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Re: 1989 900S 5 speed ECU; need advice Posted by RS [Email] ![]() ![]() ![]() In Reply to: 1989 900S 5 speed ECU; need advice, Greg, Sat, 18 Oct 2003 14:49:34 Members do not see ads below this line. - Help Keep This Site Online - Signup |
Starting when the fuel pump relay is jumpered sure sounds like the ECU has bagged it. Something similar happened to my '89 SPG.
The good news is that ECUs from '88 900S through '90 900S, '88 through '89.5 9000S, '89 through '89.5 9000T, and '89 through '93 900T will work. If you get an ECU from a Turbo, you may want to consider swapping the EPROM from yours into the turbo ECU to keep the fuel mapping the same.
I've been lucky getting used ECUs from junkyards.
You will definitely want to replace the system relay and fuel pump relay. These relays have a device that bleeds off the electrical pulse that occurs when the relay is switched off. This pulse eventually damages the solid state relays (transistor) in the ECU. The system and fuel pump relays are availiable from several of the site sponsors for $12 to $13 each.
posted by 68.166.19...
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