*HELP* 77L48 stalling on stop.
Thread Starter
Heel & Toe
Joined: Jul 2020
Posts: 20
Likes: 1
*HELP* 77L48 stalling on stop.
I have a 77 L48.
auto
Recently did a full tune up, new rear shocks, rebuilt carb, new slave arm and checked vac hoses.
The problem my mechanic can find... idles great drives great but when it's warm and I come to a stop (highway ramps, lights, pulling in my driveway..) it loses power. No power steering, gauges go dead, and it wont start until 10-30 minutes later. (Rarely, will start right back up)
any ideas? It's driving me nuts!! My mechanic says she runs like a dream, but for me.. coming to a stop is a nightmare.
*often it has trouble starting as well, when it's warm.
However, occasionally it starts and stops without issue...
WHAT GIVES!?
auto
Recently did a full tune up, new rear shocks, rebuilt carb, new slave arm and checked vac hoses.
The problem my mechanic can find... idles great drives great but when it's warm and I come to a stop (highway ramps, lights, pulling in my driveway..) it loses power. No power steering, gauges go dead, and it wont start until 10-30 minutes later. (Rarely, will start right back up)
any ideas? It's driving me nuts!! My mechanic says she runs like a dream, but for me.. coming to a stop is a nightmare.
*often it has trouble starting as well, when it's warm.
However, occasionally it starts and stops without issue...
WHAT GIVES!?
Last edited by 77L48; Jul 24, 2020 at 02:07 AM.
Is my vette stock?? HAHA
Joined: Oct 2015
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From: Im not allowed to tell you
2020 C3 of the Year Finalist - Modified
2020 Corvette of the Year Finalist (performance mods)
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what is the start problem, no crank or does it just keep spinning over. Could be heat soak of the starter, could be a bad coil, could be a vapor lock or boiling issue with the carb. Usually the carb heat issues take a bit of sitting to absorb into the carb and happen so if it stalls and wont immediately restart then I would lean toward a choke issue. Did this happen before th tune up? if not then I would look at the choke and idle set screws. The car could be tuned with the car cold before the choke was fully open so that it starts and runs good for the first 10 minutes then it wont idle after that. Just turn up the idle set screw there. It could also be stalling because it is flooding, the jets could be sticking insed the carb. YOu can drive it around your neighborhood so its close to home and if it stalls, just pull the carb and look inside the carb and see if the fuel is seeping into the throat
Le Mans Master
Joined: Aug 2017
Posts: 8,336
Likes: 2,810
From: Cool Northern Michigan
"Gauges Go Dead"
This indicates an electrical issue, possibly a poor ground cable connection due to heat & corrosion.
Should be four places that need to be removed, wire brushed, reconnected.
Battery GRD post.
Battery GRD cable at rear frame.
GRD strap near starter to block.
GRD strap from block to frame.
This indicates an electrical issue, possibly a poor ground cable connection due to heat & corrosion.
Should be four places that need to be removed, wire brushed, reconnected.
Battery GRD post.
Battery GRD cable at rear frame.
GRD strap near starter to block.
GRD strap from block to frame.
Melting Slicks
Joined: Apr 2001
Posts: 3,399
Likes: 279
From: Olmsted Falls, Ohio
I agree.
The "Gauges go dead" is a pardon the pun, "dead giveaway" that it is not a carb issue, nor an engine issue, but an electrical issue.
And why does it take 20-30 minutes to restart - heat soak maybe?
Only dies when warm - again something electrical and heat related?
The "Gauges go dead" is a pardon the pun, "dead giveaway" that it is not a carb issue, nor an engine issue, but an electrical issue.
And why does it take 20-30 minutes to restart - heat soak maybe?
Only dies when warm - again something electrical and heat related?
Last edited by KenSny; Jul 24, 2020 at 08:38 AM.
Thread Starter
Heel & Toe
Joined: Jul 2020
Posts: 20
Likes: 1
I agree.
The "Gauges go dead" is a pardon the pun, "dead giveaway" that it is not a carb issue, nor an engine issue, but an electrical issue.
And why does it take 20-30 minutes to restart - heat soak maybe?
Only dies when warm - again something electrical and heat related?
The "Gauges go dead" is a pardon the pun, "dead giveaway" that it is not a carb issue, nor an engine issue, but an electrical issue.
And why does it take 20-30 minutes to restart - heat soak maybe?
Only dies when warm - again something electrical and heat related?
