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2006 bmw x5 3.0i rough idle and loss of power like it's running on just a few cylinders. Only happens in the morning. It starts up fine and smooth drives fine for a few miles till I stop and these symptoms start. It eventually goes away after driving it a few more miles and never happens again the the rest of the day. I've checked the disa cleaned the icv and maf. The service engine light is as well. Though it's been a slow progression up to this point first it was the service engine light and noticed a slight stumble at idle which would go away along with the light. But would come back on again along with the stumble but now light is always on along with this morning time problem

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  • 17 Answers

PROBABLY NEEDS A TUNE UP AND NEW VALVE COVER GASKETS, SOUNDS LIKE OIL IS LEAKING INTO THE SPARK PLUG TUBES AND CAUSING THE MISFIRE

Posted on May 08, 2014

  • rodney May 08, 2014

    Why does it only happen in the morning and not all day?

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6 Suggested Answers

6ya6ya
  • 2 Answers

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

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Posted on Jan 02, 2017

  • 15 Answers

SOURCE: V6 engine idles rough after restarting, then smooths out

My first guess would be a dirty carb/fuel injector set. Run some fuel cleaner through the tank and see if it gets better. You might have to do it through a couple of tanksful. How long since you've had a tune-up? It might just be that time.

Posted on Nov 15, 2008

emissionwiz
  • 74945 Answers

SOURCE: My 1996 Buick Roadmaster LTD engine intermittently stalls.

U DON'T HAVE A CARBURETOR SO FORGET THAT, THE FUEL REGULATOR WOULD NOT CAUSE THIS PROBLEM. I AM A GM FACTORY TECH AND KNOW THIS WITH CERTAINTY. U COULD HAVE SLUDGE IN THE IDLE SPEED CONTROL AIRBYPASS VALVE.

Posted on May 06, 2009

  • 1 Answer

SOURCE: Car stumbles,hesitates,loses power on Hwy, randomly

Did you check earth connection of electric system?

Posted on May 10, 2009

  • 9 Answers

SOURCE: 2001 LINCOLN LS V6 - ROUGH IDLE / SOMETIMES STALLING.

Very common problem is about a dime size hole wearing in the rubber elbow on the PCV valve located on the driver side rear of the intake manifold.

Posted on Oct 13, 2009

ourhowse
  • 2007 Answers

SOURCE: Will not run smoothly when engine warm unless MAF

I would guess you pretty well havew it figured out. Change the MAF sensor.

Posted on Dec 24, 2009

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I am having ongoing problems with the truck miss firing and rough running. Timing is ok, replaced cap and rotor,coil. It still starts rough,idles rough and misses when at cruising speed,although it seems...


Misfire is a common driveability problem that may or may not be easy to diagnose, depending on the cause. A misfiring cylinder in a four-cylinder engine is, pardon the pun, hard to miss. The loss of 25% of the engine's power output is the equivalent of a horse trying to run on three legs. The engine may shake so badly at idle that it causes vibrations that can be felt in the steering wheel and throughout the vehicle. The engine also may be hard to start and may even stall at idle, depending on the accessory load (air conditioning, headlights and electric rear defroster, for example).

When misfire occurs, performance suffers along with fuel economy, emissions and idle quality. And, when a misfiring vehicle is subjected to an emissions test, it will usually fail because of the unusually high levels of hydrocarbons (HC) in the exhaust.

What causes a cylinder to misfire? Basically, it's one of three things: loss of spark; the air/fuel mixture is too far out of balance to ignite; or loss of compression. Loss of spark includes anything that prevents coil voltage from jumping the electrode gap at the end of the spark plug. Causes include worn, fouled or damaged spark plugs, bad spark plug wires or even a cracked distributor cap. A weak coil or excessive rotor gas inside a distributor would affect all cylinders, not just a single cylinder.

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Loss of compression means the cylinder loses most of its air/fuel mixture before it can be ignited. The most likely causes here are a leaky (burned) exhaust valve or a blown head gasket. If two adjacent cylinders are misfiring, it's likely the head gasket between them has failed. Also, if an engine is overheating or losing coolant, it's likely the head gasket is the culprit.

Intermittent misfires are the worst kind to diagnose because the misfire comes and goes depending on engine load or operating conditions. They seem to occur for no apparent reason. The engine may only misfire and run rough when cold but then smooth out as it warms up. Or, it may start and idle fine but then misfire or hesitate when it comes under load. Also, it may run fine most of the time but suddenly misfire or cut out for no apparent reason. Intermittent misfires can be a real challenge to diagnose, so let's start with a steady misfire in one cylinder before moving on to intermittent misfires.

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