5.0L (1979-1995) Mustang Technical discussions on 5.0 Liter Mustangs within. This does not include the 5.0 from the 2011 Mustang GT. That information is in the 2005-1011 section.

Sct Chip install

Old 04-16-2010, 12:36 AM
  #1  
zippo2341
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Default Sct Chip install

Hey, i ordered an sct chip from american muscle, and got a 93p 91p and 87 tune. Heres my question, car runs fine and does pull harder up top. however my idle is at 1000rpms. I went home installed the chip and drove it 55miles back to school on the highway. Even after i pulled in the parking lot and the car was obviously warmed up the idle was still at 1000rpms. If i switch it to the stock tune my idle goes back to 750rpms. Does the computer have to go through a learning stage at all? Or is there a screw up somewhere? thanks, Jay.

Can you switch tunes while the engine is running? Or does the motor have to be off? I switched through all the tunes to make sure the car overturns, but only after shutting the car off.
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Old 04-16-2010, 06:56 AM
  #2  
mjr46
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lol , mail order tunes = you get what you pay for, and for your relatively stock set up, = was a total waste. proplem is is the tune, most likely, idle strategy has been modified
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Old 04-16-2010, 07:40 PM
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DO NOT SWITCH TUNES WHILE DRIVING. TURN YOUR CAR OFF AND EVEN TAKE THE KEY OUT. YOULL BURN UP YOUR CHIP AND THE COMPUTER. ----coming from experience
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Old 04-16-2010, 11:08 PM
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luckythirteen13
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take the chip out, send it back. you got ripped off. you can buy a timing light for $10 so if you paid more then $10 for the chip you paid too much seeing as all it does is advance the timing.
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