When the gas peddle is depressed to about 2500 rpm's the engine has a bad surge, it is consistant surge fron 5oo rpm to 3000 rpm , back and forth. any ideas
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1991 Honda Civic
Question: surging engine at 2500 rpm and above
Answer #1patrick mannion from Greg Solow's Engine Room, January 31, 2009, 16:55Master
There are many different engine options on the Civic that year. Oxygen Sensor that is failing can be responsible for surging problems. With the engine switched off disconnect the EGR valve and see if the surging goes away if it does the EGR Valve may be faulty or the EGR passages may be partially plugged allowing EGR into one cylinder only. Need to know what engine and how many miles do you have on your car. When were the valves last adjusted?
Visitor, August 25, 2010, 21:39
it is the air control valve or the air control sensor