Author Topic: AAN: transmission vibration, or misfire?  (Read 5677 times)

0 Members and 1 Guest are viewing this topic.

Offline zeitgeist

  • *
  • *
  • Posts: 154
AAN: transmission vibration, or misfire?
« on: July 23, 2012, 09:49:04 pm »
Edit: Mystery solved, hanger bearing at fault apparently

« Last Edit: October 25, 2012, 11:38:45 pm by zeitgeist »
UrS6 6 speed

Offline slowburn

  • #
  • *
  • Posts: 1679
  • how many is too many?
Re: AAN: transmission vibration, or misfire?
« Reply #1 on: July 23, 2012, 11:17:08 pm »
I'm no genius,but hitting anything in your car with enough force to buckle a wheel on the open road cannot be a good thing, and is probably a good place to start finding the root of the problem.I would lean towards the impact having bent something in the tranny.....
89 200 quattro exclusive
85 coupe quattro
85 coupe GT
72 fiat 124 coupe
97 corolla wagon

Offline zeitgeist

  • *
  • *
  • Posts: 154
Re: AAN: transmission vibration, or misfire?
« Reply #2 on: July 26, 2012, 03:04:15 pm »
Giltrap's transmission specialists took it for a drive and said 100% not transmission (which I found hard to swallow, but there you go).

So I guess I'm looking engine mounts, spark plugs, coils.
UrS6 6 speed

Offline zeitgeist

  • *
  • *
  • Posts: 154
Re: AAN: transmission vibration, or misfire?
« Reply #3 on: August 02, 2012, 11:20:27 pm »
Misfire ish- symptoms, after running for about 30 mins the idle gets more lumpy. Yet still removing seperate injector plugs makes it run worse. No codes thrown from the engine or transmission. Engine and trans test as running at acceptable temperatures.

'Uses a bit of fuel, but they use heaps anyway so...

Shudders most in first gear, barely at all in other gears, vibration in 3rd and 4th 'usually' not always. Foot down in 2nd 3rd 4th does not achieve same shudder as in first gear. As always, gears change perfectly fast and smoothly.

Tomorrow I will test coolant temp sensor G62. Then shoot myself.

Stab in the dark would say inspect driveshaft, which may still be shot as well; but nothing to do with the lumpy idle when hot?

C'mon guys, no one wants a challenge? ideas?
UrS6 6 speed

Offline 00quattro00

  • ###
  • ***
  • Posts: 5327
Re: AAN: transmission vibration, or misfire?
« Reply #4 on: August 02, 2012, 11:24:21 pm »
Where abouts are you? You can try some bits from my aan
Land Rover Discovery 300tdi
Land Rover 110 4bd1t

Offline zeitgeist

  • *
  • *
  • Posts: 154
Re: AAN: transmission vibration, or misfire?
« Reply #5 on: August 02, 2012, 11:28:46 pm »
I'm in Takapuna, are you Auckland too?

That would be off the hook handy... I would need to make a plan of what to try

Edit: Damn, i see you are Hastings
UrS6 6 speed

Offline Lomax

  • *
  • *
  • Posts: 180
  • Czech Republic
Re: AAN: transmission vibration, or misfire?
« Reply #6 on: August 05, 2012, 11:39:42 am »
Im not sure if I can be much help, but Im in Auckland (quit far tho - Manurewa) so we could meet up or smtin
1994 Audi UrS6 6-speed manual
2002 Audi Allroad 2.7T
1990 Mk2 Golf, 1994 UrS4, 1990 Audi 80 2.0E Manual, 1990 Audi 80 2.0E donor, 1991 Audi 90 2.3E, 1985 Toyota Corona

Offline zeitgeist

  • *
  • *
  • Posts: 154
Re: AAN: transmission vibration, or misfire?
« Reply #7 on: August 05, 2012, 01:52:40 pm »
Hey that's great thanks, I'll be in touch once I make a clear plan with desired outcomes etc :)
UrS6 6 speed

Offline zeitgeist

  • *
  • *
  • Posts: 154
Re: AAN: transmission vibration, or misfire?
« Reply #8 on: August 18, 2012, 02:42:11 am »
high gear vibration eliminated (fingers crossed) on removing, cleaning and tightly refitting bypass valve.

