Question about Audi A4

1 Answer

Idle is rough (engine shakes at idle), and hissing sound from the secondary air injection combination valve.

Posted by on

  • lontennis1 Jul 31, 2009

    I have isolated the hissing sound to a spot under what appears to be a lid on the combination valve. When I place my finger over a certian spot on the valve, the hissing stops, however, the idle does not change. I would like to find a way to test this combination valve (perhaps you can help).



    LKS

  • lontennis1 Jul 31, 2009

    I have sent a reply with a further question on this same issue.

×

Ad

1 Answer

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

    President:

    An expert whose answer got voted for 500 times.

  • Master
  • 2,187 Answers

Vacuum problems, idling problems or the likes may cause the car to shake. This is because the combustion does not occur properly or the idling is wrong or both. You may want to check first the minor items such as vacuum hoses as they are cheap to replace which can be a source of the hissing sound.

Like you mentioned the secondary air injection can be the problem. You can inspect the actual valve. At times the gasket can be an issue but the gasket comes when you buy the valve as far as I know. Check also the solenoid if it is working properly. It may also cause the problem.

Posted on Jul 31, 2009

Ad

1 Suggested Answer

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi,
a 6ya expert can help you resolve that issue over the phone in a minute or two.
Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of.(from cars to computers, handyman, and even drones)
click here to download the app (for users in the US for now) and get all the help you need.
Goodluck!

Posted on Jan 02, 2017

Ad

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

1 Answer

My car shakes and hisses at idle, what's wrong??


if it goes when you put your foot down a little bit, then it sounds to me like idle speed control valve

Feb 25, 2012 | 2002 Chevrolet Impala

3 Answers

Car stalls at idle (sometimes), and often acts like it wants to stall at low speed after the engine has been running a long time or in a drive-thru. Symptoms are rough idle, dimming headlights, engine...


I believe you have 2 different problems here. P0410 is the secondary air injection, which only turns on when the engine is cold at first start up for about 20 seconds. All it does is blow extra air into the exhaust to reduce emmisions. There are 3 fuses and items that run this system: Check Valve ($125), Air Pump ($280) and Relay ($50). Prices came from Napa, so I'm possitive you'll find any of these much cheaper elsewhere. My guess is the relay since you have dimming.

Did you recently have the battery disconnected? Trying to address the stalling while at idle. If so, it's your throttle body, needs to be cleaned. If you want instructions on how to do this yourself, let me know, will only cost you about $4. I know the dealer charges about $85 to clean this where I live, which is outrageous! If you do have a shop do the work, make them remove the throttle body to clean it, don't just clean the outside of it.

Even if you don't do this work yourself, at least you know the lingo and shouldn't be surprised.

Good luck!

Jun 20, 2011 | 2004 GMC Envoy

1 Answer

96 eclipse non-turbo idles way too high, disconnect MAP sensor it goes down but then idles rough


Yes by disconneting the map sensor will drop idle and make run rough, the problem is the idle air control valve or a vacuum leak, try to clean the throtlebody with an old tooth brush and some throtlebody spray cleaner if that doesnt help then try having the iac valve checked the iac valve (Idle air control valve ) if with the engine running listen for a hissing noise that will be a vacuum leak, these are the most common reasons for higher than normal idle. hope this is helpful.

Dec 05, 2010 | 1996 Mitsubishi Eclipse

3 Answers

U i have a 97 ford escort that idles rough so i replaced the wires and plugs it still idles rough but runs a little better the coil shows spark on all cylinders any ideas


Often, on the Escorts of this vintage, rough idle can be due to a leak in the vacuum system. With the engine running, listen closely for any tell-tale hissing sounds coming from any of the vacuum hoses. Check that they are all securely in place and the end-clamps are all tight. Also check that the PCV valve and the hose connecting it to the manifold are securely in place. Another possibility is the Idle Air Control (IAC) valve. If it is clogged or sticking, it can cause rough idle. Refer to a service manual to diagnose the IAC valve. Other things to check: make sure that the air intake is unobstructed and clean. You might consider cleaning the manifold and throttle body. Check the air filter and replace if necessary. Let me know if you have any other questions.

Apr 02, 2010 | 1997 Ford Escort

1 Answer

Audi missing at idle, engine smoke, and vacuum leak


audi oil leaks are usually valve cover gaskets. oil run off causes smoke on exhaust downpipes.while vacuum hoses do tend to dry rot with time it may also be the secondary air injection pump (if cold ) or waste gate for turbo.try to use a long hose,put one end on your ear use the other to locate sound. extending mirror and light may help too. missing at idle could mean time for tune up or coil pack failing. good luck

Mar 23, 2010 | 2004 Audi A4

2 Answers

I have a 325bmwxi that is idleing roughin drive


bmw should NOT SHAKE THE STEERING WHEEL AT ADLE. OK SOUNDS LIKE ITS RUFF UNDER LOAD LIFT THE HOOD AND CHECK FOR A HISSING SOUND IF SO IT IS VACUUM LEAK. MOST COMMON. iF TAHAT ISNT IT LETS MAKE SURE ITS IDLEING AT 800 RPM IF HIGHER PLEASE PUT ON FORM HERE AT FIX YA AND WE CAN WORK THIS OUT CHECK IDLE, CHECK ENGINE LIGHT, AND THEY ARE BAD AT NEEDING MOTOR AND TRANS MOUNTS MY BET WOULD BE ON MOUNTS

Feb 12, 2010 | 2004 BMW 3 Series

1 Answer

Check engine light comes on every three weeks about.reads secondary injection air system. can you help?


With regards to the secondary Air Injection system, this is basically an inspect and replace broken hose detail.
Leave the inlet hose disconnected and start the engine. Listen and feel for exhaust hissing at the check valves.The check valve(s) will make like a gurgling sound as air is drawn in However , if exhaust is felt or heard replace the valve. Get a scanner and turn off the check engine light. Hope this works out for ya.

Jan 02, 2010 | 2001 Volkswagen new Passat

1 Answer

1999 nissan frontier is idling rough the truck shakes but shaking stops when the air is turned on. changed oil, spark plugs, spark plug wires and distributor cap.


This can be your Idle control valve, when you turn the air on it puts the engine under load and your computer will increase the idle automatically to prevent the engine from cutting out.
When you are standing still and the car is shaking, by touching the accelerator very softly does the shaking stop? If so check the idle control valve.
I hope this will help.
Regards
Sam

May 13, 2009 | 1999 Nissan Frontier

1 Answer

Engine shaking when idle


find the vacuum line by listening to the hiss and following it then replace the hose and if it fixes your rough idle that is what it was

Apr 05, 2009 | 2004 Ford Explorer

Not finding what you are looking for?
Cars & Trucks Logo

Related Topics:

169 people viewed this question

Ask a Question

Usually answered in minutes!

Top Audi Experts

Colin Stickland
Colin Stickland

Level 3 Expert

22219 Answers

yadayada
yadayada

Level 3 Expert

76649 Answers

Thomas Perkins
Thomas Perkins

Level 3 Expert

14380 Answers

Are you an Audi Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...