Resetting the ECU

Jeff Chambers · 10-24-2005, 06:55 AM

Back the idle set screw off until you can fit a .010" feeler gauge between the screw and the blade; now turn the screw in 1 full turn. This sets the proper air flow past the throttle blade in the closed position. Check your TPS at this point. It should be between .93 and .99 volts, no greater than 1.0 volt. With the IAC plugged in, start the car and let the idle stabilize. This is the proper idle setting for the car.

82 GT · 10-25-2005, 06:10 PM

BTW, that'a NOT the correct way to re-learn the ECU.
It's done this way:

After resetting the ECM,

1) Start the engine, and allow it to idle for 1 minute.
2) Shut it off, and wait 10 seconds.
3) Start the engine, and turn on the headlights on high, and your a/c, with the fan on high, and let it idle for 1 minute.
4) Turn all the accessories off, and turn the engine off, and wait 10 seconds.
5) Start the engine, and make it idle @ 2000 rpm for 1 minute.
6) Shut it off, and wait 10 seconds.
7) Start the engine, and turn on the headlights on high, and your a/c, with the fan on high, and make it idle @ 2000 rpm for 1 minute.
8) Turn all the accessories off, and turn the engine off, and wait 10 seconds.

This is the best way to relearn the ECM, but you should take a 10 minute test drive afterwards to make sure all is well.

10-24-2005, 06:55 AM	#1
Jeff Chambers Moderator Join Date: Aug 2000 Location: Milan, OH Posts: 2,699	Re: Resetting the ECU Back the idle set screw off until you can fit a .010" feeler gauge between the screw and the blade; now turn the screw in 1 full turn. This sets the proper air flow past the throttle blade in the closed position. Check your TPS at this point. It should be between .93 and .99 volts, no greater than 1.0 volt. With the IAC plugged in, start the car and let the idle stabilize. This is the proper idle setting for the car. __________________ Jeff Chambers 1990 Mustang GT 10.032 Seconds / 137.5 MPH 14-time Street Warrior World Record Setter CRT Performance 2001 Tropic Green Mustang GT - 12.181 / 113.2 MPH 2002 Ford F-250 Crew Cab 7.3l Power Stroke - 17.41@77.2 "There's nothing boring about a small block automatic shifting gears at 9400 rpm!"

10-25-2005, 06:10 PM	#2
82 GT Import Slayer Join Date: May 1999 Posts: 2,241	Re: Resetting the ECU BTW, that'a NOT the correct way to re-learn the ECU. It's done this way: After resetting the ECM, 1) Start the engine, and allow it to idle for 1 minute. 2) Shut it off, and wait 10 seconds. 3) Start the engine, and turn on the headlights on high, and your a/c, with the fan on high, and let it idle for 1 minute. 4) Turn all the accessories off, and turn the engine off, and wait 10 seconds. 5) Start the engine, and make it idle @ 2000 rpm for 1 minute. 6) Shut it off, and wait 10 seconds. 7) Start the engine, and turn on the headlights on high, and your a/c, with the fan on high, and make it idle @ 2000 rpm for 1 minute. 8) Turn all the accessories off, and turn the engine off, and wait 10 seconds. This is the best way to relearn the ECM, but you should take a 10 minute test drive afterwards to make sure all is well. __________________ '82 GT 351W (.060)Comp Cams 274* Extreme Energy cam, ported & polished heads w/ 1.94/1.60 valves 10.3:1 flat top pistons,stealth intake, Mallory dizzy,Holley 750dp carb, BBK shorties,Flowmaster exhaust,C-4 with 3700 stall converter, B&M pro shifter,8.8 rear, 4:10's, subframes, electric fan, powermaster alternator, 4 core radiator.

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