Question about 2004 Suzuki VS 1400 Intruder

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Front cylinder is backfireing when it warms up. thought it was spark plugs so i changed them around and still had same problem. figured maybe wires? carb? or something. was gonna change the wires around on the coil but dont exactly want to tear into it to much

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No, backfiring is almost always the mixture, not the plug and probably not the wires unless they are getting crossed. I would assume that in this case it is probably from the mixture being too rich. I would say the choke may be staying on too long.

Posted on Sep 09, 2010


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97 acura 2.2 cl engine light p0302 code

A P0302 is indicating that cylinder # 2 is misfiring...Cylinder # 2 is the second plug counting from the front to rear of engine...Main causes for misfire are: defective spark plug, spark plug wire...When was last time plugs were changed? if it has been awhile I would suggest changing them...Also the spark plug wires should be replaced...Changing one plug and/or one wire isn't a good idea; change them all...Plugs cost two or three dollars apiece and a set of wires around $15...Standard motor products wire set # 4717...Spark plugs; Bosch platinum gaped at .044

Nov 13, 2015 | Acura Cars & Trucks

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Backfires after running and stops, must shut off to stop the backfireing. I have replaced the fuel filter, and checked the gas cap vent,what else could cause the backfire?

For a more specific answer, you should post the applicable elements of Make/Model/Year/Engine Model/Transmission Model/Deck Size, and hours on meter if you have one. A short description of the events preceding the beginning of the problem is also helpful.

Several possibilities for small engine backfire:
  1. Needs new plugs. Start with new plugs.
  2. Shear pin under flywheel is slightly damaged throwing off the timing. Remove flywheel examine shear pin for any damage. Just go ahead and replace it; if it even looks nicked or sliced.
  3. Coil, or spark plug wire, is going bad. Inside the Coil are two windings of wire and no moving parts. With shorted (melted together inside) windings you can still get a spark, but it will be weak. With open (burnt/broken) windings, you get no spark at all. There are also electronic components like diodes which may be failing. Coils are subjected to heat and vibration and do fail on occasion. Another coil consideration is the spark plug wire. Back in the day, we would replace all our spark plug wires when we gave our car a tune up; because spark plug wires do fail. The only way to replace the spark plug wire on a mower is to replace the Ignition Coil.

    Note: Coils may not fail completely at first. They can be complicit in the situation where a mower starts and runs for a while.They may cause backfire. As it heats up the coil parts expand and cause the engine to shut down. It does not re-start until the machine has cooled enough to allow the coil to cool. This can be 30 minute to several hours; perhaps it starts again the next day only to repeat the failure.

    Short of a well running engine, with no special equipment, the only field-test for a coil and the spark plug wire output is to visually assess the color of the spark at the end of the spark plug. Alternatively, you may use a spark tester. A spark tester gauges the strength of spark by making it jump a bigger gap. This test calls for a gap in the range of 4.2 mm (0.166 in). It's important to note that setting a test gap beyond 5.0 mm (0.200) could damage the ignition components. Briggs and Stratton manuals, for the newer engines, specifically state that you should not test for spark with the spark plug out. I do not know why this is. They specify you should use a spark tester.

    B&S notwithstanding (at your own risk), with a new plug attached to the plug wire hold the threaded part against a ground point or wrap some bare copper wire around the threads and fasten the wire to the engine frame or other good ground. Make your shop or garage dark so you can see the spark easily, then crank the engine. The flywheel must spin rapidly (at least 350 RPM). The strength of the spark is revealed in the color. A red or yellow spark is weak and probably will not spark in the cylinder. A blue or white spark is strong and has enough voltage to fight across the spark plug gap even under pressure within the cylinder.
    Note: a good strong spark also makes a strong snapping noise as it fires.
  4. Needs a valve adjustment or a valve job. This is high on the list of the most common reasons for backfire. Start with adjustment.
  5. The other thing that causes backfire is fuel mixture too lean. On a small engine this is not usually an adjustment problem. It may be the fuel system/carburetor is dirty or partially clogged. It may also be an air leak in the gaskets of the intake manifold. It might be low fuel pressure from a bad pump or clogged fuel lines.The electronic fuel shut off valve may be malfunctioning. If nothing else solves the backfire, check fuel flow through the pump and lines, remove the carburetor and clean or rebuild it. This is the least likely of the options so save it for last.
Here is a link to a great essay on magnetos and spark plugs.
Village Science Magneto Spark Plugs

For Twin Cylinder Engines
A power balance, or cylinder balance, test should be run on a twin cylinder engine. If compression is good and cylinder leakage is minimal (in other words if the engine is not worn out, doesn't have too many hours), but a cylinder is misfiring or shows up weak in a power balance test, it indicates a fuel delivery or ignition problem (fouled spark plug or bad plug wire).

