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Rough idle, scanner says multi cylinder misfire and vac at ign fail

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  • Anonymous Mar 23, 2014

    intermitant rough idle and misfire code

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The Misfire is your Rough Idle check Coil Pecks & Spark Plug Wires

Posted on Dec 09, 2009

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Misfire cylinder 5 on a 2006 town & country 3.8. also rough idle, and driver side rattles at different speeds.


rough idle symptom of misfire --need to diagnose if plug wires/coil failing injector etc ---noise can be anything from debris to failing suspension part need to jack up and inspect

Jun 07, 2018 | 2006 Chrysler Town and Country

1 Answer

Multiple misfire code


Hi
rough erratic idle, stalls, loss of power, multi cylinders misfire.
1: you have to check the timing belt for correct timing.
2: if timing is OK check the EGR valve, could be stuck open.
3: check for vacuum leak
Good Luck

Apr 21, 2014 | Cars & Trucks

1 Answer

02 passat rough idle cylinder misfires 1-3


did it misfire before the tune up? if not more than likely the firing order is wrong the wires we're put back onto the plugs incorrectly check the order other things that can cause this are fuel or even a vac. leak

Aug 27, 2012 | Volkswagen Passat Cars & Trucks

1 Answer

OBDII code P0306 describes misfire # 6 cyl or ign misfire, wires are new, coils (3) are new, rough idle on acceleration possible bad fuel injector or ???


I noticed that you didn' t mention the plugs. I'll assume that if you did wires and coils that plugs are also new, so I would say that you need to check the injector on that cylinder

Jan 07, 2011 | 1996 Pontiac Bonneville SE CA Value

1 Answer

Engine light on... the engine gets bad gas mileage and runs very rough at idol... troubleshooting code P0301. Autozone says: misfire, fault sparkplugs, wires, and more... CAN YOU HELP?


Cylinder #1 Misfire.
What experience you have, and how you approach this, is up to you.

Plugs don't fail
You don't throw wires at these things
You Diagnose the cause and repair.

If you got COP Ign Coils --go there for #1

Oct 12, 2010 | 2004 Dodge Ram 1500

1 Answer

Idles rough. when under load, it sputters like a cylinder is misfiring. no smoke or leaks. any idea?


well. if it idles rough without a load and then worse with a load i would try changing spark plugs and ign. wires. also try pulling out your idle air control valve and clean it out. if that doesnt work look up testing for your throttle position sensor. check for worn vacuum lines and check for vacuum leaks. if it runs rough throughout driving it will be ign. or fuel delivery. get some injector cleaner and throw it in your tank. if non of this works then your in the same spot as me bud. oh and check your camshaft position and crankshaft position sensor and also your speed sensor.
good luck to ya bra

Jul 06, 2010 | 2006 Volkswagen Jetta

1 Answer

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.

"Lean misfire" can occur when the air/fuel mixture is too lean (not enough gasoline in the mixture) to burn. This can be caused by a dirty, clogged or inoperative fuel injector; air leaks; or low fuel pressure because of a weak pump, restricted filter or leaky pressure regulator. Low fuel pressure would affect all cylinders rather than an individual cylinder, as would most air leaks. A leaky EGR valve can also have the same effect as an air leak.

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.

Hope this help.

Mar 25, 2010 | 1989 GMC Sierra

1 Answer

05 taurus rough idle when cold then runs fine. code P0308 was pulled. No other issues, car runs great beside that. I know 308 means multi cylinder cross fire. So it has to be something common to all...


it cant be cross fire it is misfire, cross fire ocurs in engines that use a distributor, the code is from one or more cylinders misfiring check for a bad set of cables or a faulty spark plug or coil

Dec 17, 2009 | 2005 Ford Taurus

1 Answer

2000 Focus Zetec-rough idle, very rough under load.


you haven't said if its petrol or diesel so i'm assuming its petrol since your smelling sulfur sounds if you have a misfire causes could be plugs,leads or ign coil i suspect its ign coil these are common to go.

Mar 25, 2009 | 2000 Ford Focus

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