How did my plugs get this ugly -Now with head removed
#2693267
08/31/19 09:01 PM
08/31/19 09:01 PM
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Joined: Nov 2006
Posts: 2,252 IL
furious70
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EFI turbo charged 383.
EFI'ed since 2009 and the plugs have all 8 always been very similar, dry, tan (I didn't take any photos of the good ones, I should have)
turbocharged in 2012.
I've had the plugs out various times over the last decade and the plugs have always looked good.
This year the idle quality and general performance has been lackluster after largely sitting around in our heated shop the prior 2 years since I had my Charger out here.
Took the plugs out today and found 1 really oily wet one and 3 with hard deposits on them - is it coked up oil or what?
What would cause a change this drastic in 500-1000 miles of street fun?
Last edited by furious70; 09/08/19 10:38 PM.
70 Sport Fury 68 Charger 69 Coronet 72 RR
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Re: How did my plugs get this ugly in relatively few miles?
[Re: furious70]
#2693283
08/31/19 10:35 PM
08/31/19 10:35 PM
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Joined: Jan 2005
Posts: 2,540 Milwaukee WI
TRENDZ
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Posts: 2,540
Milwaukee WI
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Weren’t you having blow-by problems last year? Id say you have a ring issue. It was you with the valley pan leak correct?
"use it 'till it breaks, replace as needed"
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Re: How did my plugs get this ugly in relatively few miles?
[Re: squirrel]
#2693290
08/31/19 10:54 PM
08/31/19 10:54 PM
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Joined: Nov 2006
Posts: 2,252 IL
furious70
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no blow by that I've noticed, but the valley pan was leaking oil and audible vacuum leak that I did fix over the winter with a new pan. Heads don't have that many miles on them so I'd hope the seals are ok. It's had plenty of fuel run through it when I've had it out here, longest time it ever sat was over winters like it always has with stabil in the tank. 1 & 2 were clean. 8 was pretty good. 4 was the worst, 3, 5, 6, 7 were all about the same. 4 is the one pictured with the huge deposit on it. It has an rpm perf manifold converted for EFI. Like I said, prior to this the plugs have all looked incredibly equal so distribution with that intake converted seemed good. I had a spare set of plugs so I threw them in because I was planning on driving it today but some rain came up on the radar. Not surprising, but idling in the driveway with new plugs it seemed happier Next step a compression test on those bad holes? Been looking for an excuse to put a 5.7/nag1 in it
Last edited by furious70; 08/31/19 10:55 PM.
70 Sport Fury 68 Charger 69 Coronet 72 RR
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Re: How did my plugs get this ugly in relatively few miles?
[Re: squirrel]
#2693292
08/31/19 11:00 PM
08/31/19 11:00 PM
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Joined: Mar 2003
Posts: 9,091 Rogue River, OR
Jeremiah
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Time for a leak down, or at very least compression check + pull a rocker cover.
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Re: How did my plugs get this ugly in relatively few miles?
[Re: furious70]
#2693335
09/01/19 04:56 AM
09/01/19 04:56 AM
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Joined: Jan 2005
Posts: 2,540 Milwaukee WI
TRENDZ
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master
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Milwaukee WI
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Where was the oil leak source? Port opening, front/ rear rail or cracked pan? I would say either you have a ring issue, or the valley pan isn’t sealed very well at that port. The fact that you had an audible vacuum leak previous to replacing the pan would have me sending a camera down that port looking for an oil trail, or poor pan/ port alignment. Are you running a pan only, or gasket/pan layers?
"use it 'till it breaks, replace as needed"
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Re: How did my plugs get this ugly in relatively few miles?
[Re: TRENDZ]
#2693341
09/01/19 07:30 AM
09/01/19 07:30 AM
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Joined: Jan 2003
Posts: 8,005 Tulsa OK
Bad340fish
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Tulsa OK
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Might be time to get your injectors flowed and cleaned?
