I checked the Control Relay. Opened it up and its pristine inside. Looks brand new. I manually operated the relay contacts and confirmed good continuity. I think its fine.
So now I think its the ECU. I rechecked it and its giving a replace code now. I've replaced all the e'lytic caps already and I don't see anything else on it that looks suspicious. If I get a chance today (have to work) I'll check for spark at the plugs again. Should be no spark now I suppose...
Anyone local (or not) have a spare '91 ECU that I could buy or rent? Once I know that's the real problem I'll spring for an AV-Pro rebuild.
This would potentially be the 2nd ECU failure for this truck. Should I be looking at the ISC as well? I think I read soomewhere a bad ISC can kill an ECU.
Ok, so I caved and sent the ECU to AV-Pro to be refurbished. Finally got it back today, installed it, and...KAPOWWWW!!!
No change <img src="/forums/images/graemlins/barf.gif" alt="" />
Still turns and turns. No fire. So f-ing frustrated. I was just sure she'd fire right up. I was holding back a grin as I turned the key...
So where am I??? What am I missing?
If:
-ECU is known good (based on AV-Pro's great rep at least)
-Control Relay looks good (I hear it clicking when I turn ignition, insides look pristine, continuity checks good)
-Fuel Pump comes on when fed through test jumper, and sounds strong and continuous with no sputters, etc
-FUEL SMELL OBSERVED AT TAILPIPE (***this contradicts what I thought I observed early in the process)
-Recent new distributor cap and rotor (installed last year, and ran with no problems)
-Fresh charge on battery
-Spark observed white-blue at plug (I have to admit, I have not RECHECKED this since I did it early on, and I only checked one at the time)
What would be your next move? Craigslist? <img src="/forums/images/graemlins/rolleyes.gif" alt="" />
Some things I have not checked (mostly bc I didn't know how):
-ISC
-Distributor Function
-Ignition Coil Function
-Test for vacuum leak (beyond mere visual)
-Anything Else?
IDIOT CHECK: My passenger floorboard components have been disassembled for so long I worry I'm missing something simple in reconnecting the ECU. I d/c'd neg battery terminal, plugged the 3 big connectors into the back of the ECU, connected alligator clip from the ground wire coming from one of the ecu connector to chassis, reconnected neg battery connection, cranked, hurled expletives...slammed hood...Drank Beer. Correct?
I'm sorry. I know you guys are probably tired of seeing this thread keep popping back up.
