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Engine should die, right? #1168289
01/30/12 12:36 AM
01/30/12 12:36 AM
Joined: Jan 2003
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Scottsdale, AZ
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kenz Offline OP
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Scottsdale, AZ
If you cover the carb on a running engine, it should die, right? The 318 in our 73 Duster will keep running when we cover the carb with a cloth. 2
We've been having problems getting it running correctly. It's a rebuilt engine with a new Edelbrock carb and manifold. We've tried 2 different manifolds and 2 different carbs, all new. We've tried spraying carb cleaner all over the carb and manifold while running and it has no effect. So where is it getting air from?
Any ideas?
Thanks,
Ken


Mopars Unlimited of Arizona
www.moparsaz.com
Re: Engine should die, right? [Re: kenz] #1168290
01/30/12 12:38 AM
01/30/12 12:38 AM
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Scottsdale, AZ
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kenz Offline OP
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I just realized I posted this in the wrong forum. Could a moderator move it?
sorry.

Re: Engine should die, right? [Re: kenz] #1168291
01/30/12 01:09 AM
01/30/12 01:09 AM
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Lincoln Nebraska
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RapidRobert Offline
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More detailed info: when did it start, any part changes preceding it acting up, was it right at one time. You're in the right forum unless you're saying you had a prior thread on this somewhere else & I doubt if the mods will move it, we'll fix it for you!


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Re: Engine should die, right? [Re: RapidRobert] #1168292
01/30/12 01:23 AM
01/30/12 01:23 AM
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albany ny
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05dakota Offline
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big vacum leak

Re: Engine should die, right? [Re: 05dakota] #1168293
01/30/12 01:39 AM
01/30/12 01:39 AM
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Eugene, Oregon
Secret Chimp Offline
super stock
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Eugene, Oregon
Cracked/leaking PCV hose?


1967 Dodge Coronet Deluxe station wagon

1.03" T-bars, QA1 arms/rods, Cordoba/GM Metric/Volare brake & knuckle, XHDs, Hellwig rear sway, 318 Magnum w/ air gap, 727, 3.23s
Re: Engine should die, right? [Re: Secret Chimp] #1168294
01/30/12 01:55 AM
01/30/12 01:55 AM
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Fresno, CA
Jim_Lusk Offline
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Possible bad brake booster. Disconnect ALL external vacuum lines, including vacuum advance and plug the sources......

Re: Engine should die, right? [Re: 05dakota] #1168295
01/30/12 06:13 PM
01/30/12 06:13 PM
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Surface of the SUN
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newvcode Offline
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Quote:

big vacum leak




No doubt!!! Also check throttle plates and rod bushings... shoot some WD40 in the bushing sides if it revs.... they're toast.

Re: Engine should die, right? [Re: kenz] #1168296
01/30/12 06:25 PM
01/30/12 06:25 PM
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Lincoln Nebraska
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RapidRobert Offline
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Change the intake gaskets & get the composition ones & use Permatex "high tack" the red stuff in a spray can & use a thick/wide carefully placed swath of clear silicone on the front/rear rails in place of the gaskets letting it sit up overnight as the supplied front/rear gaskets can be too thick but if a massive vac leak it'd have to be an intake/head interface gasket/alignment prob I'd think


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Re: Engine should die, right? [Re: RapidRobert] #1168297
01/30/12 09:41 PM
01/30/12 09:41 PM
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Scottsdale, AZ
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kenz Offline OP
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The engine has never run correctly. We bought a rebuilt long block and have been trying to get it running. Here's what has been done so far.

1- Started with a new Edelbrock Performer manifold and 600 cfm carb.

2- Changed the carb to a new Edelbrock 650 cfm

3- Changed manifold to a new Weiand Action Plus

Intake gaskets are Fel-Pro composite with a light coating of RTV and RTV on the end rails. Throughout all of this all vacuum lines are disconnected and plugged. We've sprayed carb cleaner all over the carb and manifold while the engine is running after each change. There is no change in the idle so I can't see how it's pulling air from outside the engine.

I suspect an intake manifold to head mismatch but since we've tried 2 different brand new manifolds I'm beginning to think there is something wrong with one or both heads. There's nothing else it could be, is there?

Thanks,
Ken


Mopars Unlimited of Arizona
www.moparsaz.com
Re: Engine should die, right? [Re: kenz] #1168298
01/30/12 09:46 PM
01/30/12 09:46 PM
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Posts: 245
Western PA
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OldMoparMan Offline
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Does it have an EGR valve or similar smog valve if so check it or plug the lines off and try running the engine


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Re: Engine should die, right? [Re: kenz] #1168299
01/30/12 10:21 PM
01/30/12 10:21 PM
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Lincoln Nebraska
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RapidRobert Offline
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Quote:

The engine has never run correctly.


Might switch gears & check true TDC on the dampener & dont remem if you mentioned what it is timed at. rotor phasing acceptable. EGR closed. Kind of WAG ing here. I enjoy 318's, wish I was closer to give you a hand


live every 24 hour block of time like it's your last day on earth
Re: Engine should die, right? [Re: RapidRobert] #1168300
01/30/12 10:36 PM
01/30/12 10:36 PM
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Scottsdale, AZ
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kenz Offline OP
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Quote:

Quote:

The engine has never run correctly.


Might switch gears & check true TDC on the dampener & dont remem if you mentioned what it is timed at. rotor phasing acceptable. EGR closed. Kind of WAG ing here. I enjoy 318's, wish I was closer to give you a hand





We verified tdc and degreed the cam to make sure everything was correct. Plus it was a good learning experience for my son. :-)

The timing is set at 18 degrees btdc.
There is no egr.

Not sure about rotor phasing but I forgot to mention that we tried both a rebuilt stock distributor and a MP unit. Made no difference.

We've spent so much trying new parts that I guess we should have just bought a crate motor. :-(

Thanks again for the help.
Ken


Mopars Unlimited of Arizona
www.moparsaz.com
Re: Engine should die, right? [Re: kenz] #1168301
01/30/12 10:42 PM
01/30/12 10:42 PM
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Lincoln Nebraska
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RapidRobert Offline
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Sure is pointing to a vac leak. We're gonna laugh when we find it


live every 24 hour block of time like it's your last day on earth
Re: Engine should die, right? [Re: kenz] #1168302
01/31/12 09:10 PM
01/31/12 09:10 PM
Joined: Sep 2007
Posts: 14,889
up yours
Supercuda Offline
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Quote:

If you cover the carb on a running engine, it should die, right? The 318 in our 73 Duster will keep running when we cover the carb with a cloth.




CLOTH? gonna keep running. The cloth is essentially an air filter.


They say there are no such thing as a stupid question.
They say there is always the exception that proves the rule.
Don't be the exception.
Re: Engine should die, right? [Re: Supercuda] #1168303
01/31/12 10:06 PM
01/31/12 10:06 PM
Joined: Jan 2003
Posts: 559
Scottsdale, AZ
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kenz Offline OP
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kenz  Offline OP
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Quote:

Quote:

If you cover the carb on a running engine, it should die, right? The 318 in our 73 Duster will keep running when we cover the carb with a cloth.




CLOTH? gonna keep running. The cloth is essentially an air filter.




I used a shop rag with my hands over it just to be sure. I'm fairly certain no air was getting into the top of the carb. :-)


Mopars Unlimited of Arizona
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