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Thanks David, I am trying to figure out if it's a fuel or spark problem.
That's the "chicken or egg" question here... I do have a timing light so I ought to be able to see if the spark goes away when the stall occurs. I almost wish it was worse so I could find a definitely bad component- but every time it restarts, everything is back to normal.
The 240 doesn't have a track record of hall sensor failures, but it does behave like one... identical stall to the effects on our 88 740 a couple years ago, when I had to replace the distributor.
In checking it out I did find a loose plug at the throttle switch, but securing this didn't seem ot change anything, and I wouldn't really expect it to prevent stalling... might help with idle recovery though.
It's weird, I haven't come across a car that would stall at idle like this. This car, in fact, had a stalling problem before from the plug at the AMM, which made it die under hard throttle- I could make it do it in the driveway regularly, by holding the brakes and applying power in drive. Tightening up the plug made the problem go away, until this event today.
I think I will plan on doing a power stage anyway. I have to rule that out. Usually my experience with those is, all or nothing- no start once it goes bad. But a 740T I saw recently had an intermittent stall before it came to the shop with a no-start. That one was the power stage. I'll try it and let you know what I find.
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Rob Bareiss, New London CT ::: '87 244DL/M47- 221K, 88 744GLE- 202K, 91 244 181K, 88 244GL 145K
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