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Why would a cylender not fire if the plug has spark and all other cylenders are firing?

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2 Answers

What test told you it is not firing?

You may have valve damage &
little compression

Posted on Jan 09, 2013

Testimonial: "i pulled the wires, one by one, then when i found one that did not change engine sound, i pulled the plug and found good spark. Also, oil is coming from valve cover hose to air filter. I have also been dealing with water in the gas for several days, which was causing power loss and sputtering. Draining fuel/water seperator would temp. fix problem, allowing me to continue up river at full power"

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  • Cars & Trucks Master
  • 14,036 Answers

If cylinder getting spark not firing not getting fuel.could have plugged fuel injector or faulty fuel injector.i would use a noid test light see if fuel injectors getting power and firing.hook noid light to fuel injector electrical connector need a helper which crank engine while you look at noid test light.if test light blink pcm is working.steady light pcm not noid light means fuel injector electrical connector has short in wiring or can buy fuel injector noid test light at auto parts stores if not snap on tools has them.

Posted on Jan 09, 2013

  • richard glascoe Jan 09, 2013

    Thanks. moter is on jet boat, no efi, holly carb. Also water has been in my gas and boat on river so I could not drain. Tried to burn through it by perriodicly draining fuel water seperator. Now cylender not firing and oil comming from hose from valve cover to air filter

  • Jonah Oneal Jan 09, 2013

    check cylinder not firing could have low compression.internal combustible engine need intake stroke. compression stroke. firing stroke and exhaust stroke.take away compression stroke engine cant compress air fuel mixture a compression stroke see what happening.


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Posted on Jan 02, 2017

  • 121 Answers

SOURCE: thick blue smoke. no oil

Hi! Chris, There are many causes of oil burning or exhaust smoke. There are three different causes of normal oil burning, 1; worn valve guides (smoking during deceleration), 2; worn cylinders and piston rings (smoking during acceleration), 3; split or worn out valve seal, or damaged intake manifold gasket (smoking all the time). Of course there are several variables in this equation. Sometimes coolant can also get into a cylinder and cause a blueish smoke. If you remove the spark plugs and use a pressure pump on the coolant system (radiator), coolant should leak into the intake manifold or cylinder. Coolant leaking into the intake manifold will leak into several cylinder through the valves. So, what year and how many miles are on the Jaguar?

Posted on Aug 09, 2008

  • 9 Answers

SOURCE: I have a 1999 Ford

You may consider tracing back from coil back to the main plug and checking wires going into and coming out of the plug for any broke wires make sure to look for collapsed casings sometimes the wires will break internally

Posted on Aug 13, 2008

  • 22 Answers

SOURCE: no spark on # 5 cylender 1989 cavalier z24

change the control modul. that control voltage to the coils. it sound like it not bleeding off fast enough the control modul is under the coils. befoe changing any part remove ground off battery. befor change any coils u could of swop to see if this is still not firing

Posted on Mar 05, 2009

  • 184 Answers

SOURCE: random miss fire on all cylenders on a 1999 honda

Random misfire can be a lot of things. Some good general guidance is at

Posted on Oct 04, 2009

  • 36 Answers

SOURCE: firing order for toyota camry v6 1996

the firing order is in fact 1 2 3 4 5 6 the number one cylynder is on the left at the back, as you look at the engine from the front >>
positions of cylinders
1 3 5

2 4 6

Posted on Mar 15, 2010

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99chevyblazer mlss fireing on cylender one

Could be #1 spark plug, or ignition wire to # 1 plug. Can also be lack of proper compression in #1 cylinder, caused by bad or worn piston rings, or valves not sealing properly. When you check spark to #1 it should be a nice blue color not yellow, yellow is a weak spark and doesn't fire properly under compression

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Cylender order for spark plug wires

5.0L HO Firing Order: 1-3-7-2-6-5-4-8
4.6L Firing Order: 1-3-7-2-6-5-4-8
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If you need a diagram, follwo this link...

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No spark on # 5 cylender 1989 cavalier z24

change the control modul. that control voltage to the coils. it sound like it not bleeding off fast enough the control modul is under the coils. befoe changing any part remove ground off battery. befor change any coils u could of swop to see if this is still not firing

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And if u do find a cylender thats not fireing what next

It sounds as if you either have a faulty spark plug or a faulty high tension lead you need to check the plug and lead on the cylinder that is not firing. If they are OK the only other cause could be a lack of fuel to that cylinder.

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