Grand prix stumbles at 40 miles an hr. when car is cold it runs fine when car heats up problem starts. New plugs wires coils and new cat thanks for any help
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11-07-2017
Grand prix stumbles at 40 miles an hr. when car is cold it runs fine when car heats up problem starts. New plugs wires coils and new cat thanks for any help
11-08-2017
Bad O2 sensor, bad TPS, clean the MAF with approved MAF cleaner. Maybe even remove and clean it up. Any codes showing? Also, what type/brand plugs did you install?
11-08-2017
ac delco wires and plugs same brand that were in the car cleaned the Maf .Do you think may be bad 02 sensor have never changed them 120000 miles on car
11-08-2017
the check engine light on?
11-09-2017
Get a code reader so you can pull any stored codes and watch live data from the sensors while it is running.
11-09-2017
Gets a flashing code p0300 until you get past the 40 mile an hr or let off gas then flashing stops.Only code stored p0300 and some times light only comes on for a second and stores no codes and sometimes car will throw no codes at all when it stumbles at 40.
11-09-2017
Trying to find a scanner that reads live data mine don't advance had one but some one stole it auto zone has the same scanner as mine.
11-09-2017
If it's only when warm my one guess is that the ignition control module starts to act up once some heat gets into it.
Because you've already replace plugs, wires and coils.
11-09-2017
the car feel weak and gut less? if so you got a clogged cat.
Pursell1911 liked this post
11-09-2017
First post says he replaced it.
11-09-2017
well crap
11-09-2017
Forgot to mention that's new also. I do most of my own work I was stumped on this one went to garage he changed the coils and ignition control module no help he always did good by me but left me hanging on this one said it might be a bad injector or something else cant afford for him to keep trying this or that
11-09-2017
Actron CP9575, is the one I have, I actually keep it in the glove box for once in a while I get the po4020 code.
11-20-2017
Update this problem first thanks for all the input. Changed down stream 02 sensor and car has been running great for about a week now also changed upstream sensor a couple days later.Got a new problem now getting a p0054 code after about driving 60 miles at start up cleared code and code came back after 60 miles at a cold start up using remote starter car still running good thanks for any help
11-20-2017
There is either the open/short in the harness to the sensor or the sensor to the harness.
Or the bank 2 sensor is faulty. Those are the most likely causes.
11-20-2017
Thanks sensor is new any way to tell if its a bad one
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