Tfsi power loss *important thread for other owners*

[viliusruzas]

Good day Audi fans,

it is almost a joke of how much work i have done and still standing at the starting point; This thread will be a good guide for all the TFSI ( VW, SKODA, AUDI etc) engine people who has same issue and dont know what the hell is happening.

I will try to be quick. My AUDI 2.0 TFSI 2006 147 KW QUATTRO losing power after driving it around or more than 3k RPM. Its not so bad on cold engine, but impossible to drive normally when it is HOT (working temp).
It happens in the highway (top speed 130Km/h as 3k rpm on 6th gear), it happens while driving up the hill, and it happens than i put too much throttle (especially on 3rd, 4th, 5th and 6th gear).
The fault code always was ,,High pressure fuel fail'' or something like that. If you delete that code, while driving with computer pluged in, the car regains the power immediately, and drives as it should be for several minutes until the code comes back again.

I have invested THOUSANDS of Euros (2500euro+) in repairs for this car and still experiencing the same problem. So far these jobs have been done. (Allparts original VAG):
1) New oil and oil filter;
2) New fuel filter;
3) New air filter;
4) New antifreeze;
5) New High Pressure Fuel Pump;
6) New Camshaft follower;
7) New Intake Camshaft and stretch bolts;
8) New Coils (only 2 of 4. Mechanic said other two alright);
9) New Spark plugs;
10 New Fuel injectors;
11) New engine belts;
12) New tensioners;
13) New water pump;
14) New camshaft chain;
15) new camshaft chain tensioner;

I dont know what to do. Seriously. Spent days surfing the NET for info, and have done loads of stuff as you see above. My buddy mechanic has been working with VAG cars for more than 10 years and he can not tell what is happening. Just the raw guesses.
Now the thing is we can hear a strange rattling sound when you accelerate a car from 2k rpm. The sound is annoying. And it comes from the area where the fuel injectors are placed. Somewhere around that place. I have uploaded a video so you can hear it yourself. Any ideas what is that?

>>>>>>> https://www.youtube.com/watch?v=NP8D...ature=youtu.be

So all in all, i am open to all thoughts and ideas as i am in the situation which takes my all hope to have a good running car..

Thanks everyone in advance. I hope with your help i will be able to find the hiding ,,king of the faults'',

[aluthman]

The rattle sounds like a chain rattle. Also, the exact code might be helpful. It sounds like you are going into limp mode for whatever reason. When I had this issue, it ended up being the lpfp and controller. Have you logged the low side fuel pressure when this loss of power is happening?

[viliusruzas]

The rattle sounds like a chain rattle. Also, the exact code might be helpful. It sounds like you are going into limp mode for whatever reason. When I had this issue, it ended up being the lpfp and controller. Have you logged the low side fuel pressure when this loss of power is happening?

I can't believe it is the chain. As I changed the old one with brand new + tensioner. No I haven't logged in low side fuel pressure. Do you think lpfp can make these terrible noises and making car go to limp?
Maybe it is worth to mention, but my car (before the repairs) was standing In garage without doing any miles for 2 years. it has only 60k mileage though.

[aluthman]

A bad lpfp or lpfp controller can most definitely cause the car to go into limp mode. That noise does sound metallic though. Where is it coming from? There is also a chain on the front part of the engine that drives the oil pump and balance shaft assembly.

[WewannaB7]

I know what the problem is! We don't have the TFSI engine...B7 is a FSI engine, so that must be the problem! Seriously though, I am no mechanic by any measure, but it sounds like a vacuum leak to me.

[vce1232000]

I know what the problem is! We don't have the TFSI engine...B7 is a FSI engine, so that must be the problem! Seriously though, I am no mechanic by any measure, but it sounds like a vacuum leak to me.

But we do have a TFSI motor. It stands for Turbo fuel stratified injection. Maybe your confusing with the TSI designation

Here's a link and look into B7 section powertrain youll see the designation https://en.wikipedia.org/wiki/Audi_A4

[viliusruzas]

A bad lpfp or lpfp controller can most definitely cause the car to go into limp mode. That noise does sound metallic though. Where is it coming from? There is also a chain on the front part of the engine that drives the oil pump and balance shaft assembly.

It sounds VERY metallic to be honest. Thats why i have changed the chain. I could bet that the chain was misfunctioning, but i was wrong. The old chain was like new when i took it off. It is so wieeeerd... And it does not make any sound then engine is idle. The sound is getting even louder when the gear is on.

[viliusruzas]

A bad lpfp or lpfp controller can most definitely cause the car to go into limp mode. That noise does sound metallic though. Where is it coming from? There is also a chain on the front part of the engine that drives the oil pump and balance shaft assembly.

That lpfp. Does it make any sound if malfunctioning? Is it a hard job to check this part? I Have never spotted anyone talking about lpfp probs in forums.the biggest troublemaker is that hpfp which is fitted new in my case..

[WewannaB7]

But we do have a TFSI motor. It stands for Turbo fuel stratified injection. Maybe your confusing with the TSI designation

Here's a link and look into B7 section powertrain youll see the designation https://en.wikipedia.org/wiki/Audi_A4

Correct, I was just messing. Technically, it is a TFSI. Our engine covers only say FSI vs the B8s which have the TFSI lettering.

