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99 LS1 shutting off when warm/in traffic

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Old 03-20-2017, 10:00 PM   #1
nad
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Exclamation 99 LS1 shutting off when warm/in traffic

Having a problem with my 99 Camaro LS1, cam/ls6 intake. The car runs great, drives great otherwise. Back in July on a VERY HOT day I did a car cruise, and when idling in slow moving traffic, the car just shut off. Only way to get it to start was to turn the key all the way off, and it would start back up with NO ISSUE. But would only run maybe 5 minutes, whether I was moving or not. Only way I could get it home was to park it, shut it off, and leave it set for about an hour, then I could make the 15 minute drive home with no issues.

This past weekend I went to the local 1/4 mile track, and when waiting in the staging lanes, the car started to backfire really bad. I didn't think anything of it, because the weather was a cool 60*F. Suddenly the car just turned off. I tried cranking and it wouldn't start back up. Had to turn the key all the way back, and then the car started right up no issue. It died again about 4 times in the staging lanes. Finally, I got to the line to make a pass, and at about the 60' mark, I went to shift, and it just died. Coasted all the way down the track, trying to start it.

Once I got it parked, I turned the key all the way off, and then it fired back up enough to get it parked in the lot. I let it set about 2 hours, and drove it 60+ miles home without issue.

The issue seems to only show up when I'm driving in very slow traffic or just idling. The car does not overheat. Battery is brand new, like 3 weeks old. No check engine light, no codes stored. Absolutely no running issues at all with highway driving, or normal street driving. Checked the obvious grounds at the front of the motor.

Please help!!

Last edited by nad; 03-20-2017 at 10:24 PM.
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Old 03-21-2017, 04:04 PM   #2
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This is a complete longshot but my dad had a similar issue with an LT1 swapped Chevelle doing very similar things. When his PCM got hot it would do this. Pull your PCM and make sure you have no moisture in the connections but also see how it feels when your driving and it happens, see if it is getting hot. Again this is a long shot but if you have no codes could be your issue
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Old 03-22-2017, 10:21 PM   #3
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Thanks for the suggestion, I guess the only way to narrow it down would be to just start swapping parts until the problem goes away. Biggest problem is, I've had this car for a year and only had this happen 3 or 4 times. Only happens when the car is driven hard or idled in high heat situations for long periods of time.
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Old 03-23-2017, 08:41 AM   #4
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Just let us know your outcome on the fix for future purposes. I read so many threads that get me roped in and then no fix is ever posted lol
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