Ive been told that if i leave the battery off my 98 wrx sti 4 it will reset the ecu back to standard ?
is this true or bull ????
cheers in advance

 

true

 

will that make it better or worse ?
and what will it do ?

 

all it does is reset the ECU so it re reads it parameters from the various sensors, dont expect it to do much...

Why do you want to do it..??


Dan

 

i didnt want to do it especilay but i belive if the car had been run on normal ul fuel (95 ron) it would have reduced the boost pressure so as not to damage the engine
and that if it was reset it would be back higher pressure again
dont know if this if right
cheers
paul

 

AHHH SAAB eat your heart out!!!!

if only scoobs had apc!! no more poxy ron worrys

Saab actaually promote how good it is advising you to run on leaded / lrp for a performance boot!!!

cos the apc adjusts the engine to whatever grade of petrol it detects

mart

 

oh rub some salt in why dont u lol !!!

 

The scoob does that too.. just takes longer to adjust positive than negative especially in the <98 cars but then the SAAB is probably very similar.

I believe you can reset by disconnecting battery but I always use the bizarre reset procedure..

Locate under the steering column above the clutch pedal the four plugs that connect together, two black and two green.. connect them.. remove immobiliser, turn on ignition (but not start engine) press accelerator to floor, lift to half throttlish and hold for about 10seconds.. lift off.. start engine and drive off boost until check engine light flashes.. pull over and turn off, disconnect plugs all done.

The plugs are sometimes taped to the loom with blue tape, they are near the larger yellow select monitor plug.

JGM

PS: At least you don't need a flat cap to drive it

 

PS: Don't think LRP is good to use in a car designed for Unleaded but not sure why.. cats for a start not that
I have any now but I think there are other issues too..

 

nice 1
does it make much difference m8 ?

 

I have an older car and reset the ecu fairly often.. just solved some knock I was getting strangely.. I don;t tend to get performance gain on mine really.. I just like to reset it to put all the fuel value back to base etc..

but the newer ecu like yours if suppose to learn fairly quickly so there should be no gain in doing so. But I have never had a newer ecu'd car and tried it.. maybe someone else can give their view on that.

I have the plugs wired to switches to save me fumbling under the dash..

JGM

 

ok thanks m8 ;-)