Hot topic - 94 heating up
Thread Starter
Heel & Toe
Joined: Apr 2017
Posts: 22
Likes: 0
From: Johns Creek Georgia
Hot topic - 94 heating up
I've had my "new to me" 94 coupe for a few weeks now and finally getting around to putting her under stress with real traffic situations in 85+ degree heat. (I'm in Atlanta) I've read of the overheating issues in these beauties.
All well until she started to hesitate a bit cruising along after driving in the heat for a while. I braced myself for the total shut down..but it never happened. I babied the throttle a bit and she kept driving out pretty smooth. I felt like maybe I should really goose it at that point to clear out any carbon deposits but did not want to press my luck.
Naturally right after that I got stuck in a huge line of traffic behind an accident up ahead.
Really good test now I thought.... So, I hung in there in the heat as long as possible until the temp Guage started getting out of hand. Maybe 230 degrees... I bailed out of the line of traffic and headed the other way... Soon the temp Guage dropped down to around 200...
Also I felt some hesitation again at throttle ....felt like it was about to kind of back fire and crap out but never did...so I high-tailed it back home and consider myself lucky I didn't end up on the side of the road.
Any relation between the over heating and the hesitation at throttle?
All well until she started to hesitate a bit cruising along after driving in the heat for a while. I braced myself for the total shut down..but it never happened. I babied the throttle a bit and she kept driving out pretty smooth. I felt like maybe I should really goose it at that point to clear out any carbon deposits but did not want to press my luck.
Naturally right after that I got stuck in a huge line of traffic behind an accident up ahead.
Really good test now I thought.... So, I hung in there in the heat as long as possible until the temp Guage started getting out of hand. Maybe 230 degrees... I bailed out of the line of traffic and headed the other way... Soon the temp Guage dropped down to around 200...
Also I felt some hesitation again at throttle ....felt like it was about to kind of back fire and crap out but never did...so I high-tailed it back home and consider myself lucky I didn't end up on the side of the road.
Any relation between the over heating and the hesitation at throttle?
Melting Slicks
Joined: Oct 2016
Posts: 2,024
Likes: 363
From: Central Alabama
First, have you read the sticky on the cooling system?
Did you have the A/C on?
If the A/C was off the primary cooling fan does not turn on till 226F secondary comes on at 234F.
DO NOT use the analog gauge. Use the digital readout in the LCD.
Once the fans turn on they remain on until coolant drops by 41F.
The first time I sat at a train crossing I got nervous as temp climbed but the fans came on as designed and cooled the engine down.
Did you have the A/C on?
If the A/C was off the primary cooling fan does not turn on till 226F secondary comes on at 234F.
DO NOT use the analog gauge. Use the digital readout in the LCD.
Once the fans turn on they remain on until coolant drops by 41F.
The first time I sat at a train crossing I got nervous as temp climbed but the fans came on as designed and cooled the engine down.
Burning Brakes
Joined: Nov 2009
Posts: 828
Likes: 103
From: Olney MD
overheating-C4
I have 2 C4s. Both like to run hot. In both cases, they run hotter without the Climate Control on, so if you're enjoying the nice weather and notice the temps climbing, turn the AC on. It's counterintuitive, but turning the AC on forces the fans on and that brings the temps down as BelAir Brian noted.
A nice feature that my vert has (installled by the PO) is a manual fan switch that allows me to turn on one or both fans regardless of the AC being on. One of the popular Corvette aftermarket vendors sells it as a kit, with all the instructions. I recommend it!
Good luck with your NEW C4!!
A nice feature that my vert has (installled by the PO) is a manual fan switch that allows me to turn on one or both fans regardless of the AC being on. One of the popular Corvette aftermarket vendors sells it as a kit, with all the instructions. I recommend it!
Good luck with your NEW C4!!
Thread Starter
Heel & Toe
Joined: Apr 2017
Posts: 22
Likes: 0
From: Johns Creek Georgia
Yes I did read that... Very helpful
Just trying to relate the hesitating at throttle that occurred ...
I am aware that the 2nd cooling fan comes on while ac is on..which is good.
I know it could be a thousand things but seemed like when the car got hotter it started to try to "miss" a little bit accelerating from a stop. I'm sure I'll get it sorted out.
I've got a lot to learn and looking forward to it. Loving the ride too!
Just trying to relate the hesitating at throttle that occurred ...
I am aware that the 2nd cooling fan comes on while ac is on..which is good.
I know it could be a thousand things but seemed like when the car got hotter it started to try to "miss" a little bit accelerating from a stop. I'm sure I'll get it sorted out.
I've got a lot to learn and looking forward to it. Loving the ride too!
Racer
Joined: Nov 2015
Posts: 294
Likes: 40
From: Massachusetts
230 is perfectly normal for an LT1 sitting in traffic. Put this out of your mind and go down the list of diagnosing a misfire. Start by checking fuel pressure, fuel pressure regulator, plugs, wires. Do you know if it has the original multec fuel injectors?
Zen Vet Master Level VII
Joined: Mar 2016
Posts: 5,218
Likes: 1,174
From: Southlake, TX
If it went away after you started moving again and cooler fuel was moving through the rails, I'd chalk it up to a temporary heat soak-ish situation.
Your temps sounds Normal. If you want to run cooler, consider getting your fans to come on earlier. I have a chip in my ECM that has the fans come on at 205 and off again at 200.
Last edited by billschroeder5842; Apr 24, 2017 at 12:18 PM.
Melting Slicks
Joined: May 2013
Posts: 2,692
Likes: 349
From: Sacramento California
Yes I did read that... Very helpful
Just trying to relate the hesitating at throttle that occurred ...
I am aware that the 2nd cooling fan comes on while ac is on..which is good.
I know it could be a thousand things but seemed like when the car got hotter it started to try to "miss" a little bit accelerating from a stop. I'm sure I'll get it sorted out.
I've got a lot to learn and looking forward to it. Loving the ride too!
Just trying to relate the hesitating at throttle that occurred ...
I am aware that the 2nd cooling fan comes on while ac is on..which is good.
I know it could be a thousand things but seemed like when the car got hotter it started to try to "miss" a little bit accelerating from a stop. I'm sure I'll get it sorted out.
I've got a lot to learn and looking forward to it. Loving the ride too!
Increased detonation can also be caused by running a lower octane gas. What grade fuel are you running?
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