Re: AMM resistor mod - Saab Performance Bulletin Board - Saabnet.com
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Re: AMM resistor mod
Posted by kooch (more from kooch) on Mon, 13 Aug 2001 12:06:21
In Reply to: AMM resistor mod, Vince T, Mon, 13 Aug 2001 10:28:22
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really easy. is your amm is the non-adjustable type (i.e. adjustment screw has epoxy in it), you need to put a resistor in the circuit. get a 300 ohm resistor from radio shack. i had to get a 270 and 33 ohm since they didn't have a straight 300. but there was a 5% variance on the resistance and in series, they came out to 300.4 ohms w/ my meter. anyway, disconnect the amm connector. i found it was easier to work on it by disconnecting the throttle position switch connector and pulling that part of the harness out from under the throttle body and laying it on top. then, pull back the boot of the amm connector. there is an orange wire (i believe terminal 2 or 3?, but it is only one there). push boot up a little so you have room. then cut the wire (leaving enough room to strip the wire for splicing). i used two butt connectors and the resistors to reconnect the wires. then put everything back to normal and your set. the orange wire is supposed to control the width of the injector pulse. by adding resistance, the pulse shortens to allow less fuel. so, it gets idle back to normal. without the resistor, the 30# injectors allow too much fuel at idle, which makes the mixture too rich, and the ecu can't compensate. so, the unit goes into limp home mod and idles around 12-1300 rpm. my problem was solved with this mod. let me know if you have any more questions. good luck.
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