Exhaust Leak at collector, AFR misread

86ESSR

Member

Nov 14, 2019

2

1

13

Chicago

Nov 18, 2019

#1

• Nov 18, 2019

• #1

Last night i replaced my cheap header gaskets with some Percy's multi layer aluminum gaskets. Those suckers sealed right up but i noticed that i now have a small exhaust leak at the collector side after loosening them to get more room for the gasket install. Today i drove the car and my air fuel ratio gauge went into the 18 - 20s. Will a leak at the collector throw off the 02 sensor like that to cause it to read that lean?

86 Mustang
408w

 

90sickfox

Wasn't a pretty sight...and I've got big hands

SN Certified Technician

Mar 2, 2015

6,945

5,816

213

Nov 19, 2019

#2

• Nov 19, 2019

• #2

An exhaust leak can cause lean readings due to extra air in the exhaust.

 

R

Rcdgl

5 Year Member

Feb 19, 2018

313

168

63

Nov 27, 2019

#3

• Nov 27, 2019

• #3

I think I am also learning this too.

 

KZGUNS

I can swing up to 11”

5 Year Member

Jul 23, 2018

1,002

588

133

chardon, Ohio

Nov 29, 2019

#4

• Nov 29, 2019

• #4

Yes. I somehow lost a collector bolt while driving and my arf readings went right to 18-20

 

a91what

SendMeUrDataLog

10 Year Member

Apr 6, 2011

10,739

6,721

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Hillsborough county

Nov 29, 2019

#5

• Nov 29, 2019

• #5

Absolutely, this can be a real headache.. I do alot of remote tuning and small issues like this can drive you crazy

 

Reactions: General karthief

General karthief

wonder how much it would cost to ship you a pair

20+ Year Stangneter

Aug 25, 2016

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polk county florida

Nov 29, 2019

#6

• Nov 29, 2019

• #6

a91what said:

Absolutely, this can be a real headache.. I do alot of remote tuning and small issues like this can drive you crazy

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That would be a short trip for me!