What could it be?

[memo226]

I have an 89 turbo, when i rev it and return to idle it will then drop afr to 10.0 and try to shut off, vacuum reads 20. I took a video to show everyone what its doing any help would be greatly appreciated.

http://www.youtube.com/watch?v=ofuDgsDWAaE

 

[supraguy@aol]

Codes?

And your windshield has more crack goin on than downtown Detroit.
It scatters the light from your low coolant warning all over the place.

 

[memo226]

Code is 52. And ya I know im trying to find a new windshield along with the 89band front bumper

 

[JStoked]

tps? has it been adjusted?

 

[SupraTurbo_MK3]

Are you venting to the atmosphere?

That a/f meter won't be very accurate, in fact it's almost useless......You are much better off upgrading to a wideban sensor

 

[hvyman]

Code 52 is knock sensor.

 

[memo226]

No tps has not been adjusted. Will do it tomorrow. Yes I have only a blitz and it vents to atmosphere but its never done this. And would a knock sensor do that?
_

 

[supraguy@aol]

Does it stumble and go rich if you rev it, but don't pop open the bov, or is it just after the bov vents?
If you vent a bov to the atmosphere, the metered air going into the engine(x) immediately after, was measured with that vented air(Y).
So the ecu supplied fuel for X+Y, when it's really only getting X, thus a very rich condition, and very well known from those who have used
atmospheric bov's on a stock air metering system. I can't tell you why you haven't seen this before.

 

[memo226]

I will stumble with Bov closed . It wont do it sheen it releases the pressure it seems