Issue with takeoff  in-gear shudder remains, surely related to 0.6/7 bar gauge pressure reading at idle, I remember my old white sedan being 0.4. Intake manifold gasket? There isnt anything else I can think of apart from  BPV vacuum line which appears fine. Can't hear any hissing at any speeds and idle is stable. When I first got the car there was a squeal or hiss once or twice on boost, but I am now putting that down to BPV (710A) being old dirty and misaligned
UrS6 6 speed

Offline BB

  • ####
  • ****
  • Posts: 16277
Re: AAN: transmission vibration, or misfire?
« Reply #9 on: August 18, 2012, 09:04:33 am »
The best place to get your Audi fixed is at Euroline.
 Rob has a very very good mechanic who solved a whole heap of issues that were too hard for me on a S6 for a good price.
 They have all the parts they need either new or second hand on site and they have the experience and tools that not many have.
 They replaced the fuel pump and found hidden broken wires and all sorts of stuff.
 I was well impressed at the price as well as he ended up spending many many hours.
The end is nigh, but the end of what is the question?

Offline zeitgeist

  • *
  • *
  • Posts: 154
Re: AAN: transmission vibration, or misfire?
« Reply #10 on: August 18, 2012, 09:47:55 am »
Hey cheers for that, good to know, so far it's been near impossible to get expertise on these cars
UrS6 6 speed

volcanoblack

  • Guest
Re: AAN: transmission vibration, or misfire?
« Reply #11 on: August 19, 2012, 02:13:13 pm »
I agree with the trans shop that hitting a bump is not likely to cause internal trans damage. More likely suspension damage or driveline (CV joint) - which you have checked. (?)

Also agree Audi Gods are not happy. Hard bump could = loose wire somewhere?

Why not replace the BPV with a 710N? The 710A diaphragm is much flimsier. Since cleaning this solved some of your problem.

Injector #1 fault code - maybe this injector is not working properly even though it seems to be clicking away. (easy to check with parts swap as volunteered from other members here).

I know this will sound off the wall - but you did change the trans fluid before this all started happening right? I don't know about the DEX3 fluid you put in but I know we had a discussion about how much fluid to use.

Checking the fluid level is near impossible with your situation (no dipstick and no check level plug hole).

So my suggestion - unless you find another reason for the vibration - is to drain the fluid out of the trans and have the shop measure it. Check this against the recommended starting point for filling the trans after service, "add approx. 2.7 liters of ATF".

If the amount of fluid that comes out is vastly different, refill the trans making any adjustment you want to get closer to the 2.7 litres.

volcanoblack

  • Guest
Re: AAN: transmission vibration, or misfire?
« Reply #12 on: August 20, 2012, 10:52:12 am »
Here's a post over on QuattroWorld with what can go wrong in suspension if hitting something hard enough.

http://forums.quattroworld.com/s4s6/msgs/198829.phtml

cheers.


Offline zeitgeist

  • *
  • *
  • Posts: 154
Re: AAN: transmission vibration, or misfire?
« Reply #13 on: August 23, 2012, 02:06:49 pm »
Interesting points, now that I've had the trans shop assess it as 100% not the tranny, I have been able to accept that it is OK. It after all changes smoothly and quickly.

My next port of call is misfire due to vacuum leak between the throttle body and intake ports. Being as it seems to be more rough when hot after driving a while, I'm leaning towards thermal expansion increasing the size of a vacuum leak. It's idle manifold pressure is .6-.7 bar which is so different to the .4 that the white sedan used to read.
UrS6 6 speed

Offline Lomax

  • *
  • *
  • Posts: 180
  • Czech Republic
Re: AAN: transmission vibration, or misfire?
« Reply #14 on: August 23, 2012, 06:54:06 pm »
my idle manifold pressure is also around 0.7 bar, but then I think i might have a leak somewhere too...

with the thermal expansion, shouldnt that decrease the leak? since the material is expanding?
1994 Audi UrS6 6-speed manual
2002 Audi Allroad 2.7T
1990 Mk2 Golf, 1994 UrS4, 1990 Audi 80 2.0E Manual, 1990 Audi 80 2.0E donor, 1991 Audi 90 2.3E, 1985 Toyota Corona