4G63 Idle fixed via TPS adjustment and throttle body replacement.

Galant VR4 TPS adjustment to fix idle surge related issues using the factory 4G63 ecu and related hardware.

**Long video**
Max's Galant VR4

Idle surge 99% fixed.

1% being stepper motor/ idle valve related which simply goes crazy when connected.

Another day spent on Max's Galant VR4 in order to get to this point where the engine is now stable enough that the car is OK to test drive without the threat of stalling.

What the process involved:

1. Measure and adjust tps. 0.63v at zero throttle is the target. TPS #1 had massive fluctuations when in the closed position.
We tried to get it to the target but full adjustment it was still under voltage (0.45v) but would jump to 0.70v randomly. It seemed to open and close like normal but when returning to zero, the TPS voltage was different again (0.75v). So time to change out the TPS which meant removing the throttle body to make it easier. If you don't know, the TPS screws on a JDM throttle body can almost be impossible to undo.

I wanted to also kill two birds with one stone and that was related to the fast idle valve.

During the swap we dialled in the replacement TB and got it spot on knowing that it was a good TPS (in the video where my dad is adjusting the sensor itself whilst I monitored the voltage).

After the adjust it went back on the car and voila. Idle was steady again.

Now.... where can I order spare JDM throttle position sensors.... ??? Time to shop for future restorations...

#4g63 #galantvr4 #mitsubishigalantvr4