RB 20 Virus Help

[R31Heaven]

Ok its not a Virus but it is plauging a lot of owners here in Aus and yes I know it should be in the Maintanace post but so far no one has been able to come to any conclusion why its happening and it has been happening for a couple of years. Any way here we go. There have been numerous posts of people having the type of cold start problem where there car starts fine in cold start mode then all of a sudden retards the motor until it reaches a set temprature and then is fine, they all state that they have changed all there main sensors ie/: ecu temp, o2, also checked and swapped AFM. so my plea is that someone in Japan knows a Mechanic that can say yep know that problem, it is --------- any way any help would be a god send .

[Ronin]

Its supposed to do that. The computer is protecting the engine by richening it up and retarding the timing when its cold. Why would you want to stop it doing that. You shouldnt be booting it when its cold anyway.

[R31Heaven]

Ok probably not explaining to well. OK hop in car start it, runs fine let oil pump up, drive off still fine a minute into driving car retards (like putting you foot slighly on the break) coughs splutters a little start to run fine in this retarded state this all happens while cruising, no power here just soft gentle 2500rpm cruising. I have had an RB30 it never ever done this, ran beautiful/same cold and hot. the magic of EFI. I wont go into it here all I am asking if someone could talk to someone in Japan who may have come across this or have the knowlege on these engines.

[46n2]

no power here just soft gentle 25000rpm cruising

:D

Sorry I had to pick up o that typo classic...

Sorry can't offer any help in the thread as I haven't had it happen to me.

46n2

[The Dan]

I have that same problem.

it feels similar to a hesitation....the reason for it is the SMART omputer in the skyline which detects lean rich mixtures. You have to wait until the vehicle is almost at running temperature before the O2 sensor can send correct data to the computer ie. the O2 sensor has to effectively warm up in a way.

the reason your RB30 didn't do this is because it ran a slightly different computer.

There are two sollutions:

you could stand there with a lighter and heat it up.....ahaha

or you could just let the car warm up before you take off...now that would be a good idea.