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3 Posts
Discussion Starter #1
Hi I’m new to the forum hoping to get a bit of advice.
My girlfriends A1 has intermittent issues with rough idle. Not always when cold, sometimes when hot and sometimes it runs perfectly for a few days. At junctions it will surge or be gutless so it’s not ideal.
When she last had it serviced they suggested it may be the injectors. But could not be sure. Obviously an expensive experiment if that’s not the cause.
No fault codes, no EML etc. It has got no worse.
I have been googling which has brought me here!
is it possible that a diesel purge could be of benefit in this situation? The car is on 88k miles now.
Its the CAYC engine I think.
if it is possible my understanding of the process is:
Pull fuse on fuel pump
take off the inlet hose and the outlet hose from the fuel rail
fit a temporary hose from the outlet which will go into the jar of Diesel Purge
fit a temporary hose with inline filter which will go from jar of DP to inlet of fuel rail
fill the jar will DP
run engine with varying revs and make sure DP dosent run out

I have not been able to find a video with the same 3 hoses from the fuel filter (see pic) as I have seen some people join 2 of the hoses together too.
Sorry this a bit long, I’m no expert but always willing to give things a go myself.
thanks in advance


Premium Member
9,720 Posts
First posts normally go in introductions else you could get a free fix and we never see you again!!!

Forum Rules and Guidelines

This is a new forum layout which is owned by a company last year that doesn't give a dam with loads of bugs which have been reported in the new thread. There is no TDI Wiki at the moment or original similes which they refuse to install. It doesn't show the car spec/location.

Add your car specs to your signature that will show on every post you make.

Car spec now shows not for all members.

Myturbodiesel moving on

Release Notes

We Are Live - Community Feedback

This has been talked about many times.

I've made a poll which no one has posted in, there are a few votes and comments.

Do you like the new forum features?

Wiki pages have been restored as of 7th December, I asked where is the link it should be on top of the main forum.

No error codes scanned with what?

You need to get your motor scanned (preferably with VAG-COM\VCDS) for any error codes logged in the ecu and post them, that will save a lot of guessing and check systems out.

You think is CAYC?

Data Sticker/Options Sticker and Engine Codes

Manufacturer: Audi, Date(s) Used: 05/2010-04/2015, Model: Audi A1, Engine Code: CAYC, 77Kw, 105PS, 1.6 Ltr, 4 Cyls, Remarks: Turbocharged Direct Injection Common Rail (TDI-CR) 16v Timing belt

3 Posts
Discussion Starter #3
Hi Keith,
I just added an intro post.

Im not sure what the garage where the service was done used to scan the car, it wasn’t an Audi main dealer. So maybe a generic scan tool.
I have used OBDeleven myself which showed no errors and the EML has never come up.

It is a CAYC, just checked again on the OBD11 app.

I think a diesel purge has got to be worth a try if it’s possible to do it on this car. I have read good feedback from people who have tried it.

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