1999 GMC Safari AWD minvan, will only start when in nuetral and rolling, not stopped but rolloing? Also the van sometimes shuts off while driving, but will restart if in nuetral. what's the fix?
Country: United StatesMake: GMModel: SafariYear: 1999Engine: 4.3
new starter, fuel pump, altenator.
I have to admit, I'm curious as to how you were able to determine that it would start running if you got it rolling first.I've never heard of such a phenomenon, but in these days of computer technology, nothing is out of the question anymore. I would treat this as a "no start" and diagnose it as such. With the vehicle stationary.First checks: fuel pressure, scan PCM for trouble codes, check for presence of spark at the spark plugs.
with someone in the drivers seat and another pushing the vehicle, it is starting. other criteria is also that the guages and electonic odometer flash on and off
Does this have any aftermarket accessories like an alarm system or remote start system?
no it doesn't
OK, that's good. The only other point here is: are you the original owner? There may be some aftermarket electronics stuffed up under the dash that you're not aware of. If this were in my shop, I'd at least peek under there with a flashlight and just make sure.The flashing odometer is what points me in that direction, that is an odd symptom. I'm inclined to say that you have a general power failure of some sort, like a battery cable, ground cable connection, a bad fuse that is backfeeding power in some weird way.... I would go through all of those basics: check all fuses, check and clean the battery cables as necessary, check the battery cable connections at the engine and fuse block.I don't know that I would replace any more parts on this until I had a scan tool in hand to see what is going on when it won't start. There is potentially a lot of data to be gained from a good scan tool. This is one of those concerns that could literally be just about anything, from a bad connection to a bad computer. Scan tool data will probably hold the key.
someone said that maybe the anti theft device, would that be a concern? I will check the fuses and then if that does not help, get it scanned thanks!
The factory-equipped antitheft device won't do that. But an aftermarket one definitely would, blinking lights on the dash is the big giveaway that there might be an aftermarket controller under the dash that's wired into the lights and/or starting circuits.
ASE Master Technician, L1, Master GM Technician. Over 20 years of bumper to bumper GM experience.