Elusive1985 volvo 240 intermittent no spark ? Wiring warness ?

Update - I still have not isolatign the problem . Howver wiggling the harness at verios points gets it going. I am pretty sure that it either a bad connection or a broken wire in the harness but I want to check at all the typical places for failure before going all the way replacing/ rebuilding the wiring harnesses ( engine haness ? , ingition harness ? ) . Where ? -thanks

My Previous post -

The last time I caught it not working, there appeared to still be continuity in the Hall sensor , The wiring harness is not great but Ok I thing with the only visible deterioration around the gray firewall connector which was repaired by stripping back and splice in new wire as necessary . Are there any other connection points ( other than the ECU plug, Coil terminals , distributor Hall sensor connections - has Bosch distributor ) to check in troubleshooting this sort of problem ? BTW- does this model have a separate ICU ( different from the ECU located near the windshield washer bottle ) , if so where is it ?

- thanks

>> I've experinced this problem a couple of a couple of years ago and it >> was a bad Hall sensor . However it checks out fine with a meter . >> Could someone please help me with the diagnosis of the problem here . >> thanks > >You say it's intermittant, does the hall sensor check out good when the >spark isn't there? I've heard of the vacuum advance intermittantly breaking >the connection. > >How's the wiring harness? > >
Reply to
nospam4me
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Your 240 uses an ignition system sourced from Chrysler, which has serious problems with the connector to the ignition computer. In fact Volvo recommends changing that harness if it is ever disconnected from the computer for any reason.

Reply to
Mike F

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