1985 LT1 not running right
Thread Starter
6th Gear
Joined: Oct 2011
Posts: 6
Likes: 0
1985 LT1 not running right
Hi, I have a 1985 LT1 that runs great as long as you are getting on the throttle hard but skips, runs very rich, and sometimes wont idle correctly when sitting in park. Other times it runs fine all the time but then when it takes a notion to it starts acting up again. Any ideas? Thanks in advance.
Pro
Joined: Jun 2011
Posts: 732
Likes: 0
From: Jacksonville, FL
could be the mass air flow sensor or the power relays to it. Pretty sure the 1985 had unique relays for them, it has been a while since i had an 85 so hopefully someone with more knowledge of that will comment.
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Le Mans Master
Joined: Sep 2005
Posts: 6,551
Likes: 36
From: Jenks OK
Before going too wild with replacing parts around the MAF (They get expensive on the '85) I'd check and make sure you don't have a vacuum leak and that your injectors are reading good. More importantly though, check your fuel pressure, see if it leaks down quickly after you turn off the car.
I have a leaky cold start injector that causes it to run rich occasionally and demonstrates similar issues when my car is cold. Once it warms up and goes into closed loop it runs like a champ.
I have a leaky cold start injector that causes it to run rich occasionally and demonstrates similar issues when my car is cold. Once it warms up and goes into closed loop it runs like a champ.
Le Mans Master
Joined: May 2004
Posts: 5,866
Likes: 60
From: Hellinois
Finalist 2020 C4 of the Year - Modified
The '85 has a burnoff module which is VERY pricy if it is bad. The factory service manual has a procedure to check the burnoff module.
Safety Car
Joined: Nov 2008
Posts: 4,328
Likes: 15
From: Jacksonville FL
As suggested, do this free stuff first to get a better idea what is going on.
always do all the free stuff first!
