I have changed the AE802 ecu in my MY00 to a AE801.
The car does seem much better and my MPG has gone up alot as well.
However, when cold I'm still getting a surging under light acceleration.

What could be the problem???

Thanks
Steve

 

They all do that - the PPP, AE800,801,802,Tek 1,2,3. I have not found a cure. But it is slight and goes away as soon as the coolant temp is normal.

 

They all do that sir...... *LOL*

Sorry John, couldn't resist

 

Ooooh, just had a thought (ouch)

The fuel pressure when cold is about 0.3 bar different from when hot. I measured it but can't remember which way it was. It was enough to knock out my settings anyway and I now record fuel pressure as a hot or cold setting.

Someone needs to fit an adjustable FPR and try tweeking it a bit either way I suggest.

Or perhaps you can change the cold enrichment value John ???


Andy

 

I’ve got an upgrade fuel pump in my car and the fuel presser is cold or hot the same but the car keeps downing it

Kurt

 

The cold enrichment parameters are not documented so far, and therefore not adjustable.

 

Maybe it's my FSE regulator that causes the pressure difference from hot to cold ?

Is it worth trying the car from cold with the Lamda sensor disconnected from the ECU ? Unlike when a lamda sensor is on the way out and giving wrong value, the ECU will recognise the failure and stay open loop fueling, referencing map values i assume.
This may prove if it is a closed loop fuel problem (which I suspect it is)

Andy