Q: Every three months, catalytic converter and muffler must be replaced

asked by on August 15, 2016

The catalytic converter and the muffler have to be replaced every three months in my SUV. The cause of this is the hydrocarbons that are continually deteriorating them, but I do not know what is causing this problem. Using Bosch products, I replaced the wires and the plugs. Also replaced the EGR with an AC Delco. But not a solution; problem still exists. The catalytic converter becomes clogged up and then will not accelerate very well at all. I’m considering that the only way to go is straight pipe before junking this SUV. Do you have any suggestions of how I can fix this and save this vehicle?

I would start with checking the O2 sensor. This is what relays exhaust gas changes to the vehicle’s computer. When this sensor is not working correctly, incorrect or misdiagnosed air/fuel mixtures are relayed to the vehicle’s computer causing incorrect changes to be made. When exhaust vapors become trapped in front of the catalytic converter, this can also cause a misreading by the O2 sensor resulting in a misreading to the computer. I would recommend having a qualified mechanic, such as one from YourMechanic, come to your home to diagnose the acceleration issue and pinpoint the cause of the catalytic converter problem.

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

What others are asking

Horrible acceleration, horrible fuel mileage, and misfire codes.

Hello. First task is to extract any problem codes, whether the Check Engine is set or not. There are many things that can cause the symptoms you describe: injectors stuck open, or fuel pressure too high, coolant temperature sensor malfunctioning...

truck shakes alot at 60 mph & steering wheel has alot of play

Hello - assuming the tire balancing was done correctly, the shaking issues could be either a bent wheel, a separating tire (tread separating from the structural belts) or an out-of-round tire. All of these conditions can be "balanced" but still...

No brakes

If the brake pedal is going to the floor even after replacing master cylinder and rear brakes you still have air in the brakes. You may need to use a pressure bleeder to push fluid through the system and bleed...

Ran out of gas won't start fuel pump working?

Hey there, thanks for writing in about your 1993 Chevrolet K1500. Keep in mind that just because the fuel pump runs does not mean it produces enough pressure for the fuel injection of the engine. Have the pressure tested to...

Brake pedal height 4 inches too high.

Hi there. There is a lever that is attached to the brake pedal that has an adjustment screw. The screw was pushed out making the brake pedal higher than normal. Turn the screw inward and the pedal height should drop....

Do your radio have something to do with your lights.?

You did not mention if it is inside dash lights or outside lights? Either way an electrical issue would need to have the fuses and switches in the light system checked for proper operation and power to and from them....

Knocking noise from under the hood

Hi, thanks for writing in. There are many possible sources of the knocking noise you hear, especially with the advanced mileage on your vehicle. Most likely are worn connecting rod and crankshaft main bearings (will knock worse if you rev...

Engine squealing when idling

Hi there. A squealing noise is a common sign that the rotating parts such as your belts are slipping on their pulleys. A worn belt will make this noise due to the loss of tension and gripping ability of the...

steering wheel locked up and car shut off while driving, 2009 chevy aveo

Power steering assist relies on engine power to work. Consequently, the hard steering may have simply occurred as a consequence of the engine shutting down. What you are describing is "engine stalling" and the root cause of that problem can...

Related articles

The Best Used Cars to Buy If You’re an Athletic Coach
If If you are an athletic coach, you need a used vehicle with tons of room to transport gear. Once in awhile, you may have to take a player or two along with you as well. What this means is...
How to Buy a Good Quality Exhaust Manifold
The The exhaust manifold bolts to the cylinder head of the engine and pulls exhaust gases from the individual ports; combining them into one outlet to flow back into the remainder of the exhaust system. Exhaust fumes are sneaky, and...
Is it Safe to Drive With an Exhaust Leak?
Your vehicle’s exhaust system keeps the car quiet and the exhaust fumes away from the cabin. Furthermore, the system helps...