oxygen sensor
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New User
Joined: Apr 2009
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oxygen sensor
I was planning on putting a dual exhaust on my truck. Iwas just wondering if i go with full length headers would the oxygen sensor be fine on the right side or does it have to read from both sides of the exhuast and why would it have to read from both sides. No cat on exhaust and also only has the 1 sensor in front of where the cat was. Just wondering if it would run fine from having it on one side.
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Joined: Apr 2009
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Have you performed/witnessed an install like this before? How do you determine the distance along the header and method of installation? All I have read is :
In order for the O2 sensors to operate properly, they
must be at, and stay at, a minimum temperature. If you place the HEGO O2 sensors farther away from the head than the stock
location, you may have the sensor too far away to keep it hot enough to read correctly due to the cooled exhaust gases. This causes the EEC to enrich mixture and may cause plug fowling. Ceramic heat coating the headers will help maintain exhaust gas temperature. The EEC has a timing table used to time the sampling of the O2 sensors to coincide with the arrival of the latest cylinder exhaust pulse from each bank. Moving the HEGO sensor further away (or closer for that matter) may result in an ill-timed sample, which could also cause improper air/fuel mixtures to occur due to the O2 sensor not sampling when the pulse passes the sensor. One way to compensate for the additional time needed due to adding length in the Long tube headers is to change the timing table with an EEC-Tunerâ or TwEECerâ .
Thanks for the replies...
location, you may have the sensor too far away to keep it hot enough to read correctly due to the cooled exhaust gases. This causes the EEC to enrich mixture and may cause plug fowling. Ceramic heat coating the headers will help maintain exhaust gas temperature. The EEC has a timing table used to time the sampling of the O2 sensors to coincide with the arrival of the latest cylinder exhaust pulse from each bank. Moving the HEGO sensor further away (or closer for that matter) may result in an ill-timed sample, which could also cause improper air/fuel mixtures to occur due to the O2 sensor not sampling when the pulse passes the sensor. One way to compensate for the additional time needed due to adding length in the Long tube headers is to change the timing table with an EEC-Tunerâ or TwEECerâ .
Thanks for the replies...
FTE Legend
Joined: Jun 2006
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From: Ottawa, Ontario
The O2 sensors on these trucks have a built-in heater so that part doesn't apply. The timing thing is technically correct but my experience indicates it's not really a problem since I have had a motor running perectly and passing sniffer tests for over 8 years with a single O2 sensor in the passenger side header collector only.
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Excellent, I have a 1989 F150 4x4 SuperCab, and am considering building true duals, would you be willing to briefly describe any recommended parts/installation issues?
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Lead Driver
Joined: Nov 2002
Posts: 9,557
Likes: 44
From: Concord, NC
The distance from the head applies to some extent, i.e. you can't have the O2 sensor at the muffler. However, the difference in distance from the head between the stock location and the collector of a long tube header shouldn't be enough to cause much, if any, problem.
As far as I know, the computer used in these trucks cannot trim individual cylinder or bank-to-bank fuel trim, so there shouldn't be any worry of throwing off the timing of exhaust pulses.
As far as I know, the computer used in these trucks cannot trim individual cylinder or bank-to-bank fuel trim, so there shouldn't be any worry of throwing off the timing of exhaust pulses.
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