AUDI Q7 3.0 TDI blow out injector!

AUDI Q7 3.0 TDI blow out injector!

Author
Discussion

Pilothauksson

Original Poster:

2 posts

75 months

Saturday 3rd February 2018
quotequote all
Hello.
I have a Audi Q7 2011 with a 3.0 tdi 176kw.
Has any one seen something like this? A injector blown out and the bolt holding it snapped? The result is a broken return pipe that spilled disel fuel all over the engine compartment and exhaust. I was lucky that the car was still cold and it did not catch fire.
Cheers.

Pilothauksson

Original Poster:

2 posts

75 months

Saturday 3rd February 2018
quotequote all
My experienced mechanic has never seen anything like this!


j4tuddenham

1 posts

74 months

Monday 19th February 2018
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Yep, I have had this problem twice now, once in June and the other on Saturday. Caused a lengthy truck to get the car from one end of the country back home! both times the stretch bolts have snapped, with a smoking oily engine... same age, a 2011 Q7 86k miles - Not great from Audi

keith9849

97 posts

145 months

Friday 15th June 2018
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Yes, I have seen this problem mentioned elsewhere. What mileage is the car?

ScottishQ7

1 posts

64 months

Tuesday 11th December 2018
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I had exactly the same problem - mine had about 60k on the clock when the injector blew out. Too it to Audi to get fixed, they botched the repair by using a time-sert which failed, and they ended up having to replace the cylinder head as the hole for fixing the new injector was too big due to being drilled out for the time-sert. To cut a long story short, Audi tried to bill me for the 'repair' but ended up, rightly, footing the entire bill.

Interesting to hear this has happened twice before, Audi reckoned this was a first...

S7GVC

207 posts

206 months

Sunday 20th January 2019
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Found this after some googling as this has just happened to me on a 2011 Audi A7.

Im guessing that there is half a bolt still in the engine, so what is the best way to go about repairing this, and how much is it going to cost if I take it somewhere! Also what would have caused it?

Any advice on this one would be much appreciated.

Register1

2,136 posts

94 months

Sunday 20th January 2019
quotequote all
I just had all my wife's injector seals replaced, along with 6 new bolts.
Seem to remember 3 or 4 seals per injector.
2012 with 134k

R1

Matt1147

1 posts

62 months

Friday 1st February 2019
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Our 2011 Q7 had the same problem. Had been idling rough on start up. mechanic looked at it and suggested we run quality diesel in the car as nothing appeared an issue. Today the engine light came on and then the engine went really rough, missing badly. Turns out the injector bolt had blown out. We found it in the tray snapped about 1 cm down the thread. Tow to the mechanic. Hopefully repairing that fixes the rough idle issue and its not a new problem today...

andy97

4,702 posts

222 months

Tuesday 18th June 2019
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Just google for this fault and found this thread.

This has just happened in my wife's VW Tuoareg - same 3 litre V6 TDi engine.

Anyone know what the cause is?

matty779blue

1 posts

182 months

Monday 8th July 2019
quotequote all
Same issue here on 2011 Q7 and 80K miles. I replaced all six as a precaution.
Engine specialist put it down to the fact the bolt/screw had been over tightened and that the bolts have limited tolerance.
An expensive and messy problem. One i dont wish to revisit

Kionao42

1 posts

60 months

Tuesday 9th July 2019
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Hi guys
I have Audi Q7 2010 and I have these issues twice now.... In the beginning when I got my Q7 1 injector failed and as it was under warranty, dealer just replaces it. since then I had issues all the time... 2 blown out injectors with breaking bolts... its been fix but now another injector failed...
So my question is do I need to change all the 6 injectors to don't get this issue again ? Or what is the best thing I Can do.. please advice.
Thanks in advance

andy97

4,702 posts

222 months

Tuesday 3rd December 2019
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We have just had it happen for the second time. Not sure whether it is the same one that was replaced in June or not.
I was also wondering if it was worth getting all of the remaking ones done as a precaution. Any one done this?
Has anyone had a conversation with VAG about this issue on their engines? Poor design or component spec? Is there an upgrade or preventative fix?

Daldude

2 posts

52 months

Sunday 8th December 2019
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I Have Audi Q7 (62) 92k and I have just had this happen again the second time in a month first time warranty company WMS would not pay up even though I had a 5 star 3 year extended warranty, apparently they don’t cover sheared bolts, I wondered if anyone on this thread has had any luck with Audi as this must be a fault and they should be answerable to this?

Daldude

shtu

3,454 posts

146 months

Sunday 8th December 2019
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Check your policy wording, then complain like hell - nothing I saw in the version I could find excluded sheared bolts.


Also - an exclusion like that would be expected to not cover "tried to undo it and it broke" rather than "the thing snapped all by itself".

andy97

4,702 posts

222 months

Tuesday 10th December 2019
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So our second injector bolt failure was a completely different bolt to the one that broke earlier in the year.
I have all the remaining bolts replaced as a precaution.
I e-mailed VW customer service but have not had a reply. Very poor.

Daldude

2 posts

52 months

Wednesday 11th December 2019
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I have been in contact with the garage I bought the car from 8 months ago (Sascron, Thatcham Berkshire) the Warranty Company they use (WMS) and (Audi UK) I will let you know the outcome on here soon, lets hope its all good news

kilarney

483 posts

223 months

Friday 13th December 2019
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Change all the bolts because its most likely a fatigue issue from the cyclic load and unloading. The crack will initiate at the root of the threads. Should have used rolled threads no doubt. I havent seen it to 100% confirm but I have seen many failures like this in industry.

andy97

4,702 posts

222 months

Tuesday 17th December 2019
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I have changed all the bolts so hopefully it is “safe” for a bit while longer.

Had a phone call from VW customer services but dont accept that there is a problem because i havent had it repaired through the dealer network.

Didnt expect any help with fixing the issue, but wanted them to acknowledge the fault. Wont even record it as it didnt go for repair at a dealers.

Moss1

1 posts

14 months

Sunday 12th February 2023
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I had this happen last year and by the time my mechanics had got the broken bolt out, the threads were knackered, resulting in having to have a new bolt and seal fabricated.
My second injector has just gone and having removed the bolt I’ve found 5-6 threads from the engine block still on the bolt. Having attempted to put in a new bolt it’s now just spinning due to having no threads. When measuring up it would seem that only half the threads on the bolt go into the block. Seems to be a bit of a design floor there. Surely if the bolt was 100mm longer it would have twice the threads inside and we wouldn’t be having this problem.