68 Barracuda Formula S 340 87 "Chrysler" Conquest
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Re: How did my plugs get this ugly in relatively few miles?
[Re: Bad340fish]
#2693342
09/01/19 07:44 AM
09/01/19 07:44 AM
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Joined: Nov 2006
Posts: 2,252 IL
furious70
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I had oil collecting on the pan and on the back of the block by the sender, both of which stopped with the r&r on the pan. Using carb cleaner to test I had leaks on the outside of 3&5 for sure. I didn't have a way to shoot carb cleaner in underneath at the ports, but I had assumed that 3&5 were probably leaking on the underside as well then. The passenger side bank seemed ok as far as vacuum leaks, but had the worst plugs.
Only the pan with RTV, it was too thick with the gaskets, I could not get it to go together.
For the general rough idle someone else suggested injector service (but then I found the plugs). I luckily have a new set of these ancient 37# delphi's I'm using so I could throw some in, but what about dirty injectors would contribute to this?
Last edited by furious70; 09/01/19 07:46 AM.
70 Sport Fury 68 Charger 69 Coronet 72 RR
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Re: How did my plugs get this ugly in relatively few miles?
[Re: furious70]
#2693344
09/01/19 07:58 AM
09/01/19 07:58 AM
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Joined: Jan 2003
Posts: 8,005 Tulsa OK
Bad340fish
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master
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dribbling fuel or leaking, poor spray pattern? I plan on making an injector service part of my yearly tune up but I have yet to actually follow through with that lol.
68 Barracuda Formula S 340 87 "Chrysler" Conquest
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Re: How did my plugs get this ugly in relatively few miles?
[Re: Hot 340]
#2693524
09/01/19 09:34 PM
09/01/19 09:34 PM
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Joined: Nov 2006
Posts: 2,252 IL
furious70
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Turbo seals would be a major bummer since they are nice Precision units with not very many miles on them. No oil in the intake tract from the turbos to the throttle body either, though I'll keep an eye on that.
Borrowed a borescope and comp tester from Autozone
2,4,6 all had about 120psi, could not get the hose onto 8 without taking my downpipe off. Did not have time to get to the dr's side, but the pass side had the worst plugs. #2 was 122psi and #6 was 118psi, within the range of error of the tool I was using and that was the worst plug and best plug on that bank.
borescope showed lots of build up, looked like a sticky tar pit, and maybe some cratering from detonation, you guys tell me. Photo also of the edge of a piston. 4 and 6 had this nasty looking edge condition on part of them and then the other side was cleaner.
70 Sport Fury 68 Charger 69 Coronet 72 RR
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Re: How did my plugs get this ugly in relatively few miles?
[Re: furious70]
#2693531
09/01/19 09:57 PM
09/01/19 09:57 PM
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Joined: Nov 2006
Posts: 2,252 IL
furious70
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Also, I couldn't get a 360* view with the borescope but in each of the cylinders I was able to still see cross hatch and did not see any vertical scarring in the areas I was able to see.
70 Sport Fury 68 Charger 69 Coronet 72 RR
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Re: How did my plugs get this ugly in relatively few miles?
[Re: Roughbird72]
#2693689
09/02/19 05:01 PM
09/02/19 05:01 PM
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Joined: Nov 2006
Posts: 2,252 IL
furious70
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I don't view it as the hard way. It's a random cast piston 383 with unknown miles on it and of questionable integrity. I got 7 years of fooling around with my first scratch built turbo kit and efi with it. I think it had a really good run actually. I will admit that with the efi, a conservative tune for fuel and timing, always 93 octane, and water injection once I went past 5psi, I did not expect to detonate it. I should have been doing routine plug reading in order to more closely isolate when it happened however. And I learned that I need to make sure a turbo kit has room to get a compression tester in each bore without having to take stuff apart if I can.
70 Sport Fury 68 Charger 69 Coronet 72 RR
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