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10-23-2011
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
10-23-2011
does the SES flash at all?
And I kinda wanna take a guess at saying maybe your cat is clogged with how bogged down it get beyond 1/2 throttle.
10-23-2011
I dont think it does what does the ses stand for? (new pontiac owner) and you would think o2 sensors with the o2 sensor codes
10-23-2011
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.
10-23-2011
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.
10-23-2011
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
10-23-2011
just check to see if its flowing before you buy a new cat
10-23-2011
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
10-23-2011
pull the front 02 out and take it for a drive and see if its better.
10-23-2011
^^^this will probably be the easiest/fastest test
10-23-2011
sigh
or what I said, but listening is just too hard nowadays.
10-23-2011
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.
10-24-2011
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
10-24-2011
i unplugged the top sensor and it didnt change the car at all
10-24-2011
As in removeOriginally Posted by TheOtherNick
10-24-2011
ohhhh lol okay...and it should run better? and if it does then what?
Last edited by 20grandprix00; 10-24-2011 at 04:06 PM.
10-24-2011
I took it out and no difference still doing the same thing...
10-24-2011
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.
10-24-2011
fuel is getting enough pressure...im takin the cat off tomorrow and gonna see what happens
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