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2000 Grand Prix GT HELP

2

20grandprix00

New member
Okay I have a 2000 Grand prix gt 3800 series II. Runs great but when you drive and press the pedal too far down it wont go. you cannot gun it. You have to baby it up to speed which really makes people behind me pissed. Ran 3 codes. PO131 PO134 and then multiple missfire. The Codes are with o2 sensors. 1 was already replaced. Please help me out guys it would be greatly appreciated. Thanks guys
 


service engine soon, check engine light


Well what do the o2 sensors do?

They monitor your emssions and air and fueling. So in turn they monitor the effectivness of your cat converter.

Go grab a pressure gauge and take the upper o2 sensor out and screw the pressure gauge in its place and start the car, if the pressure gauge read more than 1-2 psi your cat is clogged.
 
You may have too much back pressure, making the engine work harder.
Dont drive it if the ses light is flashing... its damaging your 02 and cat.
 
Yes the service engine soon light is on..but then itll turn off sometimes and wont turn back on for quite a while maybe a day or two....Im gonna check the sensor behind the cat later and then i might just go buy a new cat also
 


Im going to try and replace the o2 sensor tomorrow and hope to god that it fixes it..Worse case senario i go get a cat from summit racing for $50
 


and what exactly happens when you "gun it". does it bog down or does the motor stumble (like a real bad misfire). do plugs and wire.
 
replaced o2 sensor behind the cat and it did not fix it...top one was replaced already...im going for clogged cat...when i gun it it bogs down a little and acts like a bad misfire yes
 


here is what needs to be checked
-fuel delivery
-air delivery
-flow (as in exhaust)
-sufficiant spark to ignite the fuel
now when you figure that out^^^good luck finding what is causing that problem
ex. there are many sensors that can effect air/fuel problems.
 
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