Dead Cylinder

Today will determine if the pcv location was the problem..if so..done..if not im moving on to getting that port wet with fuel , even if i have to intoduce it..if that cyl comes to life than i know it will live and at that point than i will need to find out why it wont do it with out help from daddy.

and at that point it could be gasket, or fit on the manifold..

i will do a lash check, and a few of the other less invasive approaches.(other cyl comp checks tec..).if those steps (taken one at a time) dont produce a result, than the intake is coming off

i only get like 3 hours a day on the week days to play with my broken toys..so i have to do what i can with the time i have

and today sucks ass..its 90 out and raining..so 100% humidity and 90 degrees , just what you want to do after working 10 hours on a hot job to begin with.....yeah i know waaaaaaaaaaaa.....lol

 

Have you tried shooting some gas into the spark plug hole, putting the plug in and firing it up? You could see how long it fires for and maybe if you have a leak you'll see a sign of it along the intake somewhere.

Another wild trick, funnel a little talcum or baby powder down the spark plug hole, out the plug in and start it, you may see a cloud come out somewhere.

Bob

 

Sorry, I will back out. He wants to do the easy stuff first..... Basics are the key... I guess that I should just diagnose my own junk.

(My point excactly !!! New don't mean shit and everybody that throws their 2-cents in on this thing assumes everything is perfectly done. If you go to the basics and eliminate them 1 at a time you'll find the problem. I recomended to check the valve lash back on the 2nd page. And if a leak down test was done it would eliminate alot of variables >>>>. )<!-- / message --><!-- sig -->

 

hahah funny you say this
me and Lippy were just talking about the same test..its on my to do list

 

its all good my man..and i thank you for your input..its all useful

 

I always do the free and easy things first. Sometimes you flat out get lucky. I wish I was there, love these type of problems.. of course when they happen to someone else.

Bob

 

Right on Bob

 

#### BINGO !!! So you have an engine that runs smooth as a tic and pulls decent vaccum, doesn't misfire, or blubber, but it reads low exhaust temp on 1 cyl. Once again if it was me, I'd check the valve adjustment to make sure that when the lifters pumped up you didn't lose the preload, and I'd do the leak down test to check the,RING SEAL, and the valve seat seal as i've seen the valve seats leaking be the cause of problems like this,and I would re-check the valve spring seat pressure too. I'm not trying to be a smart ass or a know it all but just trying to help you out >>>>.

 

How about a dry set of rings? It may pump up the cylinder nicely and show 150 PSI on a compression gage, but what about under a running condition load? A couple of shots of MMO would do the trick.

The valve adjustment is a good idea, free and relatively painless.

Bob

 

I am going through a similar problem with me car...checking vaccum readings tonite.

 

cool..(well not really) but if you find your problem would you come back here and tell us about what you find?

thanks man

 

wait a minute- just to clarify- this dead cylinder, is it EVER firing? You state that the plug looks brand new, like out of the box and only gets dirty when installed in the other holes because it fires in the other holes, right?

and NO other plugs that are good will fire in that hole, right? So if you're SURE the dizzy, cap, wires, and plugs are good, and the plug NEVER fires in that cylinder, have you checked for spark from the wire to determine if the points cam is opening and spark is actually making it through the plug and firing it across the ground strap as it is held to the block while running?

If that hole NEVER fires at any load/rpm then it's unlikely a fuel mixture issue could be THAT bad- is there a different (wrong) antiseize put on those threads? some other electrical issue that would isolate ONE cylinder? since your gonna run it in the dark without the headers, run it in pitch black garage WITH headers and look for any glowing electrical discharge or voltage leaking- you'll be surprise how much light comes off an engine in total darkness when dealing with stock type parts that may have leakage.

if the cylinder IS sometimes experiencing combustion then look to mixture/vacuum leak etc... but i'd rule out a plug wire that shorts when installed, but not when tested....

 

Thats the one everone says oh,I double ckd it ,It can fool even seasoned pro`s,even me.

 

Ok ..here it is 400 degrees on #1 ..all that was changed is one thing
Ready?

That fucking pcv can't be plugged into that location
All is up and hammering on all 8 at idle or any where in the full
Swing of the throttle

Hamb cured!

 

Ok ..here it is 400 degrees on #1 ..all that was changed is one thing
Ready?

That fucking pcv can't be plugged into that location
All is up and hammering on all 8 at idle or any where in the full
Swing of the throttle

Hamb cured!

 

Thanks to all that took the time to respond...even if it wasn't the reason its all good
And I thank you all for your support...brotherhood , what a deal

 

Thanks to all that took the time to respond...even if it wasn't the reason its all good
And I thank you all for your support...brotherhood , what a deal

 

I am confused. You say that it idles smoothly but one cylinder is not firing at all. It has been my experience that if you have a truly dead cylinder that they do not idle smoothly. Try pulling the plug wire to that cylinder while the engine is running and observe the expected decrease in rpm and idle quality. Do the same to another cylinder and compare the difference.

Has this manifold been run on another known good engine? It should have an open passage between the manifold plenum below the center carb to the intake port of the cylinder being supported by the end carb. I remember that you checked one of the manifold passages but don't remember if you checked that one. It may have an obstruction.

Mike.

 

nice....glad its running on all 8...

 

Glad to hear it. Was hoping that was it.

 

If that header tube is cold, we already can assume that hole's not firing. I wouldn't waste my time there. But, glad it's fixed

 

The end

 

Wtf?
You show up after all the hard work is done ,and that's all you got?
The end!?



Hahaha love you man

 

I've read every post, then you said it was fixed right. I just thought that it should have the proper ending.

 

Good deal enjoy driving it.

 

Hah Great !!! You do know TRADITIONAL HOT-RODS don't have PCV systems !!! >>>>.

 

I suspected that PCV a while back in the thread. Best to have it pull evenly near the intake center. Good job Randy!

 

Thanks, but I can't take all the credit..I did have good guidance

 

I can't wait for that day

 

Had to raz ya for being late to the party