Author Topic: fouling plugs  (Read 4302 times)

Offline sprecks

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Re: fouling plugs
« Reply #15 on: October 18, 2010 - 11:30:55 AM »
It would be interesting to see if there were a significant difference in the resistance of a plug wire that was fouling compared to a similar length wire from one that is not fouling.

That's another good thought. I'll check the resistance of the wires when I get home tonight.
you can call me Jay
I've seen sicker dogs get well.

1971 Challenger Vert - 472 Hemi EFI
1969 Road Runner 440/Auto
2017 Ram Laramie 1500 - Hemi




Offline sprecks

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Re: fouling plugs
« Reply #16 on: October 18, 2010 - 06:17:30 PM »
here's what I found today in regards to the wire resistance:
#1 clean 12K ohms
#2 clean 7K ohms
#3 clean 15K ohms
#4 fouled 10K ohms
#5 clean 16K ohms
#6 fouled 10K ohms
#7 fouled 12K ohms
#8 fouled 10K ohms
Jason and Al got me thinking about the intake so I also pulled the carbs off to look inside of the intake. Maybe this is the problem. Does it look like this intake has been modified. I'm not a Hemi expert by any stretch. Does this look right or has it had some milling done to it under the carb area.
you can call me Jay
I've seen sicker dogs get well.

1971 Challenger Vert - 472 Hemi EFI
1969 Road Runner 440/Auto
2017 Ram Laramie 1500 - Hemi

Offline sprecks

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Re: fouling plugs
« Reply #17 on: October 18, 2010 - 06:19:00 PM »
Here's a picture of the plugs after 70 miles. soory it is a little blurry but you can clearly see the difference between the clean and fouled plugs.
you can call me Jay
I've seen sicker dogs get well.

1971 Challenger Vert - 472 Hemi EFI
1969 Road Runner 440/Auto
2017 Ram Laramie 1500 - Hemi

Offline sprecks

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Re: fouling plugs
« Reply #18 on: October 18, 2010 - 06:21:57 PM »
here's another picture of the intake
you can call me Jay
I've seen sicker dogs get well.

1971 Challenger Vert - 472 Hemi EFI
1969 Road Runner 440/Auto
2017 Ram Laramie 1500 - Hemi

Offline Bullitt-

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Re: fouling plugs
« Reply #19 on: October 18, 2010 - 07:14:59 PM »
here's what I found today in regards to the wire resistance:
#1 clean 12K ohms
#2 clean 7K ohms
#3 clean 15K ohms
#4 fouled 10K ohms
#5 clean 16K ohms
#6 fouled 10K ohms
#7 fouled 12K ohms
#8 fouled 10K ohms

I don't not see any pattern but the difference from the highest to lowest is extreme. I would expect the least resistance from the shorter & more from the longer so #1 & 3 blows my theory being higher resistance & clean plugs. 
Wade  73 Rallye 340..'77 Millennium Falcon...13 R/T Classic   Huntsville, AL
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Offline sprecks

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Re: fouling plugs
« Reply #20 on: October 18, 2010 - 07:25:40 PM »
I don't not see any pattern but the difference from the highest to lowest is extreme. I would expect the least resistance from the shorter & more from the longer so #1 & 3 blows my theory being higher resistance & clean plugs.
Thanks for the input. Even though the theory didn't pan out I think I probably need a new set of wires. I'll order a set tonight to eliminate them as the problem.
you can call me Jay
I've seen sicker dogs get well.

1971 Challenger Vert - 472 Hemi EFI
1969 Road Runner 440/Auto
2017 Ram Laramie 1500 - Hemi

Offline Moparal

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Re: fouling plugs
« Reply #21 on: October 18, 2010 - 08:55:30 PM »
How was the idle?  Hard to tell from the pics, but the gaskets look like maybe they were sucking air up under the carb. Front carb, back of gasket and rear carb back of gasket. Is it the pic or me?  The maybe air leaks would affect those cylinders that are fouling.  I just can't tell. I know Nick sold me some firecore wires that mad a night/day difference .   Are the air/fuel mixtures set with a vacuum gauge?   I just am not sure at this point

Offline Chryco Psycho

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Re: fouling plugs
« Reply #22 on: October 19, 2010 - 01:47:32 AM »
 :iagree:
the manifold looks modified

Challenger - You`ll wish You Hadn`t

Offline mopar12372

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Re: fouling plugs
« Reply #23 on: October 19, 2010 - 02:29:05 AM »
http://www.streetrodandperformance.com/images/edl-7501.jpg this duel plane manifold has a wall up the middle with a notch cut out if this helps . what manifold are you using ? a duel plane manifold should be pretty damn close as far as air fuel mixture .
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Offline sprecks

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Re: fouling plugs
« Reply #24 on: October 19, 2010 - 07:39:11 AM »
I can't remember where I got the intake from. I've had it for 15 years or more. It is an original hemi piece with the pentastar and casting numbers. I agree with you guys though. After comparing mine with reproduction intakes on e-bay, my manifold is definitely modified. I guess I'll have to bite the bullet and get a new intake now. Here's the one on e-bay.

http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&item=230501315652&viewitem=&_trkparms=algo%3DLVI%26its%3DI%26otn%3D2&category=36474
you can call me Jay
I've seen sicker dogs get well.

1971 Challenger Vert - 472 Hemi EFI
1969 Road Runner 440/Auto
2017 Ram Laramie 1500 - Hemi

Offline mopar12372

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Re: fouling plugs
« Reply #25 on: October 19, 2010 - 03:13:43 PM »
dang thats the same manifold!!
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Offline sprecks

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Re: fouling plugs
« Reply #26 on: October 19, 2010 - 08:35:00 PM »
I ordered a new intake manifold tonight. Should have it next week. Any luck and this will get the problem close to being fixed.
Anyone need a cheap "slightly" modified intake manifold?......lol
you can call me Jay
I've seen sicker dogs get well.

1971 Challenger Vert - 472 Hemi EFI
1969 Road Runner 440/Auto
2017 Ram Laramie 1500 - Hemi

Offline mopar12372

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Re: fouling plugs
« Reply #27 on: October 20, 2010 - 12:33:41 AM »
 :bigsmile:
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