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Re: 383man
[Re: GregCon]
#747778
07/14/10 08:38 AM
07/14/10 08:38 AM
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Joined: May 2004
Posts: 679
N.E Indiana
repad
OP
super street
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OP
super street
Joined: May 2004
Posts: 679
N.E Indiana
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Quote:
I just doubt an intake leak could cause that level of misfire - you'd need a big leak to entirely prevent the cylinder from hitting. And, how would you blow out a metal gasket? Or are you using those thin paper gaskets too?
What else other than the items that I checked could cause the dead cylinder? I'm not using anything but the metal valley pan with unblocked heat crossover and silicone sealant.
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Re: Attn engine builders need help troubleshooting 383
[Re: 383'D]
#747779
07/14/10 08:42 AM
07/14/10 08:42 AM
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Joined: May 2004
Posts: 679
N.E Indiana
repad
OP
super street
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OP
super street
Joined: May 2004
Posts: 679
N.E Indiana
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Quote:
Look at the the springs on that cylinder real good for a broken coil.It may look like a hairline crack. Does it smell rich when it runs?Mine ended up being a exhaust spring on #4.Even though almost new.It acted just like that.
I have inspected the springs but will take a closer look. Wouldn't the good compression test rule out a broken spring?
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Re: Attn engine builders need help troubleshooting 383
[Re: repad]
#747780
07/14/10 08:43 AM
07/14/10 08:43 AM
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Joined: Feb 2005
Posts: 28,312
Cincinnati, Ohio
Challenger 1
Too Many Posts
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Too Many Posts
Joined: Feb 2005
Posts: 28,312
Cincinnati, Ohio
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Quote:
Quote:
Might be a bad ignition box. I had a brand new MSD box that wouldn't fire #1 and #4.
Sorry, no ignition box, running on points.
It sounds like you need to adjust the dwell. Have you checked that?
Since you said it still back fires sometimes I bet your points are off, what's the dwell?
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Re: Attn engine builders need help troubleshooting 383
[Re: Challenger 1]
#747781
07/14/10 08:47 AM
07/14/10 08:47 AM
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Joined: May 2004
Posts: 679
N.E Indiana
repad
OP
super street
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OP
super street
Joined: May 2004
Posts: 679
N.E Indiana
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Quote:
Quote:
Quote:
Might be a bad ignition box. I had a brand new MSD box that wouldn't fire #1 and #4.
Sorry, no ignition box, running on points.
It sounds like you need to adjust the dwell. Have you checked that?
Since you said it still back fires sometimes I bet your points are off, what's the dwell?
I set the dwell at 29.
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Re: Attn engine builders need help troubleshooting 383
[Re: repad]
#747782
07/14/10 08:54 AM
07/14/10 08:54 AM
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Joined: Jun 2010
Posts: 798
Houston TX
GregCon
super stock
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super stock
Joined: Jun 2010
Posts: 798
Houston TX
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If there's good spark it doesn't matter what the dwell is.
Does the plug look bone dry or does it look like it is getting washed with some gas?
Again, if you have some gas, air, compression and spark in time it is going to fire. Which is missing?
Just for kick what firing order are you using?
Last edited by GregCon; 07/14/10 08:55 AM.
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Re: Attn engine builders need help troubleshooting 383
[Re: GregCon]
#747783
07/14/10 09:02 AM
07/14/10 09:02 AM
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Joined: May 2004
Posts: 679
N.E Indiana
repad
OP
super street
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OP
super street
Joined: May 2004
Posts: 679
N.E Indiana
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Quote:
If there's good spark it doesn't matter what the dwell is.
Does the plug look bone dry or does it look like it is getting washed with some gas?
Again, if you have some gas, air, compression and spark in time it is going to fire. Which is missing?
Just for kick what firing order are you using?
The plug looks very dry with a silght gas odor which tells me that it is not getting a proper shot of fuel. Firing order 18436572
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Re: Attn engine builders need help troubleshooting 383
[Re: repad]
#747785
07/14/10 09:36 AM
07/14/10 09:36 AM
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Joined: Jan 2003
Posts: 667
CA
66Dodge
super gas
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super gas
Joined: Jan 2003
Posts: 667
CA
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Quote:
Quote:
If there's good spark it doesn't matter what the dwell is.
Does the plug look bone dry or does it look like it is getting washed with some gas?
Again, if you have some gas, air, compression and spark in time it is going to fire. Which is missing?
Just for kick what firing order are you using?
The plug looks very dry with a silght gas odor which tells me that it is not getting a proper shot of fuel. Firing order 18436572
1). Check the valve train to see what would cause #3 intake valve to not open properly. (compression good because it stays closed okay, but will not open properly)
2). Just for kicks try a diffrerent dist. cap. (bad contact on terminal #3 could be missing link in spark path)
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Re: Attn engine builders need help troubleshooting 383
[Re: 66Dodge]
#747786
07/14/10 10:18 AM
07/14/10 10:18 AM
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Joined: Jan 2003
Posts: 667
CA
66Dodge
super gas
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super gas
Joined: Jan 2003
Posts: 667
CA
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Quote:
Quote:
Quote:
If there's good spark it doesn't matter what the dwell is.
Does the plug look bone dry or does it look like it is getting washed with some gas?
Again, if you have some gas, air, compression and spark in time it is going to fire. Which is missing?
Just for kick what firing order are you using?
The plug looks very dry with a silght gas odor which tells me that it is not getting a proper shot of fuel. Firing order 18436572
1). Check the valve train to see what would cause #3 intake valve to not open properly. (compression good because it stays closed okay, but will not open properly)
2). Just for kicks try a diffrerent dist. cap. (bad contact on terminal #3 could be missing link in spark path)
Okay, we've covered all the basic things that a cylinder needs to fire/combust. Time think outside the box and to look at the weird things that could have happened.
3). Inspect cam lobes in the dist. (worn cam lobe will not close the points all the way, thus no charging of the coil before the points open again)
4). Check for some sort of obstruction in the intake path/runner to cyl.#3. (maybe the ball of aluminum foil was stuffed into intake runner #3 instead of the heat crossover opening ? LOL) (that's why the carb backfired big time ?)
5). Verify you actually saw a spark jump when #3 boot is held close to ground while cranking the engine ?
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