Author Topic: Running issues with 65mm pulley  (Read 6101 times)

Offline Alexis

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Running issues with 65mm pulley
« on: July 05, 2014, 02:31:29 pm »
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.


« Last Edit: July 05, 2014, 10:59:07 pm by Alexis »

Offline C0UP3

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Re: Running issues with 65mm pulley
« Reply #1 on: July 05, 2014, 03:17:24 pm »
Sounds like it might be hall sender tbh

Offline Alexis

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Re: Running issues with 65mm pulley
« Reply #2 on: July 06, 2014, 06:14:21 pm »
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.

Offline Alexiskayak_7

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Re: Running issues with 65mm pulley
« Reply #3 on: July 06, 2014, 06:33:51 pm »
Sounds like an alternator issue. Check your battery voltage

Offline Andy

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Re: Running issues with 65mm pulley
« Reply #4 on: July 06, 2014, 07:43:25 pm »
Hall sender I reckon, a spazzy rev counter is usually a sign that it's failing.

Offline Alexis

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Re: Running issues with 65mm pulley
« Reply #5 on: July 06, 2014, 07:45:56 pm »
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.

Offline C0UP3

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Re: Running issues with 65mm pulley
« Reply #6 on: July 06, 2014, 08:13:35 pm »
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?

Offline Alexis

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Re: Running issues with 65mm pulley
« Reply #7 on: July 10, 2014, 05:32:44 pm »
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...

Offline Alexis

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Re: Running issues with 65mm pulley
« Reply #8 on: July 10, 2014, 07:38:59 pm »
Looks like I got the wrong type  :(



Offline Alexiskayak_7

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Re: Running issues with 65mm pulley
« Reply #9 on: July 10, 2014, 08:20:11 pm »
Thats from an early 6n/ibiza mk2 hall sender

Offline Alexis

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Re: Running issues with 65mm pulley
« Reply #10 on: July 10, 2014, 09:57:33 pm »
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.

Offline PeteG40

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Re: Running issues with 65mm pulley
« Reply #11 on: July 10, 2014, 10:39:32 pm »
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?

Offline olethalb

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Re: Running issues with 65mm pulley
« Reply #12 on: July 10, 2014, 11:00:58 pm »
Sounds similar to my issues

Offline Alexis

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Re: Running issues with 65mm pulley
« Reply #13 on: July 10, 2014, 11:10:49 pm »
I think it's 0237521050.

Offline PeteG40

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Re: Running issues with 65mm pulley
« Reply #14 on: July 10, 2014, 11:24:10 pm »
it got a vw part no - not a bosch.