Question about 1993 GMC Sierra C3500

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Where is the egr valve on a 1993 6.5 diesel engine . i need location on the engine . could this be a the problem for idling rough vaive rattle rough starting

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Hi, the EGR valve is sitting on the intake manifold as shown below. Yes, this valve can be the cause of had start/rough idle if it is stuck open. Remove the valve to see if you can blow thru it. If it's stuck open, you may be able to repair it by cleaning with carb cleaner. If you cannot get it to close properly, replace it. If the valve is closing properly, pull off the vacuum hose, start the engine, and make sure there is no vacuum on the hose at idle. If there is, the vacuum solenoid may have failed open. The solenoid is shown in the second picture below. You should not be able to blow thru this one either, except when it is turned on by the PCM. Please let me know if you have more questions, and thanks for using FixYa.

where is the egr valve on a 1993 6.5 diesel engine - jturcotte_1457.gif

jturcotte_1458.gif

Posted on Apr 07, 2011

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2 Answers

Where is the egr valve on a 99 Ford expedition


The EGR valve is in a very difficult spot to work on. If the EGR is bad it will set off the check engine light and make the vehicle run rough or stall at idle. It really doesn't make it run rough while driving or accelerating. What are the conditions when the car runs rough?

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when you remove the valve start the engine it will rev high but thats okay, with engine running you will see two ports, one should have vacuum and the other exhaust, make sure they are not plugged, if so unplug them. start with this.

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Sounds like the Torque Converter Lock-up Solenoid is failing. It will cause the car to run rough at slow speeds, and sometimes stall while idling in gear (at a stop sign for example)
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Sounds like a possible Idle Air Control valve, or more likely there is carbon stuck in the EGR valve. If the EGR valve is stuck open because of carbon chunks, the engine will run very rough, barely idle, and surge. Remove the EGR valve, clean the inside of it with carb cleaner, and replace the gasket with a screened gasket. This doesnt allow carbon the reach the valve and clog it again. Valve is located on front of the intake manifold. . .under the rubber intake boot going into the throttle body

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1 Answer

2006 Kia Sorento 4X4, Diesel. Starts right up but runs "rough" (more vibration than normal and valves rattle at low revs) and produces great deal of white smoke until engine heats up (after about 2-3...


i would check all the basics like spark plugs and check for vacuum leaks around the intake manifold.With a can of 2+2 carb cleaner while engine is running --if idle goes up or down that is were your leak is--
check egr too, Lee

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1 Answer

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You can remove the egr and see if it has been sealing,and if it still moves.

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check to see if the vehicle has EGR valve most of them are either elecrtronic or vacum controlled disconnect it and start it check and see if this smoothes out cause it sounds like the valve is staying open while the engine is cold if thsi solves the problem replace the valve.

secondly take a small screw driver aor a tiny hammer and tap the valve while the engine is running if it smoothes out replace the valve the valve is carbon filled and needs to be changed .

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