t_ahan
Full Access Member
03 Denali LQ4 block: recently built now 6k mileage. studded, forged and bored bottom end...studded/slightly worked 243 heads, mild cam, comp valve terrain, msd coils w/relay harness, o.e. acdelco plug#/wires, FAST LSXRT w/FAST rails,aeromotive regulator, and i know i need better injectors but right now them and the pump are STOCK!!! oh yeh in person BB tune: my tune b4 bb tune: afr 14.6.1 ran great but Justin didnt like that i had her turn't up that much for a DD, so for the longevity of the motor bbtune afr 14.1.1
im not sure if the misfire is fuel related or ignition related or nothing to be overly concerned about.....now to the situation
normal driving a/c on 1k-1.8krpm range, high gear, high engine load, i feel a slight misfire. I stuck the modis in to view miss count(no codes) and all other pids but i have 0's for all cylinders in the counter and all pids are what i am used to seeing.
When Justin tuned her up a month or so ago, outside the normal tables he had to bump the air up (crappy quality control bbk tb) but he also made the misfire counter and knock sensors less sensitive, then set me up for the long tubes by killing cat and rear o2 codes, so is it possible thats y the modis isnt seeing anything in the misfire counter?? anyways ..
Of course i assumed the worst as always and thought i hurt the motor again so decided since im pullin plugs for inspection to check compression(all cyl 195-200 what a relief!!!) stuck the bore-scope in each cyl(all are fine no tell tale signs or anything)
only thing i could find was all 8 plugs were red on the electrode tip insulation(white porcelain) i have never seen or done this to a set of plugs before so im not sure what this indicates other than maybe heat???
So is it the lack of fuel or do i need to run colder plugs(o.e. acdelco plugs in it now)??? or should i stop running it till i figure it out? it runs great outside that rpm range
Any Advice/ Guidance would be greatly appreciated, i really dont want hurt this motor so soon!!! let me know if more specifics would help u all help me, thanks everyone
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im not sure if the misfire is fuel related or ignition related or nothing to be overly concerned about.....now to the situation
normal driving a/c on 1k-1.8krpm range, high gear, high engine load, i feel a slight misfire. I stuck the modis in to view miss count(no codes) and all other pids but i have 0's for all cylinders in the counter and all pids are what i am used to seeing.
When Justin tuned her up a month or so ago, outside the normal tables he had to bump the air up (crappy quality control bbk tb) but he also made the misfire counter and knock sensors less sensitive, then set me up for the long tubes by killing cat and rear o2 codes, so is it possible thats y the modis isnt seeing anything in the misfire counter?? anyways ..
Of course i assumed the worst as always and thought i hurt the motor again so decided since im pullin plugs for inspection to check compression(all cyl 195-200 what a relief!!!) stuck the bore-scope in each cyl(all are fine no tell tale signs or anything)
only thing i could find was all 8 plugs were red on the electrode tip insulation(white porcelain) i have never seen or done this to a set of plugs before so im not sure what this indicates other than maybe heat???
So is it the lack of fuel or do i need to run colder plugs(o.e. acdelco plugs in it now)??? or should i stop running it till i figure it out? it runs great outside that rpm range
Any Advice/ Guidance would be greatly appreciated, i really dont want hurt this motor so soon!!! let me know if more specifics would help u all help me, thanks everyone
