87 900 running way too rich NEED HELP!

ok so I have an 87 saab 900 spg that i just replaced the motor because i fried the pistons in the old motor (running 18psi through stock turbo,pistons and rods) but so I got the new motor in and all the performance components back in but the motor is still running way too rich and can't figure out why. I've tried about four different computers i had laying around, checked the timing, checked all of the wiring twice, tried the stock fuel regulator and the non turbo style, checked all of the fuel pumps and but a different set in just to check, and my dad tried a couple other things to see if it was it (he is a certified saab mechanic and the only one in nebraska) so we are just really confused on it all. So if any one can help at all or just through out some ideas i can try just for the sake to try that would be stongly helpful? so anyone if you can help please i need it.

[grif900]

maybe someone dropped the air mass meter on the floor during the engine swap.ive found them to be very sensitive,and irrepairable.not to mention to expensive.
i dont know if there is any way to test them.but when ever my saabs failed an emission test or smelled too rich a new new one allways did the trick. how does it run while warming up?

[Jim Mesthene]

Air mass meter, NTC sensor or wiring (measure at ECU), high fuel pressure, ECU (sounds like you ruled that out), large vacuum leak, ruptured fuel pressure regulator diaphragm. That's the usual list for extreme rich running.

The car starts up and idles low almost dieing then gets back up then when you first start driving it, it will dog on me a lot not dieing just jerks and misses. But I have checked all the wiring tried three differnt air mass meters a couple different ecu's, checked the ntc sensor and have tried two pressure regulators (the turbo version, and non turbo version) also have all new silocone hoses and vacums so there is no leak and nothing has helped.

[Jeremy]

Did you check to see if the fuel return isn't clogged? There might be a stuck check valve in there someplace.

We have checked all the fuel return lines we used a fuel gauge to check the flow through out the whole car and made sure nothing is being blocked off or stuck. As you can see that the problem is something differnet then it should be from just running rich and that is why we are having so much trouble fixing it. But thanks for the help and if you guys can think of more im listening to everything.

[gorper]

Originally Posted by turboAERO

performance components

What injectors are you running? What fuel reg?

[SteveTheFolkie]

Might be a dumb question - but is it possible that your cold start enrichment circut is stuck OPEN ?? I ask 'cause that happened with my sons VW - same fuel injection system - nice fluffy black sparkplugs and a solid 18MPG - in like fashion if the aux air valve is failing to open OR if you've got a clogged air filter (or obstructed intake) you can run real rich real quick -


Steve

[Jeremy]

hmmm...

Might want to double check the resistance from the "new" AMM, I can't remember the exact resistance but it should be easy to look up.

These might be wild shots, and probally mostly wrong (people here will let you know how crazy my thoughts are)

1. Shorted Injector Wire(s)
2. Faulty Throttle Position Sensor (thinks it's closed all the time)
3. Stuck Turbo (slowing/hindering air flow?)
4. Do you have a cold start injector?
5. Clogged intake manifold
6. Clogged throttle body
7. Dead animal in the air intake

[900t]

Originally Posted by SteveTheFolkie

Might be a dumb question - but is it possible that your cold start enrichment circut is stuck OPEN ?? I ask 'cause that happened with my sons VW - same fuel injection system - nice fluffy black sparkplugs and a solid 18MPG - in like fashion if the aux air valve is failing to open OR if you've got a clogged air filter (or obstructed intake) you can run real rich real quick -


Steve

I think someone needs to do a goooood HARD run through the gears to Vmax a few times!

Even if it doesn't solve anything it's still worth it

My car is the 16v model (saab only put the coldstart on the 8v)but i do have a cold start throttle body im gonna rig up to run water through the intercooler. And as for all the intake clogs, I have all new custom piping and everything was taken off and cleaned out before we put it back on so there is nothing inside anything. The only thing I saw I was wondering about was the "stuck turbo" just curious on what you mean by that and how can I check it out?

Again thanks for all the help here is a couple pics of my car and engine (i do have a cold start body on right now but its not hooked up were just trying everything we have)

[grif900]

you know stuck, dosnt turn, just sits there blocking things up.

ive had it happen only once.i thought my motor was junk, and decided to autopsy it. ill admit i got lucky, but pulled the exh. elbow from my turbo to turn it by hand. and much to my dissmay it was STUCK. so i tried to turn it a little harder,still nothing. i decided the turbo was junk and got out some pliers(leatherman) and grabbed the nut in the center of the turbine and turned it hard. thats when i heard a shrill metalic "plink" and a chunk of carbon found its way into my eye. but the turbo turned very smoothly.

check it out it could be that simple,or not.youve got me guessing too

Ok I see what your saying, but i've driven it and my boost gauge is saying its doing like 5-6psi so i dont think that'd be it, but i really have no idea. All i know is it starts fine but idels rich right away, but we did just put on the bosch 24lbs per hour blue injectors and the 3.0 bosch fuel regulator and it does idel better just still to rich and smelly.