3FE has no compression in cylinder 2

Joined
Feb 18, 2013
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Hello all,

Long time reader but this is my first time posting. I picked up a new toy this week (91 fj80, 170k original miles, 3FE). It had been idling extremely rough and in order to keep it from stalling you had to give it a little gas... with no OBD 1 codes

First thing was to check all the vacuum hoses and test them, then checked the AFM, then cap, rotor and plugs. That all checked out and I ran a compression test. Well every cylinder was in spec EXCEPT cylinder 2 (counting from the front) which had zero compression. I stuck my finger on there and it almost felt like it was sucking.

Any thoughts? Stuck valve?

Going to try to get the valve cover off today if I get time. Who knows when the last time they were adjusted.
 
Joined
Feb 18, 2013
Messages
8
And before the haters come, I have an FSM on the way. I've learned the hard way with a 94.
 
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Feb 18, 2013
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Well it looks like the valve guide broke on the intake. Going to have to find a good machine shop in the phoenix area. Anybody know of one?
 
Joined
Feb 18, 2013
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It did not drop the valve into the cylinder. Okay, awesome. I will check them out
 
Joined
Nov 9, 2012
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7,747
Location
Olathe, KS, USA
It did not drop the valve into the cylinder. Okay, awesome. I will check them out
The only things that will break a valve guide are:
Bent Valve (How did the valve bend? Debris? Carbon chunk? Lack of lube?)
Stuck valve (sat for a LONG time, seized, then tried to start and bent/broke)
Other internal failure

A broken guide CAN lead to a valve dropping into a cylinder and causing major piston damage.
It can also lead to cracking a head.

Good luck!

I hope you find the root cause easily (and cheaply!!!)

I hope you got it for a song!
 
Joined
Feb 18, 2013
Messages
8
The only things that will break a valve guide are:
Bent Valve (How did the valve bend? Debris? Carbon chunk? Lack of lube?)
Stuck valve (sat for a LONG time, seized, then tried to start and bent/broke)
Other internal failure

A broken guide CAN lead to a valve dropping into a cylinder and causing major piston damage.
It can also lead to cracking a head.

Good luck!

I hope you find the root cause easily (and cheaply!!!)

I hope you got it for a song!
It was a song and a half...

Will keep you posted! This should be interesting
 
Joined
Feb 18, 2013
Messages
8
Well, we finally got around to taking the head off. It ended up being a stuck intake valve. But no damage to this piston thankfully. Machine shop said it was due to old/bad gas. The varnish built up and broke the valve guide. Going to check for cracks, then rebuild/replace. Anybody know where to get rid of 20 gallons of gas?
 
Joined
Nov 9, 2012
Messages
7,747
Location
Olathe, KS, USA
Well, we finally got around to taking the head off. It ended up being a stuck intake valve. But no damage to this piston thankfully. Machine shop said it was due to old/bad gas. The varnish built up and broke the valve guide. Going to check for cracks, then rebuild/replace. Anybody know where to get rid of 20 gallons of gas?
Check with local municipality on how to properly dispose of haz-mat. I recently dropped off 5 gallons of old gas to the City and they poured it into their drum and handed me back my can.
 
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