Slight misfire - but not throwing a CEL
 

Hi Guys, I've read thru the misfire threads here which are extremely helpful. Mines a MY04 with just 60K miles on it. But only 6K miles in the past 7yrs so its been sitting in the garage a lot!

It's running good & idling appx 900rpm, but not as smooth as I think it should. At idle get a slight "skip" every 30 secs or so. When pulling hard under acceleration, it also occasionally misses 1 or 2 times, slight but noticeable to me. So far I am not getting any CEL. My OBD scan with Blue Driver shows no codes or pending codes. I did a TB cleaning and also cleaned and oiled my K&N filter first - no improvement.

Next I'm going to start with the likely suspects spark & fuel. The Denso plugs have been in 7 years but only have 6K miles, I'm going to pull those out first to take a peek and run a compression test. Will probably switch back to NGK's. Not sure how to test the coils.

I will also pull the injectors and have them tested & cleaned at RC Injector. Fuel pressure, filter, bad gas etc I will also look at. Any other likely suspects I should look at? Thanks a ton in advance.

Thanks Billman! Do you have a recommended procedure for testing the coil packs?

What would you say is the average lifespan of a set of coilpacks?

I recently discovered some oil on the coilpack of cylinder 4 (car threw a misfire cylinder 4 code). So obviously, I would have to replace the spark plug seals. Should I replace the coil packs too while I'm at it?

Year 2000, 130,000miles, car is in good mechanical shape otherwise.

100-125k'ish is the minimum time I've gotten on my Accord and S2000, separately, before one coil pack started to fail. But definitely a failure before 200k miles, at least in my experience.

And +1 for BIllman, I had a phantom coil pack on my AP1 which had similar symptoms as yours (and no CEL).

AP2 packs are compatible with AP1? Are the AP2 packs revised in anyway?

Thanks!

Do you have the part number(s) for the coil packs? AP1 or 2004-2005 AP2 will do, thanks!