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Re: egr valve is bad on my 1989 chevy with 305
Although bypassing is not a good idea,If you are doing this,You just cap the vacuum line with a small bolt,Cap the exhaust tube with a threaded cap.then you will need to reset or remap the ecm and ****** the timing about 2 degrees.
The ecm will need to re learn to adjust the proper fuel/air mixture
and you may never get the check engine light to go off.
Also you will notice a decrease in MPG
If I were you,I would just put a new egr in.(They are cheap)
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What has happened more than likely, unfortunately, the internal piston seals on the servo controls have gotten hard and not usable after this period of time sitting still. The answer is to remove and replace all the seals inside the transmission. Sorry this is the answer, but that is from my 35+ years experience in trans. overhauls. You should not have to replace clutches and plates, also make sure there is no rust on the internal drums from sitting still.
All that Failed EGR valve, EGR solenoid faulty, Failed EGR pressure sensor and failed EGR vposition sensor may be telling you that is the EGR valve is faulty and not that it is loaded up with carbon. But I know you don't want to hear that as that EGR cost more than a can of carb clean and I don't blame ya!
If yoy have a multi meter, check out easyautodiagnostics.com, go to the GM section for your motor, chose test EGR and there should be an explanation on how to run some test on your EGR before you buy a new one.
Symptoms of a bad EGR valve are usually stumbling idle or the engine stalling when the car is warm (normal operating temperature). Find the EGR valve and locate the vacuum line attached to it. Start the engine cold and wait for it to warm up. When the engine starts to stumble, pull off the vacuum line. If the EGR is bad, the engine idle will stabilize and no longer stumble.
IF YOU GOT GAS ENGINE.PROBLEM COULD BE STOPPED UP FUEL FILTER OR WEAK FUEL PUMP.LOW ENGINE COMPRESSION.BAD SPARK PLUG + WIRES + ROTOR AND CAP ALSO BAD COIL CAUSING WEAK SPARK.IF YOU HAVE DIESEL ENGINE SLUGGISH.PROBLEM COULD BE RESTRICTED AIR FILTER DIESEL.INJECTION PUMP TIMING OUT OF ADJUSTMENT.FAULTY EGR AND EPR VALVES.RESTRICTED EXHAUST SYSTEM STOPPED UP MUFFLER PLUGGED FUEL FILTER.PLUGGED FUEL TANK DUE TO FAULTY FUEL CAP.MISSING PROBLEM COULD BE CAUSED BY DIRTY OR FAULTY INJECTORS. THE INJECTION PUMP TIMING OFF. AIR IN FUEL.OR FUEL RETURN SYSTEM RESTRICTED.STOPPED UP FUEL FILTER.OR USING INCORRECT FUEL OR ITS CONTAMINATED.