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occasional stumbles, then no start
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Posted by mag [Email] (#1906) [Profile/Gallery] (more from mag) on Thu, 5 Jun 2003 00:30:33 Share Post by Email
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1986 900T. File under intermittent rough running, no-start, ECU grounding.

It would occasionally stumble, with the engine sometimes warm, sometimes cold. Tuesday it stumbled badly half a mile after starting. Wednesday it started and RPMs bounced wildly between 0 and maybe 3000. Shut it off. Swapped in spare AMM. No change. Swapped in spare ECU. No change. Turn engine off and it won't start. Strong crank. Check fuses.

Swapped the LH and Fuel relays. still no start. Get more tools and Bentley.

Jumpered the fuel pump relay and the pump runs. Voltage a tad low, tighted the connectors, and voltage is now fine.

Started the ECU harness diagnostic sequence. No continuity between pin 5 and ground. Traced the black wires thru the harness to the ground point at the lifting eye. no apparent breaks or frays or bad insulation, but I didn't look inside the part of the harness where it passes thru the inner fender. The ground bolts had been tight. I removed the ground screws to make slack to work with the harness. reconnected it all.

Now there is ground at pin 5. Finished the diagnostic, reassembled the electricals, and the engine starts fine. RPM's bounce around for a few seconds and settle down to a slight oscillation around 800 RPM.

I'm really unhappy about this because I think I have an intermittent ground connection which I jiggled, but did not fix. Hmm. Maybe I need to scope out the ground strap between the block and the chassis.

Does anything here sound familiar that someone might comment on?



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