pd0019

I am kind of stuck here. My car has had a misfire, p0301 302 303, for a while (1-2 weeks) and I finally got the time to diagnose. I have noticed it only at idle. Spark plugs are new (8k miles OEM), checked all the coil packs and they are working properly, and did a compression test with good results (170,170, 165,165). So after checking these, I decided to do a valve adjustment which I did 8k miles ago. Some valves were a little bit loose, so i put them back to spec and started it up. Car now has a more noticeable misfire and also p0410 (air pump malfunction).

anyone have any ideas?

S2_4SHOOR

p0410 is pretty common, replace the air pump and the air pump relay. (The air pump relay (contactor assembly) sticks
intermittently, causing the air pump (secondary air injection) to overheat.)

Is your car stock?

what gauge did you use to do intake/exhaust adjustment? and what order did you adjust? I don't know how handy you are, so I'm just starting from the ground up. 1,3,4,2 @ 180degree?

pd0019

^ thanks for the reply

all i have on my car engine wise is a K&N FIPK. I just find it odd that I had no issues with the air valve and after doing a valve adjustment this CEL comes on. Is there something I may have pinched or something like that while doing the valve adjustment?

as for the valve adjustment, i used .008" intake and .010" exhaust feeler guages. I used "go no-go" feelers so I doubt they are off by much at all. I made sure my engine was cold first then set my car to TDC and turned the crank clockwise 180degrees following the firing order 1, 3, 4, 2. I doubt that I messed up on this as I have done a lot of valve adjustments to many Honda's but I will recheck my work tomorrow.

Billman250

Are you sure its not P0411?

S2_4SHOOR

• P0410 (air pump circuit malfunction)
• P0411 (secondary air injection system incorrect flow)
These are same symtoms for bad air pump and the air pump relay.

S2_4SHOOR

I like to believe that p0410 just happen to come on at bad time.
I never used go-no-go feelers so I can't put any inputs. I JUST did mine tonight also (V.A) I used .227mm and .279mm

The feelers you used is very close to min. spec. I chose mid point feelers for Intake and Exhaust instead of minimal or max. Do you know what I mean? This way if I'm slightly off, I would still remain in specs. But with your feelers, you could be slightly off. Not saying you didn't do right but it's possibility.
You stated you checked coils and they were good. How did you check them? Just curious

hmmm time to pull out a book

Billman250

I was asking the OP if he possibly posted the wrong code. He had no symptoms for anything related to either code. P0411 is most common. I know what both mean...

S2_4SHOOR

I was asking the OP if he possibly posted the wrong code. He had no symptoms for anything related to either code. P0411 is most common. I know what both mean...
[/quote]

I know P0411 is most common, and I also know he didn't post any symptoms related to either code. But I'm assuming he have the right code since he sounded like pretty handy person.

pd0019

sorry for no replies guys...i have been studying for the GRE for the last two weeks and have been avoiding my computer for the most part. i checked my coils by pulling one out and seeing if the car ran the same; running the same would mean the coil is bad, if my car got worse then the coil is ok. I also tried with a new set of coils with no luck. I have also checked my valve clearence again and it seems ok. I did a valve adjustment on my car with the same feelers ~12k miles ago and had no problems since.

As far as the codes go, it was definitely p0410. I have since reset my CEL and neg terminal and have not had that code return. I still have the CEL p0301, 0302, 0304, 1399. I have since also checked the injectors and swapped out coils with new ones and still have the misfire. I have ran injector cleaner through my system as well with no luck.

One thing I forgot to mention is that this all happened relatively soon after installing a new catalytic converter on my car. i was having p0420 with no misfire codes, installed an OEM cat and then got these codes soon after. I no longer have p0420.

so things i have done to address the misfire
valve adjustment, spark plugs have 8k miles on them, comp test, checked the pcv, coils, injectors, ran an injector cleaner, did a "ecu learn"

pd0019

so after reading on the forums...it appears, although my compression numbers are relatively the same, that my numbers are low. i got 160-170, but it seems that the norm is around 210.

cause for concern?