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Cracked Spark Plug

evil821

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evil821 New Member

evil821

Posted
Posted

Has anyone ever experienced a plug cracking? I have an '09 Denali, had the plug in #8 crack 3 times in 5.5 months. Also loosing coolant, dealer cannot come up with a solution for either, latest attempt, switched coil, plug and injector with 3 different cylanders, now just a matter of time until issue occurs again. Claims no coolant on plug when pulled. It's not on my drive.

 

Any thought?

00Silverado4x4 Senior Enthusiast

00Silverado4x4

Posted
Posted

Initial thought but the plugs might be over torqued when installed. It doesn't take much to crack a plug on install. I've done it more time than I can count. Also check around the area to make sure there is nothing that might be bumping into the plug. I don't have any ideas on the coolant loss but there is several topics discussing coolant loss here. I'd try a search & see if any of them might help you out.

evil821 New Member

evil821

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  • Author
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The ceramic has cracked on each occasion. The car is an '09 and has 21K on it and the issues started at about 16K. The problem has occured at start up and while driving. I hope a trained tech has not over torqued the plug that many times.

jdubub Senior Enthusiast

jdubub

Posted
Posted

sorry to hear about this. do you have any pics of one of the spark plugs to put up?

GMstrong Enthusiast

GMstrong

Posted
Posted

I dont if its just me but your not a "trained tech" if you cant put a spark plug in right without over torquing it but you them dealerships they love impact wrenches.

ChevyTech77 Senior Enthusiast

ChevyTech77

Posted
Posted

Last I checked, you aren't going to crack the porcelain part of the spark plug too easily, by over torquing it. It certainly can happen from mis-handling the plug prior to installing it, quite easily. Possibly even from thermal shock (hot to cold, or vice-versa, quickly). Besides, try and think about it logically, how is it making it out of the shop without missing if the damage is done upon installation?

 

How much coolant loss is there?

evil821 New Member

evil821

Posted
  • Author
Posted
Last I checked, you aren't going to crack the porcelain part of the spark plug too easily, by over torquing it. It certainly can happen from mis-handling the plug prior to installing it, quite easily. Possibly even from thermal shock (hot to cold, or vice-versa, quickly). Besides, try and think about it logically, how is it making it out of the shop without missing if the damage is done upon installation?

 

How much coolant loss is there?

 

 

It is a slow loss on the coolant, it is my wifes vehicle so I am in it on rare occasions. It has been an issue since 6K. The pressure tested and stated system was fine. I would say I have had to fill it 5-6 times. It has overheated at least once. They claim if it isn't on the plug, it can't be a head gasket??? It's pissing out somewhere.

 

They have a picture of the plug at the dealership, they have admitted that they are not sure what the issue is, now a GM engineer is suppose to come down to figure it out, which will be damn near impossible since when it is hooked up after plug and coil replacement it looks fine.

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