I thought the probelm was the EGR valve. Replaced it ( looked horrible all pluged up) This f ixed Idel probelm temporarily. Now when it is worse then ever. Low RPM's it dose not do bad but anything over 1500 it will Sputter and allmost stall out wile driving until you reach over 3800 RPMs. When engine is warmed up it seems to help a bit. Looking for help please? Mass Airflow sensor? or maybe Map sensor? let me know thanks Anthony
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REMOVE EGR VALVE CLEAN OUT THE CARBON INSIDE THE EGR VALVE PORT HOLE IN THE INTAKE MANIFOLD WHERE EGR VALVE SITS.CAREFULLY USE A PIECE OF CLOTHES RACK OR A TINY SCREW DRIVER CLEAN CARBON OUT ROUND HOLE.USE A SHOP VAC TO VACUUM UP THE DEBRIS TO KEEP FROM GETTING INSIDE INTAKE.DONT USE SHOP VAC IF YOU HAVE ANY FUEL LEAKS OR SMELL GAS FUMES UNDER THE HOOD.
Sounds like an EGR valve sticking. Start the engine cold and let it warm up. As soon as it starts to hesitate/stumble, pull the vacuum hose off the EGR and if the engine maintains a steady idle, replace the EGR valve. The EGR is sticking intermittently but it won't be long before it sticks all the time and you won't be able to keep the car running when it gets warm. This is an easy diagnosis, removal and replacement for the do it yourself car owners. Please rate me on my answer.
It could be several things but most of the time with these its a faulty EGR valve that causes the off idle sputter. You can take a piece of tin soda can and bolt it between the valve and intake. If the probelm goes away then the EGR valve is at fault.
You might have your computer checked to make sure the circuit that controls egr valve is working. On my vehicle, I had several egr valves changed and failed the emissions test until I had the computer changed and the PROMS updated with the latest PROM.
The EGR valve is easy to change because it is on top of the engine. It has electrical coils that control the valve and one of the valves may be damaged where it can not compensate at idle. If the EGR is working, when the engine first starts the engine should increase in idle speed and then switch to a lower idle speed. This is part of the EGR system check and it adjusts as the engine increases in temperature.
There are several other reasons if one of the Emission sensors is faulty that may cause the rough idle. The oxygen sensor, tempearture sensor, MAP sensor,...etc. You may have a trusted mechanic attempt to read any codes on the engine.