ADU-Engine wont idle properly (Misfires, dont run on all cylinders)

[vism]

Hi everyone

I have a problem with a ADU (RS2)Engine. The whole engine has been rebuilt, with custom JE-Pistons and new rods.

The problem is that when idle (900-2000RPM) it wont fire on all 5 cylinders (it sounds as it doesnt fire on all cyl. But maybe it does.... not comfirmed)

Doesnt sound good and is probably getting way to much fuel. Misfires alot. about -0.1 - 0 Bar vaacum on idle.

From 2000RPM and up however, everything is running fine, and it runs as it should.

The only fault i can see is from Vag-Com:

"00515 - Camshaft Position (Hall) Sensor (G40)
01-00 - Signal Shorted to Plus
00515 - Camshaft Position (Hall) Sensor (G40)
30-00 - Open or Short to Plus"


The hall sensor has been changed and checked. Also, the timing has been checked multiple times and looks correct.. The head is from a 3B engine with a new hall sensor fitted in front. This also looks correctly placed compared to a ABY head.

Any ideas? All suggestions welcome..

[andyg plym]

you say rebuilt? does that include ALL coilpacks? i know even a worn coilpack will still idle fine and will show up under load, but you never know

[andyg plym]

whoops!!! misread!! after 2000rpm its all fine? problem at idle?

[vism]

Yep, thats correct. The strange part is that the problem never occours over 2000RPM, if the coil pack is the problem, wouldnt it be the other way round? (Fail on higher RPM?)

[andyg plym]

Yep, thats correct. The strange part is that the problem never occours over 2000RPM, if the coil pack is the problem, wouldnt it be the other way round? (Fail on higher RPM?)

yes you are right.....had the same thing myself recently

[denniselbows]

is the throttle position sensor positioned correctly? i had problems with that which cause similare symptoms as you discribe i would thought it would bring up a fault code though.clear the fault codes and recheck to see if anything else comes up

[WabTheKing]

agree with above sounds like tps isnt set right

[UrS4boy]

I have a problem with a ADU (RS2)Engine. The whole engine has been rebuilt, with custom JE-Pistons and new rods.

The head is from a 3B engine with a new hall sensor fitted in front. This also looks correctly placed compared to a ABY head.

I'm confused. Just what is it about this engine that makes it an RS2 ADU? The crank bearings?

[Bram]

Are you sure you have set the cam timing correctly? If I remember correctly the HALL sensor reads the signal until a certain RPM and above that it does not use the signal anymore from the HALL. But I am not 100% sure, so if somebody can verify this?

[madpugger]

I think it is after 4000 rpm and only on WOT that it stops using the hall.

[oleab]

I'm confused. Just what is it about this engine that makes it an RS2 ADU? The crank bearings?

It is the motronic ECU, the injectors, the cams, the maf...
Just a modified ADU with other words.

[vism]

I'm confused. Just what is it about this engine that makes it an RS2 ADU? The crank bearings?

Block, wiring, turbo, intake, manifold? It is a ADU-engine with a 3B head, SCAT rods and JE-pistons.