1.4 petrol poor idle issues

[PlasticMac]

As @birtyA2 says, the two fuel rails are very different. The original, AUA rail has several more connections, for fuel return and vacuum, that are not present, on the later BBY rail, because it has no fuel return circuit.
Mac.

 

[Joga]

Do you mean this side .
It seems like this side does not have any valves fitted either ..

Yes that side.
I agree it seems not to have a clearly visible valve ( unless it is under the black plastic protrusion right of the metal clip).
Anyway this valve is not crucial although helpful if you need to purge air out.
By the way yours look just like this car so not really abnormal in this respect.
https://www.a2oc.net/community/index.php?threads/remove-injectors-1-4-petrol-bby.36815/

 

[Joga]

There seems to have been an interim version of the BBY, which has the BBY individual coil packs, but not the BBY non return fuel system. I formed this view from there being a fuel rail, with the return circuit, listed as being AUA and BBY compatible, and a version 2 of the crankshaft sensor, which is square, to fit the AUA housing, and is also listed as AUA and BBY compatible. There's a round crankshaft sensor too, but that is BBY only.
I guess Audi had a lot of AUA parts that they wanted to use up.
The relavance of all that to the @Azim car, is that by fitting the original fuel rail, with the return circuit, to his car, the fuel system will match that interim BBY build.

I fully agree with your last sentence.
As long as the cars original fuel system including the fuel rail etc is intact the problem source will be elsewhere.

 

[Joga]

In order to summarize your information @Azim would it be possible for you to list all facts in ONE post.
E.g. state:
The exact timeline and order between events: when did you buy it, when was the engine swapped, when did the starting problem occur (if several ocassions state all), when occured the rough idling.
Tech facts: What is your vehicle VIN (mask the last two digits for privacy).
What is known about the exchange engine (e.g. you mention it was from a 2001 car?)

And could you clarify: If the car was running recently exactly what has happened since then assuming it does not start now?

 

[Azim]

In order to summarize your information @Azim would it be possible for you to list all facts in ONE post.
E.g. state:
The exact timeline and order between events: when did you buy it, when was the engine swapped, when did the starting problem occur (if several ocassions state all), when occured the rough idling.
Tech facts: What is your vehicle VIN (mask the last two digits for privacy).
What is known about the exchange engine (e.g. you mention it was from a 2001 car?)

And could you clarify: If the car was running recently exactly what has happened since then assuming it does not start now?

I will do when I finish work today .

 

[PlasticMac]

In order to summarize your information @Azim would it be possible for you to list all facts in ONE post.
E.g. state:
The exact timeline and order between events: when did you buy it, when was the engine swapped, when did the starting problem occur (if several ocassions state all), when occured the rough idling.
Tech facts: What is your vehicle VIN (mask the last two digits for privacy).
What is known about the exchange engine (e.g. you mention it was from a 2001 car?)

And could you clarify: If the car was running recently exactly what has happened since then assuming it does not start now?

The whole thread is a long read, but everything is in there.
TO save you a long read, in summary, it was bought, by @Azim as a non runner, it started, but was rough, and the original owner, who instigated the engine swap, (BBY to AUA), gave up on it. That's where we started.
It took a while to understand that it wasn't just a case of a good engine with a problem. And then, fully appreciate what we had.
By analysing the differences between AUA and BBY, firstly ignition systems, particularly the crankshaft sensors and now the fuel systems, we are getting close to practical plan I think/hope
Mac.

 

[Joga]

The whole thread is a long read, but everything is in there.
TO save you a long read, in summary, it was bought, by @Azim as a non runner, it started, but was rough, and the original owner, who instigated the engine swap, (BBY to AUA), gave up on it. That's where we started.
It took a while to understand that it wasn't just a case of a good engine with a problem. And then, fully appreciate what we had.
By analysing the differences between AUA and BBY, firstly ignition systems, particularly the crankshaft sensors and now the fuel systems, we are getting close to practical plan I think/hope
Mac.

Yes Mac, I have read the whole thread several times and exactly that lead to the suggestion to summarize it so it will be easier to get the whole picture (and possible understand where any info gaps exist). Lets await it if not only to assure the knowledge base is sound.

 

[Azim]

The whole thread is a long read, but everything is in there.
TO save you a long read, in summary, it was bought, by @Azim as a non runner, it started, but was rough, and the original owner, who instigated the engine swap, (BBY to AUA), gave up on it. That's where we started.
It took a while to understand that it wasn't just a case of a good engine with a problem. And then, fully appreciate what we had.
By analysing the differences between AUA and BBY, firstly ignition systems, particularly the crankshaft sensors and now the fuel systems, we are getting close to practical plan I think/hope
Mac.

