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sudden death - brain dead? Ignition control unit?[200/85] posted by Bob on
Thursday, 30 November 2000, at 1:03 a.m.
Hi guys,
Gotta love it, the blue brick died taking my wife to work. In the rain. On a curve. On a hill. Facing uphill. Dang.
Ok, enough whining. Try the key. Starter turns, 25A fuse OK, clean batt. terminals, chk cables and accessory wires, grounds all ok. inside fuses all ok. Disconnect AMM just for grins & try again - nope. Hmmmmm. No spark, nuttin from coil, no fuel pump noise. Tow it home. Jumper to fuel pump-more grins - ok. Main relay ok on both sides. Dang. Woulda been cheap. OK, pull main connector from ECU and run tests. NOW, here's the rub. I have an 84 shop manual(Volvo) & an 85 car. I don't know how closely the two systems coincide. We ran all the tests for an unstarted engine, skipping the ACV, throttle valve switch, injectors, oil & temp sensors. Minor deviation on the AMM, but diff AMM from book & doesn't figure for absence of spark anyway. To me it points to the ECU, but I have no previous experience with either ECU or Ignition CU failures. Any ideas,
or does anyone have the 85 manual on adobe or know where it is?
Thanks in advance,
Bob.
Re: sudden death - brain dead? Ignition control unit?[200/85] posted by Rob Kuhlman on
Thursday, 30 November 2000, at 6:42 a.m.
Morning, Bob!
The "no spark/no fuel" diagnosis suggests dead Hall Effect sensor in the distributor. You need an impulse from it to activate the fuel pump relay. Go through the Bentley procedure for checking the integrity of the Hall sensor -- you'll need to probe some wires with a multimeter.
My '83 stranded me in a motel parking lot on vacation in Maine this summer. I didn't have a multimeter, but I had my Bentley. The symptoms suggested a dead Hall sensor. I had the car towed to the nearest Bosch mechanic (garage full of BMWs, Jags, Rolls -- gees, I knew this was going to cost me...) and I looked over his shoulder while he probed using the Bentley manual. Diagnosis -- dead Hall sensor. He ordered one out from Boston, installed it the next day, car fired up, and we drove back to Penna.
Good luck.
Rob
Re: sudden death - brain dead? Ignition control unit?[200/85] posted by Walter on
Sunday, 3 December 2000, at 1:50 a.m.
Bob, I had the same problems with my '88 LH 2.2 like yours. I went out and found a used ECU for $150 and same problem. I went through and checked the ECU terminals point by point. I found a high reading ground and checked the ground wires on the bolts holding the fuel rail to the intake manifold. Bingo!!! got rid of my problems, was I humbled. Ground should read ZERO, any higher readings you are introducing bugs to the computer.
--walter