I am struggling to figure out what is causing this temporary stick. I am lucky to have a breakout box, so I was checking various sensors while reproducing this behavior, and I only found that the Spark output (timing?) Was changing during this behavior.
TPS voltage range is within spec. EGR holds vaccuum. Throttle body is clean.
Overall idle vacuum is low though - 12in mercury.
I am wondering if the throttle plate screw is open too much, letting too much air in which in turn is decreasing my vaccuum, yet the idle is still OK because the computer is compensating correctly (perhaps by decreasing the IAC duty cycle?). The timing change delay is confusing to me though, it's almost like the computer's got a delayed reaction when switching from Part-throttle strategy, and warm idle strategy. (Assuming that me tapping the gas is what EEC-IV would cosider part-throttle strategy, and me off the gas (throttle plate closed) is warm idle strategy.
have the same problem?
Saturday, October 16th, 2010 AT 6:04 PM