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740 Turbo has no power: UPDATE 700

posted by  swede242 on  Wed May 14 03:16 CST 2003
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last visit: Fri Aug 4 19:14 CST 2000
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Thanks very much....those suggestions are all in the area I was suspecting. I did completely unhook the AMM from the airbox, in the event the filter, etc., was a culprit. I had a 91 940SE several years back that acted this way although it wouldn't run at all. I would be driving and it felt as if someone "unplugged it" and it just coasted to a stop. Turned out to be all that rediculous foam Volvo glues to the inside lid of the airbox was coming off in small parts and blocking off the AMM. I did check the AMM on this 87, by covering it with my hand (it stalls) and just unplugging it (it stalls) so I 'assume' it is working. I have a friend who also has an 87 740T that runs great, so I can try out his AMM as a Plan B if it points back to that.

Is there a sure-fire way to check the CBV for failure? Or perhaps a given vaccuum line to remove to see if something is/isn't working? What perplexes me is that the car runs so solid at idle, but nothing beyond that (and I mean absolutley NOTHING beyond that).

My other fear is that its something transmission related. Car does have 190k on the clock. I have a low mileage 93 complete drivetrain waiting in the wings, as I was aware the 87s have a weak bottom end anyways, but didn't want to climb that mountain....YET.

Thanks again very much to everyone in advance :)






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