!!!NEED HELP WITH STARTING PROBLEM!!!

[nismo13s]

hey guy, I need help with my rb20. I have a s13. I recently removed my rb20 witch was installed by someone else, to install new motor mounts and reseal the engine oil leaks(leaks were from valve cover). I reinstalled the motor witch was running great before i took it out, now the car wont start! I labeled all my wiring and reconnected everything. here is the breakdown of what is happening.

crank no startcheck all grounds, fuses and relays- fuses and relays are all good.check for fuel pressure good.removed coil packs and check for spark on all 6 cyl- i have good spark replaced spark plugs.checked ecu for codes, I got 55 all good.

I started to check all the wires again wiggle testing and then checking the ecu for codes. then i got a code 13 for a coolant temp sensor. I check that and got a new cts. tried to start still nothing. i pulled the connector and tried to start it and it almost started. I sprayed carb cleaner in the intake and it started but then ran like sh*t. i then check timing and all the marks were way off to the left. I then plugged the coolant temp sensor back in and it then stalled. I also cleaned the acc valve, which was dirty and that help a little with it trying to turn over but still no start without carb cleaner. I tried to time it when it was running by ajusting the cas and acc valve to set the idle but whatever i did it was still off. im lost now. the car will start sometimes without carb cleaner but after it has ran for a little bit and it will only start if i have the coolant temp sensor unplugged. when it is running and i plug the coolant temp sensor back in, it stalls. i tried everything i know and everything on every forum. I think there is a problem with the wiring for the coolant temp sensor but when i check for codes and the sensor is pluged in, i get a code 55 all good. I dont know what else to do. !!!PLEASE HELP ME!!! . I think thats everything. i have been on this for 1 month now for my project and im starting to pull my hair out. I need to know what other steps to take. Thanks

[nissanman04]

hmmm...do you know if your cold start wire is hooked up? i know mine had a hard time starting when that wasn't connected. IIRC, it's the "ignition start signal" wire from the ecu spliced into the orange wire on the dash plug. If you need more info on this just do a quick search, you'll find the information.

good luck w/ it, mine took a week of troubleshooting before it started, hang in there.

[nismo13s]

Yea my orange wire is hooked up to a black and yellow wire coming from a connector in the main wiring harness by the ecu. it is not hooked up directly to pin #43 coming out of the ecu, but i think it might run there i just underneth all the wraping. I'll try to take some pics today. the thing with my wiring is that the wiring pinout from the rb20 ecu does not match the pinout that i have coming out of my ecu. for example i have power going to the #33 and 35 pins but in the pinout diagram those are not used. i dont know how he wired it eather. Im wondering it he used the ka harness and wired it with the rb. My car used to be auto so i have a bunch of connectors under the dash and i dont have a clue what to do with. he uses one wire from a connecter and and wire it to the harness and then another wire from a totally different connector and wires it to the harnees.aaahhh this thing is a mess . I will take some pic and post them later today.
Modified by nismo13s at 2:38 PM 5/1/2006

[nismo13s]

i dont know how to put pic on the post this sucks. does anyone know what im talking about or had any thing like this before? does anyone have a ecu pinout for 90 auto 240? I need some help here.

[nismo13s]

I can only start my car with carb cleaner, when i go to start it without the carb cleaner it just cranks, when i spray the cleaner in it will fire right up and run for awhile as long as i have the timing waaay advanced. as soon i i try to set the timing to 15btdc it will start to stall. i dont know where to go and what to go after first. i have to problems. 1 it will not start with out carb cleaner and 2 the timing is way off and i dont know how to set it without it stalling. I really need some help here guy

[USMCgetsome]

ok lil whoodie! Slow down and lets start with the basics. This sounds like 2 things. Reset the ecu by unplugging the battery for at least 1 - 5 mins let the system drain. Try to crank afterwards. Post up what the results are. Next is the fuel injector system. You'll need a noid light to see if the ecu is sending the injectors a pulse signal. Check your fuel pump lines to see if they are swapped. Feed on bottom return on top. after that if still no workie. Go back over the engine harness. Unplug all the damn connectors that go to sensor and replug each one back in. mainly water temp, air temp, oxygen sensor, knock sensors, cas, maf. You get the idea. I believe you have either a sensor prob or a fuel prob. The ecu wont kick the motor over if you do not have everything plugged in.

let me know. If you need quicker answers email me at [email protected]. I'll help out as much as possible. Lets get it turned over.

[nismo13s]

Thanks, I will do that in a little bit and post the results.

[nismo13s]

> ok, well i totally overestimated my electrical ability. I am lost on how to measure for continuity for each injector, injector pulse and power supply to the ecu. I think i need to be babied through this step by step by step. let me tell you what i do know to see if this helps.fuel lines are in the correct order. i have 45psi of fuel. I have power to both sides of the fuel injector harness for each injector 12.73v. i tried to measure continuity and i got reading from 0.8 to 13.9ohms so i stoped right there and went inside. i do here the injectors plusing.(put a long screw driver to each injector and listened when cranking). I dont know if this is relivant or not but the ecu does turn on the led flashes a 55 when i test for codes. i also noticed that when the car was running my turbotimer was not on and my a/f gauge was not on either both are wire to the "on" side of the ignition switch. that is where the guy wired them but they never worked. again i dont know if this helps but i need to put as much info out there. if anyone can give me a step by step guide to figuring this out i would really appreiciate it. and if there is anyone around the wisconsin/Illinois area and the have some time, i will pay for you to help me out on this one(gas too ;D)

[USMCgetsome]

check your grounds to the fuel injectors. Black wires. Anyhow, sounds like you have all the right things. Step by step is to check for both plugs to the fuel injectors. You have the 2 wire plug which is the 12vdc and there is a 7 pin plug which is the ecu pulse signals. besides that center the cas and try again. Is the fuel pump pumping?

[nismo13s]

check your grounds to the fuel injectors. Black wires.

Where are these ground wires located? on the ecu? and yes my fuel pump is working.

[USMCgetsome]

grounds are forward of the water pump inlet from the radiator.