my friends car..


Bad idle, Hesitation under load, black smoke

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First and foremost, I have searched.
Secondly, car is an 89 turbo.

Yesterday:
Car died as I pulled out of a parking spot. When I tried to start it up it turned and compressed but did not start. When I blipped the gas starting it it started but immediately died. I blipped the gas continuously after starting it and it would idle at the rpm that I was romping the gas to. I managed to romp it in first and second gear to a friend's house 2 blocks away. Tons of black smoke. A push start also worked but required to romp the gas to keep it idling.

Now:
Car turns but will not start without pushing the accelerator a little. It will than idle a ROCK SOLID 900 WITH NO BOUNCE. If you ease on the throttle it will slowly gain revs. If you hit the gas too violently the car sputters and dies. I managed to get the car up to 40 mph by easing on the gas the whole way up to it. A line up of cars behind me but oh well. As soon as I tried to go into boost or when I went up this huge hill near my house, the car started to buck and I had to downshift and romp the gas to get up the hill.

I have a check engine light that I never used to have.
Brand new AFM.
Engine is not flooded, I removed plugs and cranked the car for half a minute, compression is good and nice and even pops. An odd scraping noise though. Are those the seals?
No vacuum leaks. I have replaced TID, all intercooler piping, and recently (2 days) removed the rat's nest. Could a mis removed vacuum line be a problem? I drove it for 2 days though no problem?

Before it died in the parking spot I had done quite a bit of on and off driving and 2-3 full throttle runs down the highway.

Earlier that day I had adjusted my TPS, Cold Start, and BAC.

What the heck is going on? I am desperately consulting my Haynes and online FSM manuals as we speak checking voltages on all of my sensors. It's raining out and I don't care, I have a drag race to be at by Wednesday.

Edit:

The trouble codes are as follows 5,8,10,11,12,15,18,25 and than all the 30+ codes relating to the removed solenoids. 5-18 list all inputs in the engine such as AFM, O2, etc.
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Cardomain

Mods: A'Pexi Intake, Bonez Turboflo, A'Pexi SAFC, PS/AC/CC/Emissions Delete, Koyo Rad, RB Catback, 17x8 5zigens, FCD, AEM Tru-Boost
In my bedroom: FD Pump, SSQV BOV
In the mail:

 

Is you're TPS known to be good? I wouldn't know what to tell you about the black smoke, but the dying and the massive amount of codes sounds like a problem I just diagnosed myself: There's a very small ground cable bolted to the firewall kinda near the VIN that attaches to the motor behind the intake manifold. It's actually on the motor itself, not the manifold. Mine was completely burned through, and actually melted the plastic coating and connectors. Mind you this was on my 86 NA Auto, so I don't know if you would even have anything similar, but I was experiencing a lot of the same symptoms: the bucking, the dying, endless amounts of codes...

Anyways, I hope that helped you a little bit... I'll try to take a picture tomorrow of the cable I was talking about, I had to clean my engine off to find it, it was so covered in grime and crap!

 

did it throw timing? mine did it once and took me about a month to figure it out.

 

Black smoke=unburned fuel. New AFM, meaning OEM unit? Make sure it is plugged in and the connection to the ECU is good. Could also be a faulty fuel injector dumping excess fuel into the engine.

Remember, with the S5 car the fuel is cut when cranking the engine with the gas pedal depressed. So that is probably why it will start when you step on the pedal.

 

that's more than likely the issue. Restabbing the CAS takes less than 10 minutes and you only need a 10mm socket, extension, ratchet, and phillips screw driver.

when you are finished restabbing it should look like this

 

TPS is within FSM spec and the AFM is not a new unit but from a car with very low miles. I have recently replaced that ground.

It starts and dies immediately if you turn it without gas.
It will start and sputter with gas, than even out and idle GREAT.
But as soon as you try to rev it out of vacuum on idle it sputters and dies. ~2k - 3k.