Question about 1999 Chevrolet Monte Carlo

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2000 monte carlo ss 3800 series engine sometimes stalls while driving,after putting trans in neutral it starts as soon as you hit the key,no codes come up on the computer either when this happens.

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  • Rob Janicki Dec 08, 2008

    1999 Monte Carlo Z34 engine may hesitate at speed multiple times and continue running or the engine may simply stop running while driving. Speed has varied when this happens. Engine has shut down when both cold and when hot after running for some time. Dealer has replaced spark plugs and wires, fuel filter, air filter, checked fuel injectors and fuel pump, performed tune up and yet no fault codes come up. Dealer has not been able to replicate failure. Does this engine have a timing belt/chain sensor and if it does, could that be faulty thus shutting the engine down while not showing any failure code?

  • Anonymous May 18, 2009

    2000chevy monte carlo ss runs fine cold shuts off after 10 minutes of running

  • Dennis Hanks Sr. Jan 21, 2013

    The crank sensor could be bad.Sometimes they don't show a code

  • Anonymous Mar 23, 2014

    transmission will not go until restart

  • Anonymous Mar 23, 2014

    my 2204 monte carlo stalls sometimes but starts right back up

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I had problems with that too on my 3.8. it is most likely the mass airflow sensor located on the throttle body.

Posted on Sep 24, 2008

  • cfield21 Sep 24, 2008

    it is most likely the mass air-flow sensor located on the throttle body.

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3800's are really good motors, but that's a sign of fuel injector problems. I've seen this all to many times. Run some injector cleaner through it and see if cleans up.

One question however, does it stall out and have a problem restarting? Black smoke out of the exhaust? This is sign of an EGR valve problem that may be fixable simply with a nice cleaning.

I'd try the injector cleaner first, and if it continues, go onto the EGR valve. If this shows no problem, it may be a good time to take the car to a mechanic and have the injectors tested. They may be failing but not giving out a fault indicator.

Posted on Sep 21, 2008

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I believe the codes are emmission related. I would have the fuel pump pressure checked. The fuel filter and fuel pressure regulator seems to be the failrue. The restarting of the engine several times is making the system build up enough pressure to start running . I would take to a shop to have the fuel pressure checked.

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God Bless Greg

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