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flatsix36

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Everything posted by flatsix36

  1. flatsix36
    the correct clutch switch to bypass is the farthest switch towards the front of the car. It has 2 single wires going to it the switch with the plastic red or brown connector is for cruise.
  2. flatsix36
    The 99 C2 TC has a cable controlled throttle and the TC does not work in the way you described. I don't see how this would effect the idle. correct it also has an iac, and in this situation the tc is holding the iac wide open because the rear wheels are showing a lower speed signal than the fronts or it is possible that it is a programming flaw in the abs/tc programming. On the 986 I was working on it had 40 series tires in the rear instead of 35 series, with a piwis tester I watched the wheel speeds up to 35kph they were 4-5 kph off from front to rear. I do find it very strange that the abs would have anything to do with changing the iac setting, but it is.
  3. flatsix36
    Well I have good news. You need the correct size matched tires. Your car has Traction control built into the abs control unit. When the abs control unit sees a difference in speeds front to rear at speeds the abs control unit sends a signal to the dme to hold the idle high incase the clutch is reengaged. The abs/tc gets confused because it is seeing a slower wheel speed in the rear than the front so it thinks the rear end ir locking up when you back off the gas. the cheap fix is to just turn the TC off. and you will be ok other wise you will need to get correct matching tires for that car. Unfortunately I have spent way to much time on this problem....I believe I have about 22 hours clocked onto tracing this stupid problem out that I will probably get paid 3 for but at least I have the glory of saying I figured it out :) please repost if this works. Thanks Tom Porsche of North Scottsdale
  4. flatsix36
    I'm having the same issue with a '99 986 which is the same basic setup(mecanical throttle body with IAC). Drive the car over 2000-3000 rpm it will intermitently hang. The client replaced the iac himself, so I took his word on it that he replaced it and went on from there. Also the DME wont fix it either I programmed a used control unit and same problem, so dont bother with that attempt. My next step with mine is I'm going to back probe pin 2 of the iac (supply voltage) and see if the supply voltage is going away when the iac hangs open. If I find anything out with that I will let you know. Tom
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