If an engine is hard starting, runs rough, misses or lacks power, a cylinder balance test will determine if both cylinders are operating to their full potential. You will need an engine tachometer, a spark tester, and an insulated screwdriver.
  1. Using the spark tester, with the plugs in, start engine and verify spark is equally good on both cylinders.
  2. Remove spark tester.
  3. Connect engine tachometer
  4. Run engine at top no load speed. Note rpm.
  5. Ground one cylinder spark plug with screwdriver. Note rpm.
  6. Ground other cylinder with screwdriver. Note rpm.
The difference in RPM between the cylinders should be less than 75 rpm. If the difference between the two cylinders is greater than 75 rpm, the cylinder with the least rpm loss is the weakest and is a potential problem.

Mar 26, 2015 | Garden

1 Answer

The car check engine light is on it says that it has a cylinder 6 misfire but we have changes the spark plugs and spark plug wires. The coil is in good condition we thought it could of been the O2 sensors...

i would start with a comression check first and rule out mechanical failure then try swapping injectors with another cylinder it should be one of those seeing the miss is cylinder specific

Feb 12, 2013 | Cars & Trucks

1 Answer

93 talon hard to start runs rough untill it warms up. (backfires dies exetera)

I would start with checking the fuel pressure and boosting the fuel with spraying carb cleaner into the air intake hose.
It sounds like you are not getting enough gas into the cylinders.
Could be a vac leak too.

Sep 30, 2012 | Eagle Cars & Trucks

1 Answer

Were is spark plug number 1 at on my 3 cylinder geo metro

On GM inline engines,cylinder #1 is the one closest to the front(pulley)end of the engine. If you pulled the wires off the distributor/coil pack,and don't know where they go,put one wire one at a time and crank it.If it doesn't backfire,repeat until it starts.(this is only easy on 4 cylinder or smaller engines)

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I took of*** my spark plug wires working on my small block 350 pickup and I don't remember the the firing order to put the new wires back on. Is there a diagram anywhere or is it even that difficult to...

Next time number each lead before you remove it and no. the dissy cap as well

The firing order, which should be cast into the intake manifold, for the chevy small block V8 is 1-8-4-3-6-5-7-2. The firing order is the numerical sequence in which the spark plugs are fired. The insertion position of each spark plug wire around the circumference of the distributor cap can be found according to a clock face. The insertion sequence determines the firing order. The firing order is followed clockwise around the distributor cap starting from the 6:30 position with the 6:30 position being the number one cylinder spark plug wire.
On classic chevy small block engines that use ignition breaker points instead of electronic ignitions, the number one cylinder is the one immediately clockwise of the small metal sash cover on the distributor cap. The firing order starts here. There is no sash cover on the distributor cap for GM HEI electronic ignitions, and the firing order is the same, but starting at the 5:30 position.
The firing order makes sense if you know how the cylinders are numbered. The number one cylinder is the front most on the drivers side and 2 being the front most on the passenger side. From front to back, the cylinders are odd numbered on the drivers side, and even numbered on the passenger side.
See the diagram; Click to open a printable larger image in a new window. The firing order starts with the number one cylinder. We would connect the number one spark plug wire to the distributor cap terminal in the 6:30 position. distributor.pngSince the next cylinder in the firing order is 8 (passenger side rear), we connect the number 8 spark plug wire to the next distributor cap terminal (approximately 7:30 position) in the clockwise direction from number one. You need to be sure you continue the firing order in the clockwise direction around the chevy small block distributor cap from the last installed spark plug wire. Setting the rest of the firing order is just a matter of repetition. Be sure to count the spark plugs from front to back on each side of the motor to identify the correct cylinder number in the firing order.

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1. First check you carburetor manifolds for intake leak warm the engine up and spray WD40 all around the where the manifold connects to the heads if the rpms change when you do thins you have leak replace the gaskets.
2. Your carburetor may need cleaning due to a blocked or partially blocked low speed circuit.

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Do you have the "firing order" correct? In other words, is each spark plug wire going to the same cylinder it was on before you changed the plugs? If you have done nothing else but changed the plugs then this is the most likely problem.
If when you try to start the car it backfires through the exhaust or backfires through the intake. Then this " IS" the problem. Good luck.

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