Need Help Got Some Questions About My Rb20det

[dmac_25]

Hi,

Got a few problems with my RB20det 1st off i did my head gasket in it about 2 months ago so i put my spare 20 out of a wreck i brought had that engine in the car for a week and blew a turbo return water line and put a hole in piston 6.

So i was forced to put a new head gasket a Tomei 1.2mm with some hylomar on it and i put a hypergear tr43 turbo on it. I also wired in a z32 afm plug and still have the standard rb20 afm plug on it as well.

My problem is that the car runs but it idles at about 2000rpm and when it revs above that it cuts out at about 3-3500rpm.

My quick diagnostic is that the 2nd afm plugs are causing the computer to read the afm wrong, or that the computer is still in limp mode after the engine failure of the last engine or with all the plugs being disconnected that one or 2 havent got good connections.

Any ideas or thought about this issue that might help would be great full.

Also ive got a standard comp with a remap.

Cheers David

[bubba]

Was it remapped AFTER you changed afm's?

Edited February 12, 2008 by bubba

[dmac_25]

Was it remapped AFTER you changed afm's?

Hi mate,

I didnt change the afm just wired in the z32 plug into the loom still running the r32 afm.

It shouldnt cause a problem having the 2 plugs in the loom but im not sure now.

Cheers

[hypergear]

Too much boost and hitting Boost cut? have the AFM maxed out? or maybe faulty AFM? are you running ext WG?

[dmac_25]

Too much boost and hitting Boost cut? have the AFM maxed out? or maybe faulty AFM? are you running ext WG?

Hi Stao,

Not running ext wastegate just the standard internal one not running a boost controller just what the standard 10psi ive got a spare arm will change it to see if thats the prob it was working fine a month ago tho.

Cheers

[dmac_25]

Has any1 got any more ideas on this issue.

Cheers David

[abu]

Hey man, have you checked the timing?

And are you still running stock injectors?

Edited February 13, 2008 by abu

[1400r]

remove z32 wiring and start the car again

technically undo what you did that caused the problem

[vinnie32GTS4]

sounds like ur ecu is running in R&R or limp mode

[GTScotT]

hmm mine would idle at 1700 and cut at 3g as well, went i had a broken wire going to the afm

maybee u broke one of the wires when putting the 2nd plug on

Edited February 14, 2008 by GTScotT

[dmac_25]

Thanks guys your given me a great help will check what you have all said im thinking it is the afm wiring more everyday.

Cheers David

[mjfawke]

Check the computer for error codes.

Idling at 2K is a symptom of the idle switch in the throttle body not working. The 3.5K cut is due to limp home mode, probably AFM.

[dmac_25]

Thanks Guy,

Found the problem the ecu didnt like the Z32 afm plug and the R32 plug.

Cheers for all the help