Cutting Out on 1-2 Shift When Hot
Thread Starter
Race Director
Joined: Dec 1999
Posts: 11,813
Likes: 32
From: Work
St. Jude Donor '09
Cutting Out on 1-2 Shift When Hot
Here is the symptom...And this is only when the motor is hot (220+).
Under WOT between the 1-2 shift the car starts to cuttout. It's kind of a sputter heard through the exhaust. I have installed new plugs, wires, fuel filter, and Opti. It never acts up when the motor is cold, cool, or just warm...just when it's real hot. Also, when I punch it from a roll, say 20, when the motor is hot like this it will also cuttout (pretty badly too) until it shifts to second, then it just takes off. I know air temp effects performance, it has been in the upper 90's here, but what would cause these symptoms during hot days?
It never does this between 2-3 or 3-4 shifts. I need to attempt to fix this since I'm planning on going with a 100 shot soon.
All comments are welcome. :cheers:
Eric
[Modified by HOWSER, 1:17 PM 8/2/2002]
Under WOT between the 1-2 shift the car starts to cuttout. It's kind of a sputter heard through the exhaust. I have installed new plugs, wires, fuel filter, and Opti. It never acts up when the motor is cold, cool, or just warm...just when it's real hot. Also, when I punch it from a roll, say 20, when the motor is hot like this it will also cuttout (pretty badly too) until it shifts to second, then it just takes off. I know air temp effects performance, it has been in the upper 90's here, but what would cause these symptoms during hot days?
It never does this between 2-3 or 3-4 shifts. I need to attempt to fix this since I'm planning on going with a 100 shot soon.
All comments are welcome. :cheers:
Eric
[Modified by HOWSER, 1:17 PM 8/2/2002]
Thread Starter
Race Director
Joined: Dec 1999
Posts: 11,813
Likes: 32
From: Work
St. Jude Donor '09
Re: Cutting Out on 1-2 Shift When Hot (dscottr)
This is something I had thought about...but why would heat be a factor in this? I would think that if this was the case it would do this at each 1-2 shift under WOT.
How do you go about adjusting the shift points?
Eric
How do you go about adjusting the shift points?
Eric
Pro
Joined: Sep 2001
Posts: 743
Likes: 4
From: Guyton GA
Re: Cutting Out on 1-2 Shift When Hot (HOWSER)
Your rev limiter doesn't change with temp. You may want to check for a fuel pressure drop under the conditions you spoke of. Maybe a loose fuel pump pickup tube.
Racer
Joined: Jun 2002
Posts: 262
Likes: 0
Re: Cutting Out on 1-2 Shift When Hot (merrick)
When my car is cool it shifts fine also, but then after the first run at the track it takes longer to shift and hits the rev. limiter. I figure it just takes a little longer to shift when the tranny is hot. I have been told you need to pull the tranny to adjust the governor on the 700 R 4, and that B&M makes a kit for this purpose, to raise or lower shift points. If you have a 4L60E tranny, you can program your ecm for different shift points.
Pro
Joined: Sep 2001
Posts: 743
Likes: 4
From: Guyton GA
Re: Cutting Out on 1-2 Shift When Hot (dscottr)
Slow to shift, that makes sense. On a 700R4 the governor is on the driver's side under the round cover in the tail housing. You wouldn't have to pull the tranny.
Thread Starter
Race Director
Joined: Dec 1999
Posts: 11,813
Likes: 32
From: Work
St. Jude Donor '09
Re: Cutting Out on 1-2 Shift When Hot (85_togo)
i'm no mechanic, but i play one on TV :jester could also be a clogged CAT! :confused:
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
Top 10 Most Expensive Corvettes Ever Sold on Bring A Trailer
Brett Foote
10 Things Every Corvette Owner Needs (2026 Edition)
Michael S. Palmer
8 Most "Only Corvette Owners Understand" Quirks and Problems
Pouria Savadkouei
10 Reasons the C6 Z06 is Still A Performance Benchmark After 20 Years
Joe Kucinski
How Much Horsepower Every Corvette Engine "LOST" in 1972
Joe Kucinski
Top 10 DOs and DON'Ts for Protecting Your Convertible Top!
Michael S. Palmer
Top 10 Most Explosive Corvettes Ever Made: Power-to-Weight Ratio Ranked!
Joe Kucinski
150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter
Joe Kucinski