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Unread 03-03-2009   #1 (permalink)
eshep007 is offline Rookie


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Angry Surging idle Mustang GT 4.6

Guys, I have a 2000 GT with the 4.6. I recently had a new engine dropped in it but ever since the dang thing won't run idle. It surges up and down, even if I let warm up. I was told that I had to drive it for about 100 miles before the computer would reset and everything would sync up. So far I've driven it for over 300 miles and it still surges. Anyone else run into this problem?
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Unread 03-03-2009   #2 (permalink)
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Try taking the Neg. Battery cable off for about 30 minutes and then reconnect it. start the car but make sure all power accessories are off (radio, air conditioning, lights, radar detector, ect, ect) and let it idle for about 5 minutes. turn the car off and let it sit for 5 or so minutes again. Then turn it back on and run your radio, ac, and lights for about 5 minutes.
chances are, whoever installed the new engine cranked the car and broke the new cam in at 2000 rpms as mandated, but failed to follow this procedure after he was done.
Your computer needs to "relearn" how to breathe or recalibrate itself after the power source has been disconnected for a while. hard for any computer to do at 2 grand for 20 minutes. try that and see how it works out...
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Unread 03-03-2009   #3 (permalink)
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Try taking the Neg. Battery cable off for about 30 minutes and then reconnect it. start the car but make sure all power accessories are off (radio, air conditioning, lights, radar detector, ect, ect) and let it idle for about 5 minutes. turn the car off and let it sit for 5 or so minutes again. Then turn it back on and run your radio, ac, and lights for about 5 minutes.
chances are, whoever installed the new engine cranked the car and broke the new cam in at 2000 rpms as mandated, but failed to follow this procedure after he was done.
Your computer needs to "relearn" how to breathe or recalibrate itself after the power source has been disconnected for a while. hard for any computer to do at 2 grand for 20 minutes. try that and see how it works out...
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Unread 03-03-2009   #4 (permalink)
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Do you happen to have your A/C or defrost on because if it is low on refriderant then it can keep cycling your compressor and whenever the compressor kicks in it bumps up your idle.
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