89 gmc 2.5l

60

Asked by Sep 26, 2016 at 04:40 PM about the 1989 GMC Sierra

Question type: Maintenance & Repair

Put a new injector in my 89 gmc 2.5 liter
and its like the injector is stuck open and
dumps way to much fuel when I turn the
fuel pump on. What's causing it

3 Answers

63,355

The only thing that would cause dumping of fuel would be a bad fuel injector,or incorrect timeing.

6,375

Check fuel pressure, the fuel pressure regulator might be bad and creating excessive pressure

90,955

AAHH the infamous grounded injector driver in the 2.5 engines, I can't remember just how many of these I fixed in my years but every one except the one that burned itself up had a shorted injector driver in the ECM. replaced the ECM and they start and run as they always did.

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