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Technical Discussion Forum For the discussion of technical questions about Professional Cars and their repair and maintenance. Posting in this forum is limited to PCS Members and / or Site Supporters. We encourage all website users to become members of the Professional Car Society and / or become Site Supporter.

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  #51  
Old 02-16-2018, 11:47 AM
Peter Grave Peter Grave is online now
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Gap on new plug looks wrong what do you think Ed?
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  #52  
Old 02-16-2018, 12:01 PM
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Gap on new plug looks wrong what do you think Ed?
I hope not, I measured them all to 35 thousandths last week
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  #53  
Old 02-16-2018, 12:09 PM
Peter Grave Peter Grave is online now
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Hard to tell form picture like a Dr. wanated second opinion.
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  #54  
Old 02-16-2018, 10:06 PM
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Now the key when your looking at plugs it to see how they are burning. If they are fouling ore have a oil build up. The tip of that one you show looks to be a normal burning plug.
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  #55  
Old 02-16-2018, 10:25 PM
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Gaping plugs is a learned thing. Now your looking at a angle on it but if you hold it square in front of you the ground strap should be square with the power tip. I would say that one is at a angle. If it is the spark will jump to the low spot and fire off center. Now the 70 is the second highest compression in the 472 line up so one most likly will not notice one not firing as good as it could. But one should run the new plugs a month or so and pull them to see how they look. If they are all burning clean then if things are good regap and enjoy the new car.
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  #56  
Old 02-17-2018, 01:14 AM
Paul Steinberg Paul Steinberg is offline
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The plug on the right is an older Autolite plug, and it appears that you have a valve cover leak. Get some dielectric grease, and put a light smear on each of the plug porcelains as you replace the plug wires. It will make it easier to get the plugs wires off the next time. Also keeps moisture from causing a poor plug connection.
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  #57  
Old 02-19-2018, 11:16 AM
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A good amount of the old plugs the tip was burned white. Also several of old ones were bent down, almost looks like whoever put them in banged them against the block on accident as they put them in, bending them.

So over the weekend heres all I did:

- 8 new spark plugs
- 8 new spark plug wires (with boot grease and dialectric on the threads)
- 5oz seafoam in the crankcase
- 11oz seafoam in gas tank
- Full can of Seafoam top engine cleaner straight down the carb while pulling the throttle around 1500.

Before the seafoam my engine would shake aggressively at idle. 10 min after the seafoam it stopped shaking and was running alot smoother. So it did help some

I've driven twice so far since and so far there has been no throttle cutting or hesitation, BUT these are new plugs and they might not have had time to foul yet, so im not going to get my hopes up.

Heres how it runs after:

https://www.youtube.com/watch?v=deU8bclkJS0
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  #58  
Old 02-19-2018, 11:30 AM
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Putting the grease on the threads is not necessary. What you are experiencing is setting problems. Carbon build in with short runs. The sea foam has helped to pass it threw the systen. Drive it, thats what it needs. Not long idle time but a trip out were you can get it up to speed for some time.
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  #59  
Old 02-19-2018, 11:42 AM
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Quote:
Originally Posted by John ED Renstrom View Post
Putting the grease on the threads is not necessary. What you are experiencing is setting problems. Carbon build in with short runs. The sea foam has helped to pass it threw the systen. Drive it, thats what it needs. Not long idle time but a trip out were you can get it up to speed for some time.
Yeah I'm going to drive it to work tomorrow which is around 15 miles. I had no idea that plug was indicative of a bad valve cover gasket. Googled after I read Paul's comment and I see now. I'm going to add that to my list of things to take care of asap.

My top two items I need to address now are my driver-front brakes squealing and now this valve cover.
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Old 02-19-2018, 02:44 PM
Paul Steinberg Paul Steinberg is offline
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Squeeling brakes trumps all other problems. Fix this first, or at least determine what is the root of the squeeling issue.
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