rb20 problems

[rb20fb]

I am having problems. i installed an rb20det into my 90 240. when it started it studderd. i then added a 255lph fuel pump, ran smooth then i changed plugs now cylinder 4&5 injectors are not firing. i heard other people have had this problem does any one know how to fix it. P.s. i also changed out all the injectors and coil packs and i am still having the problem

[rb20fb]

I also changed the ignitor and tested spark it is getting spark but seems like little fuel. thinking it might be wiring problem also swapped out 4 thru six cylinder injector harness. i have no clue and i am getting frustrated please help

[Andrew85cm]

I was missing in my first and second cylinders. I swapped out my spark plugs and I began firing in 5 instead of 4. I then proceeded to swap out 2 of the coil packs and the ignitor chip and that did nothing. I figured out it was an injector clogged so a guy at P1 tapped on it for a little bit with a screw driver and it ran like a dream. It seems like you tried all the things I did. Other than that I can't help sorry. Maybe check to see if they are gapped right.~ANDREW~

[Slo_240sx]

check compression. If thats not it then check for a vaccumm leak right at the injector.

[USMCgetsome]

i'm having the same issue. My first 2 cylinders aren't firing.

Things i've checkedIgniter Chip - goodecu signal to ic - goodwiring to injector and coil packs. same

I physically removed my fuel rail and left the plugs in and watched them spray. Then i watched my coil packs fire with the plug installed to chasis ground.

I then thought it was a vaccum problem at the fuel rail and i pulled the plugs again and there is still no combustion.

need more info email me at [email protected] or usmcgetsome on yahoo messenger.

[rb20fb]

I Checked compression and it was between 120 to 130 allthe way across. i also checked for clog and i replaced the fuel rail including injectors it still is mis firing. i also need to know how to run the lower harness. the ka transmission had four sensors on it and the rb20det has 2 sensors. what do i need to hook up. plus my cts isnt working on my dash, how do i hook that up to the harness. its not a stock ecu it is tuned by tomei so do i need to hook any more stuff up. plus should i hook up the white plugs under the dash, i tried but they wouldn't reach eachother. thanks for all the info.