Question about 2005 Audi S4

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Rough idle,misfire cilinder 1.and the mechanic said that is something wrong inside the engine because he checked everything. coil,spark plug, fuel injector, and nothing.probably the pistons or valve something like that.any suggestion please.audi s4 b6 2004

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The information you give is to vague for a problem of this magnatude.;;;??im going to ask you to try a few things before we take a jugement;;;?is the air elemant ok.;;has the mechanic rulled out fuel injector/s;;;?an vacuum leak at throttle body,inlet manafold or associated hoses.i honstly dont believe this is an power unit problem ;;the first thing im going to ask to do is run a can of fuel cleaner through the system .;;;for about 150kms .if the problem persists get a cyclinder pressure test this will detemine the true problem.hope this helps please let me know as im very interested in this case.yours .adrian

Posted on Feb 19, 2009

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Volkswagen has similar problem , turned out to be intake air sensor near air filter box has 4 or 5 wires on the connector , but check with dealer for recall on this problem before you shell out any more $

Posted on Feb 19, 2009

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1 Answer

How do I fix a multiple misfire with a rough idle and auto transmission that shifts rough. I have an obd 2 trouble code PO300?


need to find out why the misfire bad coil ,wire ,wrong plug gap etc check injectors and fuel presure --what ever is causing misfire is also probably causing problems with transmission shifting

Oct 16, 2016 | Cars & Trucks

1 Answer

How do I fix cod po301


Hello Carlos,
It is a common problem with '99 Cady (Random Misfire Detected)
  • Start the car and carefully pull the plugs boot out one by one, and put it right back (a few seconds is enough).
  • Take Notice of of which one is affecting the RPM of the engine ( slowing down and and shaking erratically).
  • With the engine Off.
  • Use the appropriate socket and again one by one take out the spark plugs and check them for oil and heavy residue build up.
  • If there is Oil in anyone of plugs, take the car to mechanic and let him or her do an evaluation or diagnostic.
  • You probably need new coil packs and spark plugs.
  • Change the oil and the air filter too, if they are dirty.
  • Check also the fuel filter.
  • If the code does not go away by itself, have it reset by a mechanic.
Best of Luck,
JP

Jun 28, 2015 | 1999 Cadillac Catera

2 Answers

Still having problems will not run good. 1997 ford 2.0 escort;new plugs&wires coil;fuel pump still codes 0351;


From a reputable repair website:


P0351 - OBD-II Trouble Code

Auto Systems and Repair

Ignition Coil "A" Circuit Primary/Secondary Malfunction Our emissions expert has put together the following information about the P0351 fault code. We have also included diagnostic procedures you can take to your repair shop if the mechanic is having difficulty analyzing the code.
OBD II Fault Code
  • OBD II P0351 Ignition Coil "A" Circuit Primary/Secondary Malfunction
What does this mean? The ignition coil or coils are responsible for igniting the air/fuel mixture inside the combustion chambers. Without reliable performance from the ignition coil(s) the vehicle will stumble and misfire.
Code P0351 indicates there's an electrical problem in either the primary ( the computer side ) or the secondary ( the spark plug side ) of the Ignition Coil "A" Circuit.
Symptoms
  • Check Engine Light will illuminate
  • Engine idles rough
  • Engine misfires on acceleration
  • In rare cases, the engine may not exhibit noticeable symptoms
Common Problems That Trigger the P0351 Code
  • Defective Ignition Coil(s)
  • Defective Spark Plug(s)
  • Intake Manifold Vacuum leaks
  • Carbon buildup in the Throttle Body air passages
  • Defective Idle Air Control Valve or Electronic Body
Common Misdiagnosis
  • Ignition coil(s) replaced when cause of the malfunction was a vacuum leak
  • Spark Plugs replaced when cause of the malfunction was a vacuum leak

Dec 21, 2014 | Ford Cars & Trucks

1 Answer

00 honda passport intermittent rough idle


called misfire.
that means its not holding closed loop status at idle
ever do a tune up on it?
old spark plugs dont work, they MISFIRE and idle fails.
all cars for 100 years ,same , gas engines.

it can also be, bad fueling. or a bad engine.
we check compression first
then spark then fueling;
in that order, engine can not run right out of that order.
so misfire.
too rich misfire.
or too lean.
we check that by gazing at the spark plug tips ,
black is rich, white is lean.
most cars are cream or very light tan color. normal.
learn to read the spark plug tips.

its and 2000, and the scan tool will show the car is not i closed loop
at idle, fix that first. and DTC errors like MISFIRE P0300 or bad idle.
the same scan too show LTFT, long term fuel trim.
if its way far from 0 , the fueling is wrong.
-3-5% is normal. -50 is stuck rich and misfiring.

