ibanez6rg

Then will fall on it's face. Sometimes I'll get DTC 16, sometimes I won't, I used to get 41, 42. Opti, coil, ICM, O2s are all brand new.

The only thing I haven't changed is going back to the stock coil (using MSD now). I bought a used 95+ wiring harness for the opti, maybe that's it?

Just after it gets warmed up the tach goes all over the place and won't idle and spits and sputters.

PoorMan

Sounds like the ICM

ibanez6rg

I just replaced it yesterday and did the cooling mod.

ChevyIron

Could be possibly a vacuam leak after the motor heats up you get the leak.What do your O2 readings look like?Hope you get it going good luck with it.

slopokrodrigez

Battery, connections or alternator. Check the output of the alternator for the proper DC levels and be sure the AC component is less than .03V.

ibanez6rg

Hmm, maybe. I mean it will run fine with no problems, but then all of the sudden it starts to spit and sputter. Turn it off and won't be able to restart, the engine will just crank over. Go back maybe an hour or two later and it will start up. Depending how long I let it sit, the farther it will go without any problems.

ibanez6rg

Knock also goes up the longer I drive. Will start out at .1 and continue up to 5.

a mean 94z

Sounds like it could be the alternator

ibanez6rg

Battery doesn't lose charge though.

SATANAZ666

Sorry i'm bad with all these abbreviations....but what is the ICM??????????????

ibanez6rg

Ignition Control Module, it sits above the coil.

SATANAZ666

I had that same annoying problem last summer.....It turned out to be a couple of plug wire that were burnt. oh and i cleaned my MAF. and that was that.

does anyone have a pic of the ICM???? how much does that thing cost????????

Pasky

Hmmm perhaps after 15 minutes the car is going into closed loop and then gets its reading from the oxygen sensors and thats why it is so bad, when is the last time you changed the O2's?

wdz_lt1

mine did this exact same thing and i replaced the opti..and waterpump why i did opti...since mine is non vented

cleared it right up

ibanez6rg

I swapped in new O2s, still does the same thing. Hopefully it is not the opti, as it is brand-new, too.