Thread Starter
Heel & Toe
Joined: Jul 2020
Posts: 20
Likes: 1
what is the start problem, no crank or does it just keep spinning over. Could be heat soak of the starter, could be a bad coil, could be a vapor lock or boiling issue with the carb. Usually the carb heat issues take a bit of sitting to absorb into the carb and happen so if it stalls and wont immediately restart then I would lean toward a choke issue. Did this happen before th tune up? if not then I would look at the choke and idle set screws. The car could be tuned with the car cold before the choke was fully open so that it starts and runs good for the first 10 minutes then it wont idle after that. Just turn up the idle set screw there. It could also be stalling because it is flooding, the jets could be sticking insed the carb. YOu can drive it around your neighborhood so its close to home and if it stalls, just pull the carb and look inside the carb and see if the fuel is seeping into the throat
Thread Starter
Heel & Toe
Joined: Jul 2020
Posts: 20
Likes: 1
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Is my vette stock?? HAHA
Joined: Oct 2015
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Likes: 9,418
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
I didn’t see the gauges go dead part
. If it looses power and it’s truly random, try a battery test... It could be a coincidence as to the relation with the tune up. If you power to the whole car it could be a bad weld in the cells. When this happened to me with a Diehard battery back in 89. It was explained to me that the way they make their batteries was they put the cells in the case, fill with fluid, cap it then run high voltage through it to weld the plates together. If one of those welds cracks the battery just dies, then it can reconnect randomly and show no problems when it’s checked. They could be made differently but the symptoms are the same. Swapping the battery solved mine, but expensive just to throw ina new one.... I would check the battery connections at the starter, the horn relay, To eliminate those as issues then swap in a known good battery as a test or try and get yours load tested. Either that one the ignition switch is wacky but I doubt it
. If it looses power and it’s truly random, try a battery test... It could be a coincidence as to the relation with the tune up. If you power to the whole car it could be a bad weld in the cells. When this happened to me with a Diehard battery back in 89. It was explained to me that the way they make their batteries was they put the cells in the case, fill with fluid, cap it then run high voltage through it to weld the plates together. If one of those welds cracks the battery just dies, then it can reconnect randomly and show no problems when it’s checked. They could be made differently but the symptoms are the same. Swapping the battery solved mine, but expensive just to throw ina new one.... I would check the battery connections at the starter, the horn relay, To eliminate those as issues then swap in a known good battery as a test or try and get yours load tested. Either that one the ignition switch is wacky but I doubt it
Last edited by Rescue Rogers; Jul 24, 2020 at 12:31 PM.
Thread Starter
Heel & Toe
Joined: Jul 2020
Posts: 20
Likes: 1
As for the battery... it has been tested and it is at 100%. CAA/AAA came out and tested the battery and couldn't find any deficiencies.
Instructor
Joined: Jun 2003
Posts: 112
Likes: 5
From: Wisconsin
Is it the same carburetor rebuilt.
if so what was wrong with it.
what type is it.
if your willing to repeat the problem,
as soon as it cuts out pop the hood and check if your getting fuel to the carb.
if so what was wrong with it.
what type is it.
if your willing to repeat the problem,
as soon as it cuts out pop the hood and check if your getting fuel to the carb.
Melting Slicks
Joined: Apr 2001
Posts: 3,399
Likes: 279
From: Olmsted Falls, Ohio
So we're back to saying that the carb causes all the gauges to loose power? I've never even heard of that happening.
I'm wondering if maybe there is a short in brake light system. Comes to a stop, car dies.
Who knows? But, my money is still on electrical.
I'm wondering if maybe there is a short in brake light system. Comes to a stop, car dies.
Who knows? But, my money is still on electrical.
Instructor
Joined: Jun 2003
Posts: 112
Likes: 5
From: Wisconsin
so when your cruising and your car dies / cuts out what happens.
Last edited by 69 LT1; Jul 24, 2020 at 02:49 PM.
Thread Starter
Heel & Toe
Joined: Jul 2020
Posts: 20
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It was leaking gas onto the top of the engine.
I noticed it started to eat the paint.
I'm getting gas to the carburetor.
It's happened a few times and I've noticed it gets gas into the right places
Thread Starter
Heel & Toe
Joined: Jul 2020
Posts: 20
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There's a guy on my street that works on classics. I'm going to see him tonight. Will most definitely mention the electrical as a solution. I know little about cars so I very much appreciate yours and everyone's input.
Thread Starter
Heel & Toe
Joined: Jul 2020
Posts: 20
Likes: 1
When my car shuts down:
GEN light comes on
Loss of all power (steering/lights/gauges), as if I've turned off the engine
Followed by:
Trouble restarting
With eventual start-up some minutes later, it dies again on stopping... but not every time.
I've tried stopping hard and soft.. both ways it cuts out
GEN light comes on
Loss of all power (steering/lights/gauges), as if I've turned off the engine
Followed by:
Trouble restarting
With eventual start-up some minutes later, it dies again on stopping... but not every time.
I've tried stopping hard and soft.. both ways it cuts out
Thread Starter
Heel & Toe
Joined: Jul 2020
Posts: 20
Likes: 1
May I add also:
It is not always on the stop itself. Many times I have been stopped for a minute without issue and i feel ok and then it stalls out. So, it isn't specific to the stopping itself. Sometimes I have stopped and am idling when I stall.
Sorry if I forgot to mention this important detail
It is not always on the stop itself. Many times I have been stopped for a minute without issue and i feel ok and then it stalls out. So, it isn't specific to the stopping itself. Sometimes I have stopped and am idling when I stall.
Sorry if I forgot to mention this important detail
Pro
Joined: Feb 2017
Posts: 518
Likes: 365
From: San Diego
2023 C3 of the Year Finalist - Modified
Is this statement true?: The car is idling, it stops, the gen light comes on, but all the gauges go dead - as if the car is off. I am trying to figure that one out. Thanks, I hope we can solve this for you.
Instructor
Joined: Jun 2003
Posts: 112
Likes: 5
From: Wisconsin
you answered a question i was quoting someone else.
you didn’t answer my quote above.
you start with the simple check ( fuel ) and move on from there.