Before i begin i have searched through the forums and got bits and pieces of the info relating to my issue so i would like to put both things down together and give a better picture of what might be the problem. Useful input would be much appreciated.

I have a 08 X GSR 5MT Gulf Spec as i am based in Dubai. I got the car brand new and after about clocking 1200KMS on it i was pulling through 4th and 5th when the car started jerking between 6 & 7K RPMs as if it didn't want to go. So i let off and went home took the battery terminals out and reset the ecu. However after that i never got the chance to do the 4th 5th pulls. During all this the car was bone stock. No changes nothing what so ever.

A few days back i was standing at a traffic light and not more than 45secs. It was pretty hot outside about 38*C when suddenly i moved the car & the (!) light came up in the dash & felt like the car hit a wall ( i am guessing boost cut). However i took off and didn't push it again, slowly driving it back home.

Last night i got the chance to get out of the city and upon pushing the car through 4th and 5th i ended up getting the same jerking problem 6000 & 7000RPM range. I let of the gas and came to stop when i noticed that the RPMs would not settle below 2000RPM. However it was fine after switching it off/on. The CEL is showing up ever since i got the test pipe and will be installing the O2 sensor spacer soon.

List of mods on the car are
1)K&N Typhoon Intake with Upper IC Piping
2)Blitz SBC Spec R Boost Controller
3)Test Pipe
4)Invidia N1 Cat Back

The car is un-tunned for now and i am running 21PSI boost. Also i dont know if it has gotten any TSB revisions etc on it as i called Mitsu here and they have no clue about it. The relays are not the updated ones and it has the OEM plugs (mileage on the car now is 10500kms). I also have an LC1 installed and it reading 10.6 at WOT. I checked all the hoses and couplers for any leaks etc and everything seems fine.

What could it be? Plugs? Relays? Hitting the torque limit/air flow? MAF going bad? I mean after the mods i know it is effecting the stock parameters of the car but what about it when the car was dead stock?

And no i dont have a code reader or scan tool at my disposal.

Thanks and looking fwd to your input

 

not really "gulf spec" me guess yr romid 53040010 ?
no need 02 spacer cos you can disable it now via ecu
yeps u have code reader n it'll be great help if u can put the codes up here
the (!) is most likely caused by your ebcs, get rid of it and install a 3port
bet u got p1870/1 ? :P
might be a good idea to do your relays
oem spark plugs are fine
if maf is dead u will have idling probs
prolly AF/TQ limits
get a tune ! & stay outta boost for now
not sure but just my guess

 

got these two codes

1) P0420 Catalyst System Efficiency Below Threshold
2) P1235

 

Your main problem: https://www.evolutionm.net/forums/ev...p1238-etc.html

Disable the airflow / tq checks
Disable the engine overboost check
Disable the O2 checks