Question about exaust leaks

[dsmoverboosted]

Can exaust leaks in an exaust manifold cause an engine to shake? Also would the o2 sensor read lean and add more fuel?

 

[Mr Peepers]

No, but a shaking engine can cause exhaust leaks. The O2 sensor reads the proportion/ratio of oxygen in the exhaust stream, not the "actual" amount. So no, an exhaust leak will not affect the O2 readings. Not unless it's a big enough leak that no exhaust is left to pass over the sensor

 

[tenn-gsx]

Actually if there is a leak prior to the o2 sensor it can cause it to read lean. Why do you think guys with a cracked manifold have bad o2 readings? A leaking exhaust system will allow outside air into the system which contains o2. That extra o2 can effect the readings if it is a big enough leak in the right place.

 

[Mr Peepers]

Wow, I'm sorry. I forgot that it's a pulse and can suck in air too
Thanks for clearing it up tenn-gsx

 

[dsmoverboosted]

accually i messed that up. my trims are at 80% so the o2 says rich and is removing fuel. So would that be possible?

 

[Mr Peepers]

If I can redeem myself, your profile states a rewired 190, but no afpr. You could be overrunning the stock fpr. Do you have a fuel pressure gauge to be sure?

 

[420ANIMAL]

Will a small exhaust leak from the exhaust manifold cause you to lose horspower???

 

[Generation X]

It will cause very slow spool on your turbo.