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Misfire under load. Its sems like electrical is cutting out

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Check plugs and ht leads. check coils for correct operation.

Posted on May 05, 2013

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Swapping coils between cylinders is a better solution than replacing them. This way if the misfire follows the coil you know the coil is bad. Lack of power under load usually suggest fuel starvation to me. I would change the fuel filter and then road test the car. Also if you had just filled up the tank when the misfires started, maybe you got a bad tank of gas. Sometimes right after a rain water gets churned up and gets into the pump, and consequently your fuel tank.

Dec 23, 2011 | Cars & Trucks

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Hi I have a 1974 hillman avenger 1600. It misses when cruising at around 100km/h, particuarly giong uphill. I think its because the valve on no1 cylinder tightens up, as I have altered the clearance in...


Misfire when going up hill or under load is more likely to be a plug or plug lead. Valve clearances only change slightly when hot but not under load so if it only misfires going up hill its likely to be electrical or fuel starvation, check the fuel filter also

Aug 29, 2010 | Chrysler Town & Country Cars & Trucks

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

Hi, I have a 04 Escape,Check engine light is not on but it sputter and cuts off when i hit the gas in i have done a tuneup on it


Sounds like ignition misfire. Inspect the plug wires for signs of arcing. Or apply a water mist to them when the engine is warm and idling in gear. It will miss under load.

Feb 24, 2010 | 2004 Ford Escape

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1991 Buick LeSabre 3.8L misfire


Plug wires! If it miss fires under a load it's usually an ignition problem. Check the plugs and replace if necessary and replace the plug wires.

Feb 06, 2010 | 1991 Buick LeSabre

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