Sr20det misfire/hesitation under 4k rpm - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

jduke · 11-03-2015, 05:02 PM

Above 4k rpm she rips hard no stuttering/misfire/hesitation, below 4k rpms it does all of that. Swapped a new o2 sensor(oem) and new spark plugs (bkr6e). looked over for boost leaks as well found none. I Just imported the car 90 180sx so im finding all the mods as i dig in. Where should i start next
Here's what i know it has so far.
Swapped to a red top SR
z32 maf
Trust FMIC
Power enterprise turbo
3" turbo back exhaust
Has a different ecu from "Technical shop ADVANCE original SPL ROM MT2000 real time rom emulator map tracer"

RoastedBumper · 11-06-2015, 11:18 PM

Try checking all of your coil packs with a multimeter.
I recently had an issue on a ka24de with those symptoms, drove fine for me above 3K but horrible misfire/bogging under that. Turns out my ignition coil resistance tested bad, despite plugs still sparking.

jduke · 12-26-2015, 11:42 PM

Got the issue resolved. It was either my maf or knock sensor/harness. Replaced my z32 maf with a known working one and also a put a new oem KS and wiring specialties harness.

jr_ss · 12-27-2015, 02:35 PM

Generally those are Maf related issues. Try cleaning the old one and swapping it back in.

11-03-2015, 05:02 PM	#1
jduke Zilvia Member Join Date: Jul 2006 Location: Aurora, CO Age: 35 Posts: 167 Trader Rating: (0) Feedback Score: 0 reviews	Sr20det misfire/hesitation under 4k rpm Above 4k rpm she rips hard no stuttering/misfire/hesitation, below 4k rpms it does all of that. Swapped a new o2 sensor(oem) and new spark plugs (bkr6e). looked over for boost leaks as well found none. I Just imported the car 90 180sx so im finding all the mods as i dig in. Where should i start next Here's what i know it has so far. Swapped to a red top SR z32 maf Trust FMIC Power enterprise turbo 3" turbo back exhaust Has a different ecu from "Technical shop ADVANCE original SPL ROM MT2000 real time rom emulator map tracer"

11-06-2015, 11:18 PM	#2
RoastedBumper Join Date: Sep 2013 Location: Oc California Age: 34 Posts: 25 Trader Rating: (0) Feedback Score: 0 reviews	Try checking all of your coil packs with a multimeter. I recently had an issue on a ka24de with those symptoms, drove fine for me above 3K but horrible misfire/bogging under that. Turns out my ignition coil resistance tested bad, despite plugs still sparking. __________________

12-27-2015, 02:35 PM	#4
jr_ss Post Whore! Join Date: Dec 2005 Location: Pa Posts: 6,415 Trader Rating: (35) Feedback Score: 35 reviews	Generally those are Maf related issues. Try cleaning the old one and swapping it back in. __________________ My SR20VET Does your VTC gear rattle in your S14/15 SR? PM me.

12-26-2015, 11:42 PM	#3
jduke Zilvia Member Join Date: Jul 2006 Location: Aurora, CO Age: 35 Posts: 167 Trader Rating: (0) Feedback Score: 0 reviews	Got the issue resolved. It was either my maf or knock sensor/harness. Replaced my z32 maf with a known working one and also a put a new oem KS and wiring specialties harness.