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low octane=misfire?

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Old Dec 18, 2011 | 11:41 PM
  #1  
NathanLewis's Avatar
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From: Virginia
Car: 85 camaro z28
Engine: 355
Transmission: t-5
Axle/Gears: 3.73
low octane=misfire?

Is it possible that using a low octane on an old 305 can cause a misfire? Maybe if i used 93 octane, it would stop?

I changed all the plugs, wires, and it still misses on the 8th cylinder sometimes.

I don't think its a bent valve.
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Old Dec 19, 2011 | 07:32 AM
  #2  
305sbc's Avatar
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From: Fairview Heights Illinois
Car: 1986 Irocz
Engine: 305 TPI
Transmission: 700R4
Axle/Gears: 3.25:1
Re: low octane=misfire?

Originally Posted by NathanLewis
Is it possible that using a low octane on an old 305 can cause a misfire? Maybe if i used 93 octane, it would stop?
No, no chance at all.
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Old Dec 19, 2011 | 07:38 AM
  #3  
torque_is_good's Avatar
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Re: low octane=misfire?

nope

if you don't have a roller engine then it could be a worn cam lobe

it doesn't hurt to try the cheap stuff first, cap and rotor
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Old Dec 19, 2011 | 12:52 PM
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From: Arlington, Tx
Car: 91 Camaro RS
Engine: empty bay (for now)
Transmission: Built T-56
Axle/Gears: 3.42 stock posi disc
Re: low octane=misfire?

low octane = possbile detonation, not a missfire. it could be a bad wire, plug, or a bad spot on the cap.
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Old Dec 19, 2011 | 05:46 PM
  #5  
NathanLewis's Avatar
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From: Virginia
Car: 85 camaro z28
Engine: 355
Transmission: t-5
Axle/Gears: 3.73
Re: low octane=misfire?

Originally Posted by travis401
low octane = possbile detonation, not a missfire. it could be a bad wire, plug, or a bad spot on the cap.
but i already replaced the cap, plugs, wires...


Its the number 8 cylinder. It misses.


I don't want to waste my money on a 305 either, so if its a camshaft, i'm gonna have to junk it.
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