10-12-2014, 04:00 PM
Join Date: Oct 2011
Total Cats: 0
Could use help troubleshooting - Misfiring at 6200 RPM on a friend's 240sx
My friend has completed an SR20 swap in his '90 240sx.
He used a new wiring harness made by Wiring Specialties and an MSPNP2.
So far, he has replaced the Plugs, Coil Packs, Injectors, Fuel Pump, TPS, Knock Sensor, - basically every single sensor except for the CAS.
Attached is a datalog meant to capture the issue. Around 6000 RPM the car begins to misfire. It got a lot better when he replaced the TPS, but it still happens. The car still builds boost and RPMs, but it just misfires horribly.
Also, I've attached the tune file. It is the base tune that came with the ECU, with merely a couple of VE runs on it.
Stock 370cc Injectors
Red Top SR20DET
MSPNP2, MAF Delete
ISIS 255 Fuel Pump
93 Octane Pump Gasoline
Please let me know if you have any questions and thanks for the help in advance.
Last edited by dhyde9; 10-13-2014 at 11:09 AM.