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Tom · 12-17-2002, 03:50 PM

g, I think increasing the spark plug gap and octane gas will raise the emissions. The larger spark plug gap might make it too hard for the spark to arck and not ignite the combustion process as well. Same thing for the higher octane gas: it will burn slower and problably not as complete resulting in more un-burned gas going into the exuast.

chevy68388- somthing isent right. I just went threw emissions with my 79. It only has the cats also. While my PPM were always low, the first time I had like 8. somthing CO. I turned down the timing, leaned out the idle mixture, and BAM! 0.0 CO and 150PPM. Thats like no emissions . Sure does stink when it comes out that way though

I think you just need to tune much better. Tune up, oil change, carb tuning, timing change.

12-17-2002, 03:50 PM	#15
Tom driving is in my blood Join Date: Dec 1999 Location: Mesa AZ Posts: 5,763	g, I think increasing the spark plug gap and octane gas will raise the emissions. The larger spark plug gap might make it too hard for the spark to arck and not ignite the combustion process as well. Same thing for the higher octane gas: it will burn slower and problably not as complete resulting in more un-burned gas going into the exuast. chevy68388- somthing isent right. I just went threw emissions with my 79. It only has the cats also. While my PPM were always low, the first time I had like 8. somthing CO. I turned down the timing, leaned out the idle mixture, and BAM! 0.0 CO and 150PPM. Thats like no emissions . Sure does stink when it comes out that way though I think you just need to tune much better. Tune up, oil change, carb tuning, timing change. __________________ -78 c10 short/step: 388cid, M20, 5/5 drop, lots more. Playtoy and first vehicle. -98 c1500 x-cab: 5.7L, 17" rims, 5/6 drop, flowmaster, helper bags,NBS rear disk brakes. -02 Suburban 4x4: leveled front -CBR600F4i, CBR600RR, CBR1000RR, and standup skis DISCLAIMER: I cant spell for the life of me.