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Topic: #8 cylinder not firing at idle

in Forum: C3 Engines


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#8 cylinder not firing at idle

Posted: 8/30/06 1:06pm Message 11 of 30
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cj5nutz
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Ronda, NC - USA
Joined: 6/7/2006
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Vette(s): 77 & 71 & 85
[QUOTE=2 cruzn]

[QUOTE=Adams' Apple] 
but you changed the plug. 
[/QUOTE]

But did you check the gap on the new plug... not aways right out of the box either..

[/QUOTE]

 

Good call on that one.

 I just did a tune up on the 71 and not one of the eight plugs were gapped the same from the factory. One was at over 50 and two were almost completely closed. The rest were at or around 35 .

cj5nutz38959.5466898148




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#8 cylinder not firing at idle

Posted: 8/30/06 1:29pm Message 12 of 30
Ron 78
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Always Re-gap the plugs after you buy them,klutzy kids at the parts store ,drop them on the floor,check for cracked insulators too I'd go along with the bad cap,my $.02


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#8 cylinder not firing at idle

Posted: 8/30/06 5:15pm Message 13 of 30
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Adams' Apple
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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
[QUOTE=2 cruzn]

[QUOTE=Adams' Apple]  but you changed the plug.  [/QUOTE]


But did you check the gap on the new plug... not aways right out of the box either..

[/QUOTE]

But....but....I thought everyone knew that?!
Never trust a new plug to be gapped properly for any application. The only ones you don't have to worry about are the ones with the four electrodes...you know...the really fancy($$$$) ones!


Joel Adams
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#8 cylinder not firing at idle

Posted: 8/31/06 9:04am Message 14 of 30
Bill427
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Hagerstown, MD - USA
Joined: 8/12/2006
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Vette(s): 1968 427 vert, BB. Auto, PW, PS, and PB.
sorry, regapped the plug and also did a new plug and swapped from another location on the engine.  I will work on it this weekend.  Thanks.


#8 cylinder not firing at idle

Posted: 9/5/06 8:56am Message 15 of 30
Bill427
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Vette(s): 1968 427 vert, BB. Auto, PW, PS, and PB.
Changed out the cap and rotor.  Still not firing.  I did notice the temp of the car is down to 170 or so when running it.


#8 cylinder not firing at idle

Posted: 9/5/06 3:24pm Message 16 of 30
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Adams' Apple
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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
What ignition system do you have? Points? HEI? Aftermarket?
You have good compression on the cyl., so that shouldn't be a problem. Now, all you need is fuel, and fire! (At the right time, of course!)


Joel Adams
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#8 cylinder not firing at idle

Posted: 9/6/06 8:38am Message 17 of 30
Bill427
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Hagerstown, MD - USA
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Vette(s): 1968 427 vert, BB. Auto, PW, PS, and PB.
i have a tach drive distributor with electronic pick ups and msd 45k ignition coil, hi vibration.


#8 cylinder not firing at idle

Posted: 9/6/06 11:27am Message 18 of 30
Kiltime
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Piscataway, NJ - USA
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Vette(s): 1973 coupe silver Eng.383 stroker. Tremec 5spd 1977 L48 Stock
 I think I would revist the compression in that cyl.


#8 cylinder not firing at idle

Posted: 9/6/06 9:17pm Message 19 of 30
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Adams' Apple
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Have you checked to see if the plug is firing?
Take it out, or use a different plug. Plug the wire in, and hold the end of the plug against the engine(or other good ground...preferably NOT the carb!)), then have someone start it up. If you see a good spark across the electrode of the plug, then it is firing. That means the problem would have to be no fuel in that cyl., or a vac. leak really close to that cyl.
If there is no spark, then you have a bad wire, or something else is going on with the distributor.


Joel Adams
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#8 cylinder not firing at idle

Posted: 9/12/06 6:04am Message 20 of 30
Bill427
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Hagerstown, MD - USA
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Vette(s): 1968 427 vert, BB. Auto, PW, PS, and PB.
Update.  Checked the compression, still at 173.  Plug fires, wires are good.  Going into testing the vacuum.  


in Forum: C3 Engines


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