signs. While driving, everything seems okay. I switched all the coils around, figuring that if that was the bad culpurit, it would change, but after clearing the codes, and retesting, I am still getting the code for misfire in Cylinder 1.

I've been trying to check the site here, but not seeming to have much luck. Anyone have any suggestions / idea's, besides taking it to a mechanic?

Thanks!!!

timmbo

How many miles on it?

eyez

sorry for the delay, it has 151,000 miles

rockycat

Change the #1 coil to another cylinder and see if the code changes to that cylinder.

eyez

I changed all the coils, and still came up with the #1 misfire.

lazlong

Next step is to swap injectors and see if the mis-fire follows the injector. If it's not the injector then you need to do a compression test, then a leakdown test if there is loss of compression.

eyez

Well, I went to test / swap the injectors, and somehow the wire wasn't plugged in all the way on injector 1.

Not sure how it got that way, but drove it around for 45 minutes, and no misfires, or CEL coming on, so hopefully, that is all it was ... another learning experience.

Thanks for the help!!!