4g61t.org

Had the iac cleaned and checked..still stalling.i ve been reading it could be a bov issue.could that cause the stalling?I am not running a bov at the moment could that cause this issue??

T

Does your car have a turbocharger?

Yes, its a 4g63 t engine

And you do not have a blow off valve?

At the moment no

....okay. So what did you do about the giant hole in your charge piping where your blow off valve used to be?

I dont have the standard pipiing the engi e is fitted on a 91 lancer glx and its very hard to obtain parts in malta because the galant was not imported here nor was the colt gt so ypu have to make do.

Understood. How about some good pictures of the engine bay?

Go to the pics and vids thread if youd like anf some pics of my car.there is a pic there of the engine bay to get an idea.

Ok, from those pics, you have no MAF, and no visible BOV.
I think there's something funny going on here...

_________________
Early 2000's: 1992 Summit sedan - 14.1 @ 100.9mph w/ 155/80 13s
2012: 1989 Dodge Colt GT Turbo - 14.9 @ 100mph, 10psi/s16G

You have a good eye!!i installed a maf senser since taking the pic.

Maf needs honycomb to straigten the airflow and get an accurate reading at idle


Any unmetered Ir leaks betweek maf and intake valves will cause rough running.

_________________
If speed kills, then i shoulda been dead awhile ago. There is no such thing as "Too Much Power". There is no excuse for a lost race. Do you view the rev limiter as a fun limiter?or as a shift point? And we all know, more boost=more fun.

The honeycomb is there i also swapped the filter tp the one whoch came with the maf senser.i dont think it is awiring issue because at first it was ok,but then the problem with the stalling and high idle increased.

Maybe it's a vacuum leak?

_________________
Had a:
1991 Eagle Summit ES Hatchback - 4g15 12v 5spd
1991 Dodge Colt -4g15 12v 4spd
Have a:
1978 Oldsmobile Cutlass - 468BBO TH350
Round 3:
1990 Dodge Colt-4G63T 5spd

Alright was this a 4g15 equipped car originally, and does it have the 4g15 fuel pump still installed??

No BOV?? Really ... you need to fix that for sure. Turbo will surge when shifting and cause issues with the intake charge on decel. Simple part to find overseas (US or anywhere) and install into a pipe inline. Then you run a vacuum line from the BOV port up to your intake manifold port, likely one of the larger copper looking ones. Do you have functioning block off rubbers on the extra ports on the intake manifold right now?? If they crack with heat and time, they will leak for sure!

Okay, for stalling and high idle, there were lots of tips posted in your thread, from a while back. I just read over them again.
Have you got coolant hoses running to the throttle body and back to the heater core on the firewall?? Has the cooling system been bled of any excess air bubbles and do you get really good heat from the dash with the engine hot and the engine at idle??

Suspect parts - Idle Stop Switch on top of the TB, was it confirmed to make a ground contact and is the little plate in place from the screw on top of the TB to the nut/bolt that is one of the four that hold the TB in place? That metal plate gives a ground path back to the engine/firewall for the ISS. Very important to have that checked.

Next is the ISC, but you had that cleaned and likely it OHMed out okay with a multi-meter/DVOM (digital volt/ohm meter).

As Crackerman posted, you need to check the FIAV operation, it could leak internal to the TB which means pulling off the big plate on the bottom of the TB. There is a gasket that can crack in that area and leak vacuum and then boost when the turbo is spooling/spooled.
Here is a 91-94 DSM style o-ring for reference: https://www.rtmracing.com/xcart/product ... 603&page=1

Do you have a Palm Pilot or small logger tool that can show you the data coming from the datalogger port on the car?? This is very helpful to see where the ECU thinks everything is set to. We can then determine where the TPS sensor is set (is it within the factory range for idle and does it see WOT wide open throttle when pedal is fully applied), and many other variables.

Timing - was this set with the firewall harness plug grounded, and the datalogger pin at the port inside the car, grounded also, AND the engine coolant near full operating temperature?? Does the car have a proper OEM thermostat installed ?

Once we know all of this, we can find out more.

P.S. What is the vacuum you get at idle, cold and hot.