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#8 cylinder not firing at idle

Forum: C3 Engines, Driveline and Handling

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#8 cylinder not firing at idle

Posted: 9/19/06 6:48pmMessage 21 of 30
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kstyer
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CUYAHOGA FALLS, OH - USA
Joined: 12/2/2003
Posts: 6424
Vette(s): 1975 C3 Red, T-Tops, Black Interior. All I need is time and money! Getting there!
Just curious Bill.  What test did you use to determine the wires and cap are good?   Some test are tricky, and can fool you.
On the "Tail of the Dragon"
(some day, no strike that, October 2008 it turned red, still in progress!)

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#8 cylinder not firing at idle

Posted: 9/20/06 5:46amMessage 22 of 30
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Bill427
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Hagerstown, MD - USA
Joined: 8/12/2006
Posts: 17
Vette(s): 1968 427 vert, BB. Auto, PW, PS, and PB.
I bought new ones.

I'm wondering if the idle circuit in the carb is clogged up.  Not this weekend, but next i will have another to try out.
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#8 cylinder not firing at idle

Posted: 9/20/06 9:54amMessage 23 of 30
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Adams' Apple
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Duncanville, TX - USA
Joined: 11/8/2003
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Vette(s): #1-1974 L-48 4spd Cp Med Red Metallic/Black deluxe int w/AC/tilt/tele./p/w-p/b/ Am-Fm/map light National/Regional/Chapter NCRS "Top Flight" #2-1985 Bright Red/Carmine Cp.L-98/auto Member: NCRS, NCRS Texas, Corvette Legends of Texas
That's a possibility, but why only #8 cyl not firing? There are three other cyls on air/fuel supply side of the manifold. Weird, eh?

Joel Adams
C3VR Lifetime Member #56    
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#8 cylinder not firing at idle

Posted: 9/20/06 11:29amMessage 24 of 30
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windrider1200
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Clifton, NJ - USA
Joined: 10/3/2003
Posts: 142
Vette(s): 1972 Coupe Ontario Orange Black leather interior LS-5; Turbo 400
Isn't there a vac port screwed into the manifold in the #8 runner?
 
Could be that what ever is attached to that port has a leak, forcing #8 to run lean.
 
On my 72 BBC, the Power Brake booster diaphram developed a leak, and I think it was # 8 that was running leaner then the rest of the pugs, after a visual comparison.
 
Just a thought.
 
BB NJ Ken

1972 T Top 454; "Boomer" Latest "upgrades": 1 1/8" front Stabilizer bar. Rebuilt SS calipers with O-ring pistons. Under car Chambered exhaust. Fiberglass rear spring (360lbs/in). Bilstein Rear Shocks. 3/4" Rear Stabilizer Bar. Tow hitch. Performer manifold with 600 cfm Holley. Comp Cam 262 .499 lift. L-88 Hood in process

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#8 cylinder not firing at idle

Posted: 10/5/06 6:21amMessage 25 of 30
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windrider1200
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Vette(s): 1972 Coupe Ontario Orange Black leather interior LS-5; Turbo 400
Bill;
 
Any news on the cause of the mis-fire, or did I miss a new thread?
 
BB NJ Ken

1972 T Top 454; "Boomer" Latest "upgrades": 1 1/8" front Stabilizer bar. Rebuilt SS calipers with O-ring pistons. Under car Chambered exhaust. Fiberglass rear spring (360lbs/in). Bilstein Rear Shocks. 3/4" Rear Stabilizer Bar. Tow hitch. Performer manifold with 600 cfm Holley. Comp Cam 262 .499 lift. L-88 Hood in process

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#8 cylinder not firing at idle

Posted: 10/6/06 1:45pmMessage 26 of 30
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jbox1
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i had my 68 that i just bought in the shop last week, and they said 4 of mine weren't firing.  they adjusted the valves, and got them all to fire.  same as yours, they would fire at higher rpm's, just not at low rpm.
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#8 cylinder not firing at idle

Posted: 10/10/06 6:59amMessage 27 of 30
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Bill427
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Hagerstown, MD - USA
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Posts: 17
Vette(s): 1968 427 vert, BB. Auto, PW, PS, and PB.
Here is the update.  I got a new carb built by BIGS performance, holley 780 CFM vacuum secondary's, it runs great.  I guess the idle circuit must of been plugged up.  Thanks for the posts.
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#8 cylinder not firing at idle

Posted: 10/10/06 5:27pmMessage 28 of 30
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Adams' Apple
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That's kewl!!! Glad ya got it running right.

Joel Adams
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#8 cylinder not firing at idle

Posted: 10/10/06 5:29pmMessage 29 of 30
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kstyer
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Vette(s): 1975 C3 Red, T-Tops, Black Interior. All I need is time and money! Getting there!
Good news.   But if it was all carb, then at least 3 other cylinders, while perhaps firing, had to be weak.   It must be a big improvement.    Glad to hear it.
On the "Tail of the Dragon"
(some day, no strike that, October 2008 it turned red, still in progress!)

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#8 cylinder not firing at idle

Posted: 10/11/06 8:26amMessage 30 of 30
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Bill427
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Hagerstown, MD - USA
Joined: 8/12/2006
Posts: 17
Vette(s): 1968 427 vert, BB. Auto, PW, PS, and PB.
Thanks.
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