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10-20-2015, 05:52 PM
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#1 |
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Registered User
 Join Date: Sep 2001
Location: Ontario New Yak
Posts: 843
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Alien object in intake port
The 250 in my 68 K10 always had a random misfire at lower rpm's. It would come and go...
Today I'm preparing to pull the engine for a 292 replacement so I remove the intake and found this inside...The hammered closed end was towards the valve and the port floor was clean from the tube knocking around.... 
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10-21-2015, 01:05 PM
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#2 |
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Registered User
Join Date: Dec 2009
Location: Atlanta, Ga.
Posts: 1,050
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Re: Alien object in intake port
Would that be part of a valve stem?
__________________
I don't think we get smarter as we get older. We just run out of Stupid things to do. |
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10-21-2015, 03:58 PM
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#3 |
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Registered User
Join Date: May 2015
Location: Edmonton,Alberta, Canada
Posts: 103
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Re: Alien object in intake port
I had a similar situation with my '65 Belair and its 230. I had changed the head and intake together(long story) anyway about 6 months latter when I removed the intake to install new gaskets I found one of the carb nuts sitting beside the no. 4 intake valve. Surprisingly no damage or problems were caused by it.
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10-21-2015, 06:44 PM
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#4 |
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Registered User
Join Date: Oct 2014
Location: Mesa AZ (Near Phoenix)
Posts: 2,302
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Re: Alien object in intake port
"Why, that's a nick knack Patty Black. Give the frog a loan".
Serious though, it kinda looks like it could have started life as a tube under the air filter that got dislodged and your motor ate it.
__________________
"Life is too short to drive a boring vehicle". Later, Wayne 
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10-21-2015, 08:21 PM
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#5 |
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Registered User
Join Date: Jul 2010
Location: MD
Posts: 1,937
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Re: Alien object in intake port
That is an anti-carbonator. Keeps deposits from forming on the back of the intake valve.
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10-21-2015, 08:23 PM
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#6 |
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Registered User
Join Date: May 2011
Location: Northern Calif.
Posts: 3,776
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Re: Alien object in intake port
Kinda looks like a piece of metal fuel line.
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10-22-2015, 06:22 AM
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#7 |
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Registered User
Join Date: Sep 2001
Location: Ontario New Yak
Posts: 843
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Re: Alien object in intake port
I was told it's the PVC extension pipe....A short length of tubing that extends into the intake manifold and curves away from the 3-4 intake port...Supposedly the PCV could cause the enter cylinders to run lean...
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10-22-2015, 09:34 AM
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#8 |
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Registered User
Join Date: Feb 2015
Location: Mancos,CO
Posts: 101
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Re: Alien object in intake port
2 summers ago I had to replace the intake gaskets on my 98 gmc. got the manifold off and there was a stick about the same size and length just laying in the lifter valley! I am the second owner of the truck and was friends with the previous owner. he never had the manifold off. must have came from the factory in there!
__________________
Brian |
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10-22-2015, 04:13 PM
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#9 |
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Registered User
Join Date: Oct 2005
Location: Overland Park, Ks.
Posts: 5,229
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Re: Alien object in intake port
I agree. There is a short tube like that inside the center intake port. It draws vacuum from under the carb instead of from the 3-4 intake runner. It would cause a rough idle without it.
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