GM-4-LIFE Posted June 23, 2012 Report Posted June 23, 2012 Car has a 3.1 in it. Was running perfect and was driveing down the road when it just died. It has spark and fuel pressure. What could.be wrong? It turns over but wont start Quote
ManicMechanic Posted June 23, 2012 Report Posted June 23, 2012 You're sure it has enough fuel pressure? How did it die? Just shut off or sputter? Nice GMC by the way! Quote
GM-4-LIFE Posted June 23, 2012 Author Report Posted June 23, 2012 Thanks. It just died while driveing. It sprays fuel out of the test fuel thing so I guess.it.has enough fuel pressure Quote
ManicMechanic Posted June 23, 2012 Report Posted June 23, 2012 Not always. You will need to do a fuel pressure test to be sure. Quote
GM-4-LIFE Posted June 23, 2012 Author Report Posted June 23, 2012 How do you do a fuel pressure test? Quote
GM-4-LIFE Posted June 23, 2012 Author Report Posted June 23, 2012 Also.the car has had very low voltage lately court that have damanged the coils? Quote
ManicMechanic Posted June 23, 2012 Report Posted June 23, 2012 Do you have a Harbor Freight near? You can either buy a tester there for about $20, or rent one from another auto parts store. They're pretty simple to use, you attach it to that valve - being careful of course because you are working with gasoline - and check the pressure after cranking then engine a few seconds. I can't recall off hand what it should be, I want to say 35-40 PSI. Another possibility is a out-of-spec fuel injector. They should be around 12.7 volts for each and checked using a voltmeter. Unfortunately, on a 3.1, most of the injectors are under the plenum and that will have to be removed to check them. Quote
ManicMechanic Posted June 23, 2012 Report Posted June 23, 2012 Also.the car has had very low voltage lately court that have damanged the coils? I doubt it. But you can use a timing light to check for spark at all three coils. Usually if it's the Ignition Control Module or Crank Position Sensor, there won't be any spark. Quote
RobertISaar Posted June 23, 2012 Report Posted June 23, 2012 43.5PSI with no vacuum going to the FPR. could connect the test wire to 12 volts and force the pump on for however long it's needed for testing. Quote
GM-4-LIFE Posted June 23, 2012 Author Report Posted June 23, 2012 Its the fuel pump. I sprayed gas in the intake and it fired up Quote
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