Hauling Ass then Idle only

Discussion in 'Boss 302 and S197 Technical Forum' started by lakeside, Jun 2, 2018.

  1. lakeside

    lakeside TMO Intermediate

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    Just left CMP and had the strangest thing happen. First session, car is runningi fantastic then out of the blue it goes into an idle only mode. Let it cool down, starts up and runs fine. Go top up with gas and go out for second session, again car runs great and after a few laps goes into an idle only mode but this time it’s a very rough missing idle. Using the gas pedal does nothing. Loaded up and went home. Haven’t scanned for any codes yet, but wondering if anybody has ever experienced something like this?
     
  2. Drlee50

    Drlee50 TMO Race

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    sounds like random misfires and a limp mode. pull the codes to see....
     
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  3. lakeside

    lakeside TMO Intermediate

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    Yes, knew that,went to get my scanner and remembered I let someone “borrow “ it. Was just asking if someone ever experienced the same thing. I’ll buy a new scanner this morning to pull codes, I’m thinking TPS right now
     
  4. Drlee50

    Drlee50 TMO Race

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    Yes- I have experienced it and it was random misfires and it was just in limp mode. Mine was the Crank position sensor. it appears it was changed as it had a rubber oring, but i doubt it was flashed properly. I put in a new one and had ford program it, and no more misfires at all and definitely no limp mode BS. It could happen for many reasons, plugs, coils, CPS, bad gas, low octane, noise coming thru the block simulating knock etc. Hopefully codes will get you started in the right direction.
     
  5. lakeside

    lakeside TMO Intermediate

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    Well, got my scanner back and looked at the codes it threw,YIKES☠️ Gonna need some help here
    Codes P2104,P2107,P2110,P2100. Chassis,Mechanical I’m pretty strong, but as an official old fart member I get a little challenged with newer electronics. Has anyone ran across this group of codes together. My uneducated guess is leaning towards a throttle position sensor or entire throttle body.
    Certainly open to any suggestions on where to start.
     
  6. ArizonaBOSS

    ArizonaBOSS Because racecar. Moderator

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    Punch those codes into google and let us know what comes out :)

    Edit: Sounds like your throttle body is toast or your Accelerator Pedal Position Sensor is. Or you have some wiring to either of those units that has been damaged.
     
  7. lakeside

    lakeside TMO Intermediate

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    Well I actually googled it as soon as I read the codes. Got a lot of responses like yours, no clear consensus. Changed out accelerator pedal unit from one shop’s expert opinion and ran fine til the next track event. Throttle body looked fine,in fact very clean, was headed for the Throttle Position Sensor next but Summit sent the wrong one. Checked wiring and everything looks good. Guess I’ll just wait for Summit to send the correct TPS and see what happens.
     
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  8. lakeside

    lakeside TMO Intermediate

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    Well hopefully at the end the saga, took the car to Pro Dyno in Fort Mill, found the wire connector to the Throttle Body was shorting out sending spaz signals to the computer. Bad news, it cost me 2 Track days after paying a shop in Martinsville to fix the problem. Good news, got an epic Dyno tune from Dan. Now on to Watkins Glen.
     
  9. 302BOB

    302BOB TMO Addict

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    Saw the title of this thread and said to myself "this describes someone you know"..only I would amend it to "idle slowly"...:rolleyes:
     
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