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

Having Idle problems

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Old Jun 19, 2006 | 01:31 AM
  #1  
plan Z's Avatar
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From: Clearwater, FL
Having Idle problems

Well my idle is a little low and i have problems when i let off the throttle and slow down/come to a stop, my rpm's drop very low and the car almost dies. need to adjust the idle up a little and not sure what else i need to adjust. i've already set the IAC Target RPM Vs. Coolant Temp tables. Wondering what other tables would be good to adjust?

other tables include:

Idle Underspeed Spark Advance Vs. RPM Error
Idle Overspeed Spark Retard Vs. RPM Error
Throttle Follower IAC Offset Vs. MPH


or would the car almost dying when i let off the throttle be spark or MAF table related?
Old Jun 20, 2006 | 07:39 AM
  #2  
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Re: Having Idle problems

What are your IAC counts? The IAC should keep it from doing that when you let off the throttle. It doesn't seem like it is letting enough air pass by the tb. The counts should be anywhere from 20-40 at idle.
Old Jun 20, 2006 | 08:55 AM
  #3  
plan Z's Avatar
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Re: Having Idle problems

i'll have to check again. i think they are a lot higher than 20-40 though. if thats the case, which table(s) should i adjust?
Old Jun 20, 2006 | 10:01 AM
  #4  
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Re: Having Idle problems

Just adjust the throttle stop screw until you get the counts in the right visinity. Use Freescan or something to monitor the counts. Low counts = tb blades open too far (high idles) and high counts = tb blades not open far enough (low idle). That would explain your problem. Your IAC could be bad/dirty also. If you can't adjust it back where it should be, I'd blame the problem on a faulty IAC.
Old Jun 20, 2006 | 07:20 PM
  #5  
plan Z's Avatar
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Re: Having Idle problems

alright, thanx alot. i'll try that
Old Jun 23, 2006 | 11:19 AM
  #6  
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Re: Having Idle problems

Did that fix it?
Old Jun 24, 2006 | 08:25 AM
  #7  
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Re: Having Idle problems

i havent had time to work on it yet (working quite a few hours right now). i'll post back up and let ya know
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