Skip the auto shop - Our mechanics make house calls

Q: Catalytic converter now won't start

asked by on

I have a Pontiac 2004 grand am. One day the catlitic converter was glowing red hot, so someone from auto zone said it was clogged to cut it off, my husband done that and put a straight pipe and some clamps on it. After that i test drove it and it seemed like it took a while for it to start picking up speed, blue smoke was coming from the tail pipe. I drive it to my dads scared to drive it any further afraid I was going to mess it up worse. I asked around and tried to get people to check it out and they all said they couldn't find a reason that it was doing that. I went to start the car one day and it wouldn't start, or make any sound like it was trying to start. I need help I'm 8 months pregnant and really need my vehicale fixed. Thanks so much for your time.

My car has 153000 miles.
My car has an automatic transmission.

Hi there. The fact that the catalytic converter was glowing red hot does not mean it was bad. Removing the converter completely can sometimes cause more issues with the car, as it effects the sensor readings. The fact that the vehicle is running the way that you described and that the converter was glowing red tells me that the car was either running lean or rich. Most of the time this is a lean condition, which means too little fuel is being delivered to the engine. This is usually caused by a weak fuel pump.

In a case like this, I first check the computer for codes and check the fuel trim readings. I then check the fuel pressure. If that is fine then it may be a sensor problem. If you would like to have this looked at, consider YourMechanic, as a certified mechanic can come to your home or office to diagnose why your vehicle isn’t starting.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: Car speakers won't play

The speakers in your car receive input from the audio amplifier. A failed amplifier or blown speaker could be the cause of your problem. The cause could also be a blown 20 amp radio fuse, wiring issues or a bad...

Q: Transmission leaking from the inside

Hi. The axle seal sits in the transmission where the axle shaft slides in. I'm assuming that is what your mechanic is talking about, or the axle shaft sleeve. In either case, this is a fairly routine repair. First, the...

Q: Driver door won't unlock or lock from the inside and out. We are currently on the outside locked out

The problem sounds like the door latch or door lock is seized and will not let you open the door. You will need to get in through the passenger door and the inside door panel will need to be removed...

Related articles

Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...
What are the Car Pool Rules in Hawaii?
Hawaii is widely regarded as a land of vacation and relaxation, and as such, its scenic roads and routes are far better known than the state’s freeways. But, as with all...
P2428 OBD-II Trouble Code: Exhaust Gas Temperature Too High Bank 1
P2428 code definition A P2428 trouble code signifies that the PCM has detected a problem in the exhaust gas temperature sensor circuit in bank 1, which subsequently contains the number one...