Gents;
I have a friend with a 88 accord dx??? who has asked me to diagnose his problem. This probably sounds familiar. Somebody replaced his EGR valve and that didnt fix it. The guy then plugged the EGR valve. No fix. The car revs high between shifts but other than that I think he has no problems. Any help? He is in Michigan and I am in Kansas so......best I can do is relay instructions .
Thanks in advance.
Wimpy
The EGR valve is the main emissions control component in the exhaust gas recirculation system. The valve is located on the intake manifold, and opens a small passageway between the exhaust and intake manifold to allow a metered amount of exhaust to flow back into the engine. This reduces combustion temperatures and helps control the formation of oxides of nitrogen. The EGR valve is opened by the application of vacuum to its control diaphragm. Some also require a certain amount of exhaust back pressure before they'll open. On newer vehicles, the valve is electronic and uses one or more solenoids or a small stepper motor. The valve should remain closed while the engine is cold and at idle. It should only open once the engine has warmed up and is running at part-throttle. If the valve sticks shut (or is disconnected), NOX emissions will soar and detonation will often result. If it sticks in the open position or fails to close all the way, it acts like a vacuum leak resulting in a rough idle, hesitation and possible stalling.
doesnt sound like its the EGR valve, especially if its blocked off. possibly the carb throat is getting stuck open when the engine warms up, the throttle may need adjustment, or he needs to take his foot off the gas while shifting!
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