Coming home this afternoon I tried to accelerate up to 60MPH from 55MPH and the car seemed to fall on its face. It had no power. The car smoked like crazy until you let off the gas. The smoke is a bluish white color. The car starts, idles, and get up to speed fine as long as you take it easy. If the car is in park and you rev the engine up it will not smoke. It only smokes under acceleration. Any ideas?
Thanks,
Len

The Air Mass hose seems to be fine. I just realized that the heater and temp gauge are not working. I assume that my thermostat is stuck. After driving the car, you can put your finger in the coolant resivoir and the coolant is basically cold. Could a sensor be telling the engine that it's cold and needs more fuel? I checked the OBD and there is no code.
Thanks,
Len

Yes you may run rich if engine can't heat up but that would produce black smoke. You should change that thermostat in any event.
Air cleaner OK?
--
David Hunter

I once had a similar problem on my NA 88 740 which had the same engine and set up as yours. It was caused by collapse of the bellows tube leading to the throttle body. When I gave it a lot of pedal it would collapse, this in turn cut off air flow to the throttle and created an unusual vacume in front of the throttle body, oil was then sucked in through the flame trap. The problem was repeatable just by by giving it a moderate amount of pedal. Blue smoke and almost total loss of power. As soon as I let off the gas the bellows tube would pop back to normal shape and car would drive normal with no smoke. The tube was old and had been weakened, very soft on the bottom. One day when I looked under the hood after an incident I spotted it collapsed, it had not popped back. Replacement of the bellows tube solved the problem instantly, putting in the old tube brought the problem back.

Upon initial consideration of this syndrome one might say BS because we all know vacume decreases when throttle is opened, but that is manifold vacume. There is also a separate and very slight vacume existing between the air filter and the throttle body which increases when the throttle is opened. This is due to a much increased air flow being drawn in through the filter. I suspect that a very dirty air filter combined with the weakened bellows tube would contribute to the syndrome.

Some may doubt all this but thems my thoughts and that was my experience.
--
David Hunter

Makes sense to me. The air filter obstructs the flow of air, even if it's brand new, so there's always a little underpressure in the bellows no matter what. Opening the throttle increases air flow into the engine, and increases the pressure differential across the air filter: bigger air flow across the filter -> bigger differential. Since the air is sucked past the filter, the pressure past the filter -- in the bellows -- is always a tad lower. Manifold vacuum is a yet different beast -- basically speaking throttle body is just another obstruction. So you have two "vacuums":

no underpressure ==> air filter (small obstruction) ==> low underpressure
==> throttle body (big obstruction) ==> big underpressure ==> suckers (cylinders)

;]

Cheers, Kuba

Yes... That is basically what i said.
--
David Hunter