Stuttering when hot: Help!
Thread Starter
Le Mans Master
Joined: May 2003
Posts: 5,362
Likes: 3
From: Delray Beach FL
Stuttering when hot: Help!
Last night on the way to look at another car (as a second car), my 93 stumbled a LOT when I hit the gas (50% + throttle). Temp at the time was 244 degrees. I let my Vette cool down and it seemed to run better. This morning, it was doing it again at just over 200 degrees. Only change made recently to the car was fueling up with 89 octane. I know it was stupid to do, but I thought I would give it a try. Do you think that is why I am stumbling? Thanks in advance.
:cheers:
:cheers:
Race Director
Joined: May 2001
Posts: 14,165
Likes: 9
Re: Stuttering when hot: Help! (Whitvette)
You might pull your hypertech chip and see if it runs any better. Those chips are notorious for advancing the crap out of your timing, and they suggest that you use a 160 thermostat. If your car was running that hot with a lot of timing advance it could very well be your problem.
Thread Starter
Le Mans Master
Joined: May 2003
Posts: 5,362
Likes: 3
From: Delray Beach FL
Re: Stuttering when hot: Help! (Nathan Plemons)
I have not had a problem with the Hypertech chip with the 160 degree thermostat, but I will definitely give that a try. Thanks!!
Race Director
Joined: May 2001
Posts: 14,165
Likes: 9
Re: Stuttering when hot: Help! (Whitvette)
The hotter temps and the advanced timing could easily cause pre-igniton. Pulling the hypertech is a quick and easy way to see if it's your problems.
BTW, do you have a 160 thermo? They hypertech chip should be programmed to take advantage of it and turn the fans on sooner. Guess I'm just trying to figure out how it reached 244 degrees.
BTW, do you have a 160 thermo? They hypertech chip should be programmed to take advantage of it and turn the fans on sooner. Guess I'm just trying to figure out how it reached 244 degrees.
Thread Starter
Le Mans Master
Joined: May 2003
Posts: 5,362
Likes: 3
From: Delray Beach FL
Re: Stuttering when hot: Help! (Nathan Plemons)
BTW, do you have a 160 thermo? They hypertech chip should be programmed to take advantage of it and turn the fans on sooner. Guess I'm just trying to figure out how it reached 244 degrees.
Le Mans Master
Joined: Oct 2003
Posts: 6,130
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From: seattle WA
Re: Stuttering when hot: Help! (Whitvette)
Not the gas Pal, I run 89 almost all the time. 244 with a 160, you've got other problems, are your fans coming on? Any crud (leaves etc.) in front of radiator? :seeya
Thread Starter
Le Mans Master
Joined: May 2003
Posts: 5,362
Likes: 3
From: Delray Beach FL
Re: Stuttering when hot: Help! (rick lambert)
Well, I just put in a tank of 93 octane. The stumbling is almost gone. I think I might have gotten a bad tank of gas. As for the temps getting up there, I am going to remove the shroud on Saturday and see if I can clean our in front of the radiator. I see a couple of leaves, but nothing that would hinder cooling that bad. Fans are both working. Next thought is that the thermostat I put in may not be working properly. If cleaning the radiator doesn't do it, that will be the next thing I will do.
:cheers:
:cheers:
