Rb20 Proplem Please Help

[Tommyd32gtst]

Having some trouble with my 1990 r32 gtst Sometimes when I drive it won't rev over 2000 rpm it revs to 2000 and then drops to 1500 and bounces between that at wide open throttle like a rev limiter if I take off in a higher gear then force it into lower gear n get the revs over 2000 rpm then it's fine to drive until it drops back under 2 grand, have tried a couple air flow meters and swapped ecu's any help is appreciated, thinking maybe TPS or cas

[markdem]

try setting your fuel pump to full pressure all the time. i had a problematic dropping resistor in my stag that wasnt letting enough fuel through, hence the stalling when more air is introduced.

i think on 32's its the silver aluminium box thats bolted to the left hand strutt tower. try simply disconnecting the plug

[DVS JEZ]

Try a new air flow meter

[Bsa]

Where are you located? It may be the plug going to your afm loose wire or pin or bad connection some where have you had it looked over

[Tommyd32gtst]

Down in tassie. It doesnt stall when more air is introduced it cuts the revs like an ignition fault not fuel but I will try the fuel pressure thing. Have had a look at wiring e.g wiggle test and terminal tension when fault occurs, have tried known good afm, I think it's more sensor related, it happens after you drive it get it hot turn the car off for a while and then re-start it like a sensor getting hot and

Playing up

[Tommyd32gtst]

Down in tassie. It doesnt stall when more air is introduced it cuts the revs like an ignition fault not fuel but I will try the fuel pressure thing. Have had a look at wiring e.g wiggle test and terminal tension when fault occurs, have tried known good afm, I think it's more sensor related, it happens after you drive it get it hot turn the car off for a while and then re-start it like a sensor getting hot and

Playing up

[GTSBoy]

It does sound more like the faulty AFM limp mode than anything else.

[Bsa]

Clean the plug with contact cleaner the blow all the shit out if you have tried a few afm and same problem it has to be bad conection

[Tommyd32gtst]

That's if its a afm related problem

[Truffles]

That's if its a afm related problem

Well you might as well see if that's the problem first. It does sound like your AFM is in limp mode.

[Tommyd32gtst]

Will thoroughly check afm wiring and get back.

[toffy]

It could also be a split/corroded cooler pipe/joiner

[Tommyd32gtst]

So it looks like the problem is after fitting a r33 turbo things are a bit hotter around the left hand side strut tower, this has caused the insulation to melt off the loom, I pulled the rest of the isolation and inspected all the wiring no faults, the problem is when the loom get really hot it gets a high resistance in the wiring I believe (getting very hot) so re insulated and relocated wiring loom and also applied some heat shield seems to be all good!

[markdem]

well done on the find bro. and thanks for the update