Car cranks over and shuts off

Asked by Jul 04, 2016 at 10:42 AM about the 1999 Chevrolet Malibu LS

Question type: Maintenance & Repair

Car was running fine then my sister in law
borrowed for a few days and it stopped running
she put gas in it and it still wouldn't run, Now we've
changed the fuel filter,  still nothing. Bought a fuel
pump thinking that's it but haven't replaced it. I had
a friend from work check it out he says when you
turn the ignition to "on" he hears the fuel pump
running. He doesn't think it's the fuel pump
because fuel comes out of the end of the line
under the hood but doesnt come out with good
pressure.  He thinks maybe it's the fuel injectors
some aren't working and some are. My brother in
law says maybe it's the fuel pressure regulator
which is easier to fix. We bought starting fluid too
to double check opened air intake sprayed some in
cranked it still nothing. Any advice on what could
be the problem here?

2 Answers

11,385

First without a gauge check of fuel PSI...pressure at the fuel rail "hearing" it means nothing. Next it's NOT the pressure regulator if starting fluid causes no effect. Check for ignition spark the same signals to the PCM (computer) that trigger injection pulse also control ignition firing (spark) and timing..Scan it for DTC codes.

1 out of 1 people think this is helpful.
4,765

This may be the dreaded antitheft security system. Look for a picture on the dash when this happens that says SECURITY or a picture of a car with a lock through it. This a visual indication that something in the car's antitheft system is failing. In most GM cars and trucks there is a hidden system that most people are unaware even exists. From the moment you put your key in the ignition, there begins a constant line of communication between your key's security chip or transponder, to the ignition's lock cylinder, and then to the car's TDM (Theft Deterrent Module). These 3 parts are in CONSTANT communication. If the key is in the ignition, then these parts are sending signals to each other. The security light illuminates when that signal gets broken, or not seen at all. When the communication breaks, the car misinterprets this as an attempt at theft and goes into antitheft mode. (like it thinks it's being hot wired) The car shuts down because it is not getting that signal from YOUR specific key. This is why the security light turns on and shuts down your vehicle. It will either turn off the starter, or the fuel injectors. The vehicle may run for 2-3 seconds before shutting down. This link explains it pretty well. http://www.diy-gm-security.com/ http://newrockies.com/

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