Jun 07, 2014 | Cars & Trucks

1 Answer

Chevy check engine light


Yes,spark plugs,wire,coils,fuel filter,TPS rough idle,You lackey have all.My car run kind of fanny no light hard to say what wrong.

May 03, 2013 | 2004 Suzuki Verona

1 Answer

Engine runs rough at idle and bucks at highway speed. Check engine light was on after fuel injector cleaner was added to gas, the chek engine light ent off.Scan tool indicated no. 1 cylinder misfire prior...


I had a similar problem in a 1994 Taurus, and after spending nearly 300$ on ignition parts, it turns out the problem was a bad spark plug wire that cost me 8.88$ to replace.

Mar 01, 2010 | 2001 Ford Taurus

1 Answer

Rough idle. rpms drop. misfire.


try your coil packs they go over your sparks or do plugs first and see what happens do affordable first

Feb 01, 2010 | 2002 Cadillac Deville

1 Answer

1999 Town Car began running very rough - suddenly.


When cleaning your engine, water/degreaser went down the spark plug ports. Try using a air compressor blow gun to remove the moisture from around the spark plugs and boots. The water was causing the engine to misfire on 3 cylinders at first and as the ports started to evaporate the moisture, the less misfiring was occuring. Dry thouroughly and hopefully coils do not have damage to them. Also check to make sure the boot is making good contact with the spark plug.

Mar 23, 2009 | 1999 Lincoln Town Car

1 Answer

Check engine light on. 4 cylinder. Light flashes on acceleration. Sometimes idles rough. Computer scan reads random misfire and #2 & #3 misfiring. Added fuel injector cleaner but no help yet. Cleared...


There are three kinds of gasoline engine misfire scenarios, first there is the "under load" misfire and there is the "at engine idle" misfire, and finally there is misfire continuously. All engine misfires exist because one of three things has occurred. First, a cylinder has lost compression, a cylinder needs a certain amount of compression to operate correctly. Second, the ignition system has failed or is failing intermittently, spark is needed at the time of compression to ignite the fuel air mixture. Third, the fuel air mixture is incorrect, proper mixture is needed for the ignition system to ignite fuel properly. If any of these conditions occur in the engine, the engine will misfire.
1. Low or no compression can be caused by

a. burned or leaking intake or exhaust valves
b. worn or broken piston or piston rings
c. worn out camshaft
d. wrong weight motor oil was installed holding the cam followers from adjusting
e. broken valve spring
f. failed head gasket.
2. Ignition system has failed or is failing
a. spark plug has fouled or is worn out
b. ignition coil
has failed
c. spark plug wires have shorted
e. engine control module coil driver has failed
3. Fuel/Air Mixture is incorrect
a. vacuum leak at the intake manifold
b. fuel injector has failed
c. EGR valve is stuck open
d. mass air flow sensor has failed
e. oxygen sensor has failed
f. air intake boot is cracked

common problems:
1. fuel injector has failed or is failing
2. spark plug wire has shorted
3. spark plug is worn out or is cracked
4. ignition coil has failed is failing

Testing a coil on the car is pretty easy. No special tools are required. Just remember to be careful, the amount of electricity generated by your ignition system can be dangerous. If your coil is already off the car, or if you would like a more specific data-driven test, you can bench test your coil. To set up the test, remove one spark plug wire from its plug, then remove the spark plug using a spark plug socket. Next put the spark plug back into the spark plug wire. Be careful not to let anything drop into the empty spark plug hole -- very bad.

Dec 07, 2008 | 1999 Toyota Camry

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