Question about 2002 Ford Explorer

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Car is idling rough sometimes, had it on a machine that said it was the egr valve we put one on and it is still idling rough at times said either egr valve faulty , blocked egr passage egr boost sensor malfunction or egr solenoid malfunction. My husband put the new one one could there be something that he did not do that he should have when he put the new one on

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Make sure you check the whole egr system,including,egr solenoid,egr feedback sensor,evp,all of them have to be allowing sufficient flow,just replacing the egr might not correct.also check and clean the isc sensor could be faulty or dirty,that controls your stable idle.









TIM.......

Posted on Oct 23, 2010

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My Buick has a problem idleing.Sometimes it's high sometimes it's rough.Also when I have it in park and I push down the throttle it acts as if it will die. Someone said its my egr but I need more help


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Rough idle 95 astro van, I did a full tune up , plugs,wires,cap, rotor,air filter,and fuel filter and cleaned egr vavle.


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1 Answer

The car dies sometimes when idle and sometimes when traviling at


he EGR valve, or Exhaust Gas Recirculation valve, is a vacuum controlled valve which allows a specific amount of your exhaust back into the intake manifold. This exhaust mixes with the intake air and actually cools the combustion process. Cooler is always better inside your engine. The exhaust your EGR valve recirculates also prevents the formation of Nitrogen related gases. These are referred to as NOX emissions, and are a common cause for failing emissions testing. Unfortunately, your EGR valve can get stuck, causing NOX gases to build up. You'll know if your EGR valve is stuck or malfunctioning because your car will experience symptoms like rough idle and bucking on accelertaion.

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Engine light says egr problems


i would still try to change your egr!!! sometimes egr test good but still they can stick open and that can cause idle problems so if you want to get your prob fix change egr valve
take that egr off and put in a new one !!!!

Have a great day

Denis

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This make/model has a chronic problem with EGR clogging. If you have a dashboard indicator showing "check engine" most likely it is a trouble code indicating and EGR (exhaust gas recirculator) valve problem. Symptoms are rough idle, and surging and stalls.

What happens is sediments from the exaust manifold get sucked up into the valve when it opens, then stick in the valve and keep it from closing. When the valve is open when it should be closed, the engine runs very rough.

I removed my egr and then dislodged the sediment (pea-sized debris) and then re-installed the valve. Three days later, the same "check engine" and same rough idle. I must have did this at least three or four more times.

What I found that gave me a permanent solution was an aftermarket filter gasket that keeps debris from clogging. I don't remember the name of the product, but a search for "EGR filter gasket" may lead you to the product.

Install the gasket between the EGR and the exhaust manifold and you should be good to go. Note: on 1995 and newer models, disconnecting the EGR from the wiring harness (common on R&R) may require the computer to be reprogramed.

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