FSI Hesitation - Finally got VCDS

Hi folks...
Going back to the original question, I have a 1.6fsi that runs like a lump of the proverbial, with slight throttle it clears the misfire, under general low pressure driving she is ok, but as soon as you put your foot down slightly she misfires like crazy. The only fault code showing is P1020....
To date the local garage have changed the flap actuator, the fuel pressure sensor and had the flaps cleaned...but it still plays up
Please, any help would be appreciated as it is doing my head in now!
Thanks Clackers
 
Is it a misfire or is it more of a hesitation?
If you have access to VCDS you can log the fuel high pressure during driving. I found the High Pressure at Block 140 and it is regulated to between 50 and 100 BAR. Should be 60 Bar at 750 rpm.
If the high pressure is ok you probably have an error at one cylinder, ignition or injector.
 
Is it a misfire or is it more of a hesitation?
If you have access to VCDS you can log the fuel high pressure during driving. I found the High Pressure at Block 140 and it is regulated to between 50 and 100 BAR. Should be 60 Bar at 750 rpm.
If the high pressure is ok you probably have an error at one cylinder, ignition or injector.
Is that what P1020 means then? That's the only error code showing...
 
That error code P1020 is not very specific It could be lack of fuel on one cylinder or high fuel pressure out of range (starvation on all cylinders). This is a way to identify direction.
As you probably already learned, the 1.6 have many sensors, valves and other stuff that can be the root cause to your problem.
Or you can continue replacing components by random.
 
As far as I am aware it said excessive fuel P1020, so would that mean that there is a problem along the fuel line etc?
I love the Fsi in fairness, but these little niggles (or a big niggle in this case) is testing my patience a little!!!
 
With regards to the random replacement of parts, these have been replaced due to the error codes showing (actuator was snapped), N136 code made me change the vacuum actuator valve, but this P1020 seems to be a nightmare, as it doesn't direct me to an actual problem....I just want it to run right again!
 
The random replacement is my own experience and not related to you personally. I have read all threads related to injection and ignition and it is very hard to pinpoint the root cause.

My recommendation is to identify if you have a common injection problem or if it relate to one cylinder only. That's why I suggest measuring the high pressure while driving. If the misfire correlate to fuel pressure dropping.
 
It appears to be all cylinders and not just one (from the message given), but unsure as to whether the garage have the ability to connect whilst doing a drive round. I didn't take the random replacement personally :)....this has often been my way of curing problematic cars in the past though!!!!
 
If you know (or at least assume) that it is a common error we can rule out injectors. Next step is to identify if it relates to low or high pressure.

injection 2.JPG
injection 3.JPG
 
My own experience, if you get repeated misfire on a specific cylinder and the coils have made no difference, then it's the injector. And at least a shift to replace it if you haven't done one before. I got mine for 90 quidsish from Parts In Motion on ebay. A quick swap and the misfire was banished forever.

The random misfire error I found was due to the multiple vacuum leaks. See my other thread where I went through it all, breather pipe on the back of the block is a prime suspect and can be inspected when you are pulling the inlet off to do the injector or from under the car. A Polo that won't rust :)
 
The replacement of the injectors is a bigger task compared to other injection components. That's why identifying of it is a common fault or not.
When I had the same error code I replaced the injectors and sent the old ones to testing, cleaning and testing again. But they were not faulty!

At the same time I also replaced the breather pipe on the back of the block but one of the connectors did not snap i position and came loose after a short time but gave a different error code. The pipe is accessible from underneath the engine.

G247 and N276 are also possible root cause candidates and the also require removal of the intake manifold. A faulty high pressure fuel pump can also give the same Error Code but is a expensive component to replace.
 
It’s grim how quickly the costs could escalate to repair these engines if you don’t spanner yourself. Nothing either of us have suggested is cheap to get a garage to do ☹️
 
Its amazing how the word expensive and Fsi go together like hand and glove!
G247 has been changed, so that's one of them out of the way, I may have to bite the bullet and try N276 next, building my way up to the fuel pump, unless anybody on here has any of these items at knock down price? Running out of hair to pull out now!!
 
Its amazing how the word expensive and Fsi go together like hand and glove!
G247 has been changed, so that's one of them out of the way, I may have to bite the bullet and try N276 next, building my way up to the fuel pump, unless anybody on here has any of these items at knock down price? Running out of hair to pull out now!!

To my knowledge you have to remove the upper part of the intake manifold to replace G247 and that is a big part of the work to replace injectors etc.
If a garage will do the job I strongly recommend you to replace all components hidden behind to manifold in one go.
 
Back
Top