hucks1987

Hey guys. So the last few weeks I have been getting misfires on 1&2 but only at a standstill. I have changed the plugs twice. Once with ngk and auto lites. Changed the coils over but for some reason it just won't stop.

Anyone's have an idea

umrdyldo

iTrader: (1)

How many miles are on the car?

Could always be sticky valves. Might try running some Seafoam through the bitch and see if they stop temporarily.

tomj77

iTrader: (2)

how do u see misfire, u get cell or a scangauge?

hucks1987

Both. CEL blinks and scan gauge

tomj77

iTrader: (2)

ah ok, I figured if it was only scangauge then don't worry bout it, try getting a new O2 sensor, that fixed mine when I had them

hucks1987

If it was the o2 sensor would they all be misfiring?

riceburner

iTrader: (66)

hmm i wouldn't think so.

is your car tuned at all or anything? any mods?

hucks1987

Yea full bolts and S20g turbo

Iam Broke

iTrader: (10)

Time for a compression & leakdown test. Could be ringlands. Using much oil lately?

Nfamous60

iTrader: (11)

I have this same issue are you gettin blowby? Or lots of smoke from the valve cover when u remove the oil cap? My 02 sensor isn't plugged n so this could be a cause as well I'm n for answers.

rukkee

iTrader: (3)

How many miles on her? Might be time to pop the intake man off and look at valve build up.

riceburner

iTrader: (66)

U mean valve cover?

vahdyx

iTrader: (7)

This is good info, good thing I have the Powell Oil Separator since 26000 miles, so hopefully it won't be a problem for me.

It is great info to know though, please keep us updated on your progress in fixing this issue. If not us, then just me.

hucks1987

i did copression test, 135,140,155,120. so i dont think its a ringland, i also seafoamed it, it stopped for alitle bit but came back, and also, my cache can is getting alot of oil in it for some reason.

nobody2u

I had a similar problem about a year ago. Cyl 3 would give misfire codes on cold starts sometimes. After many trips to the dealer (they tried the plug and the ignition coil) they eventually replaced the injector for Cyl 3 under powertrain warranty. CEL has yet to come back.

rukkee

iTrader: (3)

Naw..... if he pops the intake manifold he can clean the intake valves by hand . Its a pain in the ass but its worth it IMHO.

I've been using seafoam every 3K miles since it was new and I pulled my intake manifold @ 50K miles and they were actually pretty good .....not great. The build up wasn't nearly as bad as others ive seen..... so the seafoam must be making some difference .

I watch misfires on all cylinders with my dashawk and I rarely see any at all , but have seen 1 or 2 when watching it for 20 miles or so ...... but i think every car has a few from time to time.

umrdyldo

iTrader: (1)

At cold start it is very common to have up to 5 or so.

Once warm you shouldn't see hardly any

BoSStwick

I'm getting more than 30 misfires a minute at standstill right now. They instantly appeared right after I installed my PCM which was freshly tuned from ZZP to remove idle surge. Just cleaned spark plugs and I don't think it's carbon build up.

Iam Broke

iTrader: (10)

You should see 165 at sealevel across the board. I'd do a leakdown test. I think you have ringland issues. 120 is getting pretty close to a dead cyl. especially at idle. I've seen some at 100 that do, some that don't.

Since you are seeing oil I'd bet a pizza on pistons.

09BlueBaltSS

Lightweight flywheel by any chance??

BoSStwick

Yeah the fidanza

09BlueBaltSS

If u have the AC on does it still misfire?

BoSStwick

Yes, I'm am pretty sure it still misfires with the AC, although I can't check right now because it's storming outside and I'm at a different house than where my cobalt is at.