Misfire on #2 and #6 - Lexus IS Forum
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post #1 of 9 (permalink) Old 03-17-2016, 01:11 PM Thread Starter
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Misfire on #2 and #6

I've been plagued with misfire codes ever since i bought the car. It drives well, but the lumpish idle and lean spikes/hesitation when crusing are kind of annoying.

I got the car retuned recently with new spark plugs a few weeks ago, but the issue is still here. (Maybe they were fouled during the tune.. ?)

I get random cylinder misfire codes as well as #2 and #6 misfire codes.

I'm going to replace the plugs again next oil change, but other than that what else should I look at?

02 GGP E-Shift // PTE5858 - 7psi - 350whp
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post #2 of 9 (permalink) Old 03-17-2016, 01:39 PM
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ignition coil packs should be something to look at, maybe try switching them out.

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post #3 of 9 (permalink) Old 03-17-2016, 01:55 PM Thread Starter
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I was thikning packs, but I wonder why only #2 misfies, but not #5 and why #6 misfires, but not #1 since those cylinders are linked.

02 GGP E-Shift // PTE5858 - 7psi - 350whp
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post #4 of 9 (permalink) Old 03-17-2016, 02:06 PM
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Have you replaced the spark wires? I would OHM out the coils if so. The specs are floating around here somewhere... I posted them a few times with pics from the manual

What are you gapping the plugs to?

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post #5 of 9 (permalink) Old 03-18-2016, 08:38 AM Thread Starter
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Have you replaced the spark wires? I would OHM out the coils if so. The specs are floating around here somewhere... I posted them a few times with pics from the manual

What are you gapping the plugs to?
Stock plug wires. I'll prob order a set of NGK plug wires the same time I do my plugs since they are cheap.

I'll look around and get familiar with ohm'n out the coilpacks too.

I am using NGK6282 Copper Plugs gapped to .30.
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post #6 of 9 (permalink) Old 03-18-2016, 12:23 PM
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2 years ago I had misfire issues with only #1 & #6 . I changed to NGK plug wire and still misfired. It turns out I had tiny vacuum leak causing the misfires.
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post #7 of 9 (permalink) Old 03-18-2016, 12:30 PM Thread Starter
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I sprayed half a can of break cleaner on all the hoses i could see and it didnt hear a change in idle. What method did you use to identify the leak?

02 GGP E-Shift // PTE5858 - 7psi - 350whp
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post #8 of 9 (permalink) Old 04-11-2016, 12:32 PM Thread Starter
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Just an update. I got my car back a few months ago from a shop that replaced my turbo. They changed the spark plugs after a compression test so I figured they were all good.... They were gapped anywhere from .22 to .30. Ridiculous.

I got some new NGK wires (old ones had some wear on the rubber head), 6 new spark plug and gapped by my self with a feeler gauge @ .28, tested the resistance of all 3 coil packs (came out at .7ohms across the board), swaped the position of all 3 just to be sure.

Runs smooooooth now. Finally.

I guess if you want it done right you gota do it yourself!
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02 GGP E-Shift // PTE5858 - 7psi - 350whp
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post #9 of 9 (permalink) Old 04-21-2016, 11:52 AM Thread Starter
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ITS BACKKK!

My idle slowly got more and more lumpy. Two days ago I replaced my MAF sensor with a new OEM one. Today I got a cel form misfires from cyl 2 and 6 again.

What do i look at next? Injectors? Increasing/decreasing my gap? Fuel pump? I am annoyed to say the least.

EDIT: I just remembered i dropped my idle timing last night from 17.5 to 13.5. What have you NA-T guys have your idle timing set at?

02 GGP E-Shift // PTE5858 - 7psi - 350whp

Last edited by trd_inside; 04-21-2016 at 12:41 PM.
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