Engine Backfire Diagnosis Led to Wiped cam Lobes

[350runner]

Get the valve lash done and let's see what that does. I remember you said something about ticking in the valve train

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[Skweegle89]

85swb "Fancy"

Nice... Kinda wish I had gotten a bigger cam.

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I assume it's not normal... It didn't used to pop like that. I will take a video tomorrow so you can hear it. The truck sounds awesome when reved, but the idle surges and it pops like that at idle. I didn't drive it today but I did back the idle mix screws out a bit more to see if it would help and it didn't.


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[350runner]

Alright.

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[Skweegle89]

85swb "Fancy"

I can't remember if I asked this the other day or not, but if I'm not running my vacuum advance, is my timing too retarded at 12*?


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[350runner]

I would say test to advance some more, but that back firing is questionable. Give it a shot.

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[Skweegle89]

85swb "Fancy"

I have to go to town today so I'm going to go ahead and pick up some stuff I need to find the problem. New PCV valve, mines a bit broken and keeps trying to push out of the grommet. New square bore gasket, so I can slap the Eddy back on and make sure that my tall adapter isn't causing too much turbulence. a new intake gasket in case nothing else works. I might grab some sea foam to run through it to help clear out any crap that might be in the fuel system. Probably due for a new set of plugs, as these already have about 15 minutes of run time on them and are probably fouling out already.


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[Skweegle89]

85swb "Fancy"

I will set the lash first, and then proceed with all this other stuff.


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[Skweegle89]

85swb "Fancy"

The first vid is just of me starting it cold. Doesn't seem too bad today. The popping starts in the second vid after it warms up a bit.
https://vimeo.com/115651537


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[Skweegle89]

85swb "Fancy"

https://vimeo.com/115651633


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[350runner]

Sounds like a good plan

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[Skweegle89]

85swb "Fancy"

Well I got everything but the carb gasket. Guess I will reuse one of my old ones. Did you have a chance to watch that video?


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[350runner]

Yea that's a miss fire. Like a valve.

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[350runner]

That pop is the same cylinder that is back firing

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[350runner]

Make sure you have zero leaks from your header gaskets.

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[Skweegle89]

85swb "Fancy"

I was about to ask about that. I think I have a manifold leak. I could hear it ticking yesterday. I will try to tighten it. Not going to be good if I have to replace them. There are a few bolts that are broke off and I don't think they are going to be easy to get out.


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