Question about 1999 GMC Jimmy

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What is the cause of High emissions of Nitrous Oxide on 99 GMC Jimmy

What is the cause of High emissions of Nitrous Oxide on 99 GMC Jimmy

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  • yadayada
    yadayada May 11, 2010

    Allot of things, defective egr valve and timing to far advanced are the most common



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New catalytic converter and oxygen sensors

Posted on Nov 05, 2008


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What is the use in AGR of ingine and what is the meaning?

Exhaust gas recirculation.
It's designed to reduce the emissions of your exhaust, in your leaded, unleaded or diesel fuel driven vehicles. Exhaust has nitrous oxide in it, and EGR is designed to reduce that nitrous oxide.

Mar 26, 2015 | Cars & Trucks

1 Answer

What's trubleP0453 on 99 gmc new Sierra 1500 4.8

P0453 - Evaporative Emission Control System Pressure Sensor High Input

Possible causes- Evaporative Emission System (EVAP) Pressure sensor harness is open or shorted
- Evaporative Emission System (EVAP) Pressure sensor circuit poor electrical connection
- Faulty Evaporative Emission System (EVAP) Pressure sensor
- Damaged fuel tank pressure sensor

Oct 11, 2012 | Cars & Trucks

1 Answer

1993 Gmc Jimmy starts and sounds ok but began to buck and jumpl Changed plougs and wires with no change. Catylitic converter is making noise at the outlet

looks that your catalytic converter is broken.Before you do anything take it to a qualified mechanic and request for emission test to see whether you do have high emission due to lambda sensor failure or cat. also you can check from your exhaust end if your emissions smell like rotten eggs.If so change cat.

Sep 10, 2012 | 1993 GMC Jimmy

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1997 gmc jimmy.headlights,high beams and fog lights dont work.daylights work.

sounds likr the daylight running light reley or day light cont module is pooped

Sep 30, 2011 | 1997 GMC Jimmy

1 Answer


The EGR valve is basically a device that routes some of the exhaust back into the engine to help control nitrous oxide emissions, The valve is turned on/off by the vehicle computer and the computer has noticed that the voltage it is seeing on that circuit is to high indicating a problem with either the switch or the wiring between the switch and computer. Typically it is not in the wiring but a visual check of the wiring condition will help verify that. I would suggest replacing the EGR Valve and then having the code cleared with a scan tool.

Feb 21, 2011 | 2005 Chrysler 300

2 Answers


The most likely cause of this is a faulty exhuast recirculation system.It is used to cool the combustion process preventing the formation of nitrous oxide emissions. The main building block of acidic rain.Use your emission diagram and locate the EGR valve.You will need specialized equipment to check it. Other than taking it off and checking for blocked passages from carbon build up there is little you can do yourself.

Dec 31, 2008 | 1995 Ford Contour

1 Answer

1986 camaro emissions problem- 6 cylinder stick

high hydrocarbons indicates head gasket(1 or both) leaking , carbon monoxide is a worn out catylitic convertor which both could lead to the oxy sensor getting a false reading

Oct 28, 2008 | 1986 Chevrolet Camaro

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