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Bucking/chugging under a heavy load (2002 GTP)

G

Green97GTP

New member
it started out just missfiring, under a heavy load, WOT, then it got where its not longer a stutter its like the car dies, then kick in, and dies and kicks in (trying to upload videos) It happens all the time, some worse then other, it also dies all the time, some worse then others.

2002 gtp 114k miles (Prior bbq car)
mods, CAI, 104al plugs, (lots of stuff in a box)


I have New plugs,
newer Taylor wires
3 New Coils
New ICM
new mass airflow sensor
No cat

HELP
(fuel filter still needs to go on)
 
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Stop beating on it like that unless you want to swap the motor. Do you have a rear o2? You could be in cat diagnostic mode.
 
No I have no rear 02 but hell, have not had one for 3-4 months... How do I get it out of that mode? And tbh I'm not worried about rebuilding the motor.
 
Start simple.

Those plugs are way way too cold for only a intake.

Get new plugs, that might solve your misfire issue.

I bet you also have a few engine codes for not having a rear o2 sensor or a cat converter.

The only real way to rid those codes and stop it from ****ing up all of your fueling (because I bet you get crap gas mileage) is to buy a quality cat and get it installed with a new rear o2. A highflow cat is garbage will set it back off again, your going to have to fork over a little extra money to get a good one.
 


i really think its a tps went out of it... it was running great like this about a week ago. 35mpg on the highway its not a missfire at all, no missfire is detected in any scanner. befor. im thinking tps or csps.

i guess i could buy a cat, But this winter i plan to

install
Cam. or roller rockers
SLP headers (already have)
3.4 pulley (already have)
180 t-stat (already have)
104's (already have an installed)
taylor wires (already have and installed)
intercooler.

I guess ill just park it till the build and drive one of my other 15 cars lol. I really think this all has to do with putting ford wheels on my car.
 
I feel stupid, i guess i should also throw out, this car was the one i bought burnt, also my 13th grand prix. and i have did alot of Build work under the hood, just never ran into this problem befor, and i have been running no car/rear o2 since i got the car.. and it didnt use to do this, Im going to buy one with my next check i guess lol.
 


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