When I have a steady foot on the throttle pedal the engine runs smooth at speed. when I feather the throttle or back off it completely as to go down a grade the engine bucks slightly, and causes the stick to dance back and forth (fore and aft acctually). At first I thought somehow this was related to th Idle Stabilizer Valve, but with the engine warm, the ECU should have it cut from the circuit. Today, I disconnected the O2 sensor and drove it a bit. Same problem, let off or throttle lightly, and it does this little buck dance. "It's slight, but it ain't right", as the Li'l Boy Sez!!! So I don't thinks its the O2 sensor. I tightened the big crooked hose connected to the ECU in the event there was a vacuum leak there. Should be no leaks there. So, do I have a throttle switch problem of some sort. I thought the switch shut off the fuel basically, when the foot was taken off the gas pedal. Is something happening that the injectors are getting intermittent fuel? Anyhow, any suggestions as to how to identify this little problem and correct it. All comments appreciated. Thanks, John Rodgers 88 GL Driver |
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