Engine stumbles

Asked by GuruLBSNJ Apr 04, 2019 at 02:41 AM about the 2001 GMC Sierra 2500HD 4 Dr SL 4WD Extended Cab LB HD

Question type: Maintenance & Repair

2001 GMC sierra 2500 hd 8.1l. Started using it in couple
months ago starts fine at minus 30. Now its 40 above zero
and takes 4 tries to start up. New fuel pump and filter as of
November 18'

2 Answers
9,730

Mike answered 5 years ago

My best guess is the ECT sensor. That's the engine coolant temperature sensor, if you can get it hooked to. Scanner that reads data stream you should be able to read it, when they go bad they usually read -40.

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