Spark plugs a-poping

[90ford]

I have a 90 SHO, mtx and still is as strong as ever besides the body work.
ever since a few months ago one spark plug poped out while driveing and its sounds like a poor harley running. then i found out that the spark plug stripped out the head and i had to put a thread savering the the head and now it works but now another plug came shooting out and i was woundering if that is caused by the alumnium head fatigueing??????????? the car has over 190 k miles on it but it still can kick alot of ass

 

[1slickRED89]

they might not have heat treated the head right at the factory, I can't imagine how it could pop out.

they had the same problem with the 4.6L 2 valve but that's a half thread hole and when you get (( non-torqued spark plug + minimum tolerances threads) + non treated heads ) = only 2-5 threads engaged = liberated plugs

 

[SASHO91]

hate to be the bearer of bad news, but it sounds like your gonna need some new heads. Not unless you take yours off and have a machine shop redo the affected plugs. then you could run different sized plugs in those. (dont know if thats possible or not, but it sounds plausible)

or better yet, find a 3.2 and drop it in....

 

[hawkeye18]

that's friggin' weird, dude. I've never heard of that before. Yeah, sounds like you got some bum head.(s) I think Josh has it right when he says to drop a 3.2 in there . But yeah, at the least replace the heads. The whole assembly is suspect.

 

[thecrew2999]

thats somethig ive never heard of myself... well if you need heads i got some 3.2 heads i cant seem to get rid of... id let em go for cheap since you got a 3.0 ........ for the love of god someone need heads..... **** ill even gasket match em

 

[90ford]

i really dont want to replave the heads cause of $$$$$ issues but i found out that save-a-thread works well in the head cause u install a steel thread into the aluminum head the spark plug doesnt pop out any more and its a cheap fix untill i get MORE $$$$$$
Unless some one would want to buy some parts off of me cause i will sell the car as a whole or i have a catless and catted y-pipe, black body kit, stock MAF but i have many upgrades on the car

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90 MTX 3.0, 73MM housing with stock sensor, bias plugs, new clutch and flywheel, new tires, new rear claipers with working e-brake, airfilter housing cut wide open, k&n filter, catless y-pipe custom 2.25" exhaust duals (2-1-2), custom a/c delete w/cable hold down, shorter shiter, GM spoiler from a lumina, solid sub frame bushings, lowered front and rear, white faces gusges,