T b i

David Morgan II

Asked by Jan 18, 2016 at 05:15 AM about the 1994 GMC Sierra 1500 C1500 SLE Extended Cab LB

Question type: Maintenance & Repair

What makes my tbi spray steady and constant
Pours gas into intake! Fouling plugs in short order.

2 Answers


That would be the 2 injectors that should be spraying a nice cone shape spray, with no droplets of gas dripping from the injectors. Let me know what it looks like.


So it is either a short to ground in the injector wiring or a bad injector driver in the ECM, unplug the ECM, then see if the injectors still spray fuel when you turn the key on, if they don't then it's the ECM if they do then it's the wiring.

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