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Spark plug change now engine misfire

AnalStick

By AnalStick,
in General Maintenance

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AnalStick Enthusiast

AnalStick

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so i have an update i took my valve cover off and i found coolant in the second sparkplug chamber, i cleaned it up thinking i just spilled some in when i took the valve cover on so i put my old sparkplugs in put the car back together and took it for a drive, it started misfiring again after about 20 mins this time so i drove back home and took off the valve cover and then again i have found coolant in the second sparkplug chamber, 

Ben C34 Grand Master

Ben C34

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23 minutes ago, AnalStick said:

so i have an update i took my valve cover off and i found coolant in the second sparkplug chamber, i cleaned it up thinking i just spilled some in when i took the valve cover on so i put my old sparkplugs in put the car back together and took it for a drive, it started misfiring again after about 20 mins this time so i drove back home and took off the valve cover and then again i have found coolant in the second sparkplug chamber, 

Well thats good you found it but a mystery as to how it gets in there.

now

get poking anal stick (to find the answer.)

AnalStick Enthusiast

AnalStick

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1 minute ago, Ben C34 said:

Well thats good you found it but a mystery as to how it gets in there.

now

get poking anal stick (to find the answer.)

im going to run it without the valve cover on to see if anything is leaking

AnalStick Enthusiast

AnalStick

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20 minutes ago, GTSBoy said:

Coolant in the spark plug bores can only get there from a cracked head.

So there is no coolant on the spark plugs, just where the coil is sitting I highly doubt I cracked the head when tightening the plugs hahah 

Edited by AnalStick
GTSBoy Grand Master

GTSBoy

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OK....Riddle me this. Where is the coolant coming from, to get from the inside of the head to the outside of the head?  Where is the nearest coolant?  Is it squirting from a hose and somehow finding its way under the coil cover?  No, of course it isn't. The coolant is running in galleries in the head. There is either a crack, or a welch plug is leaking.

AnalStick Enthusiast

AnalStick

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Update: so now car is misfiring on startup and engine light comes on right away, but after i go to second gear the misfire stops and wont come back. car drives completely fine but has the engine light on and then when i restart my car later in the day this happens again but i drive it and the misfire stops

Kinkstaah Grand Master

Kinkstaah

Posted
Posted

I had similar issues with a cracked block, multiple times. What was happening is on low rpm the coolant pressure was enough to get into the bores and cause a misfire. Rev the engine enough and combustion pressure was enough to push combustion gas into the coolant, so while it wouldn't miss... it was very obviously pressurizing the coolant.

This will get worse before it gets better. Pepare yourself for replacement engine time.

Misfires and Coolant being in places it should not be is never a good combination.

AnalStick Enthusiast

AnalStick

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7 hours ago, Kinkstaah said:

I had similar issues with a cracked block, multiple times. What was happening is on low rpm the coolant pressure was enough to get into the bores and cause a misfire. Rev the engine enough and combustion pressure was enough to push combustion gas into the coolant, so while it wouldn't miss... it was very obviously pressurizing the coolant.

This will get worse before it gets better. Pepare yourself for replacement engine time.

Misfires and Coolant being in places it should not be is never a good combination.

so the coolant is only getting into the chamber when i take apart the hoses so its just leaking in there. i am pretty sure i have found the issue i decided to unplug all the coilpacks and one of the plug connectors wires wernt in the connector all the way so i took it out and it fell apart in my hands

20190428_144243.jpg

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