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12-21-2013
So I have a friend who has a 98 Regal with a top swapped L36 that has a misfire we can't seem to shake. It's an l36 bottom end, ported heads, Gen 3 S/C, 3.4 pulley, 180* Tstat, Fenderwell intake, Pacesetter headers, a custom full 3" exhaust, and we just put new coils, wires, and AL 104's in it gapped to .58 I believe it was.. It has a misfire at idle that we can't seem to figure out. Any ideas? The only thing I could think of is if the plugs are gapped too far apart..
12-21-2013
Stock gap is .060", so not likely.
No tune?
No beef.
Probably popped a piston from high compression + too small of a pulley.
12-21-2013
its not the gap.
check compression, icm, injectors, etc.
12-21-2013
He does have a tune on it. I just have no idea what else to check for this misfire. I believe he has stock L67 Injectors but they're nearly maxed out after the tune. I think his tuner is trying to fix KR by running the car pig rich but I'm not sure. I'm not an expert lol.
12-21-2013
Fuel washing cylinders.
Fantastic.
Running pig rich isn't good either.
12-21-2013
I think he's running too small of a pulley and needs a better tune personally. He sees about 3* of KR and is almost maxing his injectors out at WOT. Could the issue be the tune? Too much fuel at once?
12-21-2013
I'd think the pulley is too small,(not from personal experience just from what i read when i was going to topswap)
I would go back to a stock pulley size, a 3.4 pulley on a n/a bottom is like a 3.2 pulley on a gtp.
:4'' HAI\L67 HVTB\HV3\ER Rockers\WP underdrive pulley\Headers\cat delete\91 octane overkill incar tune.3.69 gears, Trans go shift kit.
12-21-2013
With ported heads and what not he should be fine at least with a 3.6. He needs to get a bigger pulley though and a better tune..
12-21-2013
I had a misfire on the top end (above 5500 rpm). Changed the icm problem solved. It's worth a try for your buddy's misfire.
12-22-2013
Hmm alright. Well we'll look into the icm and I'll try to talk him into a 3.6 or a 3.5 pulley and a better tune and hopefully get this solved.
12-22-2013
^^ Spam?
12-22-2013
I think so I have seen it on a few threads now...
:4'' HAI\L67 HVTB\HV3\ER Rockers\WP underdrive pulley\Headers\cat delete\91 octane overkill incar tune.3.69 gears, Trans go shift kit.
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