Can you help to determine whether my problem is with the catalytic converter?
Country: United StatesMake: PontiacModel: Grand Prix GTYear: 2001Engine: 3800
Nothing . . . was going to rent a tester (little hand held code computer, but wasn't sure if it would show the real issue).
I am not sure what you mean by your question.If you are having a running problem and think it may be related to the cat or do you have a check engine light on?
I am asking where you believe I should start with my evaluation. I believe it is the converter, but are there other things I should consider before I remove it?
If the check engine light is on with a P0420 or P0430 code meaning the cat efficiency is defective you need to see if the rear oxygen sensor is responding to an increase when you increase the engine rpm's.If the sensor is not moving then that could be your problem.If the sensor moves then the cat is not working.You can also test the cat with a temperature gun.The cat should pick up heat if it is working.Which means the inlet and exit on the cat should be at least 20 degrees different if the cat is working.Please let me know if you need more assistance,Don
If I replace the catalytic converter is it likely that I should replace these sensors as well?
If the sensors are moving then I would not replace them.
If this does not solve my problems, how do I return to this site to continue?
Just repost and I will as you further,Don
40+ years all makes&models
Replacing the cat converter with a straight pipe made the care run, but it is running rough. I am going to stop tomorrow and rent a hand held code reader. Is this the direction you think I should go?
I would check for any codes in the computer and we can see just what is causing your rough running.I will be here most of today so when you get your codes just get back to me and we can go from there,Don
Working today, so will be doing this after 4 p.m. ty
I will not be here after 3 CDT but I will get back to you in the morning,Don
If I have time on my lunch I will run the codes and email you right away.
I will be here when you need,Don