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Car Stalls only during hot weather

Tiny
MEJIAD
  • MEMBER
  • 2002 CHEVROLET SUBURBAN
  • V8
  • 2WD
  • AUTOMATIC
  • 167,000 MILES
I have a 2002 chevy suburban. Last year on our way to Florida we started having trouble. It wouldn't go past 50 mph. At one point it wouldn't go mast 10 mph then it just completely stalled out. After about 20 minutes it started up and ran fine for another while. Then it did the same thing. Over this past winter it ran fine, no problems. Now with the hot weather it is doing it again. After you run it for about an hour, only in hot weather will it stall out. You let is sit for a while and its good to go for another while. The check engine light begins to flash right before it stalls out and dies. I had transmission rebuilt last year, Fuel pump went out and I replaced it as well as fuel filter, but car still doing the same thing. I've taken it to a mechanic and the computer says there is an error code having to do with evap system but thats it. Don't want to keep throwing money at it and not be able to drive it in this hot Texas heat.
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Friday, February 18th, 2011 AT 7:28 PM

5 Replies

Tiny
PROTECH1980
  • MEMBER
  • 901 POSTS
This is going to be a difficult one, when that check engine light flashes it means your engine is misfiring, which should store a code but your mechanic said there are no codes. When it is failing has anyone checked fuel pressure, spark? And when it stalls does it restart right away or is it a crank no start till you let it sit a while? Let me know.
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Friday, February 18th, 2011 AT 9:05 PM
Tiny
MEJIAD
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No, fuel pressure/spark has not been checked. When I took it to the mechanic it was a cool cloudy day. They let the car run for a good while and they took it for a drive and it didn't misfire. They told me to take it back on a warm/hot day that way they can drive it while it stalls. When it starts to misfire-- if you turn it off right away it will start up again with no problem. A few times it has completely stalled out and it wont start til you let is sit for about 20 minutes. It drives fine during the night. Also, when you its idling there is strong smell coming from the exhaust. Can there be some type of carbon build up?
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Tuesday, February 22nd, 2011 AT 4:53 PM
Tiny
PROTECH1980
  • MEMBER
  • 901 POSTS
Do you if they scanned this vehicle for diagnostic trouble codes? And if so do you know the specific codes/ would be helpful.
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Tuesday, February 22nd, 2011 AT 5:02 PM
Tiny
MEJIAD
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The report said it was the evap system; codes 446-453.
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Tuesday, February 22nd, 2011 AT 5:28 PM
Tiny
PROTECH1980
  • MEMBER
  • 901 POSTS
That strong smell is probaly the engine running rich, given this info I would see if your mechanic has the ability with his scan tool to see history misfire counters and see if the misfires are isolated to one bank (side), if so I would check into this problem being an intermittent o2s riching out one bank causing this issue.
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Tuesday, February 22nd, 2011 AT 10:18 PM

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