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Audi 1.8t back pressure out exhaust rough idle

Audi A4 1.8t car runs idled at about 800-1000 really rough idle. Has a lot of back pressure coming out of the exhaust. Any ideas? Or any questions you may have to help me figure out what's wrong with it? Please feel free to respond. Thank you.

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  • Contributor
  • 26 Answers

There is misfire to the engine.. Misfiring means, bad spark Plugs or there is ignition coil is not working well

Posted on Dec 28, 2013

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6 Suggested Answers

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  • 2 Answers

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Posted on Jan 02, 2017

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  • 345 Answers

SOURCE: 1997 Audi A4 B5 fuel pump

what makes you think its the fuel pump.......explain your problems (codes if you have any)and i might be able to help you......please give a good description of your fault please

Posted on Nov 11, 2008

  • 6 Answers

SOURCE: no acceleration,audi 1.8t,runs like no boost

have you tried cleaning out the throttle body as i had a similar problem and this worked

Posted on Nov 29, 2008

j_del
  • 1586 Answers

SOURCE: no acceleration,audi 1.8t,runs like no boost

It's possible that the diverter valve (DV) has failed. The OEM valve has a plastic diaphragm inside and it can crack. If this happens, the car will leak boost air and will lose power as a result. Go to www.audiworld.com, click on Resources, then Tech, and then go to the engine article about replacing/upgrading the diverter valve - it'll show you where it is and how to do it.

Posted on Mar 27, 2009

cknn18
  • 8 Answers

SOURCE: audi a4 2.8 quattro idle valve

there is no carburetor on these cars , the idle air control valve is an easy thing to change it is on the passenger side near the firewall on the back of the engine buy the new one so you know what it looks like it has a wire connector on top 2 bolts and a gasket behind it just unhook it unbolt it remove the old gasket install the new one with the new gasket and plug it in simple there is no sealer required

Posted on May 09, 2009

txkjun
  • 409 Answers

SOURCE: A4 2.0 TDI. Rough idle

You could have a bad air flow sensor. Do you also have a lack of power??

Posted on May 13, 2009

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My car is over revving going to 1000 rpm at idle what is it please help Audi A3 s line 2.0 tdi


Revving on Idle ' Audi-Sport.net

www.audi-sport.net > ... > A3/S3/Sportback (8P Chassis)
Feb 1, 2012 - My Car 58 S3, as of last night decided to start revving whilst on idle, I found a clip ... I can do or is it going to be a trip to audi for them to pull my pants down! ... Lots of members all over the UK have VCDS, have a look at the VCDS .....and as the engine warms up it'll auto-rev to 1000rpm every time i sit at idle. Car revving itself on idle ?
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Whining noise when accelerating, any ideas?
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[FIXED] Audi A4 RPM Idle Problem - YouTube

? 2:48
https://www.youtube.com/watch?v=EG71Jz9l6qY
Feb 5, 2011 - Uploaded by RickyTomatoes
[FIXED] Audi A4 RPM Idle Problem .... whole lot more and sometime i can even feel like the engine is just gonna die. sometimes it does it some other times it does ... Our cars shouldidle at 900. ... AUDI A3 1.6 IDLE PROBLEM!

When getting into first gear, is revving to 2000 RPMs before ...

https://www.reddit.com/.../cars/.../when_getting_into_first_gear_is...

RedditSep 3, 2014 - When getting into first gear, I bring the revs up to around 2000 RPM right ... Being able to get going without any throttle is fairly dependent on car size and ...Thats how I have a 300,000 kay clutch still on my audi with no slippage. ... Clutches ought to last well over 100,000 miles if they are not abused, and ...

Revs going up and down while car is stationary - AudiForums.com

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Jan 21, 2016 | Cars & Trucks

1 Answer

A year ago my 2008 Audi a4 developed a rough idle and loud engine no check engine light call my dealer they performed fuel pressure switch recall intake manifold secondary throttle body recall two months...


what A4, lots made.
see here for list
http://en.wikipedia.org/wiki/Audi_A4#A4_TDI_concept_e_.282008.29

it's a complex car, all are ofter 2007 and for sure Turbo's
as such can be very hard to work on , and diagnose.
noise and rough idle.
noise is a hands on deal, no net bunny here can guess. that.
but rough idle
that is called misfire.
if a diesel misfires , we check compression first.
the injection rates.
some times just looking at live SCAN data you can see a problem.
my advice find a good German mechanic.
no country stated, making all answer near useless. (oh shock of that)
in my shop i can see you, the car, and the tavern across the street
called Nunavut nook.
a clue. there.huh?
in USA Audio or any ASE certified shop.
or if USA< try alldata dot com.

Oct 12, 2013 | Cars & Trucks

2 Answers

Oil pressure light went on on my 2000 audi a4 1,8t. What should i do?


could be sender or pump. do not run the engine until you're sure you have a good pump. Does it blink on and off--coming on mainly at idle? This would be normal for an old engine. If it stays on and the pump is bad, you will ruin your engine. You can try replacing the sending uniot, as that is cheap compared to the pump, but don't run it long to check new sender. If new sender stays red, shut down and replace pump.

Sep 03, 2010 | 2000 Audi A4

2 Answers

Audi 1999 a4 runs rough idles up and down


I think the fuel has gone bad. it's cloging the injector ports. Try this first remove all fuel from the tank, replace the fuel filter. add 5 gallons of fuel and one bottle of fuel treatment. Run the engine for an hour
this will allow all of varnish from the bad fuel to disolve and clean the injectors. Don't be suprised
if this doesn't totally elimnate the problem chances are the plugs are fouled and need to be replaced also. Good luck
Hope this helps
Please leave feedback

Nov 29, 2009 | 1999 Audi A4

1 Answer

2007 Audi A4 Quattro 2.0T Idle Vibrations


mcdevito75 here, A vibration while idleing is not really normal, a rough idle could be many things, wrong octane gas, dirty gas filter, dirty smog controls. Have your local shop take a look for you.

Oct 20, 2009 | 2007 Audi A4 Convertible

2 Answers

My 2004 Audi A4 1.8T just started running rough. At idle it cutting out and wont go over 20mph. Had the timing belt replaced 20,000 miles ago. Any ideas?


check the catylitic convertor, it may be rstricted disconect the exhaust down pipe from manifold and strat engine, if the problem goes, replace the unit.

Oct 02, 2009 | 2001 Audi A4

2 Answers

Vibrations While Idle and smoke issue!


2002 a4 try fuel cleaner first, see how that goes after driveing for a while,,,the same goes for the 200 a4,, then we work from there

Aug 12, 2009 | 2004 Audi A4

1 Answer

A4 2.0 TDI. Rough idle


You could have a bad air flow sensor. Do you also have a lack of power??

May 13, 2009 | 2005 Audi A4

2 Answers

99 A4 has very little power above 3K and idle bounces & rattles


sounds like a clogged exhaust system , from the outside of the car does the rattle sound like it is coming from the convertor or muffler? if so run an exhaust system back pressure test via a oxygen sensor port or drop the exhaust and run car with open exhaust and see if the power comes back. doing this will likely set a dtc so be prepared to clear codes after test.

Mar 24, 2009 | 1999 Audi A4

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