12-11-2017, 08:00 AM
Join Date: Aug 2015
Location: Glendale, AZ
Works fine with the stock filter box set up?
Your description of the issue sounds like you still had either a vacuum leak, or a source of air getting in behind the MAF, which made the ECU think the engine was getting less air than it really was, in turn causing a lean issue.
Alternatively, are you sure all sensors were installed AND plugged back in after the K&N install? I'm not familiar with the set up of your Jimny, as they were never offered in the US, but using my Vitara 2.0 for example, as I fitted it in my Samurai without the factory filter box, there was no place for the intake air temp sensor to go, and I had to re-route the fresh air intake for the PCV system. Though granted, neither of these would cause the issues you describe.
If by "idle body", you're referring to what we would call the "throttle body", the part where the throttle cable would attach, perhaps you either forgot to plug in the Throttle Position Sensor, or it's faulty on one or the other body?
1987 Samurai - SOA, 31s, 2.0L swap, ZOR bumpers/cradle, 6.5 t-case gears - rock crawler
1990 Ford F350 CCLB DRW 4x4 7.3L Banks turbo - tow pig
1959 International B-162 - future heavy hauler
1986 Chevy K5 - 489/4L80E/35s