4G63 - Fuel cut under boost and stalling?

[carrot76]

I've been having this problem for a while now.

The car "stutters" under anything past half open throttle, and also stalls when pulling up at lights (basically whenever I have the clutch in).

The cars been to several Auto electric places, as well as different mechanics, none of whom have been able to fix the problem.

The closest I've gotten was the last mechanic, who advised me it is a fuel cut issue, & that there seems to be bad wiring from the TPS. As far as I can understand they disabled the TPS, so the ECU wasn't getting false info.

This seemed to fix the problem completely, and I could drive the car really hard, WOT without any problems, although it did sit at around the 2K mark when Idling?

Then 2 days ago (32 Degree day) it starting stalling at the lights again.
Yesterday (38 Degree day) it started "Stuttering" again, about 20 minutes into a 45min drive home from work.

Would the fact that it was hod on both days be just a co-incidence?
The car is also running a pod filter, which is currently not heat shielded and doesn't have a cold air intake setup, so it just sucks the hot air from the engine bay. Could this be part of the problem?

Any help greatly appreciated.

 

[MADVR4]

ok a few things

check ur alternator is working properly... the engine is so hot and they put the alternator right next to turbo and mani it melts them down... i know ive done 3 rebuilds....

boost leaks from cooler pipes?? check that... if ur not running stock BOV make sure the tension is correct and its not leaking thru there coz it will stall alot from that....

ECU?? u have done a 24 wipe or whateva it is
take off battery over night...

what psi u running maybe back it off to stock and see if it still does it??

hope this helps

Grant-

 

[CLuTZ]

I'd be checking these things........

ECU- capacitors.
Fuel pump-
02 sensor-
Vac leaks in your intake.

 

[Entaran]

I had this problem on the N/A galant. I ended up heatshielding all the wiring anywhere NEAR anything remotely hot, and the problem went away.

Hotter wire = increased resistance in the wire = current reduction = no signal.

 

[carrot76]

Car is only running about 8-10 psi, and the O2 sensor was checked when the problem was temporarily fixed last time.

The mechanic also checked the fuel pump, and it doesn't seem to be missing a beat at present.

The whole Circuit board was reco'd and the capacitors replaced only about 2 months ago?

Not sure how I check for leaks in the intake pipes? Can anyone help there?

The heat sheilding idea sounds like a good one & makes sense too. I've always had electrical associated problems with turbo cars that are compunded whenever the weather gets really hot

Thanks for the other suggestions too, much appreciated. 8)

Any other ideas, feel free to post 'em!

 

[JETGSR]

check the igniter!

if you get water in them /condensation etc or it just shits itself you can get the same problem

You need to put a good known one in not just test it!

JETGSR

 

[joe-ness]

omg dude i had the same problem a few weeks ago car stutter really bad i checked everything. does it stop making power after a certain rev ? if so try changing ya spark plugs i did it to my car and bang instant power back !! make sure to get good sparkies (NGK plattinum) not the cheap shit

joe-ness

 

[carrot76]

That's the confusing part. The car was fine after it's last trip to the machanics, up until Monday & Tuesday of this week when it was about 30C on Mon & 38C on Tues,

It was overcast yesterday, maybe 24C - and the car ran without stalling or stuttering both to and from work, which is a 45-50 minute drive each way!! :?