Sooo my 89 GGSX has been sitting for awhile. T-belt snapped shortly after I bought it, sat for about 6 months. Got around to doing the head and belts. It ran great but had a no-start when hot at that point, and tags were expired, so I parked it for about another 8 months (I have a few cars). I went to move it/wash it a couple weeks ago and it just did a no-start. I noticed the CEL wasn't coming on, I had no spark, and no fuel pressure. So I checked the main relay (aka MPFI relay), and found I had power into it on pin 10, but no ground on pin 8(from ECU). Pulled the relay and bench tested, works good. Checked ECU ground on ECU pin 104 and IGN pwr on ECU pin 110, good ground on 104, 12v on 110. Then I checked continuity between main relay pin 8 and ECU pins 63 and 66. Perfect continuity (.03 ohms). I pulled out my ecu which had been replaced by the previous owner, caps look new, board looks clean, it has a sticker from the company that rebuilt it. Hell it even smells good. However it obviously isnt grounding pin 63 to close the main relay. I pulled the cover off the main relay, and closed the contacts by hand and the CEL comes on. when I attempt to start it the second set of contacts in the relay close, and I observe spark on my tester, however it still just cranks. It HAS been sitting for awhile though, but I put fresh non-ethenol(no e-10) gas in it a couple weeks ago when I tried to start it, and it was stored nearly on empty. I'm not sure where to go from here really. /ubbthreads/images/graemlins/banghead.gif It seems like there is a fault in the ECU, but maybe I'm overlooking something. I'm going to continue poking at ecu pins to see if I can't find another fault. All testing is being done with a Fluke 88v. Any DSM gurus have any help? I'd appreciate it.
Last edited by a moderator: