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Re: One plug not firing
neilroy #471823 Sat Nov 15 2008 10:28 PM
Joined: Jun 2004
Posts: 8,192
Master Gabster
First find out wether you have spark to that cyl. or not. If not check the point gap. like TRK says sometimes a dist shaft is worn or bent enough that if the points are gapped too close one cyl will be the first to missfire. If you havn't replaced the cap it can be a hairline carbon track it it that may be very hard to find or may not show up at all.

They say money can't buy happiness. It can buy old Chevy trucks though. Same thing.

1956 Chevy 1/2-Ton Pickup

Re: One plug not firing
neilroy #471899 Sun Nov 16 2008 02:49 AM
Joined: Nov 2008
Posts: 5
New Guy

I'm going to go by the local flea mkt tomm and see if I can find a deal on a gauge if not will check local parts stores for price..I guess it would be good to take a spare plug with me so I can get the right threads? anybody know what the ballpark reading should be?

anyway did the arc test tonite after it got dark...couldn't see any errant sparks and did the screwdriver test for fire...the plug wire does in fact have spark...must be a valve or compression issue...bummer...

anybody have any idea what a full valve job should run $$ wise as opposed to having an engine re-build kit put in? seems like if there's a stuck or burned valve on an eng this old I can't see the others being in great shape...



Re: One plug not firing
71DuallyFB #471900 Sun Nov 16 2008 02:51 AM
Joined: Feb 2008
Posts: 207
Wrench Fetcher
i have a small block 400 that had a broken rocker.

Last edited by 47chevy6400; Sun Nov 16 2008 02:52 AM.
Re: One plug not firing
neilroy #472033 Sun Nov 16 2008 01:21 PM
Joined: Oct 2008
Posts: 91
Wrench Fetcher
could be the dist cap. That one contact may not be making contact. You should be able to pull that wire a little bit with it running and hear it arching. Worth a shot.

Re: One plug not firing
excellant_62 #472390 Tue Nov 18 2008 03:50 AM
Joined: Jul 2005
Posts: 597
Shop Shark
take a extra plug, put it on the end of #7 plug wire,ground plug and check for spark. if no spark you have bad/broken plug wire. you can also ohm out plug wire (check for resitance)

Re: One plug not firing
10 micron #472456 Tue Nov 18 2008 05:15 AM
Joined: Nov 2008
Posts: 5
New Guy
thanks guys...I did the spark test and it appears there is fire...I tried to get a compression gauge yesterday at the flea mkt but the only one I could find was pretty old and ate up looking..prolly wouldn't work...

I think the next thing I may try is pulling the valve cover and seeing if I can see the rockers moving as they should...if they are I would think maybe burnt valve(s)?

any other suggestions well appreciated...



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