2002 Honda Civic LX auto - repair & modding

[Chrysler kid]

Intake manifold gasket. Spray some carb cleaner around the engine to see if idle changes.

plugs are recent?

[MetroMPG]

FYI...

Mr Doax is away for the rest of the week, but I know he'll be getting back to this thread when gets back. This Civic is driving him nuts.

[California98Civic]

Clean the electrical ground connections. I had all kinds of haywire sensor and fuel trim activity. It seemed patterned, like you are describing. I considered injectors, MAP, O2, and spark wires... in 30 mins with 210 grit sand paper, a cloth, and a little red grease, I cleaned the engine ground wire connection surfaces and those for the battery ground and the transmission ground plus a little one I found along the way... all problems vanished. I'm still in disbelief.

Given the color of the AT tranny fluid, I'll bet ground have never been cleaned.

Good luck.

james

[Daox]

Just checking in on the road. Thanks for the suggestions guys!

I'll try the carb cleaner trick. I don't think I have a vacuum leak though. Idle is very steady when cold, and when it warms up there is only the slightest hint that its misfiring. When I've had vacuum leaks before the idle is effected a lot more and there has usually been surging. Maybe this isn't always the case though?

The plugs are new with all the work I've done. I've even swapped back to the old plugs and back to the new ones, and moved them around to make sure its not specific ones (did the same with the coil packs).

The grounds have been cleaned as I went through the work I've done. I can double check that though.

Thanks again for the ideas. I'm about out of them myself!

[Xist]

Hey Mr. Doax Sir, ever resolve this?

[Daox]

Not totally. It still misfires, but the car passed emissions so it is good for 2 years now. The real fix will at some point be to remove the head and replace the sticky valves.