Question about 1995 GMC Sierra C1500
My 95 gmc sierra wont start when hot starts and works fine when running but when i stop it and go to restart it s hard to start
Im guessing it's a 4.3 L engine. Sounds like your coil is acting up when the truck heats up. Bad coil, or small wires going to the coil
Posted on Apr 13, 2014
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Posted on Jan 02, 2017
I experienced the same head ache. First attempt was to replace the thrmostat and after taking it apart I realized that there was nothing wrong with it. I then removed the plastic cover/panel located under the dash board on the passenger's side. (only a few 4-5 smalls screws) Removal will enable you to see the on/off switch/gate moving/rotating as you turn the knob to hot or cold positions, on the control panel. If that switch/gate seems to work ok, then the trouble is within the heater core. Many mechanincs suggested that I replace the heater core. A very expensive proposition.
I checked the heater core supply/intake hose and found it hot to the touch, while the return hose was nearly cold. It was definitely a heater core blockage. I removed both ends (supply and return) hose connections/clamps. They are located near the fire wall in the engine compartment. A special tool is very helpful to remove those clamps easily and to replace them as well. It can be done the old fashion way but this tool was a life saver and reduced work time to just minutes. (Tool is $70.00 bucks at auto parts store,so I borrowed mine from a mechanic/friend)
I then hooked up a garden hose to the return end of the heater core and reversed the flow of coolant/water through the heater core. My truck is a Sierra 2000 and I refuse to see how a heater core could get clogged up with clear coolant alone. To my surprise a flat piece of rubber about the size of a quarter blew out of it and the flow of water became unobstructed. I reconected the ends of the hoses to the heater core, replaced the lost antifreeze & everything returned back to normal. No money spent for something most mechanics suggested I replace control valves/switches ($280.00) replace heater core ($500.00) etc etc. I am glad I was curageous enough to tackle this myself and save a few pennies. Good luck, and I hope this will work for you.
Posted on Dec 02, 2008
GMC's are notorious for fuel pump problems. Not an easy repair. You have to drop the fuel tank to replace. About an $700-800 job at the dealer.
Posted on May 16, 2009
bamerson: have your A/C system pressure tested. Verify you have enough Freon in your A/C system. If your pressure is low, or no pressure is detectable, then you should recharge your A/C system and check for leaks with liquid dye or a Freon sniffer. If this information has been helpful, please vote, thank you.
Posted on Jun 05, 2009
that has a votec engine in it the fuel pressure is droping at knight and it takes 60 psi before the injectors will fire most likely cause fuel pump ,leaking injector ,or a feul pressure regulator
Posted on Jul 14, 2009
even though parts are new they also come with defects so it sounds as if when you turn the key you hear it working and other times not at all hmmm connections are tight ? could be faulty fuel pump or relay .
Posted on Aug 24, 2009
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