4AGE dies under 3000 rpm

[grey_nomad]

Having problems with JDM 4AGE big port in AE86. Engine and ECU are from AA163 Celica as far as I know. Has been running fine since I fitted it back in 2005. Used as daily drive and track car.

It has suddenly started spluttering when getting back on the throttle after lifting off, like when going through a round-about.

Then it's impossible to get it off the line at less than 3000 rpm. Have to bring the revs up slowly or it dies.

Fuel delivery is from Facet pump outside tank, VL pump in engine bay, both new.

Code from ECU is 9, speed sensor - but this has always been there - no other codes.

Any suggestions?

[grey_nomad]

I should add that it only happens once the engine is fully warmed after a 20km drive.

[Grega]

sounds like your temp sensor might be suspect - check the wiring to it - if its telling the engine its cold (after its warmed up) it might be running overly rich - especially seeing as its happening when the car is warmed up

[grey_nomad]

sounds like your temp sensor might be suspect - check the wiring to it - if its telling the engine its cold (after its warmed up) it might be running overly rich - especially seeing as its happening when the car is warmed up

Temp sensor OK cold and hot when checking at ECU.

Looks to be a TPS problem. Voltage at ECU and TPS terminals has intermitent blips instead of smooth change. Checking resistance of at TPS terminals confirms intermitent open circuit at more than 1 point.

Would that cause the problem?

Where is best place to get new TPS. I'm in Ballarat Vic.

Engine is a JDM 4AGE
TPS Toyota Part No: 89452-20060

[Grega]

old age mate ; variable resistor type TPS is probably worn / dirty / just plain old
i'd try toyota or even bursons would have something more than likely

[beerhead]

Is the TVIS still working once it gets hot?