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Dying, not starting after it's been warmed up. Runs beautiful on cold engine. Replaced plugs, wire, cap, rotor and crank position sensor, no luck.

Backfires too, dies when running anywhere from 20-50 mph without notice. Sometimes still running, but no power when I step on gas (no rpms). Fuel pump also has been replaced.

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  • Jeff Armer Mar 27, 2015

    What year make an model vehicle do you have ? They haven't used cold start injectors for years , The engine computer turns on the fuel injectors for a little time ,till it sees it's warming up

  • Denise Lange
    Denise Lange Mar 27, 2015

    1997 Jeep Grand Cherokee TSi

  • Jeff Armer Mar 27, 2015

    Hold the gas pedel down a little an see if it starts then !

  • Denise Lange
    Denise Lange Mar 27, 2015

    I have, still won't start. Can smell fuel as if it's flooded. Once while under power and trying to stall I could smell sulpher. Could catalytic converter be the cause?

  • Denise Lange
    Denise Lange Mar 27, 2015

    It basically starts when it's just good and ready to.

  • Jeff Armer Mar 27, 2015

    Oh a car with a mind it's own lol !!! No i won't think cat would just when hot , a plugged cat would be the same cold !

  • Jeff Armer Mar 27, 2015

    What did the dealer say ?

  • Jeff Armer Mar 27, 2015

    maybe timing is off ! worn timing chain , dist.

  • Denise Lange
    Denise Lange Mar 27, 2015

    Because it's not throwing codes the dealer thought is was the CPS as well. I know now after replacing it today that it's not the problem. I'm gonna pull the air mass flow sensor tonight and clean it and see if it makes a difference.

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  • Cars & Trucks Master
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Mass air flow sensor could be bad , coolant temp. sensor , O2 sensors. Need to have it hooked up to a diagnostic scan tool that can reads engine computer data ! , how many miles on it ? do you have a check engine light lit on the dash ? Back firing would make me take a good look mass air flow sensor data . GM MAF Sensor Testing Part 1 doesn't always set codes ! MAF Test part 1

Posted on Mar 27, 2015

  • Denise Lange
    Denise Lange Mar 27, 2015

    Coolant sensor also replaced a few months ago. Was at dealership today and it wasn't throwing any codes. Mileage is about to turn over to 200,000. Check engine light does not come on when having problems.

  • Jeff Armer Mar 27, 2015

    A car with a mind of it's own lol !

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  • Contributor
  • 23 Answers

Your car cold start valve puts more gas into the system keeping your engine running higher RPM. When you car warms up, the cold start valve will stop working and your car RPM will drop. What you could have is a vacuum hose disconnected which puts more air into your engine - therefore when you press on the gas pedal, your engine would shut off or you find lack of power and then shut off.

Posted on Mar 27, 2015

  • Denise Lange
    Denise Lange Mar 27, 2015

    Thank you, I will check that.

  • Jeff Armer Mar 27, 2015

    It would need to be a very large vacuum leak to cause this problem ,

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  • Cars & Trucks Master
  • 10,875 Answers

Change the oil,did someone put cornstarch in your oil??,that will make it shut down when warm

Posted on Mar 27, 2015

Testimonial: "Oil has been changed recently. This started prior to oil change."

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