93 LT1 Misfire when cold
Thread Starter
Race Director
Joined: Oct 2011
Posts: 16,089
Likes: 819
From: Dallas Texas
2025 C4 of the Year Finalist - Modified
93 LT1 Misfire when cold
Car has always done it. Let me explain. It starts up fine cold, idles fine. But if I don't let the car warm up for a bit, it will misfire when I put in drive, with foot still on brake pedal. Put it back in Park or Neutral, it goes away. I noticed that if I let it warm up to 103 degrees, it won't misfire. But it doesn't do it when car is above that temp. I have replaced every ignition component in the car. But it's on LTCC now(taking ICM and coil out of the equation), with a new opti. Doesn't really bother me, as the car runs great. But now I'm curious. No MAF, it's speed density.
What are you guys thoughts?
What are you guys thoughts?
Thread Starter
Race Director
Joined: Oct 2011
Posts: 16,089
Likes: 819
From: Dallas Texas
2025 C4 of the Year Finalist - Modified
I hope not, because I put some FIC injectors in it September 2015, even changed the fuel filter before doing so. But you never know. Thanks for the response.
Team Owner
Joined: Sep 2003
Posts: 25,394
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OP - maybe contact a "moderator" and ask that your "TITLE" be edited to add "LTCC" to it. This is an instance where the older SCAN - TUNE section would work well. You can't edit the "title" but I'd think a Moderator would be happy to.
Something like this maybe "'93 LT1 w/LTCC COLD MIS-FIRE"
Something like this maybe "'93 LT1 w/LTCC COLD MIS-FIRE"
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Thread Starter
Race Director
Joined: Oct 2011
Posts: 16,089
Likes: 819
From: Dallas Texas
2025 C4 of the Year Finalist - Modified
I did when it misfired. There was a very small fluctuation. Maybe plus or minus 2 psi. But the miss clears it self pretty quick if I leave it in drive or reverse. Still, I'll give it time to warm up.
Last edited by 1993C4LT1; Jan 6, 2017 at 04:02 PM.