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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 later my waste gate actuator rod broke after repairing rod car ran fine for 7 months now why would engine noise and rough idle are back car still has eight pounds of stock boost mass air flow good fuel pressure good no air leaks air fuel ratio good sounds like a plug the exhaust checked catalytic converter wafers look good I have no idea no check engine light still

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  • Cars & Trucks Master
  • 20,706 Answers

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.

Posted on Oct 12, 2013

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Posted on Jan 02, 2017

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  • 9 Answers

SOURCE: Check engine light

Funny that they changed the temp guage sensor....known problem on pre-2001 Audi TT and VW engines. Maybe yours was an early build 2002, so they helped you avoid a future problem.
As for the air flow, another known problem is the MAF (mass airflow) sensor. Don't panic, as this is a do it yourself job. Very likely problem if you ever installed a K&N type aftermarket air filter. These oiled filters cause buildup on the sensor. Free fix is to take the sensor body off (its the big ring/pipe coming off the air filter box before the rubber air intake hose) and clean the senor with isopropyl alcohol. Sensor body comes off by loosening the hose clamp on one end, and two screws into the filter box on the other. Don't forget to release the wiring harness plug by gently releasing the tab with a flat head screwdriver.
If your not comfortable with the cleaning, just find the MAF part on-line...about $200 bucks for a new one from Bosch. Very easy to do it yourself and a common failure point on the Audi.
For those still having the coolant sensor problem, also easy to replace yourself....about $10 bucks with a new o-ring.
Like GURU said, a code reader tool will tell if you have these problems, after the engine light comes on.

Posted on Jul 03, 2009

SOURCE: 1999 pontiac grand prix . will not run

If wiggling the wires cured the code, then one of the wires is broken inside the insulation. Pull on each wire one at a time. look for the colored insulation to stretch, this will be the broken wire. For the other car that wont rev up, this is a common when the catalytic concverter is plugged up. This will also cause MAF codes, and in turn, TRAC OFF light.
See http://www.greatautohelp.com

Posted on Oct 17, 2008

  • 3 Answers

SOURCE: 1989 Cavalier Z24 Stalling problem

Have you heard of Noid lights? You unplug the fuel injector and plug these in and they will light up if the injector is getting power. This might give you a better hint. There are also lights that go inbetween the spark plug and wire. Between these two items you may be able to narrow down the problem to a specific system. I believe that your car has a coil pack. Some of these engines have problems with the crank trigger. I believe it is located on the back side of the motor. If you decide to change it, be careful. I have heard of them breaking into two pieces and becoming a big problem.

Posted on Jul 21, 2009

wracefans24
  • 1985 Answers

SOURCE: I have a 2005 Chrysler Town & Country with

there are no codes that say replace O2 sensors,or remove converter,Thats just somebody's guessing,When it says O2 sensor that tells the mechanic to look for trouble in that area,wiring or faulty readings,And there are four O2 sensors.

Posted on Jan 20, 2010

  • 1243 Answers

SOURCE: 2003 envoy smells like fumes and idles rough

have you checked for a vacuum leak?pcv attached,no leaks around plenum,engine coolant temp sensor reading right.

Posted on May 31, 2012

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carsandcomps,

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Hi there again

Sorry to hear you are still having problems.If you are going to change the pump I would certainly not recommend you do it yourself.If it is the V4 motor I am thinking of, you would need to get to it by removing the rear seat ,remove access panel , and pretty much play around in the gas for an hour or so to get it off in the first place.

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