89 gmc 2.5l


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


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


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


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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