Skip the auto shop - Our mechanics make house calls

Q: Cherry red catalytic converter.

asked by on

Truck lacks power, and exhaust manifold on driver side gets completely red, just timed with timing gun, new wires and plugs, thinking it could be fuel regulator?? It has no catylac converter cut out due to being stopped up just trying not to burn it to the ground. Or 02 sensors ca uses it to do that?

My car has 240000 miles.
My car has an automatic transmission.

Hi there. Usually, oxygen sensors do not cause this problem, but if the oxygen sensor itself is causing the truck to run lean, then that could cause this issue.

If the oxygen sensor is bad, the Check Engine light would come on because of it. GM has a common problem with the fuel pumps going bad or not putting out the proper fuel pressure, causing a lean condition in the fuel system that makes the exhaust glow red.

Sometimes, the fuel pressure regulator can cause problems as well and it is a cheaper fix than a fuel pump. You can start with changing the fuel pressure regulator and seeing if that fixes the issue. From my experience, the fuel pump is the cause of this problem and needs to be replaced.

If you need assistance, get a certified technician, such as one from YourMechanic, to replace the oxygen sensor, the fuel pressure regulator, or the fuel pump for you.

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: Idles good but cuts out when trying to drive it normally.

There are a couple of ways to go about this and a few things have to be checked. The fuel system must be checked for the proper pressure going to the engine. The ignition system should be checked for its's...

Q: Replaced fuel pump in tank. But still no gas getting to carb. Gonna check filter under bed in morn to be sure it's working

With a fully charged battery, if the pump volume and pressure at the tank outlet is normal, but pressure falls off at the delivery point (carburetor, fuel rail), there is a restriction somewhere in the line and/or in the fuel...

Q: How much should it cost to replace a fuel pump relay?

A fuel pump relay will typically cost about $25 for the part, and a mechanic may charge a minimum of an hour's worth of labor to replace it. The vehicle not starting may be a fuel pump or relay along...

Related articles

How Do Power Car Windows Increase Passenger Safety?
Power windows are responsible for approximately 2,000 emergency room visits every year. When a power window closes, it exerts enough force to bruise or break bones, crush fingers, or restrict an airway. Though...
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...
P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the...