Engine Tune Up Questions

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Feb 22, 2023 | 10:39 AM

#31

PulpFriction

Senior Member

Joined: 12-05-2014

Posts: 3,368

From: Northern Ohio

Quote:

Originally Posted by rose359

1) The exhaust is loud. Could a bad O2 Sensor be causing the exhaust to be loud?

No. But an abnormally loud exhaust is a leak. If the leak is upstream of the O2 sensor, the computer can draw faulty conclusions about the a/f mixture. All leaks in the exhaust system are hazardous and should be fixed, but leaks upstream of the O2 sensor will cause engine problems, too.

If the leak is a broken flex pipe, you may have a bad motor mount, in case no one mentioned that yet.

Last edited by PulpFriction; Feb 25, 2023 at 03:35 PM.

Feb 22, 2023 | 11:00 AM

#32

rose359

Thread Starter

New Member

Joined: 02-05-2023

Posts: 13

From: MN

Quote:

Originally Posted by PulpFriction

No. But an abnormally load exhaust is a leak. If the leak is upstream of the O2 sensor, the computer can draw faulty conclusions about the a/f mixture. All leaks in the exhaust system are hazardous and should be fixed, but leaks upstream of the O2 sensor will cause engine problems, too.

If the leak is a broken flex pipe, you may have a bad motor mount, in case no one mentioned that yet.

I had not yet heard the concern regarding the motor mount. Once we get past our current winter weather, we will be able to get a good look at the whole exhaust system. Thanks for your help!