ENGINE NOT STARTING

Tiny
BMRFIXIT
  • EXPERT
Fuel pressure should be 60+ psi
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Tuesday, May 2nd, 2017 AT 9:40 AM (Merged)
Tiny
MAYDAY
  • MEMBER
Could it be my fuel regulator because I smeel gas
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Tuesday, May 2nd, 2017 AT 9:40 AM (Merged)
Tiny
ASEMASTER6371
  • EXPERT
Not likely. Most of the issues with your vehicle revolve around fuel delivery.

Did you actually measure the pressure?

Roy
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Tuesday, May 2nd, 2017 AT 9:40 AM (Merged)
Tiny
SHOOKMTN
  • MEMBER
  • 1998 GMC YUKON
  • V8
  • 4WD
  • AUTOMATIC
  • 132,000 MILES
Engine Performance problem
1998 GMC Yukon V8 Four Wheel Drive Automatic 132000 miles

Bought a new, used '98 Yukon in Oregon.

Runs very well; Auto 4wd, ABS, etc.

However, the first start of the day (or otherwise after sitting a very long while, more than a grocery shop, etc) it will not start on the first crank. It DOES typically start readily after the second crank. These cranks are typical in length and sound. Holding a startup crank does not yield results (as compared to two short cranks).

It is winter, so I am not sure if it turns over more readily when its warmer outside. This has been typical for 20 to 40 F in temperature.

An arctic front came through last night and it hit below -0- and and under +10 F. The truck did not start, despite long and short cranks. I eventually ran the battery low and have been recharging.

I am planning to give this to my retired Dad in Montana who needs a reliable vehicle, but can't afford much. What can I do to fix this problem?

Thank you.
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Tuesday, May 2nd, 2017 AT 9:40 AM (Merged)
Tiny
MASTERTECHTIM
  • EXPERT
Theswe trucks are notorious for weak volume fuel pumps. Try spraying a shot of starter fluid into intake and see if it will start, usually that little extra boost gets it running and it will stay running. To test for sure the fuel pump you will need to do a amp draw test on it and you will have to know how to use a multi meter. I will walk you through it if you would like.
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Tuesday, May 2nd, 2017 AT 9:40 AM (Merged)
Tiny
SHOOKMTN
  • MEMBER
So it does start, but it takes a few cranks or waiting until warmer later in the day to try again.

Do you think its a relay or switch or can you tell if it's weak based on the amp draw?

I would love some instructions to test that theory.

Could it be as simple as a new fuel filter, or do you expect the pump is the problem? Injector? O2? Air Intake? Anything else I should consider?

Thanks.
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Tuesday, May 2nd, 2017 AT 9:40 AM (Merged)
Tiny
MASTERTECHTIM
  • EXPERT
If you have not changed the fuel filter then I would do that first. The possibilities of preoblems are endless. Its rare but a coolant temp sensor reading too hot could cause this problem because it leans out the injector because it thinks the engine temp is hotter than it actually is. The starter fluid is the easiest way to do a quick check but the amp draw test is more accurate. There is a fuel pump test lead near the fuse box under hood. It will be a single red wire with a female connector on it, you will need to connect your meter lead to this wire, put your meter on 10 amp dc scale and make sure you put the leads of your meter on the 10 amp hole. Then put the other lead to battery and this will power up the fuel pump and tell you how many amps it is drawing. If its drawing 9 amps or less than the fuel pump is weak.
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Tuesday, May 2nd, 2017 AT 9:40 AM (Merged)
Tiny
ALLPOT
  • MEMBER
  • 1998 GMC YUKON
  • V8
  • 2WD
  • AUTOMATIC
  • 96,000 MILES
98 gmc Yukon not starting after hooking up battery charger reverse fuel pump not getting power replaced fuses and relays also fuel gauge on dash is stuck over the full point please help tried everything?
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Tuesday, May 2nd, 2017 AT 9:40 AM (Merged)
Tiny
RASMATAZ
  • EXPERT
Check and test the computer controlled circuit of the fuel pump relay
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Tuesday, May 2nd, 2017 AT 9:40 AM (Merged)
Tiny
ALLPOT
  • MEMBER
How do I do that is it pretty simple, is it where the chow pump relay is?
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Tuesday, May 2nd, 2017 AT 9:40 AM (Merged)
Tiny
ALLPOT
  • MEMBER
I checked to see if there was power to the relay and there was
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Tuesday, May 2nd, 2017 AT 9:40 AM (Merged)
Tiny
HOPPY46
  • MEMBER
  • 1998 GMC YUKON
  • V8
  • 4WD
  • AUTOMATIC
  • 235,000 MILES
Engine Performance problem
1998 GMC Yukon V8 Four Wheel Drive Automatic 235000 miles

Truck would not start in the AM. It was very cold. I plugged it in and added about 10 gal. Of fresh gas as it was down to less than a 1 4 tank, I also added some gasline antifreeze. Tried starting again shortly after and it did start, however it will idle or you can rev it in park and its smooth ever but now when I put it in drive and give it gas and it sputters and jerk steady until I take my foot of the gas. Why and what has happend so suddenly. Any help would be most appreciated
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Tuesday, May 2nd, 2017 AT 9:40 AM (Merged)
Tiny
PEAR69
  • EXPERT
Check the TPS (throttle position sensor).
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Tuesday, May 2nd, 2017 AT 9:40 AM (Merged)

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