91s13nick
10-28-2011, 11:57 PM
okay so i have a stock gtir motor with gtir harness ecu and maf. in a ser b13. well now it seems right around 4500 to 5000 rpms it wants to break up and pop. it almost feels like a rev limiter. i gapped plugs and changed fuel filter cleaned up the rotor alittle. just dont know what else to do now. i have it set at low boost its at 7 pounds. it does it every gear. one time i drove it it seemed it went threw boost fine but it was one gear that one time. what could it be?
punkcav
10-29-2011, 12:20 AM
can you do a fault code test? most likely it is fault 34 knock sensor
91s13nick
10-29-2011, 01:13 AM
ill have to try that. i have to do a thread search to find out how to
91s13nick
10-30-2011, 05:21 PM
knock sensor is fine its not that. i tried jumpin the plug to get the codes and it dosent do a thing tried and tried and tried again dont know
dxpxe
10-31-2011, 01:27 PM
does it happen hot...cold.... will it free rev or does it do it with a load on the engine aswel. give more infor on the car and the situation
91s13nick
10-31-2011, 02:36 PM
okay so its 91 ser with gtir. gtir ecu,maf,and harness. seems like today i turned the boost down to about 8lbs. seems when it was cold it boosted fine and took off. then it g ot a little warmer snd right around 45 to 5000 rpms broke up. seems to have a high idle. around 2000rpms. some times it goes down to around 1500rpms checked for boost leaks and havent found a thing. no free rev or anything. only breaks up under a load. you can throttle it up not moving and it will be fine.
FontanaNissan
10-31-2011, 06:00 PM
Its probably your ecu. I had the exact same issue with my swap. I got it tuned by Clark Steppler at Wolf Technology...he fixed it right away! Apparently its some sort of fail safe thing in the ecu that Wolf Tech has an easy fix for ;)
91s13nick
10-31-2011, 09:26 PM
i would just hate to send it there and wait if it dosent fix it lol mabey ill try a good working ecu and if thats it then ill send it out
RalliartRsX
10-31-2011, 10:22 PM
How did you check for boost leaks??
91s13nick
11-01-2011, 07:19 PM
im sorry i meant to say i checked for checked for vacuum leaks, but i should test for boost leaks to.
RalliartRsX
11-01-2011, 08:45 PM
Yes this sounds like a boost leak issue actually.
driftapimp
11-01-2011, 09:24 PM
hows ur fuel pressure?
does pump have sufficient voltage?
did u install a walboro?
91s13nick
11-02-2011, 05:56 PM
thats 2 things i havent checked volts to the fp and fuel pressure. and yeah i have a walbro 255 in it