Car starts then stalls, have to keep foot on gas

Asked by May 13, 2016 at 03:59 PM about the 1997 Pontiac Grand Prix 2 Dr GTP Supercharged Coupe

Question type: Maintenance & Repair

I have a 97 Pontiac Grand Prix gtp. My car starts
then stalls, I have to keep my foot on the gas to
drive around and if not it dies. Codes came up for
mass air flow sensor, and throttle body position
sensor, replaced them and car still does the same,
then I checked the map sensor and noticed the
plug was destroyed, I fixed the plug and replaced it
with a new one, codes came up for a pcv valve, so I
replaced that with a new one and car is STILL doing
the same thing, also my mechanic said my super
charger is on its way out, now that's the 1st one I
had to buy for him to put in, he said he put marval  
mystery oil in it and now says the ball bearings r kn
it's way out, can I just buy the ball bearing kit off
eBay and replace them?

4 Answers

83,435

Did you clean and reset the air rate after you put in the new parts? You should also reset the ECM so it can relearn the base settings. As far as the super charger, don't just patch it by replacing the nose bearings, get the entire overhaul kit and do it right, if the rest of the super charger is good.

How would I reset the air rate?

83,435

Remove the IAC unit and clean those passages and make sure the IAC still moves and is not stuck, then reinstall the IAC start engine and bring to operational temp, shut it off disconnect the IAC connector, start engine and let it try to idle in park, it should be about 500 rpm, if not then remove the little brass plug, see pic, and slowly turn the screw until you reach 500, shut off engine reconnect the connector clear the code that was set by disconnecting the IAC, Set the park brake and block the wheels, put you foot on the brake, start engine and put in drive and turn on all electrical systems fan headlights radio etc, let idle stabilize for about 1 minute, shut it all down. That's it. This is assuming that you don't have any vacuum or unmetered air leaks. HTH

3,635

As far as your supercharger goes it is highly unlikely that it is on its way out or anywhere else for that matter, particularly if it has already been replaced once. They rarely fail because there is really nothing going on in there other than a couple of bearings spinning around in synthetic oil in a sealed system. Lots of superchargers get replaced because the coupler goes and makes noise and those not in the know decide its the supercharger at fault. While they're at it they replace the coupler as well so the noise goes away and they think they've done the right thing. Of course lubricating it with something other than the factory recommended synthetic oil could cause a failure if the replacement oil is inferior to the factory lubricant. If you read your owners manual you will discover there is no maintenance schedule for the supercharger other than checking the oil level. It is basically a maintenance free device which is one of the reasons superchargers are so awesome.

Your Answer

Add photo

Related Questions

  • Car keeps stalling 2 answers

    I have a 2004 Grand Prix it keeps stalling out does anyone no what it could be

    2004 Pontiac Grand Prix

    -

    Maintenance & Repair

  • Car will sometimes not start after warm. 46 answers

    When i start my car, for the first time during the day- I have no problem. When I go somewhere and shut it off, sometimes it won't resatrt. It doesn't seem to matter what the weather is outside, it ju...

    1999 Pontiac Grand Prix 2 Dr GT Coupe

    -

    Maintenance & Repair

  • Pontiac Grand Prix stalling, gas depleting quickly, and car won't start 1 answer

    My Pontiac Grand Prix (unsure about the G) was stalling really bad while I was driving. Lately, when I start the car, it cuts on by the rpm is at 0. Now, the gas has been running out and the car wo...

    2004 Pontiac Grand Prix GT1

    -

    Maintenance & Repair

  • radiator replacement not starting 3 answers

    i replaced my radiator and it will start but will not idle. I have to keep on the gas or it will stall.

    2002 Pontiac Grand Prix GT

    -

    Maintenance & Repair

  • Stalling 8 answers

    Pontiac 6000 1988 46,000 oringinal miles only one owner clean as can be car everything is brand new but it sat for a bit before we bought it. Stalls constantly can't drive it without keeping my foo...

    1988 Pontiac 6000 LE

    -

    Maintenance & Repair

Grand Prix

Looking for a Used Grand Prix in your area?

CarGurus has 3,715 nationwide Grand Prix listings starting at $879.

ZIP:

Search Pontiac Grand Prix Questions

UK Questions

Are you a UK consumer? CarGurus now has a discussion forum in the UK.

Pontiac Grand Prix Experts

#1 Js08016
Js08016
Reputation 3,890
#2 Tom Demyan
Tom Demyan
Reputation 2,580
#3 munron
munron
Reputation 2,060
View All

Related Models For Sale

Used Chevrolet Impala
904 Great Deals out of 35,275 listings starting at $1,700
Used Pontiac Bonneville
8 Great Deals out of 646 listings starting at $1,375
Used Chevrolet Monte Carlo
18 Great Deals out of 1,692 listings starting at $2,491
Used Pontiac Grand Am
1,661 listings starting at $1,298
Used Chevrolet Malibu
1,133 Great Deals out of 82,881 listings starting at $2,328
Used Chevrolet Camaro
401 Great Deals out of 40,631 listings starting at $3,500
Used Ford Mustang
534 Great Deals out of 42,736 listings starting at $1,699
Used Buick Regal
150 Great Deals out of 11,598 listings starting at $1,850
Used Jeep Grand Cherokee
907 Great Deals out of 66,336 listings starting at $1,500
Used Nissan Maxima
381 Great Deals out of 24,382 listings starting at $999
Used Nissan Altima
1,072 Great Deals out of 82,591 listings starting at $1,988

Used Cars For Sale

2008 Pontiac Grand Prix For Sale
13 Great Deals out of 473 listings starting at $900
2007 Pontiac Grand Prix For Sale
518 listings starting at $2,995
2006 Pontiac Grand Prix For Sale
3 Great Deals out of 630 listings starting at $2,000
2005 Pontiac Grand Prix For Sale
439 listings starting at $5,900