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Misfire from valve seal ?

  • Carstuff
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13 Jul 2019 19:31 #31758 by Carstuff
Misfire from valve seal ? was created by Carstuff
Can you get a misfire from leaking valve seals ?

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14 Jul 2019 08:38 #31773 by Tyler
Replied by Tyler on topic Misfire from valve seal ?
I suppose it's possible? If enough oil was running down the intake valve and getting sucked into the cylinder.

But, it'd have to be quite a bit of oil. :lol: You'd see smoke out the exhaust. You'd also see oil fouling on the spark plug.

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14 Jul 2019 08:41 #31774 by guafa
Replied by guafa on topic Misfire from valve seal ?
Hi carstuff,

Do you have oil smoke in exhaust pipe?

There would be a huge oil leak.

It doesn't make to much sense for me.

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14 Jul 2019 08:55 #31777 by Carstuff
Replied by Carstuff on topic Misfire from valve seal ?
there is no visible smoke while running, only on some startup light smoke. new plug with 0 miles never driven is already black. only from stating it and diagnosis running it. when warmed up misfire on that cylinder . pulled out the exhaust manifold and it was shiny black wet with some fluid droplets the other cylinders were dry black.

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14 Jul 2019 09:03 #31779 by guafa
Replied by guafa on topic Misfire from valve seal ?
Shiny black wet = exhaust valve seal?

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14 Jul 2019 09:05 #31780 by Carstuff
Replied by Carstuff on topic Misfire from valve seal ?
you will see droplets of fluid unscented , also notice how shiny and wet it is.

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14 Jul 2019 09:10 #31781 by Tyler
Replied by Tyler on topic Misfire from valve seal ?
Any coolant loss? Overheating? Possible blown head gasket leaking coolant into the combustion chamber.

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14 Jul 2019 09:10 #31782 by guafa
Replied by guafa on topic Misfire from valve seal ?
I have seen always at starting, mixtute is really rich (first pulses are five o six times wider).

Maybe spark plugs need more time/cycles to get the right color.

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14 Jul 2019 09:19 #31783 by Carstuff
Replied by Carstuff on topic Misfire from valve seal ?
no overheating no loss of fluid. im guess the droplets you see in the video link could be slight water coolant. however it doesnt smell like coolant. its possible it could be coolant not sure. it happens when warmed up assuming when thermo is open allowing flow.

all test done not sure why the ecu is shutting down the injector on that cylinder .

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14 Jul 2019 09:27 #31784 by Carstuff
Replied by Carstuff on topic Misfire from valve seal ?
I have seen a similar issue on another vehicle I worked on with a blown head but it was noticeable due to the piston top being clean and seeing coolant out the exhaust manifold under leakdown test.
however on this vehicle the piston is shiny black wet. unless there is a very small amount of coolant getting in.

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14 Jul 2019 09:43 #31785 by Carstuff
Replied by Carstuff on topic Misfire from valve seal ?
haven't even driven the vehicle since the plug was replaced. the vehicle came in with ignition parts and one new injector so im just backtracking checking things while diagnosing this issue.

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16 Jul 2019 17:10 #31855 by Carstuff
Replied by Carstuff on topic Misfire from valve seal ?
what could these droplets be from the video ? oil wouldn't make droplets I dont think. water does

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16 Jul 2019 17:35 #31856 by PDM
Replied by PDM on topic Misfire from valve seal ?
Coolant leaking into the cylinder like that will just look and smell like water. Fuel will smell like fuel and oil will feel like oil on your fingers. I doubt you will notice overheating or coolant loss if it’s a small leak. It doesn’t take much to wet the plug down and cause a miss

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16 Jul 2019 17:39 #31858 by Carstuff
Replied by Carstuff on topic Misfire from valve seal ?
the droplet doesnt feel oily and It doesnt have a scent to it. im assuming its water. the vehicle doesnt seem to get hot

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16 Jul 2019 20:00 #31864 by simclardy
Replied by simclardy on topic Misfire from valve seal ?
Did you do a leak down test?

Sent from my SM-G930V using Tapatalk

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17 Jul 2019 09:07 #31883 by Andy.MacFadyen
Replied by Andy.MacFadyen on topic Misfire from valve seal ?
My first move would be some type of compression test, my money would be on a piston ring problem.

" Welcome to the 21st"


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17 Jul 2019 17:38 #31903 by Carstuff
Replied by Carstuff on topic Misfire from valve seal ?
I thought compression must be the issue but all the cylinders are about 180psi. leak down test doesnt show any major leakage, similar as next cylinder to it. im guessing lifter issue. I connected a vacuum gauge and when its not misfiring before fully warmed up its in the green indicator when it starts misfiring it drops slighly out of the green indicator range.

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