resetting the ECU
 

ok so i have a 1989 GT 5.0 of course. and theres plenty of mods on it.
but when i put the throttle body on i forgot to undo the negative battery cable...so is it true that i can undo the negative battery cable pump the brakes 10 times to reset the ECU or brain? cuz im having some problems with my GT at idle....in park and neutral it sits still. but at a light in drive it surges alot. sometimes once in awhile it way steady like on a cold night. or so.

help needed

Sounds like you need to adjust your TPS. Get a voltmeter and check the voltage from the TPS. You should have between .98 and 1.0 volts.
Gray and white wire, gray and red wire should be the ones.
Rotating the TPS clockwise will increase the voltage vise-versa.
This should do it.

As far as resetting the ECU, I would leave that battery unhooked for a few hours, this should clear the memory. But I don't think it is necessary at this point.

we already did the tps. its set at .94

which is better then it used to be which was .48

Maybe try cleaning your MAF sensor.

ive also already cleaned the MAF sensor. by the way the car runs fine thanks once again. this is a great site. unhooked the battery for a few hours. and then hooked it back up and the car runs fine now.


thanks alot.

I glad its working now. Usually if you unplug the neg of the battery the computer will reset within 10 or 12 mins, can't remember exactly and then your good to go. Also on the 5.0, you want your TPS voltage to be as close to 1 volt as possible with out it being 1v or past it. like a .98 or .99

yea i thought about that......i think im going to go check to see what the voltage is at.