Bad things

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bish042287

New member
Hey there everyone, I'm a new member to this forum and i bought my 92 Typhoon back in Dec 07. Just recently though ive been having bad problems with the truck. I orginally thought it was the torque convertor going out in the truck due to a bad shutter when trying to speed up. So i brought it to the shop and the mechanic said the tranny was fine, but i have a bad miss fire in #3 due to a broken spark plug. the compresson is at 50lbs in that cylinder. so now i have a knock and he says i might have bent a valve due to the spark plug breaking. Just wondering if anyone else has any insight on what else it might be. thanks matt
 
S

syclone0209

Member
Re: Bad things

hole in piston. broken ring land. do a leakdown test and see if its leaking through the intake or through the crankcase. when its running take of the oil filler cap and see if you can feel combustion pulses coming up through it.
 
turbodig

turbodig

Active member
Re: Bad things

bish042287 said:
Hey there everyone, I'm a new member to this forum and i bought my 92 Typhoon back in Dec 07. Just recently though ive been having bad problems with the truck. I orginally thought it was the torque convertor going out in the truck due to a bad shutter when trying to speed up. So i brought it to the shop and the mechanic said the tranny was fine, but i have a bad miss fire in #3 due to a broken spark plug. the compresson is at 50lbs in that cylinder. so now i have a knock and he says i might have bent a valve due to the spark plug breaking. Just wondering if anyone else has any insight on what else it might be. thanks matt
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Any detonation large enough to break a plug like that has likely destroyed a piston.
The knock is probably a rod or a bearing, although it's tough to say without hearing it.

Either way, you're going to be pulling the cylinder head on that side, so I'd start there.
If there's nothing visually wrong with the valves, you've got deeper problems.
 
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