Shuts off while driving?

Tiny
STEVEN7994
  • MEMBER
Exactly, if you had to guess what would you say?
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Tuesday, July 14th, 2020 AT 11:35 AM (Merged)
Tiny
BRIAN REES
  • MEMBER
  • 2002 GMC YUKON
  • 5.3L
  • V8
  • 4WD
  • AUTOMATIC
  • 200,000 MILES
Stalls like it runs out of gas in 80 degrees or above weather sit on the side of the road for 10 to 15 minutes your part came in from the gas tank seems like vehicle starts runs about 20 to 30 minutes same thing over and over when it is cold never had this problem it is not the fuel pump new fuel filter gas cap tried better everything other than sensors what about the crankshaft position sensor getting hot shot in the fuel off please help.
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Tuesday, July 14th, 2020 AT 11:35 AM (Merged)
Tiny
SATURNTECH9
  • EXPERT
Its really hard to say without driving it and getting to see what its doing for myself.
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Tuesday, July 14th, 2020 AT 11:35 AM (Merged)
Tiny
STEVE W.
  • EXPERT
Hot failure is a classic symptom of a bad crankshaft position sensor on the GMs. I have gotten to the point I carry a spare and the wrenches to change it in my Blazer.

A quick test can be done using a can of "canned air" which is actually R134A. When it shuts down, turn the can upside down and spray the sensor. (Upside down sprays out the coolant as a liquid, not as "air", don't spray it on your skin) Wait a couple seconds and try to start it. The 134A will chill the sensor and make it operate, until it heats up again.
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Tuesday, July 14th, 2020 AT 11:35 AM (Merged)
Tiny
BRIAN REES
  • MEMBER
Thank you I will be giving that a try today, will let u know.
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Tuesday, July 14th, 2020 AT 11:35 AM (Merged)
Tiny
BRIAN REES
  • MEMBER
Thank you guys for the help it was the crankshaft position sensor
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Tuesday, July 14th, 2020 AT 11:35 AM (Merged)
Tiny
KEN L
  • ADMIN
Glad we can help, please consider a small donation to help us keep the site going, the link is below.

Best, Ken
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Tuesday, July 14th, 2020 AT 11:35 AM (Merged)
Tiny
MARINOKOHNEN5
  • MEMBER
  • 2003 GMC YUKON
  • 200,000 MILES
Driving for about 45 minutes on fwy. Got off fwy. & Car made a noise (maybe electrical whirl?) For about a minute. Then died. Everything turned off and slowly came to a stop. Tried to start again and it won't crank over. Thought maybe it ran out of gas and put two gallons in. It didn't do anything. Please help!
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Tuesday, July 14th, 2020 AT 11:35 AM (Merged)
Tiny
HMAC300
  • EXPERT
Check battery first for condition an dload test. Auto parts do it fro free
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Tuesday, July 14th, 2020 AT 11:35 AM (Merged)
Tiny
CASHFLOW50$
  • MEMBER
  • 2003 GMC YUKON
  • 4.8L
  • V8
  • 2WD
  • AUTOMATIC
  • 130,000 MILES
My car is the SLE model.
Pulled in garage after dropping my daughter off at her volleyball practice. Took a two hour nap while waiting. After my beauty rest jumped in my ride and started her up. Started like a champ. Started pulling out on reverse and all of a sudden engine just shut off. Started her back up with no problem. What I noticed was the change in idle. On reverse needle on gauge went below 500 rpm. Maybe at 400 or so. It slowly went back to 700 moments later. I then placed her in drive and same thing drop below 400 or so then gradually rises up. What the heck is going on? Dirty MAF sensor? Dirty throttle body? Plugs going bad? Please help. Thank you.
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Tuesday, July 14th, 2020 AT 11:35 AM (Merged)
Tiny
KEN L
  • ADMIN
Hello,

Yes all of the above can cause the problem along with a weak fuel pump, here are some guide that will get us started in the right direction.

https://www.2carpros.com/articles/mass-air-flow-service

and

https://www.2carpros.com/articles/how-to-replace-a-mass-air-flow-sensor-maf

and

https://www.2carpros.com/articles/how-to-use-an-engine-vacuum-gauge

and

https://www.2carpros.com/articles/how-to-change-spark-plugs

and

https://www.2carpros.com/articles/stall-at-idle

Please let us know what happens, we are interested to see what it is.

Cheers, Ken
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Tuesday, July 14th, 2020 AT 11:36 AM (Merged)
Tiny
CASHFLOW50$
  • MEMBER
Thanks for the reply Ken. It was actually the maf. I removed it and the intake tube as well. Cleaned both maf and throttle body with their respected cleaners. After clean idle is back to normal and never drops below 700. I was relieved, because I was thinking it was the TCC solenoid. I was hoping not to drop the trans pan to get to it.
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Tuesday, July 14th, 2020 AT 11:36 AM (Merged)
Tiny
KEN L
  • ADMIN
Nice work, we are here to help, please use 2CarPros anytime.

Cheers, Ken
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Tuesday, July 14th, 2020 AT 11:36 AM (Merged)
Tiny
CASHFLOW50$
  • MEMBER
Hi Ken.

Kind of jumped the gun a little. It was driving fine for a bit, but the dreadful CEL on the dash along with a message stating 'Reduced Engine Power' on dic. I pulled the codes and got P1518 which points to the Throttle Body. Maybe I sprayed too much Carb cleaner in the area and got the wires wet somehow. Going to check the connectors before I buy a new TB.
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Tuesday, July 14th, 2020 AT 11:36 AM (Merged)
Tiny
KEN L
  • ADMIN
Please let us know what happens, we are interested to see what it is.

Cheers, Ken
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Tuesday, July 14th, 2020 AT 11:36 AM (Merged)
Tiny
CASHFLOW50$
  • MEMBER
All connectors pertaining to the TB all good. I shook them and still didnt post any error code(s). Did more research on the P1518 and it could be a bad tac module, which I just ordered. I'll update once I have replaced the part.
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Tuesday, July 14th, 2020 AT 11:36 AM (Merged)
Tiny
KEN L
  • ADMIN
Please let us know what you find.

Cheers, Ken
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Tuesday, July 14th, 2020 AT 11:36 AM (Merged)
Tiny
CASHFLOW50$
  • MEMBER
I installed the tac module yesterday. Took her to work this morning and so far so good. It was fairly easy to remove and install. Hopefully code wont come back. Crossing fingers.
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Tuesday, July 14th, 2020 AT 11:36 AM (Merged)
Tiny
KC11725@AOL.COM
  • MEMBER
  • 2001 GMC YUKON
  • 5.3L
  • V8
  • 4WD
  • AUTOMATIC
  • 143,278 MILES
This just started while driving I went to pass another car I lost power then the truck shut off. It started up, but when you accelerate it bogs down and shuts off again. Whenever you accelerate the truck just bogs down and shuts off all the time, but it will always start back up.
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Tuesday, July 14th, 2020 AT 11:41 AM (Merged)
Tiny
HMAC300
  • EXPERT
Check fuel pressure with a gauge auto parts rent it some of these models had a bad wiring harness by the pump and the connector was replaced as well as about a foot of harness. the new pumps usually come with it.

https://www.2carpros.com/articles/how-to-check-fuel-system-pressure-and-regulator
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Tuesday, July 14th, 2020 AT 11:41 AM (Merged)

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