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So that leaves "AIR" as the culprit, I pulled the ISC motor out and it needed a good cleaning (the TB stayed attached to the upper intake when I did the rebuild). I cleaned it up, and with someone at the key I was playing with throttle position and, surprise, it started...

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Sorry, I missed this the first time 'round. Check the TPS values:

1) Remove the TPS electrical connector
2) 4 pins on the TPS are 1,2,3,4 (L-R)
3) Resistance between 1&4 should be 3.5-6.5K ohms
4) Resistance between 1&3 should change smoothly and proportionately as the throttle valve is opened from closed to WOT
5) Resistance between 1&2 should be 0 ohms (conductive) with accelerator pedal released, infinite ohms (non-conductive) with accelerator pedal depressed. If you flunk this test, you'll have to adjust the TPS clocked position.

There's also a test for the fixed SAS, but let's leave that for later.

If you still haven't found a suspect, test for the ECU TPS voltage:

1) ECU terminals are 1-12 (L-R, top row) and 13-24 (L-R, bottom row).
2) Ignition switch "ON", but don't start the engine
3) probe wires to terminal 19 & 24 - voltage should be between 0.4-1.0v. If it's out of range, check the TPS harness (wiggle it to see if the voltage signal changes).

That'll keep you busy for a bit....

Frank

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'89 G-Raider Supercharged 3.0L, MegaSquirt 2, lockup A/T, 2.5" exhaust, 155k, Cibie H4s/Oscar SCs, Hella Micro DE fogs, Cobra CB, Superwinch hubs, LSD rear/Aussie Locker front, Bilsteins, 165A alt., Lifeline AGM, Rust-Oleum

Edited by FrankR (10/18/05 10:35 AM)

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