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tadd
Audi Nut
Joined: Apr 23, 2012
Posts: 61
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 Posted:
Fri Mar 22, 2013 12:50 am |
 
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Hi guys,
Two days ago I have noticed that the engine is not running very good, rough idle (not alot) and strange juddering on lower rpms (up to 1700-1800) on light load... No difference on high rpms.
poor diesel? clogged fuel filter maybe? injectors? MAF? pump?? 
Should I start with new fuel filter and put new fuel in to check it out???
AUDI 100, 2.5 TDI 1992, AAT |
Last edited by tadd on Thu May 09, 2013 10:36 am; edited 2 times in total |
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artb
Needs to get out more
Joined: Nov 10, 2009
Posts: 125
Location: northants
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Fri Mar 22, 2013 6:46 pm |
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have a listen for an air leak .. |
_________________
mk1 a6. 2.5tdi avant
180k mls
chipped,de-cated and lowered.... |
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tadd
Audi Nut
Joined: Apr 23, 2012
Posts: 61
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Fri Mar 22, 2013 8:46 pm |
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ok, i changed the fuel filter and there is no difference....
now new kind of judderting...
when i start it, everything is perfect, runs smooth...
when it gets 70- 85 judders like hell, like 2 injectors arent working..
and then when i ride it to the floor and it gets to 90c all judder stops and its working perfectly...
i tried unscrewing injectors one at the time and the it still judders.. tried unplugging upper (on the top) temperature sensor and MAF, no difference....
what now???? |
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tadd
Audi Nut
Joined: Apr 23, 2012
Posts: 61
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Fri Mar 22, 2013 8:57 pm |
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| artb wrote: | | have a listen for an air leak .. |
well, i did notice hard brake pedal when car/engine is not working for 2+ hours.. where should i start? |
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tadd
Audi Nut
Joined: Apr 23, 2012
Posts: 61
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Sat Mar 23, 2013 10:34 am |
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One more question, can EGR thats stuck open or closed cause this problems??? |
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HF1600ie
Needs to get out more
Joined: May 03, 2011
Posts: 119
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Sat Mar 23, 2013 1:07 pm |
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I dont remember feeling my brake pedal stiff after 2 hours parked.
You can try blocking off te EGR with a plate to see if it´s EGR related. In my caase the only difference I feld was that the transition from idle to movement was quicker with a lot less grey/black smoke. And turbo spool up a lot quicker.
But you never know... you must start somewhere... |
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tadd
Audi Nut
Joined: Apr 23, 2012
Posts: 61
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Sat Mar 23, 2013 1:14 pm |
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just came from outside, egr is ok... cleaned it and its workng ok, it wasnt that dirty anyways... looked for wacuum leaks, all ok...
20 min of driving and judders like HELL again ! its even hard to take of in the first gear fom all that juddering/missfiring.... |
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SkyRocketeer
Camped on the site
Joined: Feb 14, 2011
Posts: 346
Location: Newport S-Wales
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Sat Mar 23, 2013 9:01 pm |
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checked the pump timing? might be mega advanced or something...? |
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tadd
Audi Nut
Joined: Apr 23, 2012
Posts: 61
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Sun Mar 24, 2013 10:07 am |
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| SkyRocketeer wrote: | | checked the pump timing? might be mega advanced or something...? |
maybe, tomorrow I have made an appointment at bosch service... he said most probably its electric on fuel pump... he has a brand new, will change it and call me  ... i'll let u know
thx all |
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HF1600ie
Needs to get out more
Joined: May 03, 2011
Posts: 119
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Sun Mar 24, 2013 10:54 pm |
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Long time ago I had a long juddering whenever I was taking off from idle, but idle was fine.
It was the clutch that didn´t hold strongly so it slided various times before finally crushing itself agains the double mass flywheel.
The engine shaked BIG TIME !!!! I even broke an engine support because of this |
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tadd
Audi Nut
Joined: Apr 23, 2012
Posts: 61
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Mon Mar 25, 2013 2:41 am |
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| HF1600ie wrote: | Long time ago I had a long juddering whenever I was taking off from idle, but idle was fine.
It was the clutch that didn´t hold strongly so it slided various times before finally crushing itself agains the double mass flywheel.
The engine shaked BIG TIME !!!! I even broke an engine support because of this |
yes... i understand... ii understand how everything works on car or any engine... in my free time i repair scooters and mopeds. only problem is 21 yo electronics...
thx |
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SkyRocketeer
Camped on the site
Joined: Feb 14, 2011
Posts: 346
Location: Newport S-Wales
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Mon Mar 25, 2013 8:02 pm |
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I doubt the problem is 21yo electronics. Sounds mechanical or fuelling.
Checked the timing belt? maybe the front belt has jumped a tooth, putting it all out, or perhaps even the tensioner is playing up, thus random(ish) juddering. |
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tadd
Audi Nut
Joined: Apr 23, 2012
Posts: 61
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Mon Mar 25, 2013 8:32 pm |
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| SkyRocketeer wrote: | I doubt the problem is 21yo electronics. Sounds mechanical or fuelling.
