I'm pretty sure my valves need adjusted on my f135. My in cab vacuum gauge is bouncing from 15 -20 and it has a miss. Cylinder one has no change when i pull the spark plug cable either. IS this the correct diagnosis? other than the missing and tiny bit of power loss everything seems to be functioning fine. Give me a heads up if you think it may be more then at least I won't be so surprised if it snowballs into something bigger. Also I seem to have misplaced my FSM if someone could post up the clearances for intake and exhaust that would be awesome thanks.
Valves out of wack?
- Thread starter CruisinMT
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Coolerman
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Are you getting spark to that plug?
Butt Ugly Chuck
Fish Biologist
Can't say I'm going to be a lot of help on this one, but here's a couple of links for diagnosis from vacuum readings:
Vacuum 101 - Land Cruiser Tech from IH8MUD.com
On Fire
HTH
Butt
Vacuum 101 - Land Cruiser Tech from IH8MUD.com
On Fire
HTH
Butt
So this is your new F135 engine you built, correct?
How many miles do you have on this engine since it was put into service?
When was the last time you adjusted the valves?
- Thread starter
- #9
I adjusted the valves mid summer last year. The engine has probably 12000 k on it but the cam has less than that probably about 2-3 k. I'm hopefully going to pick up a 74 f engine. I'll keep this incase i need to sell it with the original in it.
Ok,
So since you installed the new camshaft, how many times have you adjusted the valves?
Coolerman
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Is the plug actually firing? Pull the coil wire off so the truck won't start, remove the #1 spark plug, ground it and crank the truck. If it sparks it's good.
Next if you have the tool, run a compression check on the cylinder.
Next if you have the tool, run a compression check on the cylinder.
- Thread starter
- #15
its weird it seems to be ok when i accelerate but at idle it jumps, my points look ok but my condensor is on the outside of the dizzy, how can i tell if it is bad? I'm getting spark to each plug. It seems as if the miss has traveled to the #2 cylinder now. It's really weird any tips or guesses would be awesome right about now, I'm starting to get frustrated it seems like it should be something simple.
It is possible for a plug to spark in free air but not spark under compression, substitute in a good or new plug.
Coolerman
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That's so true. I had a plug on a pressure washer that would spark all day out of the engine, but put it back in and it would not fire at all...
Change your spark plugs and your wire set....
If you do not start isolating things, you will be chasing your tail until you finally break down and do so.
Might be a intake leak also, try spraying some wd40 around the intake at the head while idleing and see if it picks up the cylinder.
- Thread starter
- #20
I got it running better, I swapped out the spark plug and it seems to have helped a bit. I will buy a new set of plugs today. oh and by the way the compression is at about 115 lbs in the #2 cylinder. what Napa brand plugs do you guys recommend?
