Ah great now I am building a weak compression chamber. Boom!!! See ya'll on the other side.Originally Posted by Pranav
Ah great now I am building a weak compression chamber. Boom!!! See ya'll on the other side.
Sean reminded me we had a similar issue at Houston in January. Before we started swinging parts we borrowed Casey's laptop and his scanning software. We found that the PCM engine temp signal was sketchy - you could wiggle it and see it drop out. I think we changed pigtail and sender.
#39 CMC Camaro
Orange is Fast!
CMC-NT01 FTW!
Yep. That's what we did. Computer was jumping back and forth between open loop and closed loop because the
temp it was seeing was jumping between -40F and ~210F which really messed with the timing. Turned out to
be a damaged wire a couple inches from the factory connector. The insulation had been cut and the wire was
all corroded about an inch in each direction. Eventually the wire had broken inside the insulation.
--
------__o
-----_\ <,_
----(_)/ (_)
Laissez les bons temps rouler
Was hoping to be able to hook it up today but nice, waiting the cable. Should know being in Wednesday or Thursday, will know more then.
Are you using all OEM ignition components? Any aftermarket bits are garbage. ICMs especially, Blow Reilly's will sell you the same POS for a 93-97 LT1 and GM spec'd 3 different ICMs: 93, 94-95, 96-97. They all have different curves and none of them match the aftermarket stuff from what I've read. Now an ICM is more of an item that either works or it doesn't, so doubtful it's the smoking gun for this but I am inclined to leaning toward wiring or electrical/engine management if the compression is solid. We had an LT1 here that also had a bad pigtail for the coil so the car would just randomly die and gave no indication on the scanner WTF was going on.
RM CMC Director
ICM issues are what led to us doing the LS1 swap. I never figured out why but the car was eating them every two sessions. The ACDelco ones would last longer. They all exhibit the same symptoms though, I would loose ignition for a few seconds once, then about 10-30 minutes of track time later it would go out completely. It was a contributing factor to the grass fire at TWS (along with leaking oil and my stupidity of putting in the grass). The last time it happened the car back fired horribly, ringing ears and all. Did it again when I tried to fire it at the shop.
I wanted to try this kit, but adjustable timing is against the rules.
https://www.jegs.com/i/MSD-Ignition/121/83811K/10002/-1
I just now found the piece parts I *think* you need to eliminate the ICM by itself. Not sure on the rules status of it but in the spirit of the CMC rules I'm going with illegal. If I had found them earlier maybe I would have tried them out.
Pig-tail
https://www.jegs.com/i/MSD-Ignition/121/8876/10002/-1
Digital ignition
https://www.jegs.com/i/MSD-Ignition/121/6425/10002/-1
- Josh
CMC #50
I wonder if this and and good clean Opti is all that's needed to make an lt1 run right?
ICMs gave me some trouble too early on.
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