Chat Purchased an A2 1.6 Petrol FSI it's gone wrong on the Fuel System and I'm looking to identify part N276

PhilipS

New Member
@Andy Thanks for this. I would assume the mechanic has worked on every type of Audi he even drives a huge Audi himself a really old one think its a 90s S8. He is an old guy and he told me that in the 1970s and 80s Audi were spending a lot of money on developing new technology and that he got some type of master qualification from them and been to Germany. He's fixed every car I have ever had since 2009 which is BMWs Fords a Triumph Stag. Also its a really big garage and he owns it. This is the first Audi I've had and even though it's not a really super fast one which is what I would like I am in liking it. It's a fun little car and my wife and daughter love it and right now it's keeping my driving license clean. I need to keep my distance from the RS7 0-60 3.2 secs otherwise that's just exactly how fast I'll be driving!
Yes if that HPFP is easy to get at that would help. Only thing that is a bit shocking is I'm guessing you guys have seen the price of a new HPFP for a Audi A2 right? That makes it a good time to own an A2 now because the parts are still available second hand
Regards
Phil
 

PlasticMac

Member
@Andy Thanks for this. I would assume the mechanic has worked on every type of Audi he even drives a huge Audi himself a really old one think its a 90s S8. He is an old guy and he told me that in the 1970s and 80s Audi were spending a lot of money on developing new technology and that he got some type of master qualification from them and been to Germany. He's fixed every car I have ever had since 2009 which is BMWs Fords a Triumph Stag. Also its a really big garage and he owns it. This is the first Audi I've had and even though it's not a really super fast one which is what I would like I am in liking it. It's a fun little car and my wife and daughter love it and right now it's keeping my driving license clean. I need to keep my distance from the RS7 0-60 3.2 secs otherwise that's just exactly how fast I'll be driving!
Yes if that HPFP is easy to get at that would help. Only thing that is a bit shocking is I'm guessing you guys have seen the price of a new HPFP for a Audi A2 right? That makes it a good time to own an A2 now because the parts are still available second hand
Regards
Phil
Does your mechanic have a fully licensed copy of VCDS, and if so, could he show/give you a set of VCDS diag reports that confirm the HPFP is not delivering the required pressure?
Mac.
 

Andrew

A2OC Donor
Does your mechanic have a fully licensed copy of VCDS, and if so, could he show/give you a set of VCDS diag reports that confirm the HPFP is not delivering the required pressure?
Mac.
Hi Mac,

It is VCDS, post number 9.

@PhilipS, your description of the mechanic does inspire confidence, but would still ask the question.

Andy
 

PlasticMac

Member
I'm thinking back a few months, when a poorly sealing filler cap (on an FSI) caused problems, and we investigated the way the fuel rank was vented. Turned out that the system is a closed circuit. Not sure we got to the bottom of it, but that carbon cannister was periodically purged via the inlet vacum. There was a solenoid valve that controlled that purge. My thinking is that a blocked cannister, or duff solenoid, could block the tank vent, and restrict fuel supply to the HPFP. This convoluted thought was triggered by mention of the cannister.
Blame it on the weather 😎☺️
Mac.
 

Andrew

A2OC Donor
I think the actual line pressure can be measured ...
If so, worth doing?
Mac.
Yes and yes, that's why I referred to measuring blocks in post 20, looks like block 140.

I remember the correct procedure before opening up the fuel rail for work is to reduce the pressure, saves high pressure petrol squirting everywhere. You do this by pulling the fuse on the electric fuel pump, run the engine at idle and monitor the pressure until it reduces from 70 bar to 6 bar, takes two or three minutes apparently. I wonder how many bother?

Andy
 

PhilipS

New Member
Thanks for all your writings here. The mechanic gave me the first copy of the VDCS which was a very long document 7-8 pages. That was just after he repaired the fuel sensor and prior to that another mechanic I don't know had replaced one of the injectors on Cylinder 4 with a second hand injector. Since then i.e. 50 miles later I had the bunny hoping incident in 1st 2nd third gears. Where the car was going up and down in gear under load between 4000 and 1000 revs without me moving my foot position on the accelerator. So I got the car towed back to the good mechanic last week. He must have done another VDCS he said there were new faults. I haven't seen the mechanic since then. I haven't seen the latest VDCS. The mechanic took time out to talk to me on the phone twice. He said it was Audi part code N276 but it could be a number of parts causing the fault.
I'm going to take in all the parts the HPFP the valves I listed in an earlier post that you guys suggested I get I got them quiet cheap on e-bay and just let the mechanic try to fix it with those parts.
Questions I have are Andy said the HPFP pump is easy to get at and that you don't have to take off the manifold to replace that. Is that true please? Also does the HPFP run off the cam please and is their a Cam bucket? The mechanic said the part coming up or parts coming up were Audi code N276 and he would need to take off the Manifold to replace the £440 N276 Valve but the valve you guys talked about is connected to the HPFP isn't it or maybe it isn't on this car as the HPFP is a different shape to the VW ones? I'm sure all will be revealed when the mechanic gets hold of the parts and I get the latest copies of the VDCS diagnostics. I with of course share this with you. Rgs Phil
 

steaman

Member
Se my post #42 in this thread:
 
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PlasticMac

Member
Se my post #42vin this thread:
That fuel system schematic is very helpful.
Mac.
 

