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troubleshootmyvehicle.com > GM > 4.3L, 5.0L, 5.7L May 5, 2011 - The engine will start momentarily and after a few seconds will die or... 2.... Tahoe. 1996, 1997, 1998, 1999, 2000. GMC Vehicles: Sierra C1500
My guess would be something electrical that is not working due to the temp. Like a relay. A relay could loose magnetic power for a few tries then start working. Or the engine temp sensor could be out of calib and telling the computer the temp is 90 degrees when it is only 50. You could use a scanner to read the sensors and look for something not right. Without knowing what is missing in the equation its going to be tough to diagnose it. You really need to know if you are loosing voltage to the coil or the injectors or if the fuel mixture is too lean, etc.
this could be a symptom of a failed or failing antitheft system. one symptom is this. "engine starts for 2 to 5 seconds, then stalls". This will be followed by a light on the dash that says SECURITY. If you see this, go to this link for help.
That is strange. Do not rule out the possibility that you have a leak somewhere in the vehical. I would check this out immediately, or it is going to cost more in the long run. Check the oil pan and the ground where you park your vehical.
Standing at front of truck, looking under the hood.
The closest cylinder to you on your right is #1. #2 is close left. #3
is middle right, #4 middle left. #5 is back right and #6 is back left.
Firing order is 1-6-5-4-3-2. This is the sequence for placing the wires
on distributor cap in a clockwise direction. #1 spot on cap is the 3rd
post after the wiring harness (clockwise). This post should be closest
to cylinder #5.
Power for those devices is provided from the retained accessory power which is controlled by the BCM (body control module) which is in the console.I had the same problem with the radio, wipers and windows all stopping. I tried running the diag procedure for the BCM but couldn't get in to run. I then read online about a loose connection in the BCM, so I took the 4 screws out of the console, got access to the BCM and removed it. inside is a small circuit board. On the back of the circuit board where most of the soldering is, there was a bad connection to a relay. Re-soldered the connection and the problem went away.