Question about 2000 Pontiac Montana

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I have 3400 eng. runs fine until you hold the pedal down to pass a car then it loses all power and then you get a check engine light code then reads o2s and thats all I've replaced o2s, fuel pump,fuel filter, fuel regulator and catalatic converter .nothing has helped.And even setting still in park hold the pedal to the floor engine bogs down. ACTRON SCANNER live data reads fuel loop 1 & 2 open any suggestions ?

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  • 78 Answers

I've seen a similar situation and it turned out
To be a dirty air filter,
Although this may not be the case here,
It's a relatively cheap part and one that may need to be crossed OFF
In the process of elimination!
Cheers Frank

Posted on Jul 20, 2017


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SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

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Posted on Jan 02, 2017

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SOURCE: No power accelerating or going up a hill


Posted on Feb 03, 2009

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SOURCE: I have a 1997 Pontiac Grand Prix GTP. Recently put

If you replaced the fuel pump then there is a possibility that during the job then some debris from the tank and/or filter got loose somewhere into the fuel system and is in your lines. It could even be a very tiny speck of gasket material, old or new.

Posted on Jun 20, 2009

  • 107 Answers

SOURCE: Fuel problems

t.p.s. censor

Posted on Jul 20, 2009

  • 6 Answers

SOURCE: I have a 1997 Pontiac Grand Prix GTP. Recently put

Having the same problem with mine, have yet to found out the cause but I too suspected the fuel pump resistor. I have read about some people having luck with a procedure that sets the fuel pump speed relay to High (Fuel Pump Resistor Bypass 97-00 GTP). You can find it here

Posted on Sep 13, 2009

  • 1608 Answers

SOURCE: 260,000km Car looses power and

Did you do anything to repair the mas air flow sensor code or did it go out by itself?If you did not replace it or clean it you should get some mass air flow sensor cleaner and clean it out.You can get this at most part stores.If you are getting this code then you need to repair this problem.This will cause the car to loose power and it can be intermittent.Hope this helps.Good luck.Let me know if you have anymore questions.

Posted on Sep 21, 2010

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