[aluthman]

That lpfp. Does it make any sound if malfunctioning? Is it a hard job to check this part? I Have never spotted anyone talking about lpfp probs in forums.the biggest troublemaker is that hpfp which is fitted new in my case..

Not really, it just can't supply the fuel the car is asking for and then you go into limp mode. Your loss of power and rattling noise aren't necessarily the same issue.

[vce1232000]

That lpfp. Does it make any sound if malfunctioning? Is it a hard job to check this part? I Have never spotted anyone talking about lpfp probs in forums.the biggest troublemaker is that hpfp which is fitted new in my case..

There is a few threads addressing this issue. Aluthman is correct about a failing or failed lpfp throwing it into limp mode. Thats why when you clear the codes the power will come back momentarily until the fault code come back. You can run a vcds data log and see that the lpfp is out of specs underload. When the motor is cold more importantly with the lpfp is cold it will generate the proper psi until it gets under normal operating temperatures then it will fall under specs. usually a failing pump will whine somewhat. And performance will suffer when the tank is less then 1\4 full and normal operating temperature

[viliusruzas]

There is a few threads addressing this issue. Aluthman is correct about a failing or failed lpfp throwing it into limp mode. Thats why when you clear the codes the power will come back momentarily until the fault code come back. You can run a vcds data log and see that the lpfp is out of specs underload. When the motor is cold more importantly with the lpfp is cold it will generate the proper psi until it gets under normal operating temperatures then it will fall under specs. usually a failing pump will whine somewhat. And performance will suffer when the tank is less then 1\4 full and normal operating temperature

Thank you for your opinion. If I understand correctly, driving on full or half full tank, will ignore the lpfp problem as it will be able to get more fuel? (Especially driving up hill).
Any ideas about lpfp replacement job? Messy one I presume?

[viliusruzas]

P.s. does anybody know the oe code for lpfp, can't seem to find it on eBay by entering lpfp or full name.
Also I am reading threads about this thing, there are not many as I see.
Strange as it is.

[aluthman]

Thank you for your opinion. If I understand correctly, driving on full or half full tank, will ignore the lpfp problem as it will be able to get more fuel? (Especially driving up hill).
Any ideas about lpfp replacement job? Messy one I presume?

The more gas you have in the tank, the messier it will be. It's not a hard swap however.

P.s. does anybody know the oe code for lpfp, can't seem to find it on eBay by entering lpfp or full name.
Also I am reading threads about this thing, there are not many as I see.
Strange as it is.

LPFP for Quattro cars: 8E0919051CQ
LPFP for FWD cars: 8E0919051CN
LPFP controller: 4F0906093K

[viliusruzas]

The more gas you have in the tank, the messier it will be. It's not a hard swap however.



LPFP for Quattro cars: 8E0919051CQ
LPFP for FWD cars: 8E0919051CN
LPFP controller: 4F0906093K

Thank you. I am going to take a look. Damn i went so far now, there is no way back just to go forward. And end this ***t.

[viliusruzas]

The more gas you have in the tank, the messier it will be. It's not a hard swap however.



LPFP for Quattro cars: 8E0919051CQ
LPFP for FWD cars: 8E0919051CN
LPFP controller: 4F0906093K

I am thinking now again. Lets presume it is LPFP or controller. Why I am not getting the code about it? Just the Damn high pressure fuel pump code. Knowing they are original brand new Audi parts fittrd a week ago, makes things wierder than weird.

[aluthman]

You should try to get logs to see if this is actually your issue before spending money on parts. I would scan for codes at a minimum.

[aluthman]

I am thinking now again. Lets presume it is LPFP or controller. Why I am not getting the code about it? Just the Damn high pressure fuel pump code. Knowing they are original brand new Audi parts fittrd a week ago, makes things wierder than weird.

What is the code that it is throwing?
I was getting a P0089 or P310B code when mine was going out.

[ericpaulyoung]

Log blocks 1, 2, 230 and 231

[viliusruzas]

I can't remember the codes. Got my docs in the workshop. I am going for two days holiday as I am frustrated of all the things happening with this car. Just Insane.
I will definitely write them here on Monday. Maybe your eye will be sharp to spot something.
Thanks lads.

[ericpaulyoung]

Honestly sounds like your turbo is bad.

[vce1232000]

I am thinking now again. Lets presume it is LPFP or controller. Why I am not getting the code about it? Just the Damn high pressure fuel pump code. Knowing they are original brand new Audi parts fittrd a week ago, makes things wierder than weird.

To bad you didnt live over here. Ive got a almost new a4 LPFP controller along with a RS4 LPFP controller (Upgrade for us) that I would have sold you on the cheap

[vce1232000]

I am thinking now again. Lets presume it is LPFP or controller. Why I am not getting the code about it? Just the Damn high pressure fuel pump code. Knowing they are original brand new Audi parts fittrd a week ago, makes things wierder than weird.

Because the hpfp runs dry from lack of fuel and throws the car into limp mode before any other codes can be stored

[rongeur]

Honestly sounds like your turbo is bad.

Agreed, a chain woulf slap at all rpms and just accelerate. The screech comes just as the turbo should start spooling.

That is a lot of parts to replace - way more than I would expect given the description you supplied of your symptoms. Are you sure your timing is all correct too?