1g randomly stalling out

[triggerx]

Ok I have had this problem for awhile now, seems to have came up out of nowhere and so far no luck fixing it.

Basically the car will sometimes die during the idle. Ill go outside, start the car, and sometimes itll just die. OR idle for a good 3-5minutes then die. Either way I doubt my car can hold an idle for more then 10 minutes for sure. So how long the car is actually able to idle varies.

Since this is the case, sometimes my car will die during a turn if im slowing down and not accelerating through a turn.
So it seems like the car can only die when the rpms get too low in a neutral position.(ie:clutch pushed in,idling in neutral)

As far as I know, i have no cel lights on while im driving. The car never turns off while giving gas(so this may be clue) and Im usually just able to start it right up.

Once or twice, it did get to a point where the motor was just turning and the car wouldnt start, but im overlooking this because it only happened after repeated attempts to get the car to idle right.

Another symptom(which may not even be related) is the car seems to hesitate under heavy acceleration. Possibly the fuel pump is barely keeping up with the turbo, IDK. Its a stock 14b turbo I think, with an afpr, and Ive set the mbc to 10-12psi.
Also occasionally I see white smoke coming out of my exhaust. usually means condensation or water of some kind. But im not smelling any coolant.

I thought it was the isc, but I replaced it with one from the junkyard(checked out good on resistance), however I still have the problem.

Im just hoping its not an ecu problem again, Im on my second one.

Any ideas?

 

[92AWDHX40]

How is it tuned, any boost leaks, could be fuel, wires, anything go through a lot of stuff, do you have fuel? Maybe a bad ecu, or have it sent to ecmtuning for a check up, or rebuild to make sure its right. BTW love Arizona.

 

[triggerx]

Its not tuned at all honestly.
Im only running a 3'' exhaust, afpr, 14b turbo at no more than 12 psi, and an intake pipe.
As for fuel, I know im getting at least some, I pulled that hose running into the fuel rail and fuel came out.
Honestly the car usually starts everytime, Ive gotten into the habit so much that most people dont even know the car just died because I turning it back on is so automatic to me now, but Its annoying.

Yeah its a nice place for sure, im originally from michigan myself.

Also is it normal for the isc to make noises in these cars? I hear the isc is a culprit for many idle issues so I replaced mine ### while the key is in the on position it makes static noises. Put the junkyard one in and its doing the same thing.

 

[triggerx]

Alright Im running out of ideas and have been searching this site for awhile now, anybody have this problem who has actually solved it?

Heres the thing Ive replaced
ECU
ISC
Wires and Plugs

Whatever this problem is, it seems random if anything, I cant pinpoint when it happens it just happens.
When the RPMS get lower or drop to fast is when it is likely to happen.
For example, Im going 45 in third gear and decide to shift it to neutral.
The rpms will lower and wont always catch and instead just go to 0 and shut off.


My car shifts fine, I dont think it has anything to do with the transmission because the car will stall out even if its just idling.
However there are times where the car will remain running fine for a good while, like i said the problem is pretty random.

BTW Im still searching similar threads such as

http://www.dsmtuners.com/forums/newbie-forum/357287-strange-strange-problem-help-please.html

http://www.dsmtuners.com/forums/newbie-forum/349641-bad-plugs-make-car-die.html

 

[triggerx]

alright, the fuel filter is cheap enough ill probably just buy a new one for the hell of it.
This problem is annoying.
Honestly the car drives fine minus this problem, and giving it gas is the only way to keep it on when I know its about to cut off.

BTW idk if this helps at all, but sometimes my radio cuts off randomly as well.
IDK if it would be a possible short or bad connection somewhere though, ### like I said, the car only turns off when slowing down or the rpms drop too low. If Im constantly giving it gas its not a problem.

 

[LaserRS92]

You can always check your isc with a simple volt meter by checking the ohm resistance across the 4 terminals in pairs. As far as no tuning it might not be a bad idea to go back to a factory fuel pressure regulator and get some things back to square one. At that boost and power level you don't need and adjustable unit yet anyhow. Btw, is that fpr you have on there right now a rising rate regulator?

 

[triggerx]

You can always check your isc with a simple volt meter by checking the ohm resistance across the 4 terminals in pairs. As far as no tuning it might not be a bad idea to go back to a factory fuel pressure regulator and get some things back to square one. At that boost and power level you don't need and adjustable unit yet anyhow. Btw, is that fpr you have on there right now a rising rate regulator?

Ive actually checked both iscs, and they all tested good in terms of resistance, but I swapped to the junkyard isc i had, and the car remains the same.
Not entirely sure since the fpr was on the car when I bought it, however its made by aeromotive if that gives you any clue.

So far possible solutions from research have showed me and my thoughts on each

1. MAS
So far it just seems like my best bet
2. Electrical Connection somewhere is bad
Maybe, however if the car is able to stay on under acceleration I dont see how this is an issue. If it were a matter of connection, wouldnt the problem occur regardless?
3.Throttle Body
Another likely culprit since this is where the fiav is located as well
4. Fuel filter or Fuel Pump.
I'm going to replace the fuel filter regardless, however Im not totally convinced, if this were the issue the amount of fuel I have in the tank should also affect my idle. I would think the problem would be a tad worse if the fuel were lower right? especially considering at that point the pump is no longer submerged and is probably working even harder to get what little fuel is in the tank. And Ive had my tank pretty low.

Another observation I made while looking at the connector that goes into the ecu, pin 6 doesn't go as far out as the other pins? its kinda pushed in a little more, so thats probably worth looking into, I believe its the idle position switch.

****QUESTION****
So I unplugged my maf(or mas?) while running and the car just dies, or if i start it then unplug it the car will die immediately, is this normal?

Also unplugging the O2 Sensor really didnt affect anything in terms of idle and no check engine code

-----UPDATE-----
Ok, I replaced the fuel filter(kinda bent the fuel line in the process, but the car does run better performance wise after the fuel filter, plugs,wires, and new ecu) However the problem is still not solved.
Think Ive made some headway though.
Took the car up to autozone and had them test the alternator, apparently it was bad

 

[triggerx]

Ive seen this occur on many 1gs, and a lot of the threads have no solutions, but I fixed my problem.
So this is just advice to anyone who may have similar symptoms.

Symptoms
-Car not idling properly or shuts off randomly
-Car shuts off when RPMs drop really low, usually happens during stops or while turning going slow.
-Weird clicking noises at isc
-The car NEVER turns off under acceleration


There was a bad connection at the ecu where the connector and the ecu meet.
Seems that the wire going to the idle position switch wasn't locking in the connector piece.
After replacing the yellow connector and cleaning off the battery posts and connections the car runs fine now.

So checking your wires is a definite must when facing this problem.

 

[93_Ludachris'Tsi]

I must say I have the exact same problem happening with my car as well, and this has been a big help, because I've changed the ISC, and swapped a new ECU in it but the problem still persist. It seems like all my connectors are plugging into the ECU securely, so im just at a loss man.

 

[Rsawd95dsm]

Have you bosst leak tested it recently?

 

[2gDSM6bolt]

i would definitely check for vacuum leaks because it is happening when you are off the throttle because when you are on the throttle you are creating vacuum.