Its Official #3 cylinder is DEAD

[CruisinFJ60]

Monday on my way to work I had a cylinder foul out on my truck, I was goin down the freeway when it felt like i shut off the key for just a sec then turned it back on and it kept on truckin along just with a loss of power.
Ok no big deal probally #6 like it always is. So i drove my other truck past 2 days and pulled #6 plug out... Yup dirty as hell clean it up put it back in and fire it up... Hmm still missing... while running pull #6 plug wire off truck runs worse... ok plug it back in and start from #1 now while still running...
#1 nope idle drops
#2 Nope again idle drops
#3 No change at all in idle.
The wire had good spark so i pull the plug looks bad but not as bad as #6 was so i clean it and reinstall... well still missing so i pull the plug wire and again #3 no change. I then shut it off and check it again it covered in gas... ok so maybe the plug is no good so i plug the plug into the wire and fire it up pick up the plug and ground it out. Nope plug has a beautiful blue spark... ok so plug is good... clean it up again and re install fire it up and guess what no change #3 is dead.

I havent done a compression check yet but im sure it is to hell.
The truck has had piston slap the whole time i have owned it and thats been a little over 30k miles and 2 years now. Its been wheeled hard and driven like it was stolen. It has the original I6 still, and untouched bottom end. and the Odometer curently reads exactly 237,400 miles
Motor has been good to me but now its time for a 2FE!

 

[D'Animal]

Blown Head Gasket?

 

[Trapper50cal]

you

you gonna just re-ring it and put a 3FE head or rebuild the whole ting or what?
(sorry to hear that btw)

I finalized (wore-out) a 69 1F in my 76 FJ55 at something like 349,000 so I know what its like to say goodbye to something that hauled you around for a long time.

 

[CruisinFJ60]

Blown Head Gasket?

naw.

Im guessing just super low compression. or a broken ring or something along those lines. It has been using more and more oil everyday. usually 2-4 quarts every 400 miles but last week it used 5.5 qts in 200 miles.... yea... oh well worse things have happened to me before.

you gonna just re-ring it and put a 3FE head or rebuild the whole ting or what?
(sorry to hear that btw)

I finalized (wore-out) a 69 1F in my 76 FJ55 at something like 349,000 so I know what its like to say goodbye to something that hauled you around for a long time.

A friend of mine has a complete 2F that we beleive to be in good shape and i have a complete 3FE with harness and computer that has a good top end (rod knocking down low) so depending on money and how bad i need the truck. (not that bad) I want to bore his motor im getting from him .030-.040 (i have pistons but cant remember what size bore they were over) then take the 3FE head and and Port it to the best of my abilities and get a RV cam and maybe some headers (but probally not on the headers) and I guess go from there. Till the other motor is done i will leave mine in the truck so i can still drive it if i want to.

 

[RockDoc]

If you are going to port it yourself, I would pick up a copy of this book. Just google it and you'll find the online auto bookstore I picked it up from. I want to pick up a spare head and play around myself when I have a chance.

 

[mkguyvr]

sounds like it has had a bad wrist pin or pin bearing if it has had piston slap for a while.As this gets worse it compresses the rings in some cases making them nonefective at holding compression.Never the less good luck with it.

 

[jts560]

Same thing happened to mine about 3 weeks ago. I was on the highway and noticed it was struggling to get over 60mph, when I came to a stop it was idling rough. It tends to lose about 1 - 1.5 quarts every 100 miles and foul the plugs enough that I need to change them about twice a year, so thats what I figured it was. Changed them and no difference. After some troubleshooting I believe the exhaust valve in #4 is the culprit, exhaust sucks in for and instant and I have about 55psi on that cylinder.

I blame $4 a gallon gas.

 

[CruisinFJ60]

If you are going to port it yourself, I would pick up a copy of this book. Just google it and you'll find the online auto bookstore I picked it up from. I want to pick up a spare head and play around myself when I have a chance.

ill look into the book, Ive done some mild porting before tho so i have an idea what i wanna do. Im not looking for anything crazy I am just gonna try and keep as even a flow as possible while still opening the ports up some, to possibly releasie some power these I6's might be hiding.

 

[IndianDoc]

Monday on my way to work I had a cylinder foul out on my truck, I was goin down the freeway when it felt like i shut off the key for just a sec then turned it back on and it kept on truckin along just with a loss of power.
Ok no big deal probally #6 like it always is. So i drove my other truck past 2 days and pulled #6 plug out... Yup dirty as hell clean it up put it back in and fire it up... Hmm still missing... while running pull #6 plug wire off truck runs worse... ok plug it back in and start from #1 now while still running...
#1 nope idle drops
#2 Nope again idle drops
#3 No change at all in idle.
The wire had good spark so i pull the plug looks bad but not as bad as #6 was so i clean it and reinstall... well still missing so i pull the plug wire and again #3 no change. I then shut it off and check it again it covered in gas... ok so maybe the plug is no good so i plug the plug into the wire and fire it up pick up the plug and ground it out. Nope plug has a beautiful blue spark... ok so plug is good... clean it up again and re install fire it up and guess what no change #3 is dead.

I havent done a compression check yet but im sure it is to hell.
The truck has had piston slap the whole time i have owned it and thats been a little over 30k miles and 2 years now. Its been wheeled hard and driven like it was stolen. It has the original I6 still, and untouched bottom end. and the Odometer curently reads exactly 237,400 miles
Motor has been good to me but now its time for a 2FE!

It is my sympathy at your loss. My 85 ,bought used, started great and ran ok for 9 months until I decided to rebuild just because it had 190+ miles and I was doing a rebuild anyway. Point was that the carnage inside was amazing two ovaled cylinders that had to be oversized and two different valve's that were in all effects inoperative due to excess cam lobe wear. These engines are toughf. Would not have thought it possible for it to run as well as it did, for as long as it did in that condition. Any way it's bored new cam: well new everything now. 2FE sure sounds interesting be sure and post lots of pictures for us wannaknows out here.

 

[CruisinFJ60]

im a picture whore so that part will be pretty easy.

 

[Trapper50cal]

LOL

Pix whore here too...

Here's some non-specific inspiration
(of the motor Ige now has)

By trapper50cal, shot with DiMAGE S404 at 2007-09-04

By trapper50cal, shot with DiMAGE S404 at 2008-06-26

By trapper50cal, shot with DiMAGE S404 at 2008-06-26

By trapper50cal, shot with DiMAGE S404 at 2007-09-04

By trapper50cal at 2007-09-04

By trapper50cal, shot with DiMAGE S404 at 2007-09-04

built it when I blew up that 1F
It didn't really need an Offy Intake & 4BBL though, runs pretty rich jetted and needled almost all the way down on that 500cfm edelbrock.

 

[sdbrassfield]

I recall reading in here of that symptom a couple of times. It was something in the carb that went bad and was dumping fuel into the first three cylinders...Can not remember what it was but there was also something about a article in the toyo offroad mag. Anyone recall this...?

 

[Trapper50cal]

I always

I always thought #5 and #6 ran richer due to inertia.... is that a myth?

 

[CruisinFJ60]

I recall reading in here of that symptom a couple of times. It was something in the carb that went bad and was dumping fuel into the first three cylinders...Can not remember what it was but there was also something about a article in the toyo offroad mag. Anyone recall this...?

its not 3 cylinders it is only #3 cylinder.

I always thought #5 and #6 ran richer due to inertia.... is that a myth?

myth unless someone can prove it to me.

cause once your moving all the fuel in your truck and everything else is all moving the same speed... if that were true then #1 & 2 would run rich when you hit the brakes.....