1.4 petrol poor idle issues

Ive had the car for about 2 years .
The car always started with a rough idle .
I only decided to put it on the road this december , when my daughtered turned 18yrs old .
What I thought would be a simple fix turned out not to be .
I will check if the original engine and the new engine are the same or different .
I remember the original owner told me the engines were different .
I will try to find out more about the original and new engine .
 
Azim said:
Ive had the car for about 2 years .
The car always started with a rough idle .
I only decided to put it on the road this december , when my daughtered turned 18yrs old .
What I thought would be a simple fix turned out not to be .
I will check if the original engine and the new engine are the same or different .
I remember the original owner told me the engines were different .
I will try to find out more about the original and new engine .
Click to expand...
Check the ECU date please.
Mac.
 
Azim said:
You could be right .
So would a change of ecu be required ?.
Click to expand...
changing the ECU would require the ignition key barrel & key as well as the clock changing at the same time, I dont believe you can just change ECU alone.
 
Azim said:
The original engine seams to be a BBY.
Click to expand...
OK, this will probably rule out any ECU compatibility issues. I would still progress to confirming that you can see a spark when cranking as per an earlier post.

If you think about it, the ECU will trigger the spark plugs and indeed the injection of fuel based on where it thinks the crank is, so checking there is a spark is a good start. Would you say that the cranking speed is OK, ie the battery is OK?

J
 
Azim said:
The original engine seams to be a BBY.
Click to expand...
The part number, and date on the ECU will help us get a clear picture of what you have.
If you have the original service book, there will be a a printout stuck on the first page. It'll give us the original build detail, so if you have it, please take a picture of it.
What year was your car first registered?
Sorry for all the questions, but it's good to have a clear view.
Mac.
 
birtyA2 said:
OK, this will probably rule out any ECU compatibility issues. I would still progress to confirming that you can see a spark when cranking as per an earlier post.

If you think about it, the ECU will trigger the spark plugs and indeed the injection of fuel based on where it thinks the crank is, so checking there is a spark is a good start. Would you say that the cranking speed is OK, ie the battery is OK?

J
Click to expand...
Yes the cranking speed seems to be ok .
And the battery is fine too
 
PlasticMac said:
The part number, and date on the ECU will help us get a clear picture of what you have.
If you have the original service book, there will be a a printout stuck on the first page. It'll give us the original build detail, so if you have it, please take a picture of it.
What year was your car first registered?
Sorry for all the questions, but it's good to have a clear view.
Mac.
Click to expand...
The car was first registered in 2002 .
So the car is a 02 .

The replacement engine came from a 2001 .
 
Ami said:
changing the ECU would require the ignition key barrel & key as well as the clock changing at the same time, I dont believe you can just change ECU alone.
Click to expand...
Morning Ami,

No need to swap the ignition key barrel, key fob or any door locks. Yes you can swap the ECU out independently but first-up is to obtain the SKC from either the original instrument cluster or original ECU followed by the replacement ECU. Once the SKCs have been grabbed then simple follow the Ross-Tech guide:


First half of the YouTube clip is instrument cluster specific so skip to 3 minutes 22 seconds for the ECU/ECM

Kind regards,

To mm
 
2work said:
Morning Ami,

No need to swap the ignition key barrel, key fob or any door locks. Yes you can swap the ECU out independently but first-up is to obtain the SKC from either the original instrument cluster or original ECU followed by the replacement ECU. Once the SKCs have been grabbed then simple follow the Ross-Tech guide:


First half of the YouTube clip is instrument cluster specific so skip to 3 minutes 22 seconds for the ECU/ECM

Kind regards,

To mm
Click to expand...
Morning Tom:
Thanks for the explanation, I thought if one is unable to go through the process of obtaining SKC code etc and If you have all 3 items them maybe just mechanically change those parts.
Thank you as always,
Ami
 
I wasn't suggesting an ECU swap, just wanted to check that the engine type matched the ECU.
I had wondered if the original engine was AUA, and although it's engine is now a BBY, maybe the original, (AUA), ECU had not been swapped. That idea now seems unlikely.
Mac.
 
Azim said:
The original engine was a BBY.
ive yet to confirm what the new engine is .
Click to expand...
Hi Azim

As you mention individual coil packs, the working assumption is that this too is a BBY. Going to be a very wet and windy day today so maybe one for tomorrow but I would pick a cylinder, remove the plug, reconnect the coil pack and rest on the top of the engine then get someone to crank while you look for signs of a spark as a next step

best wishes

J
 
birtyA2 said:
Hi Azim

As you mention individual coil packs, the working assumption is that this too is a BBY. Going to be a very wet and windy day today so maybe one for tomorrow but I would pick a cylinder, remove the plug, reconnect the coil pack and rest on the top of the engine then get someone to crank while you look for signs of a spark as a next step

best wishes

J
Click to expand...
I will do that as soon as the weather allows me to
 
Morning .
Ive been in touch with the original owner and Audi dealers
The engine from the doner car was a AUA ..
He also mentioned that the head on the engine looked different .
Ive got a feeling that everything has neen swapped from the BBY engine on to the AUA engine .
Also I was told that a forum member had advised the garage who carried out the engine swap on how to do the conversion .
Some where along the line , the engine failed to start and the original owner gave up on the car as bills built up .
I have bills of £1500 on new parts and labour .
 
Last edited:
Azim said:
Morning .
Ive been in touch with the original owner and Audi dealers
The engine from the doner car was a AUA ..
He also mentioned that the head on the engine looked different .
Ive got a feeling that everything has neen swapped from the BBY engine on to the AUA engine .
Also I was told that a forum member had advised the garage who carried out the engine swap on how to do the conversion .
Some where along the line , the engine failed to start and the original owner gave up on the car as bills built up .
I have bills of £1500 on new parts and labour .
Click to expand...
I would confirm, by looking, that the ECU is the correct one for the BBY, just to be on the safe side.
If all's well, sparks and fuel are all you need, to at least get the engine to fire, and attempt to run.
I'm sure other BBY owners will help on checking fuel at the engine.
The VCDS scan of the engine will, I think, include the ECU part number, so if you have it, take a look.
Good luck.
Mac.
 
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