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Old 08-24-2007, 03:36 PM   #1 (permalink)
NormM
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Running out of options (5.7 vortec stalling)

If anyone has any ideas about loss of power and stalling in a 2000 Chevy 2500 (HD-van) with a 5.7 (76K miles). Two disabling events, hot days, loss of power at more than 20% throttle, followed by stall, no restart for about 45 minutes. New fuel pump 6 mos. ago. No codes/scans ok, as far as I know, runs at 188F going down the road (scanner plugged in). Decent fuel pressure at idle/slight load against brake, when checking it in driveway. Coil ohms out ok, installed new one anyway. Runs fine generally, cannot get it to fail when I want to - may be heat related.
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Old 08-24-2007, 03:46 PM   #2 (permalink)
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New fuel filter? I hope it was replaced when the fuel pump was done. Was it doing the same thing before you replaced the pump?
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Old 08-24-2007, 06:01 PM   #3 (permalink)
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Check fuel pressure while driving the truck. Also if truck has a mass airflow sensor, I would clean the sensor carefully. I have seen some dirty one cause some pretty weird problems.
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Old 08-24-2007, 06:25 PM   #4 (permalink)
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I did replace the fuel filter when I did the pump. It has never had this problem before the 2x this summer. I will clean MAF and check out the throttle assy. I was wondering about the FP regulator (and if they are generally reliable), but wondering why I have had only intermittant trouble, and runs fine most of the time. I will try to get out and check FP while running, and hope it shows something. My wife is avoiding driving it for now, until I find something definitive. Our '89 Suburban is reliable backup!
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Old 08-24-2007, 06:38 PM   #5 (permalink)
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Maybe it needs a new owner. J/K
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Old 08-24-2007, 06:42 PM   #6 (permalink)
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Roger that, but it's clean! How about a new diesel Chevy or a Sprinter...
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Old 08-24-2007, 06:46 PM   #7 (permalink)
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maybe ignition module
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Old 08-24-2007, 06:49 PM   #8 (permalink)
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Quote:
Originally Posted by normm;1961394;
if anyone has any ideas about loss of power and stalling in a 2000 chevy 2500 (hd-van) with a 5.7 (76k miles). Two disabling events, hot days, loss of power at more than 20% throttle, followed by stall, no restart for about 45 minutes. New fuel pump 6 mos. Ago. No codes/scans ok, as far as i know, runs at 188f going down the road (scanner plugged in). Decent fuel pressure at idle/slight load against brake, when checking it in driveway. Coil ohms out ok, installed new one anyway. Runs fine generally, cannot get it to fail when i want to - may be heat related.
check terminals in connector at fuel tank module ( burnt and discolored) seen this problem several times, not easy for you to do since you have to drop the fuel tank to check the terminals,usualy after the stall the terminals cool down and regain connection and the fuel pump will run again.
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Old 08-24-2007, 07:19 PM   #9 (permalink)
NormM
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I think I can just barely get to that connector on this van. I installed a new pigtail when I replaced the pump, though - but I should still check it.
Are the ignition modules prone to intermittent failure from heat?
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Old 08-24-2007, 07:43 PM   #10 (permalink)
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Quote:
Originally Posted by normm;1961772;
i think i can just barely get to that connector on this van. I installed a new pigtail when i replaced the pump, though - but i should still check it. Are the ignition modules prone to intermittent failure from heat?
if you replaced the pigtail it should be ok (maybe)
heat can effect the module...usualy it causes a no crank after the engine is switched off and given a little time for heat sink to set in,a gallon jug of cool water poured onto the module will wake it back up if the problem is intermitant
but if it was an ignition problem the engine should cut off and not cause a reduced power problem.
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