EJ25 confusing power issues

[fredsub]

Have you tried replacing the ECU ? This sort of problem where it runs properly, then it doesn't.....I can well imagine the ECU having some sort of marginal thermal problem,glitch etc. For all that $ your spending chasing this you could have got a new aftermarket ECU...........

[madmat]

your right Fredsub but i have swapped it with the spare unit i have and it made no different. the only thing for sure is when i find the problem it will be stupid and put mud on my face

[madmat]

OK i fixed it at last:D

the problem came down to the jap import motor has different exhaust cams and these cams have to stay with the block.

When i put the new heads on as per good practice i keep the moving parts together IE the cams stayed with the heads. i don't know exactly where but the relationship between the crank and the Cams is different between jap and Oz engines so when i mixed the two up i created a problem.

Why did resetting the ECU fix the problem? this was because when the ECU was reset it was in an adaptive learning mode. while in this mode it uses base settings to run once it has learnt it then starts to control things. Apparently the injector and ignition timing is determined by both the cam and crank sensor. (this differs from the advice on this forum) once the ECU was controlling things it had a difference between cam and crank that it couldn't reconcile hence my problem.

We picked up the issue by driving with the scanner connected and whenever it was low on power the timing was at 0 degrees advanced. this made us think about the whole timing side of things.

What have i learnt form this?
No matter how fast you have to get the car back on the road NEVER EVER;) use a Jap import motor. It WILL NOT save money. i put a jap motor in when i had little money and time and thought she'll be right. it was never a good motor even before the heads went.

Also Jap imports say 40000ks this is crap the wear on the motor is way beyond 40000ks.

so i hereby add myself to the list of people burnt by the Jap import motor business.

The bloke that sorted this out was Gerry Marson who owns Mobile Auto Diagnostics. Sydney based 0403 147 717

[Matatak]

Finally

we actually had a lancer in today which was set to 0 degrees timing also..


ran like a sack of shit until we fixed it up.

[Alex]

Finally

we actually had a lancer in today which was set to 0 degrees timing also..


ran like a sack of shit until we fixed it up.

dont they all run like a sack of shit?

alex

[FROG]

happy to hear that mat

[foxx510]

Great to hear you solved it.