Question about 1991 Isuzu Trooper

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Cant find o2 sensors

Where are the o2 sensors located on a 1991 isuzu trooper, 2.6 liter

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If you follow your exhaust system you will find the o2 sensors they could have one right off the exhaust manifold and your second o2 is going to be behind the catalytic converter. so you will have a o2sensor before and after the catalytic converter on the exhaust hope this helps you out.
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Aaron

Posted on May 22, 2009

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Hi there,

An O2 sensor (also known a HEGO or HO2s) is an electrical 'probe' which is screwed into your exhaust pipe/s (you will see an electrical wire connecting into your exhaust pipe).

Each exhaust pipe will have an O2 sensors (sometines 2 per side - one mounted in front of the catalytic converter and one after the converter).

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4 Answers

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Hello! I have the wiring to your engine and perhaps a solution...The wire color from the ECM on Connector D pin #7 is White/Green and goes to the O2 sensor...The color at the O2 sensor is Black...White/Blue is connector D pin #1...wire colors that have aged are easily mistaken White looks Yellow with age...connect the O2 sensor to D-7...The O2 sensor is White/Green NOT White/Blue (which looks like Yellow/Blue) this wire is the Check Engine Connector...Tell me how many wires are either cut or misplaced? If we eliminate wiring we can concentrate on why your getting 6 miles /Gal...

If the vehicle backfires or runs poorly My next suggestions are to check the plug wires to be sure they are in the correct place...and #2 to check the timing...the left bank=1, 3, 5 and the right bank=2, 4, 6...Firing order is1, 2, 3, 4, 5, 6...CCW on the distributor...Stick with me and we'll have it purring. see timing below...
saailer




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