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#1 |
Registered User
Join Date: Sep 2009
Location: Visalia, CA
Posts: 247
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Exhaust Cross Pipe with O2 Sensor
Hey guys. Is an exhaust cross pipe necessary in order for the O2 sensor to operate correctly? The mechanic told me that my truck is running rough because the O2 sensor needs to be able to read both sides, so he said that I need to put in a cross pipe and place the O2 sensor in the middle. My O2 sensor is currently on the passenger side just below the flange.
My truck is a 70 with a 5.7 L engine from a 90 chevy silverado. Thanks for the help! |
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#2 |
Just a car guy
Join Date: Feb 2006
Location: New Washington, IN
Posts: 991
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Re: Exhaust Cross Pipe with O2 Sensor
No. 3rd gen camaros had them in the drivers side manifold.
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1955 belair Blown Pro Street cruiser 1971 Camaro Pro Touring 1973 Vega Drag Car 1970 C20 tow rig |
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#3 | |
Registered User
Join Date: Jun 2011
Location: Green Cove Springs FL
Posts: 194
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Re: Exhaust Cross Pipe with O2 Sensor
Quote:
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#4 |
Registered User
Join Date: Sep 2009
Location: Visalia, CA
Posts: 247
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Re: Exhaust Cross Pipe with O2 Sensor
Thanks guys. Anyone else have thoughts on this? Anyone agree with the mechanic?
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#5 |
Registered User
Join Date: Aug 2009
Location: St. Paul MN.
Posts: 1,996
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Re: Exhaust Cross Pipe with O2 Sensor
My 90 k1500 has only one 02 in left exhaust pipe he is wrong
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Fuzzy |
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#6 |
Registered User
Join Date: Sep 2009
Location: Visalia, CA
Posts: 247
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Re: Exhaust Cross Pipe with O2 Sensor
Thanks HayHauler. Is your O2 sensor located after the y pipe? I have true dual exhaust straight back with no y pipe or cross over.
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#7 |
laying low
![]() Join Date: Mar 2001
Location: Searcy, Ark. USA
Posts: 13,267
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Re: Exhaust Cross Pipe with O2 Sensor
No disrespect to your mechanic but he needs to pay attention to where the factory mounted them. 90 models were, as noted, up close to the manifold on one side. 02 sensors have to heat up to work proper so mounting them further down the exhaust pipe would give a negative effect.
Your 02 sensor may not be your trucks problem.
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Boog 69 Chevy stepside, 358/T350, 4.11 posi, 4.5/4 drop, rallys, poboy driver primer is finer 91 Chevy sportside, Tahoe, Yukon & GMC Crewcab All GM..'nuff said. I stand for the flag and kneel at the cross |
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#8 |
Registered User
Join Date: Sep 2009
Location: Visalia, CA
Posts: 247
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Re: Exhaust Cross Pipe with O2 Sensor
Thanks Boog. Don't worry about disrespecting my mechanic. It was the first time I went to him and won't go back. He disrespected me by wanting to charge me $2,400 for a front end rebuild!
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#9 | |
Registered User
Join Date: Oct 2010
Location: Largo Florida
Posts: 632
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Re: Exhaust Cross Pipe with O2 Sensor
Quote:
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Lifes journey is not to arrive at the gate well preserved, it is to slide in sideways all used up and wore out yelling.....God what'a ride! Where patience fails, force prevails Stapp's Ironical Paradox "The universal aptitude for ineptitude makes any human accomplishment an incredible miracle." |
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#10 |
Registered User
Join Date: Sep 2009
Location: Visalia, CA
Posts: 247
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Re: Exhaust Cross Pipe with O2 Sensor
Thanks 406. My O2 sensor is downstream a little from the manifolds, so it may not be getting hot enough. What year truck has a heated sensor that would work on a 90 TBI? And could I splice off of the starter for a hot ignition lead?
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#11 |
Registered User
Join Date: Oct 2010
Location: Largo Florida
Posts: 632
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Re: Exhaust Cross Pipe with O2 Sensor
In the TBI trucks from 1987 to 1995, the O2 was on either the left manifold, left pipe, right manifold, or the right pipe in one of those locations. Your mechanic does not know what he is talking about and you should consider taking it to another for diagnosis, if he don't know that simple fact how the heck is he going to figure out what is wrong with the idle. Rough idle can be anything from bad plugs, dirty injectors, vacuum leak (more likily to cause a high idle), bad cap and or plug wires.
__________________
Lifes journey is not to arrive at the gate well preserved, it is to slide in sideways all used up and wore out yelling.....God what'a ride! Where patience fails, force prevails Stapp's Ironical Paradox "The universal aptitude for ineptitude makes any human accomplishment an incredible miracle." |
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