Checked the timing belt? maybe the front belt has jumped a tooth, putting it all out, or perhaps even the tensioner is playing up, thus random(ish) juddering. |
it would judder when cold then, but nothing untill lets say 60-70C |
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tadd
Audi Nut
Joined: Apr 23, 2012
Posts: 61
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Tue Mar 26, 2013 3:56 pm |
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yep, the problem was on the fuel pump electornics/actuator... all good now...
i also changed belt and tensioners and paid around 235 ponds with labor...
but now it has lower power on low revs, but alot more on 2k+
still need to check lines to wastegate actuator and wastegate itself... |
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tadd
Audi Nut
Joined: Apr 23, 2012
Posts: 61
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Wed Mar 27, 2013 6:21 pm |
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today i changed all vacuum hoses around vacuum pump leading to that thing that operates EGR... now i dont have any smoke... still have to go to BOSCH service so they fix fuel quantity, its very weak when its cold.. i'll keep you informed |
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SkyRocketeer
Camped on the site
Joined: Feb 14, 2011
Posts: 346
Location: Newport S-Wales
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Wed Mar 27, 2013 7:02 pm |
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Glad you're getting to the bottom of it - it's quite rewarding once you've finally found the source of the problem - regardless of how frustrating it was at the time. Please keep us informed. |
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tadd
Audi Nut
Joined: Apr 23, 2012
Posts: 61
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Wed Mar 27, 2013 7:14 pm |
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| SkyRocketeer wrote: | | Glad you're getting to the bottom of it - it's quite rewarding once you've finally found the source of the problem - regardless of how frustrating it was at the time. Please keep us informed. |
sure will
1 question... sometimes i lose turbo while cruising...
start with boost lines and actuator???
(edit: fixing vacuum hoses fixed stiff brake pedal in the morning) |
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tadd
Audi Nut
Joined: Apr 23, 2012
Posts: 61
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Sun Apr 07, 2013 7:07 pm |
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new problems...
still have judder on cruising, any speed or gear, nothing on full acceletarion or engine breaking...
morning start is good but engine idle is 650-700 and SLOW, but SLOW response on gas pedal for 1 min
it has very low power till it gets warm, and when it gets warm its not alot better
HUGE diesel leak from new actuator/electronic on bosch pump...
lost 10 liters in 100km
tomorow morning, BOSCH service again.. it buggs me alot when i have to go back to mechanic again and again for same thing...
keep you informed |
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HF1600ie
Needs to get out more
Joined: May 03, 2011
Posts: 119
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Sun Apr 07, 2013 9:31 pm |
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I know how you feel. I hate coming back for the same problem too. That´s why most of the things I fix myself.
Using vag.com would tell you how your pump timing is and how your fueling is.
My A6 shakes when I accelerate at +/- 1400rpm and let it stay there. At that RPM is ALWAYS shake a little. Not a fast shake, but more of a long-wave shake if you know what I mean ...
Don´t know why. I have new nozzles now and injectors were calibrated, still shakes. Big benefit was power, and a little more smoothness. |
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tadd
Audi Nut
Joined: Apr 23, 2012
Posts: 61
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Sun Apr 07, 2013 10:04 pm |
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| HF1600ie wrote: | I know how you feel. I hate coming back for the same problem too. That´s why most of the things I fix myself.
Using vag.com would tell you how your pump timing is and how your fueling is.
My A6 shakes when I accelerate at +/- 1400rpm and let it stay there. At that RPM is ALWAYS shake a little. Not a fast shake, but more of a long-wave shake if you know what I mean ...
Don´t know why. I have new nozzles now and injectors were calibrated, still shakes. Big benefit was power, and a little more smoothness. |
teell me all the things i need for vag.com please .. cables? etc... |
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HF1600ie
Needs to get out more
Joined: May 03, 2011
Posts: 119
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Mon Apr 08, 2013 11:54 am |
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Hi,
You need a program called vag-com. Version 311,2 is enough.
Then you need an USB OBD II cable (cable 1) and a 2x2 cable (cable 2).
Using this names you will find in sales sites what cables they are.
PC --> OBD II ---> 2x2 ---> ECU port (engine compartiment)
Hope this helps
| tadd wrote: | | HF1600ie wrote: | I know how you feel. I hate coming back for the same problem too. That´s why most of the things I fix myself.
Using vag.com would tell you how your pump timing is and how your fueling is.
My A6 shakes when I accelerate at +/- 1400rpm and let it stay there. At that RPM is ALWAYS shake a little. Not a fast shake, but more of a long-wave shake if you know what I mean ...
