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1994 GMC Yukon Questions & Answers
94 Yukon cranks but won't start on cold mornings.
I hope I can help you with your question I believe I can first and foremost if you're having trouble starting your car on cold mornings it's probably going to be a clogged fuel filter or bad fuel pump about to go out you're having symptoms as you described and then whenever you're at 55° things start to warm up and you can start your car okay the filter is so clogged up imagine that look looking like a blood vessel okay when you have a clog in it it doesn't allow the blood to flow freely feel the same way
Yukon wants to stall
Check the MAP sensor connection/connector and either the seal where it plugs in the intake or vacuum hose connection .
Timing
Put a timing light on it and see if the timing jumps arround if so you chain could be bad. You should also put a fuel pressure gauge on it and see what you have for pressure,
Starter
Either it will just click when you turn the key or a fast spinning sound of it turning the gear but it does not engage the flywheel.
1994 GMC Yukon heat
This could be 1 of 2 things 1 being the heater control valve and the other is the heater core is clogged up.
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