MartinW

Hi all, I've got a spare ecu allegedly from an RB5, which runs fine in my 2000 classic/ GC8 wagon, and with *plenty* more midrange punch.
However it won't idle properly, revs sit at 1200 or so whether warm or cold, and it hunts slightly ie up to 1300/ down to 1100.

This looks like an air leak problem to me, are there any major differences with the RB5 induction or idle-air setup that might cause this?

The car is bog standard 2000MY, nothing changed (at the moment...)

Martin

MartinW

and I've only been a member for 6 years, lurker or what?!

Jolly Green Monster

iTrader: (4)

have you tried resetting the ecu?

look in Help pages on my website Jolly Green Monster - ECU Mapping on how to reset it.

I don't believe there to be a difference that would effect idle.

If you refit the standard ecu does it idle fine?

Simon

MartinW

yes all works fine if I go back to the std ecu. I assumed resetting wouldn't do much since the RB5 ecu has been on my garage shelf for 6 months!

I'll give it a try and report back...

thx
martin

Jolly Green Monster

iTrader: (4)

if the original ecu was fine.. you fit the rb5 one and it is playing up it could be that the original ecu learned to a failing maf for example.. the rb5 ecu is then fitted and in a reset state..

if you refit the original now and it runs fine then something else is occurring

Simon

MartinW

other possibility is fuel pressure - was RB5 any different to standard?

Jolly Green Monster

iTrader: (4)

nope same.