PhilipS

New Member
@steaman and @PlasticMac yes I've read through this string already thanks it is very helpful. I guess though for the non mechanic like me with no experience of working on the car I just did not know what the parts looked like. I'm better on that now though thanks to you guys. I see whats in the schematic and you've helped me get what are likely to be the right parts.
I'm just waiting for the final parts to arrive now. Then the mechanic will do his thing. This could be that he just bolts on the parts associated with the N276 Audi code or more likely he just examines the parts I have and bolts everything on that looks good giving me all the old parts back unless they are obviously broken. Then he does another VCDS gives me the before and after VCDS and tells me the car works and I drive off in it. There is a chance the car won't work the mechanic has always been amazing in this situation and he will then investigate everything using past experience. @steaman the mechanic did not mention anything about the petrol tank and associated bits. The only time this conversation has occurred so far was that the previous owner who had the car a year or so used standard unleaded rather than high Octane fuel. Out of the mechanics I've talked to they all told me don't add Redex to the fuel and that dirt in the fuel take from the wrong petrol etc dirty petrol varnish etc won't get into the engine after replacing the fuel filter. The good mechanic did not mention any of this yet but you have a great point as of course it could be something to do with the fuel tank and the N276 code and other fault codes were due to the HPFP being fuel starved. Fuel starvation of some type must have caused the bunny hopping in first and second gears like you are running out of fuel then its back all in the space of 1 second then it happens again. The only thing the good mechanic said on this was it was the car being switched to limp home mode then back to normal mode then limp home and so on and if I'd switched the car off for a few minutes the ECU would have re set. I thought I did do this and it did not work but did I wait long enough. If this is true and no amount of off time resets the ECU maybe then its the fuel tank and not the HPFP and associated valves?
Its all down to the VCDS I will try to get the mechanic to give me a HPFP data. There must be different error codes on a system like VCDS for fuel tank verses HPFP and the high pressure fuel system. Anyway fingers crossed I'll let you know the results with VCDS codes versions of the software you name it
 

steaman

Member
If you measure the pressure on the high-pressure side ( Block 140) with VCDS while driving and it is always within the limits, then you also know that the low-pressure part, the lifting pump, the filter and the regulator also work ok.
 

PlasticMac

Member
If you measure the pressure on the high-pressure side ( Block 140) with VCDS while driving and it is always within the limits, then you also know that the low-pressure part, the lifting pump, the filter and the regulator also work ok.
Best have a co-pilot for this!
Mac.
 

PhilipS

New Member
When I took the parts into my good mechanic he said he had talked to experts about the N276 part code that does not relate to just one part. The experts said to do the job right you've got to get the fuel pump regulator sender from the low pressure side in the fuel tank as that is part of the N276 part code. I've now purchased that pump and it looks like there is a sender on it for £39 with fast delivery for e bay. So the previous owner - owners running this car on standard unleaded might have gunked everything up on the tank side as well. My mechanic is very pleased I've got the HPFP though he said he will use that.
Do you think this sounds normal I see there is a comment about the fuel tank from @steaman ?
 

steaman

Member
When I took the parts into my good mechanic he said he had talked to experts about the N276 part code that does not relate to just one part. The experts said to do the job right you've got to get the fuel pump regulator sender from the low pressure side in the fuel tank as that is part of the N276 part code. I've now purchased that pump and it looks like there is a sender on it for £39 with fast delivery for e bay. So the previous owner - owners running this car on standard unleaded might have gunked everything up on the tank side as well. My mechanic is very pleased I've got the HPFP though he said he will use that.
Do you think this sounds normal I see there is a comment about the fuel tank from @steaman ?
The N276 is one entity that only control the high pressure. If you read page 35 in the attached document you will find that the N276 only regulates the fuel high pressure in the intake manifold.
 

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PhilipS

New Member
The N276 is one entity that only control the high pressure. If you read page 35 in the attached document you will find that the N276 only regulates the fuel high pressure in the intake manifold.
@steaman thanks for this. This is the best document I've seen so far. I wish I had this on day one of having this problem but I had not joined at that stage. What about posting this up in a type of library on this group. This shows the actual picture of the N276 part which is what you guys told me to buy in the first place which I did buy. I paid £79 for a used one e bay. The mechanic said if it was available from Audi which it isn't it would be £440 new SO £79 was in the right price range for a used one. The mechanic has this N279 fuel pressure regulator valve in a box I dropped with him with the HPFP, this and a couple of other items for the fuel system as I say he already fixed the sensor. I guess I'll just have to drop the mechanic off the sender and pump for the petrol tank as well and get him to start this job
 
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