Skip the auto shop - Our mechanics make house calls

Q: Was told I needed to replace the catalyst converter, now car won't start at all help? ??

asked by on

We had it towed to a guy that did work on it before for us with the new catalyst converter in box brand new. He said he cut into the pipe in front of the catalyst converter an it was still making the pipe red hot... Next thing I know the car won't start so they replaced the starter, an spark plugs. The car still won't start they have had it over a week so I said at this point I'm done bring it back. Supposed to be towed back today... anyone have any ideas on what to do next? ??
My car has 150000 miles.
My car has an automatic transmission.

The engine may be having an issue with the crankshaft sensor and crankshaft damper. The sensor may be the reason of the no start. The crankshaft damper is known to come apart and could damage the sensor behind it. I recommend you have your engine checked for proper spark and fuel pressure. If you lost spark then the crank sensor may be the cause. If you lost fuel pressure then the fuel pump and filter may be bad. The reason the pipes turn red hot is because of two possible things that can cause it. The catalyst converter is clogged or the engine is getting too much fuel and what the engine cannot burn ignites in the exhaust and turns the pipe red hot. The exhaust can be checked by disconnecting the pipe and see if the engine starts. The fuel pressure too high can cause the excessive fuel in engine. The best recommendation is to have a certified mechanic like one from YourMechanic come and diagnose why your car will not start.

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

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!
  • Home
  • Questions
  • Was told I needed to replace the catalyst converter, now car won't start at all help? ??

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: Why is my car is real slow to accelerate?

This may be related to a few different things, such as low fuel pressure, dirty or faulty fuel injectors or potentially a dirty or failing mass air flow sensor. Low fuel pressure can cause the injectors to not receive...

Q: Creaking noise from the rear struts

You should have the suspension checked to make sure the noise is something that is not broken and is still safe to drive until you can get the part replaced. This way you are being safe.

Q: Heater blower

If the blower motor does not respond to on and off commands at the switch, generally the switch is faulty. The turn signal issue is probably not related to the problem with the blower. If you hear the flashing unit...

Related articles

What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...
How to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...