Running issues with 65mm pulley

[Alexis]

These issues came about since fitting the 65mm pulley. Originally I didn't have the g40001 chip in and figured that was why these issues existed, however I've installed the new chip and the problems persist.

If you start it, then rev it to get rid of the battery light, let it settle back down to idle again, it sits at ~900rpm, then takes about a minute to die. I noticed after the first time it died, the rev counter kept jumping about bizarrely when the engine was off.

If you give it some gas and keep your foot in the same position, it will rev to 2000, die back to 900, back up to 3000 then die again.

Recently, it's had the supercharger serviced by myself,
new dizzy cap and rotor arm, as the last one was pitted,
New blue temp sensor a few months back,
Changed the co pot.

I've checked for vacuum and boost leaks, which seem to be nonexistant.

I'm sure I will have missed stuff out. Thanks for any help.

[C0UP3]

Sounds like it might be hall sender tbh

[Alexis]

Forgot to mention, if you unplug the blue temperature sensor to get it in service mode, the symptoms disappear.

I've been trying to get vwtool to read it, but I'm getting a connection error. I'm going to open up the cable tonight and test it.

[Alexiskayak_7]

Sounds like an alternator issue. Check your battery voltage

[Andy]

Hall sender I reckon, a spazzy rev counter is usually a sign that it's failing.

[Alexis]

Will do tomorrow. I hope its not as it just got replaced last year.

I was back at it tonight and realised the symptoms only appear after about a minute of idle. Before that, it will idle stable and at ~900rpm.

After the symptoms started, I unplugged the lambda sensor and the problems went away, and the idle increased to ~1100. I'm not sure if this means the lambda is faulty, or if the default rich map is covering up the real issue.

[C0UP3]

Default rich map covering issues I would assume. Do u revs change when unplugging blue temp sensor. As above what's ur voltage across battery when running?

[Alexis]

Last night it wouldn't start, just kept turning over but the fuel pump wouldn't even prime. I took out the fuel pump relay and cleaned the contacts, then put it back in, and now the problems solved. I'm assuming this was just a coincidence.

Once running, I checked the voltage and got 13.86v on idle then 14.06v throughout the rest of the rev range.

I bought a hall sender and it's just arrived, so away to fit it...

[Alexis]

Looks like I got the wrong type 

[Alexiskayak_7]

Thats from an early 6n/ibiza mk2 hall sender

[Alexis]

Damn. It was even listed as correct for the G40 here:
http://www.ignitioncarparts.co.uk/PartDetails.aspx?s_pc=PPU2733&s_vid=

My own fault for not checking though.

[PeteG40]

hmm i seen g40s with top n bottom sensor.  more with 4 screw holes and bottom sensor.

its the dizzy that looks potentially wrong - whats the part number?

[olethalb]

Sounds similar to my issues

[Alexis]

I think it's 0237521050.

[PeteG40]

it got a vw part no - not a bosch.