Computer Diagnostics and Tuning Technical discussion on diagnostics and programming of the F-body computers

look at this uni file?

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Old Sep 28, 2010 | 08:49 AM
  #16  
Chaos1187's Avatar
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Oh also I cleared them after I safely parked the car It was only me in the car on this run.
Old Sep 28, 2010 | 09:09 AM
  #17  
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I also notice that the BLMs indicate lean and the IAC position is zero... this could indicate a vacuum leak which might be why the car is in cell 5 and not 16. The timing is also not advanced as much... usually the value is around 20* advance. On yours it is around 15* The PCM may be retarding the timing to try to keep the idle from being too high since the IAC is all the way closed.
Old Sep 28, 2010 | 09:30 AM
  #18  
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I looked at that, and I noticed that during the first part of an idle the IAC still reads 0 but also stays a lot closer to 20* then after the car was brought back and parked. which it sits at closer to 16* I would say.

So the IAC sitting at 0 at a stand still is wrong then?
Old Sep 28, 2010 | 09:38 AM
  #19  
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Originally Posted by Chaos1187
I looked at that, and I noticed that during the first part of an idle the IAC still reads 0 but also stays a lot closer to 20* then after the car was brought back and parked. which it sits at closer to 16* I would say.

So the IAC sitting at 0 at a stand still is wrong then?
the counts should be more then zero maybe 10 to 20 counts... basically the PCM is trying to flow less air into the intake... it can't so it might pull timing to try to slow the motor. The timing thing is just a theory though. The lean BLM + 0 IAC counts seem to indicate a vacuum leak.
Old Sep 28, 2010 | 09:47 AM
  #20  
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Okay most def. well I will def check into it, as I have few hoses that are not factory fit. They r just hoses with fastners on the ends. As well I know my intake elbow has some issues right underneath the throttle body I do not SEE anything but Ill see what it does with a cigarette by it.

Thanks again man
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