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1991 Chevrolet G20 Vans Base Cargo Van

1991 Chevrolet G20 Vans
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November 2, 2012, 4:59 pm

Robin L
 

Question: Have a dead spot just above idle (like for backing up or in slow traffic even @ speed j

I,ve replaced: plugs wires cap rotor coil , IAC & Removed throttle body & cleaned , new gasket , vacuum hoses , fuel filter. Fuel Pressure is 14. NOW WHAT. IDLES GOOD , starts , runs good. Chked for vac leaks multiple time. It been doing it for bout 2500 mi mostly highway. Ran LUCAS Fuel treatment thru it. ?????????? HELP


November 12, 2012, 12:44 pm

Elizabeth K
Expert Mechanic

I would look for a stuck open EGR valve, or get a scan tool with an o-scope on it to check for a flat spot on the TPS. Either would cause what you're describing.


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November 13, 2012, 8:57 am

Robin L
 

Just replaced TPS , As suggested by local mec , ran it aliitle bit still doing some, did unhook batt about 5 min to reset Left batt disconnected over nite. Going to test drive if not bettr will EGR VALVE Stuck hurt gas miligage or make it eventfully quit running. Need to drive 400mi outof $$ to buy EGR.


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