After changing all the spark plugs to what im lead to believe are suitable replacement new ones .
Also noticed the fuel pipe from the fuel line had come adrift .
I had refitted that ..
The car would now not start .
I cleaned all the coil packs , which were fitted new when the engine was replaced in 2018.
This morning I replaced the short fuel pipe from the fuel line to the fuel rail for new fuel pipe ..
The previous owner did tell me that the fuel rail was replaced when the garage fitted the new engine for another BBY one .
The battery is as we speak on charge , and im hoping it was a fueling issue due to the perished fuel pipe 18" or so long ..
Ive yet to check the cam and crankshaft sensors .
Picture of my cam sensor and plug below

 

[PlasticMac]

There's no doubt in my mind that the fuel rail, and associated fuel and vacuum connections need to be returned to AUA standard.
Once that's done, we'll have a simpler situation to deal with.
Mac.
To be clear, I mean remove the existing fuel rail assembly completely, and replace it with an AUA assembly, complete with fuel and vacuum lines.
Mac.

 

[Joga]

There's no doubt in my mind that the fuel rail, and associated fuel and vacuum connections need to be returned to AUA standard.
Once that's done, we'll have a simpler situation to deal with.
Mac.

Well, I think if the fuel rail would be changed from what currently appears to be of BBY type it will not match the car since the car is built as a BBY car, VIN to be confirmed though.

 

[PlasticMac]

Well, I think if the fuel rail would be changed from what currently appears to be of BBY type it will not match the car since the car is built as a BBY car, VIN to be confirmed though.

The car was built as a BBY, no question, complete with BBY ECU and looms.
A complete AUA engine was fitted, following timing belt failure on the original BBY, by the previous owner.

The AUA and BBY fuelling systems are, (other than the injectors), mechanical, no ECU involvement. So, if an AUA fuel rail and associated connections are reinstated, it's back to being an AUA engine.
The AUA rail was replaced with the BBY rail during the fitting of the AUA engine.
Once the AUA rail is correctly fitted and plumbed in, fuelling should be as intended. The injectors are common to AUA and BBY.
The BBY ignition system, may be a problem, as the AUA, and BBY crankshaft sensors are different. The trigger rings maybe, different too. But, as it has started and run, (badly), that can be looked at later.
All of this has been posted previously in this thread.
Mac.

 

[Azim]

There's no doubt in my mind that the fuel rail, and associated fuel and vacuum connections need to be returned to AUA standard.
Once that's done, we'll have a simpler situation to deal with.
Mac.
To be clear, I mean remove the existing fuel rail assembly completely, and replace it with an AUA assembly, complete with fuel and vacuum lines.
Mac.

Will i retain the individual coil packs

 

[Azim]

1 Details of my cars with BBY engine

2 Details of the AUA replacement engine .

Hope this helps

 

[Joga]

I will do when I finish work today .

1 Details of my cars with BBY engine

2 Details of the replacement AUA replacement .

Hope this helps

Yes, excellent to collect facts.
In this case all readers can know that the car truly is a build year 2003 => BBY, beyond resonable doubt.
The second picture confirms a car of the 2001 build year => early AUA.
Dont hesitate to add more in the same post.

 

[Joga]

Will i retain the individual coil packs

Yes, clearly recommended. Keep it as much BBY as possible as this is how the car was built in the first place.

Beware that attempting to follow the advice "the fuel rail, and associated fuel and vacuum connections need to be returned to AUA standard" will mean incompatibilities* you will then need to work on.
* e.g. A BBY car has only two fuel lines, while a AUA car has three since the fuel is circulated around the whole car in the latter.

 

[Azim]

Should I not be aiming to make the car the same as the late AUA / early BBY cross over Or dare I say it , get a fully BBY engine replacement ?.

 

[PlasticMac]

Should I not be aiming to make the car the same as the late AUA / early BBY cross over Or dare I say it , get a fully BBY engine replacement ?.

By fitting the AUA fuel system, your engine will be, apart from the ignition system, a standard AUA. The ignition system has to stay BBY, (individual coil packs), as rewiring, to accommodate an AUA ECU is not, practically, possible.
An AUA fuel rail assembly should be obtainable for around £50 - 60.
Put a wanted ad in The Market Place.
Mac.

 

[Joga]

Should I not be aiming to make the car the same as the late AUA / early BBY cross over Or dare I say it , get a fully BBY engine replacement ?.

I have a feeling progress can be best achieved with more info, see post 104.
(But generally I would keep everything BBY-like as it seems to be now, except for the block/head)

 

[Azim]

I have a feeling progress can be best achieved with more info, see post 104.
(But generally I would keep everything BBY-like as it seems to be now, except for the block/head).

The question I have is what is the difference between the head and block of a BBY engine and a AUA engine .
Surely its the ansillary componets that make the engine different ..
Obviously I would like to keep the engine a BBY

 

[PlasticMac]

By fitting the AUA fuel system, your engine will be, apart from the ignition system, a standard AUA. The ignition system has to stay BBY, (individual coil packs), as rewiring, to accommodate an AUA ECU is not, practically, possible.
An AUA fuel rail assembly should be obtainable for around £50 - 60.
Put a wanted ad in The Market Place.
Mac.

Actually, this is wrong, as the BBY fuel system has no provision for the return to tank line, which the AUA fuel system requires.
So, fitting the AUA rail is not a simple task.
Need to think again.
Mac.