djtalon

I have a 89 944 turbo i have not run in a coule of years. Problem is that it idles real bad then stalls, when you press on the gas it cuts right out. ( this is in nuetral with no load) when i disconnect the TPS is idles better but press on ga sit still cuts. Looking at the link module the TPS range is from 5% to 77%.

could this just be a TPS is not ranged correctly or somthing else is wrong?

thanks

dillon410021

is all of the intake hooked up correctly. check all the big connections at the intercooler pipes

djtalon

ye sall pipes hooked up good, when i disconnect the tps and it will idle it has 18 inched of vaccum.

when i disconnect a vaccum line it will idle a little better.

Paulyy

What mode is the master afm in? TPS or MAP?
and what mode is the "ACCEL" mode in TPS or MAP?

djtalon

I have no idea, i am not really familiar with the AFM Link. I have instructions and a spare unit. I know when the car was put away it ran correctly.

Paulyy

next time you go play with the car, turn on the car just dont start it. make sure the hand controler is plugged in. with the controls on the right hand side click up and write down what all the menus say. it'll help.

I'm guessing you're not running an air flow meter?

With a MAP sensor (AFMLink) if you have a vaccum leak, you wont know if running on MAP mode. on TPS mode it might make a difference.
I wouldn't use TPS mode on a turbo car with variable air measures on the same throttle positions and RPM. in other words the interceptor dosn't know how much air is going though the engine.

djtalon

i tried running in both TPS and MAP mode. no difference. when i try to rev i get popping and missing and crap along with the cut out. I tried running in both map and TPS mode. no difference.


will check the values this afternoon.

djtalon

settings are

test rpm = 0
MAP = 101kpa
AFM Master = -14%
ROW STEPS = MAP
Offline = 2.01 VECU
Store
ZN AFM 600 0%
LGE ZN = 2 -4%
ACCEL - T z=0 5%
Edit Z 0 -14%
RPM SW XXXXXX off
OXY 1% .9V
Min Clamp .49V
Mac Clamp 5.00

djtalon

Not sure why but if i disconnect the exhaust the car revs alot better? FYI the car has sat for a number of years. and at idle the vac might be low, i thought it was high but this time it was around 5

djtalon

ok, some progress. I plugged up the two larger ( 1/2 inch maybe) ports commin out of the intake manifold and the idle got alot better. maybe will idle around 1100 if i turn the adjustment screw. you can also rev it ( a little popping or backfire maybe)

so i think its a vaccum leak, what does all that junk under the intake do? do i need it?


thanks

Paulyy

settings are good.

1/2 inch intake port? Where does it come from?

Mine will idle around 15 InHg with the afmlink with no airflow meter.

djtalon

When i blocked off the hoses for the Idle Control Valve and the other one next to it the idle got better. The CV is already gone. Gonna replace the hoses under the intake manifold. Is the lindsey kit good?

Also what O2 sensor do you use for the AFM box?

My O2 harness for some reason is disconnected.

Paulyy

so you've got no ICV?
does it stumble when it's warm?
the other hose is for the brake booster.

I've got the lindsey kit in my 86 and no issues with it so far.

the Link uses a narroband O2 sensor. it only reads 0-1V IMO it's pretty useless.

djtalon

The cyclic valve i think is gone, it does have an icv. i think the problem is with some of the hoses down under the intake because when i blocked them off the engine ran better.

thanks
dave

Paulyy

oh the cycling valve, it wont have anything to do with the idle. it's only boost related.

Your best bet is to take off the intake manifold and have a look.

What if you block the hose on the intake closer to you (the one goes to the ISV) if it makes your car idle better, your ISV might be faulty/stuck open.