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View Full Version : SR-Possible misfire-high rpm-how to diagnose with consult program


JTunedMotorsports
05-11-2008, 11:29 AM
hello all
I am having a bad misfire every so often at high rpms...motor is freshly gasketed..etc..timing, plugs gap....i have the consult programs and would like to know who hows how to datalog and diagnose the prob..I think it is a coilpack..Also whats the best way to check the coilpacks in terms of ohms or volts..and which prongs to work with.i already cleaned and inspected them.PPl who have experience give feedback ONLY.

JIm

cotbu
05-11-2008, 12:21 PM
Which program are you using, Anyway look at timing, knock, injector duty, 02 voltage, mafs and check codes for cyl1-4 or random misfire. if your using ecutalk, the gauge needles for these would drop.(i dont know how to play the logs back so i used a video camera) calumsult, the graph would peak then drop down and up sporadically .( set the start rpm, the do a pull) Srtalk was the program i used to find stock mafs problem, moving to much air @ 13psi on stock turbo
(get your fuel map, monitor and trace) also make sure your not in low octane fuel map.

It's probably going to be apparent that there is a misfire, but finding it make take some skill if theres no codes.

JTunedMotorsports
05-11-2008, 05:35 PM
Which program are you using, Anyway look at timing, knock, injector duty, 02 voltage, mafs and check codes for cyl1-4 or random misfire. if your using ecutalk, the gauge needles for these would drop.(i dont know how to play the logs back so i used a video camera) calumsult, the graph would peak then drop down and up sporadically .( set the start rpm, the do a pull) Srtalk was the program i used to find stock mafs problem, moving to much air @ 13psi on stock turbo
(get your fuel map, monitor and trace) also make sure your not in low octane fuel map.

It's probably going to be apparent that there is a misfire, but finding it make take some skill if theres no codes.
I am using nissan data scan 1.52..is that any help.?

cotbu
05-11-2008, 06:18 PM
No,............ sorry!

Blown240sx
05-11-2008, 06:37 PM
Its High RPM cut out only?

What kind of boost and Turbo? Gap? Plug type?

JTunedMotorsports
05-11-2008, 07:08 PM
Its a high RPM...Sometimes i get it and sometimes I dont...I need a ways to check the coilpacks.
stock s13 sr20det black top...stock ic...3 inch, hks mushroom filter..plugs NGK bkr6e--gap .028..motor was prepped with gaskets and cleaned.