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Thread: Truck missing at idle

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    Truck missing at idle

    Hey guys i know i haven't been posting in a while but today my truck (2003 harley) started to miss fire at idle seems like rpms dip down for a quick half second and you feel the truck shake as well and also at WOT it bogs down a lot. Recently replaced spark plugs and fuel filter if anyone could i would really appreciate it. Will post pics of my truck soon.

    MODS: Ported stock blower 15 psi,CAI, bassini exahaust,sct xcal tuner,6lb pulley

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    World's Fastest Street HD
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    what plugs and what gap?

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    I got the br something 7 iridium gapped at .037

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    also does anyone know about a good tuner around here austin tx

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    World's Fastest Street HD
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    NGK BR7EF's....usually the gap on those is 0.034, may help a little at WOT if you close the gaps up some, you may be getting some spark blow out. Shouldn't really be having those idle issues though. Can you pull any codes and see what its throwing, it could be a coil pack.

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    NGK TR6 stock number 4177 .35 gap

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    how would i be able to pull off a code without the engine light on?

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    World's Fastest Street HD
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    any handheld programmer can pull codes, or lookup the digital odometer trick in the how-to section. the truck can throw codes and not throw a CEL.

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    Yeah I'm pretty sure minds is doin the same thang. At idle it'll idle fine then I'll feel the motor kinda shake or stumble. I'm ordering new spark plugs to see if that fixes it. If not coil packs.

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    Are the tr6 a good replacement for a stock truck.

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    mine does it every once and a while. at idle the motor seams to shutter and then it is fine. i have never had any issues with it. it dips in rpms but only for a split sec.

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    exactly what mine is doing haven't had time to check the plugs but if anyone find the cure for this please let me know

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    Quote Originally Posted by SR81 View Post
    Are the tr6 a good replacement for a stock truck.
    A stock truck would run better with a TR-5, one heat range hotter.

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    mine does it too. i changed the plugs and it didnt help. i even gapped it a lil tighter .032 a second time but it didnt help. fuel filter is new as well.

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    So i took the spark plugs this weekend and gapped them at .034 and still have the same problem if not worse it now shakes a bunch when barley given throttle and then went to plug the scanner and no codes pull up. I starting to think its the fuel pump any other suggestion.

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