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Still stumbling, possible AMM 200

posted by  someone claiming to be Duggernaut on  Fri Aug 27 06:56 CST 2004 [RELATED]

Still havent diagnosed my 1987 240 yet. In brief:
It has a rough idle, stumbles on acceleration, little power, does fine above 40 mph but sometimes stalls when coming to a stop. The tach will also drop to zero for about 30 seconds.
Cannot find vacuum leak. Actaully I found one in the flame trap vacuum but clearing it and replacing the flame trap didnt help. Fuel filter was replaced, air filter replaced, plugs are okay.Fuel pressure regulator seems fine. It idles higher when vacuum tube is taken off and the fuel test shows its pumping through at a reasonable rate on idle.
One brickboard poster suggested the Air Mass Meter. I did the test between the 2nd and 3rd relay. The range is 3.5 to 4.0 ohms. Mine was registering 3.2 Is this far enough out of range to warrant replacing? The other test said the relays should read 108. I got 20.8 ohms but think I tested wrong.
I'm reluctant to replace the AMM without a confident diagnosis.
ALso when I unplug the AMM the idle is the same but when I step on the gas it stalls. So I don't think its completely dead.
Can anyone second the diagnosis of the AMM?
Thanks.
I think I'm getting close here.





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New Still stumbling, possible AMM [200]
posted by  someone claiming to be Duggernaut  on Fri Aug 27 06:56 CST 2004 >


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