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'87 240 has serious stumble off-idle. 200 1987

posted by  Volvodad on  Wed Aug 16 17:13 CST 2006
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last visit: Thu Oct 23 16:18 CST 2014
[RELATED]

You mean that if you accelerate very gently the car will get up to speed and hold there? That doesn't sound like a bad AMM. A failed AMM should give poor running at anything above idle.

Before you spend on a new or rebuilt AMM ($$$) make sure there are no vacuum leaks around the manifold, or air leaks in the accordion ducting from the AMM to the throttle body. There are few bigger frustrations than spending a bunch of cash on a cure, only to find it makes no difference at all.

I had a very similar problem, and after removal and careful inspection, found a split in the ducting, at the 'bottom' of a fold. $5 at the PnP yard for an airtight duct cured it completely.
--
Bob (son's 81-244GL B21F/M46, dtr's 83-244DL B23F/M46, my 94-944 B230FD and 89 745 (LT-1 V8); hobbycar 77 MGB, and a few old motorcycles)






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