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Re: [GMCnet] muffler and placement [message #159677 is a reply to message #159633]

Wed, 08 February 2012 21:57

rvanwin

Messages: 325
Registered: April 2007
Location: Battlefield, MO

Karma:

Senior Member

Keith V wrote on Wed, 08 February 2012 12:48

My O2 sensor is just after the header.
it's too hot there, keeps over heating, so I'll have to move it back a ways.

If you are talking about your narrow band O2 sensor, you do not want to move it back any further. If you have it just after the header that is about where it should be. With headers, normally you needed a heated O2 sensor in order to keep it hot enough because headers generally allows more heat to be given off. At idle, the O2 can get too cold and stop working until the engine is at higher RPMs. Also, you don't want to move the O2 too far down the stream because the delay in sensing mixture and resultant correction can cause some problems with fueling. Generally, the ECM is "timed" based on the O2 sensor being 7 - 12 inches from the exhaust ports. I believe you might have a different problem than your O2 getting too hot. Narrow Band O2 sensors do go bad so that is a possibility - sometimes getting what I call "lazy". A lazy O2 sensor does not switch between rich and lean very quickly and can cause longer periods of the mixture being either too rich or too lean. If you do not have a heated sensor then it is possible you need a heated sensor because of the headers. Grounds can be a problem with the sensor so that is also a possibility.

If you are talking about a WB O2 (not used to give feedback to the ECM) then that sensor should be placed further down the line because excessive heat can shorten the life of the sensor. The Narrow band and WB sensors work differently from each other.

Randy & Margie
'77 Eleganza II '403'
Battlefield, MO

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[Message index]

		muffler and placement By: sgltrac on Tue, 07 February 2012 19:37
		Re: muffler and placement By: Larry on Tue, 07 February 2012 20:04
		Re: muffler and placement By: Keith V on Tue, 07 February 2012 21:14
		Re: muffler and placement By: Dennis S on Tue, 07 February 2012 20:55
		Re: muffler and placement By: gbarrow2 on Tue, 07 February 2012 21:51
		Re: muffler and placement By: mike miller on Wed, 08 February 2012 05:25
		Re: [GMCnet] muffler and placement By: Mr ERFisher on Wed, 08 February 2012 05:31
		Re: muffler and placement By: Larry on Wed, 08 February 2012 07:07
		Re: [GMCnet] muffler and placement By: USAussie on Wed, 08 February 2012 08:24
		Re: muffler and placement By: GeorgeRud on Tue, 07 February 2012 21:52
		Re: muffler and placement By: Ken Burton on Wed, 08 February 2012 01:42
		Re: [GMCnet] muffler and placement By: emerystora on Wed, 08 February 2012 10:06
		Re: [GMCnet] muffler and placement By: emerystora on Wed, 08 February 2012 10:08
		Re: [GMCnet] muffler and placement By: Ken Burton on Wed, 08 February 2012 20:35
		Re: muffler and placement By: Keith V on Wed, 08 February 2012 08:08
		Re: muffler and placement By: sgltrac on Wed, 08 February 2012 12:04
		Re: [GMCnet] muffler and placement By: emerystora on Wed, 08 February 2012 12:34
		Re: [GMCnet] muffler and placement By: Keith V on Wed, 08 February 2012 12:48
		Re: [GMCnet] muffler and placement By: rvanwin on Wed, 08 February 2012 21:57
		Re: [GMCnet] muffler and placement By: sgltrac on Wed, 08 February 2012 14:32
		Re: [GMCnet] muffler and placement By: Mr ERFisher on Wed, 08 February 2012 14:44
		Re: [GMCnet] muffler and placement By: emerystora on Wed, 08 February 2012 14:44
		Re: [GMCnet] muffler and placement By: James Hupy on Wed, 08 February 2012 14:45
		Re: [GMCnet] muffler and placement By: sgltrac on Wed, 08 February 2012 17:10
		Re: muffler and placement By: PETEinLongBeach on Wed, 08 February 2012 12:47
		Re: muffler and placement By: tphipps on Wed, 08 February 2012 14:56
		Re: muffler and placement By: PETEinLongBeach on Wed, 08 February 2012 15:23
		Re: [GMCnet] muffler and placement By: USAussie on Wed, 08 February 2012 17:21
		Re: muffler and placement By: mike miller on Wed, 08 February 2012 20:32
		Re: muffler and placement By: sgltrac on Thu, 09 February 2012 23:55
		Re: muffler and placement By: WD0AFQ on Fri, 10 February 2012 00:16
		Re: [GMCnet] muffler and placement By: sgltrac on Fri, 10 February 2012 00:23
		Re: [GMCnet] muffler and placement By: MIGUEL MENDEZ on Fri, 10 February 2012 11:08
		Re: [GMCnet] muffler and placement By: Ken Burton on Sun, 12 February 2012 03:25
		Re: [GMCnet] muffler and placement By: mickeysss on Mon, 12 March 2012 10:52
		Re: [GMCnet] muffler and placement By: sgltrac on Tue, 13 March 2012 08:51
		Re: [GMCnet] muffler and placement By: Larry on Tue, 13 March 2012 10:18

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