A2 horrid car (now with multipe error codes)

Hi All. Found a problem with the connection on the solenoid. Fixed that and the P1028 error is gone but I still have random misfire. P0300, 302, 303 and 304. I swapped the coils between 1 and 4 but the misfire stayed on 4. So is it possible that have 3 faulty plugs(used Bosch at last service) or 3 faulty connectors( then why random). Any idea's?
Thanks
Russ
 
The good guys here told me in May 2014, replace injectors! Which I did almost a year later, a year of random misfirings. A totaly diffrent car after that. And no matter how I push it through the Norwegian swings and Danish and German motorways, it works like a clockwork, well, a noisy one. I wish I had replaced the injectors at the first service I had, when they pulled the engine up to replace the timing belt.


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Grrrrr, injectors are not fun. Well, it doesn't look like much fun, but If there is a possibility it will work, then I shall get to it. Thanks Darko.
 
russeleoin said:
Grrrrr, injectors are not fun. Well, it doesn't look like much fun, but If there is a possibility it will work, then I shall get to it. Thanks Darko.
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I hope you'll get it fixed, injectors or else, and have fun driving it without engine light on!
 
Interestingly the engine light isn't on. I use the ODBII Bluetooth scanner and Torque on my phone and that tells me what is going on. The warning light was all about ABS but I have been over the car with a fine tooth comb and there is nothing wrong with the brakes so I just reset it and if it comes back I will take it to the garage. The car is running better now that I have the solenoid fixed, and if I can get the misfire sorted( I hope) that will address the power shortage as well.
 
I was having a think about the injectors last night. The code that I am getting is a misfire, but I assume that the way it is detected is through feedback from the coil? If that is the case then the injectors shouldn’t help? If the misfire detection is a combination of injector feedback and coil feedback, then injectors could well fix the problem. Any thoughts? Other than ECU, is the an electrical component upstream from the coils that controls timing or spark?
 
Coils ? why ?
A misfire result in a incomplete combustion. The O2 sensors should see that (the first lambda probe).
Or maybe the knock sensors...

BTW, my FSI suffered from misfires too.
And new injectors cured that...
There was only one that was faulty. But while at it (at Audi rates...), better replace the 3 others too.
At DIY labour rates (and KWYD = knowing what you're doing :) ), you can only change one injector. And clean them.
 
Is that how the misfire is detected? I would have thought that the Lambda sensor would not be sensitive enough to be able to pick up individual cylinder misfires, but that would be an uneducated view. In electronic terms, if the plug fails to spark the first component to know(that has any logic) is the coil, hence a misfire could be detected there first. It’s also what searching the interweb told me to look at first. On an aside, I went to Pease Pottage breaker and found a 1.6fis (VW) that had been in a bend and got a set of injectors from there. £1 each, so I thought I could clean them up( good clip on youtube) and swap them over. Its then just my time and I enjoy playing in the garage anyway.
 
russeleoin said:
I...£1 each...
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Bl**dy hell. That's a deal and a half. Well done.

On the subject of mis-fires I can suggest can be done through sensing circuitry within the ECU that looks at the spark plug. At least that was how it was done on my Saab 9000 along with knock detection that allowed high levels of boost to be programmed in and varied depending on the feedback that was given to the ECU. All that was developed in the early 90's, a good ten years before the A2 was made.
Don't know if our little cars work in this manner, but it wouldn't surprise me.
 
I still have my 9000 Aero and all that works fine if you use exactly the right plugs and nothing else. I was reading this month's Car Mechanics and it said that the wrong plugs can feed misinformation back to the ECU. All genuine (non GM) Saab engines are so much better than anything the VAG has produced over the years... But the A2's body design is better than anything Saab ever made. Swings and roundabouts.
 
On the 9000 Aero (B234R) it's because the DI pack needs special plugs for knock sensing. With the incorrect ones (or incorrectly gapped ones) it will cause knock and the ecu will pull back the boost control and essentially drop the power. The Trionic system is capacitive and it uses the plugs to detect preignition. 9000 Aero's are great cars, I miss mine sorely, but it's being loved by it's new owner.

Incidentally, the FSI needs special plugs, and can quite often be fitted with the wrong ones by garages. Mine had the wrong ones in it when I got it.
 
Mine is living in a friend's barn but it's not all that accessible at the moment, which is a shame, but having invested so much time in her over the years, I don't want to part. That's a far better description of Trionic than I had up my sleeve! Particularly with the FSI, I think it's a 'broken glass syndrome' thing: you need to stamp on every single fault as soon as it comes up or they can self-perpetuate...
 
russeleoin said:
Is that how the misfire is detected? I would have thought that the Lambda sensor would not be sensitive enough to be able to pick up individual cylinder misfires, but that would be an uneducated view. In electronic terms, if the plug fails to spark the first component to know(that has any logic) is the coil, hence a misfire could be detected there first. It’s also what searching the interweb told me to look at first. On an aside, I went to Pease Pottage breaker and found a 1.6fis (VW) that had been in a bend and got a set of injectors from there. £1 each, so I thought I could clean them up( good clip on youtube) and swap them over. Its then just my time and I enjoy playing in the garage anyway.
Click to expand...

You are right, the Lambda probe can't determine which cylinder is at fault.
On the other hand, the fault is with the fuelling, not the spark...
So I think that's with the crank sensor that misfires are detected through rpm alterations.

You are doing an interresting job :)
Keep us informed !
 
Just scanned some service papers lying around...
If you got cheap injectors and do the job yourself, you can save a lot.
Quoting from my service bill dated 20th July 2015:
...
EINSPRITZVENTILE AUS- U. EINGEBAUT 288.29 EURO
...
036 906 036 4 VENTIL 716.10 EURO
...
Plus taxes, I guess.
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After more than 45 years working as a mechanic and having seen and experienced most car problems I agree with the last comment the Audi a2 is a wonderful car ,I have had many Audi,s A6 2.8 quattro. 2.2 quattro coupe. 3 coupes 2.2 ltrs. Finally my pride and joy a93 Audi coupe s2 230 bhp ,yet the little a2 gives me immense pleasure in driving ,yes it has its faults name me any other car which does not ,so the lesson is DO NOT KNOCK THE A2
 
The little beast is such a challenge. The handling feels good, a bit stiff but good, the engine above 3000rpm is very good, it’s just then normal driving range that is a problem. I was going to have a look at the injectors last weekend, but as is always the case with this car, lift the covers and find something more pressing to deal with. I had to deal with a coolant problem, so I didn’t get round to injectors. At the last service 6000k miles ago, I put in Bosch plugs and I have replaced all the connectors as well, so am fairly comfortable that it’s not plugs or connectors. That leaves injectors or ECU( or something in between). I am, torn between disposing of it and trying to fix it. I suppose I need my head read instead!
 
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