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Old 10-26-2009, 10:53 PM   #1
Psustu
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Default Car is stalling when I come to as stop, after boost.

THe Iac is only 1 year old. When I get on it, and come to a sudden stop, Idle jumps a bit, and car shuts off. Starts right back up, but this is dangerous. I was going to make a turn onto the highway, and car shut down, could barely turn in time.... Is it the BOV or the tune? Thanks
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Old 10-27-2009, 01:13 PM   #2
EODMustang
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I've been having the same problem for awhile now. I'm running a Hellion single turbo setup and it seems like every time I get on it hard then let off all the way or brake immediately, the car dies. I've been trying to figure it out for awhile now. I have a couple ideas of what it could be. I thought it might be because the IAC, even if it's working properly, can't compensate for such a larger volume of air moving through the intake piping and then it dropping off quickly when you let off the gas pedal. To fix it I thought about making the setscrew on the throttle body stick out a little farther to keep the butterfly open a little bit more at idle, then disconnecting the battery to reset the idling parameters in the ECU, then letting the car sit and run for about 15 minutes to re-learn the idle. I figure that this might take some of the burden off of the IAC to properly idle the car by letting a little more air than normal flow through the throttle body itself. Maybe somebody on here can give us a little bit more of a concrete answer than just my speculation
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Old 10-27-2009, 03:18 PM   #3
silverscmustang
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that happened once on my old V6, good thing I got rid of it lol
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Old 10-27-2009, 04:36 PM   #4
Frostbitten
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that is common with a draw thru setup on these cars. happened to me with a vortech kit and the hellion kit. both setups were done by different tuners. Finally I found a tuner that knows what hes doing at Speedy Dyno. He tuned my hellion kit and I have not once died. I told him about it before he started tuning and he knew exactly what i was talking about. The only thing he told me that he did different was raise the idle rpm a little bit. I think he increased it 50rpm
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Old 10-28-2009, 11:31 AM   #5
rthouck
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Sounds like you're just getting blower surge to me. Are your by-pass valves the correct size and properly installed. If they're adjustable are they adjusted correctly?

If the problem is when you're getting off the gas - (and it runs fine any other time) sounds like blower surge.
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