Stalling when hot
Thread Starter
Racer
Joined: Oct 2010
Posts: 308
Likes: 43
From: Suffield CT
Stalling when hot
Over the winter I did a bunch of upgrades on my ‘71 Big Block: converted from the TH400 to a Tremec TKX 5 speed, aluminum radiator with a Spal electric fan, and a 140amp alternator to run it all. Car was overheating at first but I got that worked out, now it stays cool and runs great. That is until I’ve been driving for a bit, then when I push in the clutch or put in neutral it just dies, no sputter it’s almost like the key was turned off. If I hit the gas it’ll keep running, let off and it will idle for 30 sec or so and then just die. Every time it dies I can turn the key and it immediately restarts, don’t even have to touch the gas pedal. Adjusting the idle doesn’t make much of a difference.
I have an HEI in it so I tried swapping the ignition module in case that was starting to act up, no difference. This came on all the sudden after I’d finished all the upgrades so I’m a bit stumped. Any thoughts? Carb (Edelbrock version of quadrajet) was rebuilt about 10 years ago. Definitely not vapor lock because I had that issue before and it would stumble first (I ran an electric Holley pump and return from near the carb to solve that problem).
Thanks,
Paco
I have an HEI in it so I tried swapping the ignition module in case that was starting to act up, no difference. This came on all the sudden after I’d finished all the upgrades so I’m a bit stumped. Any thoughts? Carb (Edelbrock version of quadrajet) was rebuilt about 10 years ago. Definitely not vapor lock because I had that issue before and it would stumble first (I ran an electric Holley pump and return from near the carb to solve that problem).
Thanks,
Paco
Thread Starter
Racer
Joined: Oct 2010
Posts: 308
Likes: 43
From: Suffield CT
I haven’t rechecked it but it was 15 deg initial and 35 all in when I set it a while back. The vacuum advance is connected to the carb, I’m going to try connecting it directly to the manifold vacuum to see if that makes an improvement.
Thread Starter
Racer
Joined: Oct 2010
Posts: 308
Likes: 43
From: Suffield CT
So connecting direct to manifold vacuum made a big difference, and I blocked off the line to the headlights/wiper door to rule out vacuum leaks. It’ll idle fine around 900 rpm but below that and it’ll intermittently stall. I’ll have to reset the timing tomorrow and see but I’m getting closer!
Race Director
Joined: Mar 2017
Posts: 11,906
Likes: 4,479
From: Virginia
So connecting direct to manifold vacuum made a big difference, and I blocked off the line to the headlights/wiper door to rule out vacuum leaks. It’ll idle fine around 900 rpm but below that and it’ll intermittently stall. I’ll have to reset the timing tomorrow and see but I’m getting closer!
Is my vette stock?? HAHA
Joined: Oct 2015
Posts: 20,117
Likes: 9,247
From: Im not allowed to tell you
2020 C3 of the Year Finalist - Modified
2020 Corvette of the Year Finalist (performance mods)
2019 C3 of Year Winner (performance mods)
2016 C3 of Year Finalist
Sounds like you are on the right track
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