Fuel Injector Stuck

[MyrtleBeachFord]

If a fuel injector is stuck open, will it cause the the fuel to be too rich, causing heavy black smoke out of the tailpipe during acceleration?

Jeff

 

[MrShorty]

Possibly, yes. Of course there several other possible causes of heavy black smoke out the tailpipe during acceleration. More common than a stuck open injector is a fuel pressure regulator (FPR) with a ruptured diaphragm allowing unmetered fuel into the intake. If the fuel pressure is too high (from a stuck FPR), that will cause it to run rich like that, too. Diagnosing these kinds of fuel system problems starts with a proper fuel pressure test (see the sticky at the top of the Under the Hood forum).