Misfire

[robert eckersall]

Recently my 2011 a3 8p lost power and engine shaking when on idle. Rac tested it and said it showed misfire on injector 4 and it was loom damage. When it went to the garage they said nothing wrong with the loom and it was injector 4. They replaced number 4 and misfire changed to cylinder 3. We had all 4 injectors sent off and tested. 1 needed calibrating another had a slight blockage. So they sorted them out and when replaced back in the car it still had the misfire. So now the garage is saying they think it's the conrod or bearings. Is this likely? As they have quoted a silly price for for stripping the engine down. This is at a rac approved garage. (Whatever that's meant to mean)

Anybody had this before??

Edited November 5 by robert eckersall
Missed info

[Steve Q]

I notice on the other post you've had a dpf and egr delete. I wonder if this has anything to do with this work and the remap? 

Apparently the removal of a dpf ect can increase engine temps which can put more strain on pistons, turbo ect. 

[cliffcoggin]

It seems that EGR and DPF removal/blanking is a recognised way to ruin engines. Stevey Y has been warning about this for some time on this forum.

[Hammie1982]

Robert,

I dont know how a bearing issue would be causing a misfire, unless the piston slap was REALLY bad and then you would be loosing oil and it would sound like a bag of spanners in a washing machine.  

What are you using to diagnose the issue? Is it a garage computer or a private VCDS / other ODB plug in unit?

It should be able to pinpoint where the misfire is coming from! I have seen reconditioned / reprogrammed injectors throw up errors in the past. Especially on remapped cars.

It might be worth getting a second opinion on the bottom end, as without hearing the car or knowing the fault codes, anyone could be throwing darts into the air and waiting to see what fault it picks. 

[Elvis08]

Hello. Well after 8 weeks in the garage. My car is finally gonna be ready today. Apparently a bolt head or nut found its way into the engine and went through a vale stem housing and made the valve not open and close properly. And as a result of this this is my bill. Am I getting ripped off????

 

Edited Wednesday at 10:48 AM by Elvis08

[Magnet]

Welcome Robert and thanks for joining.

I’m not sure why you have tagged your post on to the one you have chosen, since there doesn’t seem to be any relevance. 
Anyway…..

I’m sorry to hear of your problem, but before discussing prices, I would be far more interested/ worried about where your bolt head or nut came from, but…

To try to answer your question re. price and are you being ripped off with 4x ? , which suggests you think you are. 
You seem to be paying for around 10 hours labour at £x/hour to start with, and I would have thought that 10 hours could have been more. You have had the cambelt renewed together with injectors - I think. Head gasket set , and probably valve/s, head skimmed etc. etc. To me, it’s around expectations, but I could be wrong. 
It might be worth appreciating Robert that you could be lucky that the garage agreed to undertake the work, rather than write off the engine - as many would. 
Without further knowledge, I would be interested in your views which lead you to question why you question if you may have been ripped off - as you say. 
Kind regards,

Gareth. 

 

[cliffcoggin]

£2500 for a head overhaul does not sound too bad on the face of it by modern standards, particularly as the timing belt and water pump were included in the job, but there's something incomplete about the explanation.

Firstly, where did this errant bolt or nut come from, and how did it enter the engine.

Secondly, if a bolt or nut had found its way into the engine and thereby damaged a valve, the repair would have needed at least one new valve yet there is no mention of new valves on the invoice unless that is what is meant by "cylinder head set".

[cliffcoggin]

Robert.

Why have you rejoined the forum under the guise of Elvis08 when were already a member as robert eckersall? Do you have a problem logging in?

[Elvis08]

Yes

[Magnet]

What logging in problems did you have then and what comments do you have in reply to the responses so far about your bill Robert? 

[cliffcoggin]

27 minutes ago, Elvis08 said:

Yes

This could be a long night if all your replies are to be monosyllabic. How about giving us some details so we can try to resolve the problem.

[robert eckersall]

Right first I tried logging in and resetting my password but it sill didn't seem to work. I have done it again and as you can see it worked this time. 

Right secondly I do not have a clue where the bold head/nutt came from and neither do they. I have only had 1 injector replaced. The nutt didn't damage the injector but just the stem housing so they have replaced all the valve stems but not any of the valves because they was not damaged it was just stopping it from opening and closing properly. I didn't know if I am being ripped off or not that's exactly why I asked the question. It's just seemed a big !Removed! bill that's all. If others think that it is about right for the work that there doing then I'm fine with that.

 

Thanks for the replys

[Magnet]

OK Robert.

We will ask Admin to delete your Elvis sign on then, to avoid confusion. 
Thanks for the additional information, but it seems everyone is confused about the origins of this mystery nut then -?  Very strange, since you would expect something inside your engine is missing this vital component! 
Not sure what words you have used which resulted in the Removed bit, but when you say ‘If others think it’s about right…..’ - are you suggesting you need additional responses from other members as well as what you have received so far? 
Kind regards,

Gareth. 

[robert eckersall]

Yeah good idea thanks. Yes I wish I knew cause its the most expensive nutt ever for me. Lol. Oh it wasn't even a very bad word. It was just blood with a why on the end. Well if anybody else reply then they do if not then not too worried

[Magnet]

Thanks for asking us to advise you.

[cliffcoggin]

Yes the cost was expensive, but unless you can do the job yourself you don't have any option but to grin and bear it.

My worry is still the origin of the nut. If it fell off some other component then that component is liable to fail at some point. I assume the garage would have identified it if possible so I suppose it must remain a mystery.

Regarding the password change, there can be a delay in registering that sort of change in my experience. I don't know why that should be but the forum administrator will probably be able to explain it.

[robert eckersall]

Hi. Well the garage have come up with an explanation as to the whereabouts of where the bolt has come from. They recon it's a egr bolt that's been dropped in when I had the egr blanked off. 

[cliffcoggin]

I did wonder briefly if it could be associated with the EGR removal, but said nothing as I could not imagine how the bolt would get into the engine.

Are you going to claim against the company that removed the EGR?