2003 yukon denali stalls while driving on highway


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2003 yukon denali stalls while driving on highway

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Auto Repair Home>> Automotive Repair>> Engine Troubleshooting

jasonstuckey
New User

May 2, 2010, 10:07 AM

Post #1 of 3 (3795 views)

2003 yukon denali stalls while driving on highway	Sign In

2003 Yukon Denali stalls while driving 70miles an hours and will not restart. Have new battery and previously had a full diagnostics done about two month ago, all checked out ok. Truck turns over, but will not start.
Two months ago truck would not start. Truck would turnover and start for split sec and died. Had truck towed to shop, next day truck started right up. Shop ran full diagnostics no problems found. Not sure if problems are related, need help.

THX

Tom Greenleaf
Ultimate Carjunky / Moderator
Tom Greenleaf profile image

May 2, 2010, 2:29 PM

Post #2 of 3 (3791 views)

Re: 2003 yukon denali stalls while driving on highway	Sign In

This suggests when the shop got it that it plain behaved so testing could easily say everything is fine. Fuel pressure could be up and quitting on you but would need to test it while acting up for pressure, holding pressure. Also if you get no reaction and don't have a fuel pressure gauge yet, try starting fluid down throttle and if that makes it fire up you have a fuel issue. If no reaction test for spark,

T

Sidom
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Sidom profile image

May 2, 2010, 5:15 PM

Post #3 of 3 (3784 views)

Re: 2003 yukon denali stalls while driving on highway	Sign In

It's always tough when the truck isn't acting up.....

From what you describe it really sounds like you may have a fuel pump going out. Just the fact that it spuddered a couple of times after it died sounds like it was running on what little pressure was left in the rail....

One backyard trick to check a pump is to bang on the tank with a chunk of wood or rubber hammer. If it starts then it's a bad pump. The banging breaks the dead short so the pump will work... I've had trucks that get moved around enough during the tow that they start in the parking lot when they're dropped off.....

It's a tough call and I definitely wouldn't replace the pump just off those facts but I would look hard at it. Current ramp it and if the amperage was low enough and pattern looked bad enough then maybe, if I couldn't get it to die throughout the day to confirm a bad pump.

(This post was edited by Sidom on May 2, 2010, 5:16 PM)

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