Hesitation.... Tps?

[hecticrb25]

For some reason when i start my car up first thing in the morning it hesitates if i pump the accelerator a tiny bit untill its been on for about a minute or so.

Lets say i start it up, its idling nice at about 900rpm, i pump it a tiny bit and it drops and fluctuates at 500-400 rpm for a second or so and then jumps up to 1000-1300 etc.

Could this be the TPS, only thing i can think of as I swapped over to a Q45 throttle body (but used my old TPS that was on my old throttle body, came off a S1 RB25 so it was all good to swap over). Anyone know what the TPS should be reading at closed and at full throttle?

And before you say it yes i have removed the water valve spring (valve that holds the throttle open a tiny bit untill warm water flows through to close it)

Thanks!

[Adriano]

I would try putting consult on it to monitor the sensors and check for trouble codes

[hecticrb25]

It has a PFC installed, anything i can check with the hand controller?

[tek_01]

also try cleaning the aac valve if you havent already

theres a DIY in the tutorials section

[hecticrb25]

Yeah installed a Greddy intake plenum not long ago, AAC got a good clean while it was off

[Adriano]

Is there anything else done to the car before we try to diagnose the problem?

On the sens/sw screen there is an idle switch, make sure it goes on and off when you crack the throttle

[hecticrb25]

Ill check that tomorrow and let you know

Nothing else really done, only started happening when i installed the greddy plenum, idles fine so cant be the plenum installation only happens when the accelerator is depressed which is why i assumed it might be the Q45 TB or TPS.

It just seems a bit odd that it only does it when its dead cold, meh.

[hecticrb25]

yeah the switch goes on and off as i crack the throttle. when its on for a bit it is fine, its only on the initial startup... never happened before i had the standard plenum\TB on.

[QWK32]

what is the tps voltage when you aren't pushing the accelerator? round 0.4v - 0.5v is good.