hopefully someone can help me out new to the evo scene and got myself a evo 4 with evo 6 tommi engine init.
when revving above 4-5k revs it seems to come back down to under 1k and almost stalls. but its fine under 4k revs? anyone know what this cold be?


also temp guage seems to be jumping around?


and help would be much appreciated.

 

Your idle needs to be set. If you have evoscan and a tactrix cable you can do this with the biss screw quite easily. If you don't your next best bet is go out into an area where no one will bother you for idling for about half an hour. I just go onto old country roads. Idle for ten minutes with everything that draws power off (lights, air con, etc.). After those ten minutes idle with everything on, crank the fan, highbeams on, rear window defroster on, etc. Do this for ten minutes as well and then go for a drive. Yor car might naturally idle a little bit higher now but it shouldn't drop low in revs or almost stall.

In regards to your temp gauge check your coolant and your oil and make sure they haven't mixed (blown headgasket). Check your thermostat as well to make sure it's not getting stuck. If you have evoscan with a tactrix cable you can log your coolant temp, if it stays at 90 celsius on evoscan but the gauge is moving around then it's an electrical issue somewhere along the line.

 

Av done what u said and seemed to cure it tbh. But seems to come bk now and again its not 100% if that makes sence haha.
Iv took thermostat off and it pushes down easy but under hot water it doesnt move so am running with no thermostat atm and she seems alot colder and better. Gunna buy a new cool running one.
Thank u buddy much appreciated.

 

It'll take the ecu a while to get it perfect but at least it isn't stalling anymore.