Oxygen Sensors
Chevy Silverado
Lexus LS

What could cause a 1991 Lexus LS400 to shake at high speeds rough idle but then go away after 20 minutes and could it be an oxygen sensor bad exhaust lines or bad fuel injectors?

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2011-09-13 22:57:05
2011-09-13 22:57:05
Lexus Running RoughYour question is not clear. High speed shake rough idle? Does it do both? If an O2 sensor or any other sensor for that matter was bad, you CEL (Check Engine Light) would be illuminated. If you suspect it is due to an engine malfunction and not a suspension issue I would go to Auto Zone and ask them to attach the computer scanner (free) and see if you have any codes. For detailed information go to lexusownersclub.com and post the question. I have been a member there for a long time and that is the Lexus expert website. Tell them vbdenny sent you and I get a gold star.

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My same problem:

I have exactly the same problems with my Lexus but this is a early 97 one. the bad idling is not noticed by the EQ I think as there is no engine light burning. I have read on a forum that someone changed the engine mounts and drive shaft trannys to get rid of the vibrations at higher speeds. Is your one vibrating when pulling or braking on the engine at high speeds? In my case it is only vibrating when I am cruising at a constant speed. I checked mine but could nog see anything particularry there. Still I ll try to change them as they cost only $24 on eBay. Try the O2 sensor tutorial on www.lexls.com . And please let me know when you solved the problem as I have the same problems.

Good luck searching!

Milko

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The sensor in the exhaust manifold is the oxygen sensor. It measures the amount of oxygen left in the exhaust after combustion. The computer then takes that information and "decides" if the car is running rich or lean. It then adjusts the fuel injectors to keep the emissions at a minimal level.

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Measures the amount of oxygen in the exhaust

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The upstream oxygen sensor is mounted in the exhaust manifold The downstream oxygen sensor is mountedin the exhaust pipe after catalytic converter

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The upstream oxygen sensor is mounted in the exhaust manifold The downstream oxygen sensor is mounted in the exhaust pipe after the catalytic converter

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The oxygen sensor is located on the exhaust manifold and is the only item on the exhaust with wires going to it.

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Could be a diesel? If not then replace your oxygen sensor on your exhaust. A bad oxygen sensor causes the exhaust smoke to be dark in color.

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heated exhaust gas oxygen sensor

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In the exhaust manifolds & in the exhaust itself

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The oxygen sensor is screwed into the exhaust, behind the engine.

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The oxygen sensor is screwed into the exhaust before the catalytic converter.

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On the Minivan it is the sensor in the exhaust on the back of the engine in the exhaust manifold.On an Intrepid/LHS/Concorde it is the pass side above cat oxygen sensor.On the Minivan it is the sensor in the exhaust on the back of the engine in the exhaust manifold.On an Intrepid/LHS/Concorde it is the pass side above cat oxygen sensor.

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The oxygen sensor is located in the exhaust manifold before the catalytic convertor. If you look down between the radiator and the exhaust manifold a few inches before the exhaust pipe connects to the exhaust manifold you will see the Oxygen sensor. The sensor will have 2 wires coming from it and it kinda looks like a sparkplug stuck into the exhaust manifold. There is 2 nuts that hold the oxygen sensor into the exhaust manifold.

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If your 1988 Chevrolet Celebrity has the V6 engine the oxygen sensor is in the middle of the exhaust manifold nearest the firewall. If you have the 4 cylinder engine the oxygen sensor is located in the exhaust manifold just above the exhaust pipe flange.

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it is in the exhaust manifold,or exhaust pipe...

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oxygen sensor is found either in exhaust manifold or in actual exhaust pipe between manifold and muffler

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In a 1998 Jeep Wrangler, the oxygen sensor is located in the exhaust pipe. It can be found just below the junction of the exhaust manifold and the exhaust pipe.

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Usually its caused by your oxygen sensor also known as O/2 sensor. Or a missfire caused by water in fuel or dirty injectors. You can turn the light out by disconecting your battery for 10 minutes or longer but not less,this will reset the computer and the light will stay off unless the sensor is bad or you have another missfire.The sensor is located in the exhaust pipe.

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oxygen sensor on 2.0 is located on the exhaust pipe on v6 it is located in front and rear exhaust manifolds

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oxygen sensors are on the exhaust pipe close to the engine. Some are on the exhaust manifold. some may have an upstream and a down stream sensor.

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A/F sensor are located in each exhaust manifold, O2 sensor After catalytic converter on exhaust pipe

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All oxygen sensor are in the exhaust either before or after the catalytic convertor.

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In the exhaust pipe. the oxygen sensor is not in the exhaust pipe it is directly under the hood off of the exhaust manifold. it sets by itself and is easy to get to. you will probably have to cut the old sensor wire to get the old one out.

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Oxygen sensors are located on the exhaust pipe, generally between the exhaust manifold and the catalytic converter.

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your oxygen sensor should be located on your exhaust manifold or on the exhaust pipe near the exhaust manifold, Make sure your engine is cool before placing your hands on the exhaust manifold, It can be very hot!

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A HO2 sensor (heated oxygen sensor) moniters the level of oxygen in the exhaust and sends that information to the engine control module.


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