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Sparkplug gap chart

What are the specks for the coil and plug I keep getting misfire'back fire

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The most common reason for that is the flywheel that has the magnet inclosed in it, has slipped out of position and affected the timing. Make sure the woodruff key is present and that it is lined up on the shaft and the slot in the flywheel.

Posted on Mar 24, 2014


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Posted on Jan 02, 2017


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Why does my vehicle stall when at idle.

Intermittin Engine Stall
Engine No Start
MISFIRE IN motor cylinder is more likely the cause to engine stall and hard start.
You will have to fix this problem first,
A misfire, most the time, is caused by, incorrect cylinder firing order (diagram at bottom). Or no or low cylinder compression
no or low compression is the result of A Vacumm leak.
If the timing chain was recently replaced, the valve cover had to be removed, the valve cover gasket could cause a huge vacumm leak which would effect some if not all 6 cylinders,

Lack/loss of power
Hard start
Engine hesitation

For Now
check firing order( coil pack to sparkplug)
check sparkplugs


I hope this helps for now
If you have any questions, you can email or post back

Mar 07, 2017 | 2006 Nissan Quest 3.5

1 Answer

How do i check of sparkplug misfire on a 2003 ford taurus

Go to Auto Zone or O'Reillys and have them hook up the code reader. The reader, if there is a misfire, will tell you which cylinder is not firing. That's your culprit. The firing order diagram is available online or in the store. It will tell you which plug is which.

Replace the plug. Ensure the gap is set correctly. That should be the end of it. If you really must visually inspect for spark then after pulling out the plug, re-attach the spark plug wire. Hold it by the wire end, where you are touching rubber to protect from shock. Have someone turn the engine over slightly. You wont have compression in the engine as the plug has left a nice size hole on the cylinder. But a turn or two of the key should produce a spark or two on the plug. If you dont see a spark, you may have a bad plug wire.

I'll bet you a $3 bill that your trouble is fixed back at step one. Replace the plug.

Feb 26, 2013 | 2003 Ford Taurus

1 Answer

No fire to the spark plug and need gap at coil and magnet

Without the engine type and HP,its hard to say. Most coils are set at .020"
If your not getting a spark at the plug, you should try a new one and see if you get one. if not, you may have rust on the flywheel magneto or the coil pickup face. All you need to do is sand it a little and try again.

Mar 08, 2012 | Garden

1 Answer

My 1969 triumph bonneville keep burning sparkplugs ( every part is new )

Just so we\'re on the same page, by "burnt spark plugs", you mean the porcelain tip is white with no sooty or oily residue, right?

Could be the ignition is retarded too much (with will make an engine run hot)

Spark plug gaps that are too close will not fire lean fuel mixtures.

Wrong carb jetting/adjustment.

Here is a spark plug diagnosis chart:

By "burnt spark plug", I\'m assuming you mean what the chart refers to as "overheating"

Feb 26, 2012 | Triumph Bonneville Motorcycles

2 Answers

Saw will not run or start...set ignition module gap, disconnected kill switch wire because there was no spark...Put in new spark plug, got spark..Primed for gas and set choke as per instructions...Would...

Often the cause is a failed fuel pump diaphram. Rebuild the carb... kits about $20. The diaphram works from engine vacuum pulses. Also the little flap type check valves go bad... the ethanol in gas doesn't help this problem...

Sep 03, 2011 | Poulan P3314 14" Gas Chain Saw 2.0 Cuin...

1 Answer

We can not figure out why my 1990 dodge ram keeps back firing we replaced the plugs, button, cap,wires and coil and its still back fires

You need to get an exact firing order diaghram for your make,model and engine,

call any autoparts store, and they will give you the firing order for your truck, if one

or more wires are wrong, can cause the engine to backfire or run bad. also make

sure you have the correct gap on your sparkplugs. check and set the timing,

if needed, the auto parts will also have the timing marks position. good luck!

Jul 10, 2011 | 1990 Dodge Ram

1 Answer

I feel a misfire but there no codes stored on the ecm

More than likely you need new spark plugs, or you have a bad Coil on plug. To test each coil on plug, read the following:
  • A commercial coil tester, available from many tool suppliers, is an excellent way to test suspect coils. If the coil can generate a spark on the tester, the coil should be in good condition.
  • An ohm meter can also be used to test coil winding resistance. Primary-side resistance, from coil minus to coil plus, is typically between 0.3 and 1.0 ohm on electronic ignition type coils.
  • Secondary resistance values vary widely, so consult a specifications chart for the engine you are servicing. If a spec chart isn't available, compare secondary readings among all the coils to see if any one is higher than the others. A high resistance indicates deterioration in the wiring. Surprisingly, a coil with high resistance may still fire the spark plug, but the voltage produced will be higher because the current must jump the open wiring in addition to jumping the spark plug gap.

Jun 02, 2011 | 1999 Lincoln Navigator

1 Answer

Engine misfiring.

most all v8's have the same firing order which is 1,8,4,3,6,5,7,2. sparkplug gap seems fine. with the engine off, bend the sparkplug wires between your fingers, if small cracks appear then replace them. number one sparkplug is located at the front driver side of the engine, front to back on this side are cylinders 2,4,6, and 8 respectively. turn the engine to the compression stroke on number one, pull the cap, the rotor points where number one will be.

May 11, 2017 | 1996 GMC Suburban

2 Answers

2001 elantra, check engine light comes on and I get a cylinder 2 misfire

Inspect #2 spark plug and the ignition wire to it. Inspect the connector to the plug and to the coil... replace as needed.

Nov 02, 2009 | 2000 Hyundai Elantra

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