IHEARTLS1

iTrader: (1)

6.0 l92 heads, victor jr intake, 750hp carb.


driving around town or on the highway steady state cruising every once in a while i get an intermittant misfire/dropped cylinder. it doesnt happen often, but i can feel/hear it every couple of minutes of cruising.


any questions ask, any ideas where to look let me know.

LS6427

iTrader: (2)

Dirty fuel filter. Does it clear up right away when you accelerate when it starts missing?

02 sensor could be acting up too. OBDII scanner is needed to see how they are switching while the engine is running at operating temp.

If your not getting any misfire codes its probably not a coil issue.

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IHEARTLS1

iTrader: (1)

its in a chevelle, no 02 sensor, no OBD, it is carbureted. it runs seemingly fine WOT.

IHEARTLS1

iTrader: (1)

and yes it clears up if i bring the rpms up

LS6427

iTrader: (2)

If it clears up right away...thats sometimes a symptom of a dirty fuel filter.

Make sure none of your spark plug wires are touching any of the exhaust manifold piping....or banging against them at all.

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IHEARTLS1

iTrader: (1)

one plug wire was contacting the header primary but i put it in a ceramic sleeve. it is not burned and the plug reads same as the others do. i have a mallory canister style filter near the tank and an inline filter near the carb. i will check it, but they are both virtually new.

the misfiring only happens between 1500-1900 rpm