Don´t know why. I have new nozzles now and injectors were calibrated, still shakes. Big benefit was power, and a little more smoothness. |
teell me all the things i need for vag.com please .. cables? etc... |
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tadd
Audi Nut
Joined: Apr 23, 2012
Posts: 61
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Mon Apr 08, 2013 1:37 pm |
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vag com is not the problem, my friend has it... can you point me to good ebay obd and 2.2 cables?
| HF1600ie wrote: | Hi,
You need a program called vag-com. Version 311,2 is enough.
Then you need an USB OBD II cable (cable 1) and a 2x2 cable (cable 2).
Using this names you will find in sales sites what cables they are.
PC --> OBD II ---> 2x2 ---> ECU port (engine compartiment)
Hope this helps
| tadd wrote: | | HF1600ie wrote: | I know how you feel. I hate coming back for the same problem too. That´s why most of the things I fix myself.
Using vag.com would tell you how your pump timing is and how your fueling is.
My A6 shakes when I accelerate at +/- 1400rpm and let it stay there. At that RPM is ALWAYS shake a little. Not a fast shake, but more of a long-wave shake if you know what I mean ...
Don´t know why. I have new nozzles now and injectors were calibrated, still shakes. Big benefit was power, and a little more smoothness. |
teell me all the things i need for vag.com please .. cables? etc... |
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tadd
Audi Nut
Joined: Apr 23, 2012
Posts: 61
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Mon Apr 08, 2013 1:38 pm |
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vag com is not the problem, my friend has it... can you point me to good ebay obd2 and 2+2 cables?
what about this??
http://www.amazon.com/Soliport-Bluetooth-OBDII-Diagnostic-Scanner/dp/B004KL0I9I
will it work with 2+2 ?
| HF1600ie wrote: | Hi,
You need a program called vag-com. Version 311,2 is enough.
Then you need an USB OBD II cable (cable 1) and a 2x2 cable (cable 2).
Using this names you will find in sales sites what cables they are.
PC --> OBD II ---> 2x2 ---> ECU port (engine compartiment)
Hope this helps
| tadd wrote: | | HF1600ie wrote: | I know how you feel. I hate coming back for the same problem too. That´s why most of the things I fix myself.
Using vag.com would tell you how your pump timing is and how your fueling is.
My A6 shakes when I accelerate at +/- 1400rpm and let it stay there. At that RPM is ALWAYS shake a little. Not a fast shake, but more of a long-wave shake if you know what I mean ...
Don´t know why. I have new nozzles now and injectors were calibrated, still shakes. Big benefit was power, and a little more smoothness. |
teell me all the things i need for vag.com please .. cables? etc... |
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HF1600ie
Needs to get out more
Joined: May 03, 2011
Posts: 119
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| Posted:
Mon Apr 08, 2013 5:06 pm |
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daz-the-dogg
Camped on the site
Joined: Jul 26, 2011
Posts: 340
Location: Stevenage
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Tue Apr 09, 2013 12:31 am |
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tadd
Audi Nut
Joined: Apr 23, 2012
Posts: 61
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Wed Apr 10, 2013 12:57 am |
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what can faulty temperature sender 034919369C cause?? |
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tadd
Audi Nut
Joined: Apr 23, 2012
Posts: 61
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Thu Apr 11, 2013 2:07 pm |
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Is that 034919369C just fan switch or does it control gauge and engine fuel quantity? |
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tadd
Audi Nut
Joined: Apr 23, 2012
Posts: 61
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Fri Apr 12, 2013 10:34 am |
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GREAT NEWS ! 
After five days without a car being at BOSCH service I got a call to pick it up....
They changed actuator (again), because that new one they installed three weeks ago was bad, all the hoses from filter, pump and fuel return ones.
They said I have to clean the intake manifold because if severely blocked...
My AAT has alot of power again, some smoke on 1800-1900 boost rpm and then its stops. No more judder at idle or cruise. No more turbo kicking in at 2000+ rpm and it starts REALLY good when cold or warm. Now it gets to 90C alot faster, like it did before. No more hearing valves when cold and was no power. My opinion: they skipped a tooth on fuel pump belt and was too much in retard.
Thank you all for helping me. Hope this solves someone's problems.
Three more questions 
Is it possible to remove intake manifold from under the hood (upper side of the engine)?
Do I need new gaskets for intake manifold after removing it?
What do I have to watch over when cleaning intake manifold and engine head?
(sorry for my english)  |
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tadd
Audi Nut
Joined: Apr 23, 2012
Posts: 61
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Thu May 09, 2013 10:40 am |
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today, again... judder/missfire on idle, warmer it gets judders more...
called borch service again. he said he has 1 more electronics to swap and then he will refun if it wont fix the problem...
1 question, what does 046906283C solenoid valve does? |
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spink
Bandwidth Buster
Joined: Aug 12, 2006
Posts: 803
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Thu May 09, 2013 11:28 am |
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yes you can take inlet manifold off very easily,remove your airbox and all the bolts are easily accessible and come out easy.New gasket is only 2 or 3 pounds/euros so not worth reusing the old one. |
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