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240 no start - LH2.2 ECU FI-weak? 200 1986

posted by  sideswipe on  Tue Sep 27 21:59 CST 2011
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last visit: Fri Oct 11 00:21 CST 2013
[RELATED]

Hello,

I've checked everything, fuel pressure, spark, noid light flashes, exhaust free, disconnected AMM, wiring harness and grounds - perfect. Last shot is a used ECU to see if that helps a potential 'weak' transistor not letting the FI open (low current). The voltage drop from the battery + to FI + pin is 0.25V and from FI (-) to ground about 9.5V (reasonable given the low duty cycle).

Has anyone seen a faulty LH2.2 544 ECU? They are apparently very robust.

The car starts about 1 out of ten times.

(I thought I was on to something when I found that the red-black wire from the ECU to ignition measured 4-ohms, but the OD relay (automatic) shorts this to ground via the OD dashboard lamp. Not the problem.)

Any thought s before I buy another ECU (the old, flashes a noid light)would be appreciated. Thanks.

TM






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