supra TT manual stalling after driving on boost and a RPM problem, HELP?

[Guest supra_jay123]

hi everyone, i have a 94 supra RZ TT manual, i have 2 niggling problems im hoping someone can shed some light on...

 

1st is when i drive the car on boost giving it some, soon as im coming to a junction and put the car in neutral the revs drop and she stalls however if i drive off boost or light on boost she doesnt stall, any ideas?

 

2nd is from a standing start or 1st gear out of a junction; if i take her all through the revs ready to change at just below 7k RPM shel feel like iv hit the redline at 6000RPM and the same in 2nd gear yet 3rd gear onwards are fine and will happily climb to 7000RPM, any ideas?

 

the car has no electronic gizzmos whatsoever and only BPU mods are Exhaust and induction kit, no other mods.

 

my thoughts for this one is the small turbo on its way out but hopefully you guys know?

 

Thanks

[heckler]

could be running rich, something similar happened to mine. btw, both the turbos are the same size

[Guest supra_jay123]

hi Si thanks for the reply, if its running rich how much am i looking at to resolve the problem? im new to the supra scene.

 

also shall i stop hammering it til i sort it out n case i do engine damage?

 

Thanks

[heckler]

hi Si thanks for the reply, if its running rich how much am i looking at to resolve the problem? im new to the supra scene.

 

also shall i stop hammering it til i sort it out n case i do engine damage?

 

Thanks

 

could be the O2 sensor... might need a clean - failing that, get it to a specialist.

[Guest supra_jay123]

oh okay mate thanks for your suggestions, iv emailed THOR Racing as there closest to me so hopefully i can book her in and get it sorted.

 

Jamie

[kaahari]

Had quite same broblems couple of years ago, car stalled sometimes after boost, broblem was idle control (valve/motor, only needed a good cleaning). It brobably stucked close etc...

[Homer]

I'd go with the above too - sticky ICV, had the same on my TT many years ago as it's always want to stall when the engine was very hot. It can be cleaned out as they can get a bit gunky. Easy ish job to do.

[Supra Gaz]

Sounds like ICV, that or the O2 sensor (as already mentioned), on boost it sounds like it is hitting fuel cut? Loved the hammer comment, i can just imagine a bloke smacking the block with a mallet shouting at the Supra to work!

[marc_p]

As has already been said, it's probably the ICV at idle and Fuel cut at 6k.

 

Maybe worth buying an FCD

[Ian C]

It won't be the O2 sensor as you'll be out of closed loop. Either stuck ICV or overfuelling in general for some other reason. In fact, if it doesn't try and stall when driving off boost then the O2 sensor is deffo working as it'll be trying to reign in any overfuelling issue by using closed loop fuel adjustment.

[wewsupra]

hi Si thanks for the reply, if its running rich how much am i looking at to resolve the problem? im new to the supra scene.

 

also shall i stop hammering it til i sort it out n case i do engine damage?

 

Thanks

i got this problem as well,im going to clean idcv but as said if running rich how do u fix that please ..

[TheTurtleshead]

My Supra is doing exactly the same thing. Wont idle after driving on boost, but will start straight again and run fine, although sometimes it then idles a little low. Also im sorta hitting an imaginary redline at 6k when accelerating hard. My car is stock HP but with a 2nd decat, FMIC, and Nur spec exhaust. Im going to be changing the Map sensor, O2 sensor ECU temp sender and ICV soon, one at a time, to try to eliminate the problem. Oh yeah and im also going to fit a Bosch 040 pump, as my car is an NA-TT conversion. Is ours a TT from stock? I Would like wise love some help with this! As whilst im great with anything mechanical or carb'd, fuel injection, efi and the electric side of things are beyond my comprehension at the mo, so its trial and error atm!

[Guest supra_jay123]

Thanks for the replies, i appreciate you all trying to help. im having a FCD fitted soon by keron and im removing and cleaning the ICV saturday so hope they both sort the car out otherwise its a fuel pump and have the sensors tested. Kind regards