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#2813 of 3676 2001 Blazer stalling
Dec 13, 2006 (2:29 pm)
We have a 2001 Chevy Blazer that has begun an intermittent rough starting problem. When the problem ocurrs, the engine starts immediately as always but the idle is rough and if you try to move in reverse or drive the engine stalls. To make the vehicle move you have to give it a lot of gas pedal and hold the pedal down. If you let up on gas pedal, the vehicle stalls and completely shuts down. It seems to do this until the engine has been running for 10 to 15 minutes and then all is OK. This strange problem only happens once every 2 weeks or so at all other times the vechile starts and moves properly.
#2814 of 3676 Re: 2001 Blazer stalling [gbags]
Dec 13, 2006 (2:38 pm)
Could be many things, so check:
1. fuel pressure
3. other electrical such as coil
5. filters gas and air
#2815 of 3676 Re: blowing cold air [repairdog]
Dec 13, 2006 (7:09 pm)
I've been having a similar problem - no heat from only the defroster though. My blazer is a 2001 with about 82k on it and the coolant has never been flushed. The vents seem to put out heat (although its not super warm air, its definitely warmer than what comes out of the defroster). Do you think its the same problem or could it be something else? Also, if I do get the cooling system flushed, does that automatically flush the heater core as well(if that indeed is the problem) ?
#2816 of 3676 Re: blowing cold air [pspiesman]
Dec 14, 2006 (1:51 am)
Could be and yes flush that out and put a new thermostat and Stant cap on. Sometimesa chemical flush will actually create a leak in the core or the crap gets in the water pump seals and that goes. The 4.3s have a weak lower intake gasket that most find leaking by 100k. I separately use two 3 foot sections of heater hose 5/8 and 3/4" to do the core with a garden hose and hold it to them with my hand to limit pressure and do in both directions till runs freely and clean. With too much Dex cool in the system a voltage diff of a few tenths volts can occur in the fliud and eats the core and radiator especially if the grounds are bad.
#2817 of 3676 Re: 1990 s10 Blazer (4.3L) hesitates on acceleration [repairdog]
Dec 14, 2006 (12:50 pm)
So here's the latest. I changed the rotor and cap (both needed it) and the fuel filter again. Then, the blazer failed to start at all. I found that it had a bad ignition coil. After changing this it fired right up and now seems not to hesitate (although I haven't really given it a solid test drive yet.)
Would an ignition coil in the process of failing cause a hesitation on acceleration (especially around 20-30mph when accelerating at any speed more than a crawl)? Or... is it likely that I'll still be dealing with the hesitation issue in the future?
Thanks for all the help.
#2819 of 3676 Re: blowing cold air [repairdog]
Dec 14, 2006 (3:07 pm)
I started by flushing the heater core per your suggestion and it fixed the problem. It was easy and the heat works great now. I will probably still follow through with your suggestion of flushing the whole system and replacing the the cap as well. I was surprised however how little "sludge" came out. There was just a little browish-pink water then it ran clean. It definitely fixed the problem though.
Dec 16, 2006 (7:09 am)
I have a 2000 Blazer in the shop right now and it has been there for a week. The tech does not seem to be able to find the problem. It will run fine then it will stall. The engine does not hesitate before it stalls or give any indication that it is about to stall. I stalls both when idling, and when driving down the street. After it stalls it starts right back up as if nothing was wrong. The engine light does not stay on. I have changed the fuel pump, fuel filter, spark plug wires, had the injectors cleaned. The tech claims that everything checks normal on the diagnostic machine but then the engine stalls. He is not getting any codes. Any ideas?
#2821 of 3676 Re: Stalling [sarge10]
Dec 17, 2006 (4:28 am)
This at a GM dealer - if not might want to do that. Could be many things as easy as a defective cap/rotor if an aftermarket one - change with a Delco to rule out. Assume coil was tested and with a scan tool all sensors can be looked at. Possible crank sensor failing but dealer can pinpoint.
#2822 of 3676 Re: Heater problem-1998 Blazer [efk4755]
Dec 17, 2006 (3:15 pm)
I am also having this problem. When ever I turn the heat to go to the floor it blows out the windshield defrost. All other settings work fine. Please help!