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Please help, 99 yukon died on highway

ex10psi

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ex10psi Enthusiast

ex10psi

Posted
Posted

hey guys, i did a bunch of searching but unable to narrow down my problem.

 

tonight, driving home from work my 99 yukon just died... i was doing about 65mph on the freeway and it started to slow down, noticed the rpm was zero and i had my foot down on the gas pedal, it sputtered a bit, as if i was running out of gas. pulled to the side, it would crank but wont fire up. so towed it home and i went to start the truck again and it fires right up! didnt drive it around because i'm scared it'll die again.

 

i should also mention that i got the SES light a couple months ago... it flashed, then stayed on steady, then went away, came back on again when i really load up the truck... climbing hill, towing, will always trigger the SES.

 

and ever since the SES has been coming on... the truck sputters and hesitates a bit climbing incline at freeway speeds in OD. idle is rough at times.

 

the fuel filter was changed about 15k miles ago, i just changed the plugs. when i turn the key to ON position i can hear the fuel pump whine on briefly. i'm guessing it's not the fuel pump because it started up again several hours after it died on the freeway? i know i should read the codes... i need to get a scanner.

 

can anyone please help? thanks a lot everyone!

bigdogxx Enthusiast

bigdogxx

Posted
Posted

First thing i would check is to see if your getting fuel, because imo it sounds alot your like your fuel pump just took a dump.

 

-edit-Maybe i should of read your entire post first sorry :thumbs::banghead::banghead:

bry21317 Enthusiast

bry21317

Posted
Posted

I had a 2000 Yukon Denali, same body as the 1999 with the 5.7L vortec do this to me. What my problem ended up being was a loose distributor cap, that ended up melting itself. Once htis was fixed, it was good to go again.

 

Check the Distributor to see what it looks like. It is a real Pain to get to, but its a very cheap fix if this is the problem.

 

Hope it helps.

 

Bryan

ex10psi Enthusiast

ex10psi

Posted
  • Author
Posted
I had a 2000 Yukon Denali, same body as the 1999 with the 5.7L vortec do this to me.  What my problem ended up being was a loose distributor cap, that ended up melting itself.  Once htis was fixed, it was good to go again.

 

Check the Distributor to see what it looks like.  It is a real Pain to get to, but its a very cheap fix if this is the problem.

 

Hope it helps.

 

Bryan

 

 

 

 

you know, just recently i had the engine jacked up a bit to do a oil pan change out... and what i noticed was the engine had to be jacked up quite a bit and the dist cap towards the firewall seemed to be really close to the firewall there, i was concerned about it actually but didnt think it was knocked loose or damaged, but this is a good idea to check!

 

my question is though... if i did knock the dist cap loose during the engine jacking ordeal for the oil pan, and if being loose the cap melted, would the truck start right up again after a few hours of sitting? i tried starting it again this morning, and even after sitting over night she fires right up as if nothing ever happened. :banghead: i was tempted to drive it to work but instead hitched a ride... thanks.

mhornco New Member

mhornco

Posted
Posted
any more comments please? thanks!

 

 

 

Almost sounds like fuel pump to me. We have a lot of chevies at work and every one now has dumped a fuel pump. Usually happens on a hot day. Truck just sputters and dies on the road. If you wait 20 minutes or so it fires right up again, and may be good for a while. Turns out his has been a common problem for a lot of GM vehicles. I read a lot about it on another forum. My dad had the same problem with his 04 1500 silverado. Truck was fine around town, but on the highway there was a long haul up the mountain, and during a hot day the thing would die on him. He'd wait a bit and the truck fires up like nothing happened. he'd go 20 miles or so then it would happen again. The dealer told him they had replaced a lot pumps already

sub5 Enthusiast

sub5

Posted
Posted
any more comments please? thanks!

 

 

 

Almost sounds like fuel pump to me. We have a lot of chevies at work and every one now has dumped a fuel pump. Usually happens on a hot day. Truck just sputters and dies on the road. If you wait 20 minutes or so it fires right up again, and may be good for a while. Turns out his has been a common problem for a lot of GM vehicles. I read a lot about it on another forum. My dad had the same problem with his 04 1500 silverado. Truck was fine around town, but on the highway there was a long haul up the mountain, and during a hot day the thing would die on him. He'd wait a bit and the truck fires up like nothing happened. he'd go 20 miles or so then it would happen again. The dealer told him they had replaced a lot pumps already

 

 

 

 

 

My 99 Sub had the pump changed 2 years ago after it died in the driveway and again this winter it went. This time the engine died on the highway. It started again after I had pulled over to the side of the highway. The next 50 miles on the way home it hesitated a few times. The next few days the truck was harder to start so I suspected the pump again. First thing I did to rule out the pump was do a pressure test . Bingo fuel pressure was borderline so if it droped a few psi it would hesitate or stop running. All that said I replaced the fuel pump but this time no OEM part. Found a replacement pump from VENOM PERFORMACE Inc. which runs qiet, cooler and more output. I can stand next to the truck while pump is running and can hardly hear it. Pump was cheaper then OEM part by the way.

 

Cheers

John

ex10psi Enthusiast

ex10psi

Posted
  • Author
Posted

thanks for the help guys... i havent had time to take a closer look at it but this morning she fired right up again.

 

but i didnt drive it to work, i hitched a ride with my wife in her 1988 honda civic that's still on the original fuel pump. i hate that d**n civic but at least it runs.

 

i'm going to autozone tonight to pick up a code reader (i've had SES light on for a while now too).

 

how much work is it to drop the fuel tank and replace that d**n pump?

sub5 Enthusiast

sub5

Posted
Posted
thanks for the help guys... i havent had time to take a closer look at it but this morning she fired right up again.

 

but i didnt drive it to work, i hitched a ride with my wife in her 1988 honda civic that's still on the original fuel pump. i hate that d**n civic but at least it runs.

 

i'm going to autozone tonight to pick up a code reader (i've had SES light on for a while now too).

 

how much work is it to drop the fuel tank and replace that d**n pump?

 

 

 

 

Since it was winter and -20f outside I did mine at my mechanics shop with him. We had the pump replaced within 2hrs but I had only 6 or 7 gal. of gas in it and it's a 40 gal. (US) tank. It's a lot easier on a lift and with a support jack for the tank at a garage. But you need to read your code first in case it's not your problem. good luck.

 

Cheers

John

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