There is no significant difference between the AUA Cylinder Head and Block, and the BBY. The difference is the fuel system, and the ignition system. Power output is the same.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
That is what we're trying to do, but not very successfully, at least in my case.I dont know why we cant go fully BBY.
Or at least the late AUA / BBY cross over engine , before they moved to fully BBY .
Im pretty sure the block / head is the same on both engines
If you still dont find it reasonable to supply general information (as suggested in post 104) then you are limiting the possibility that you will recieve efficient help, and risk spending time chasing the wrong hen.I dont know why we cant go fully BBY.
Or at least the late AUA / BBY cross over engine , before they moved to fully BBY .
Im pretty sure the block / head is the same on both engines
My understanding is they are the same. The differences are in the fuel system, ignition, crank case breathing and air box. It very much looks like you have the BBY fuel rail which is correct for the rest of the car and indeed the ignition is with individual coil packs now, so broadly it should run; indeed we shouldn’t loose sight of the fact it has with this configuration.I dont know why we cant go fully BBY.
Or at least the late AUA / BBY cross over engine , before they moved to fully BBY .
Im pretty sure the block / head is the same on both engines
There is no significant difference between the AUA Cylinder Head and Block, and the BBY. The difference is the fuel system, and the ignition system. Power output is the same.
The only way for you to have a genuine BBY engined car, is to remove the AUA you have now, buy a BBY engine, complete, and fit it.
As it did with the previous owner, getting the AUA/BBY hybrid running in your BBY car is proving to be a challenge.
That is what we're trying to do, but not very successfully, at least in my case.
Because your car is built for a fuel system with no return to tank bypass line, the BBY fuel rail has to stay. My apologies for my recent suggestion to fit an AUA rail, which might well work, but would need a new fuel line back to the tank to work, so not as good an idea as I thought.
I'm sure it can be sorted, just not sure quite how.
Maybe there is nothing wrong with the set up you have. Need to establish if there is fuel pressure at the rail, with ignition on.
Back to the basic sparks and fuel again.
Simple question did you check the fuel pipe pictured as the blue inline connector may have a non return valve fitted allowing fuel to only flow in 1 direction!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
Hi .Simple question did you check the fuel pipe pictured as the blue inline connector may have a non return valve fitted allowing fuel to only flow in 1 direction!
ie: maybe preventing flow, simple blow through should prove .
Hope that helps
Keith
There was a comment made earlier in the thread about a set of replacement plugs that someone fitted (not necessarily in this chain of events) that had a different length nose / conductive piece at the very top of the spark plug (the insinuation being that there is a dimensions change between AUA and BBY models).My understanding is they are the same. The differences are in the fuel system, ignition, crank case breathing and air box. It very much looks like you have the BBY fuel rail which is correct for the rest of the car and indeed the ignition is with individual coil packs now, so broadly it should run; indeed we shouldn’t loose sight of the fact it has with this configuration.
The change from rough running to not starting occurred after a change of spark plugs so I agree with other views that we should pursue the basics, are we seeing a spark, is fuel being injected. Sod’s Law doesn’t rule out a co-incidental failure of - for example - the cam sensor but, we should be able to reach this conclusion by systematic confirmation that the things needed for combustion; fuel, air and spark are present or not
Yes, if it was me I would be checking for a spark from one of the new plugs and one of the oldThere was a comment made earlier in the thread about a set of replacement plugs that someone fitted (not necessarily in this chain of events) that had a different length nose / conductive piece at the very top of the spark plug (the insinuation being that there is a dimensions change between AUA and BBY models).
Could it be that right now we've got AUA plugs where the plug connector male end isn't compatible enough with the BBY individual coil pack female end to effect reliable spark generation?
I will do .Yes, if it was me I would be checking for a spark from one of the new plugs and one of the old
J
I've looked at the parts diagram and confirm this to be the case. On paper, plugs are identical spec whether AUA or BBY with either ignition coil solution.I was told by Audi dealers that the plugs are the same between both engines .
I will remove the new ones and compare them the original ones that were in the AUA engine .(when the engine was running ).
I will up date with pictures .
I've looked at the parts diagram and confirm this to be the case. On paper, plugs are identical spec whether AUA or BBY with either ignition coil solution.
I am getting a good spark when I have tested spark plug when placing near engine for earth .I've looked at the parts diagram and confirm this to be the case. On paper, plugs are identical spec whether AUA or BBY with either ignition coil solution.
Glow plug Audi A2 (A2) 2003 year Audi 905000
glow plug Audi A2 (A2) 2003 year Audi 905000 spare partsaudi.7zap.com
Wow, what on earth is that, looks more like a sample of oil that petrol. Do you know when the fuel filter was last changed? A candidate for change now for sure
I am getting a good spark when I have tested spark plug when placing near engine for earth .
The old and new spark plugs are identical in size and the marking on the plugs them selves .
How ever I have dragged out unusaully dark fuel when I used a pump to draw the fuel from the tank at the incoming fuel line to the engine bay ..
The fuel looks suspect.
I may empty the tank tomorrrow and put fresh fuel in , just in case .
it looks like a cross between Bunker Oil and Espresso .. !
I am getting a good spark when I have tested spark plug when placing near engine for earth .
The old and new spark plugs are identical in size and the marking on the plugs them selves .
How ever I have dragged out unusaully dark fuel when I used a pump to draw the fuel from the tank at the incoming fuel line to the engine bay ..
The fuel looks suspect.
I may empty the tank tomorrrow and put fresh fuel in , just in case .