first time RB25 startup, not getting fire HELP!!

[chad b.]

After many delays, and problems troubleshooting my Chasebays harness, we finally got the correct TPS and MAP voltage, and tried to start my car. It's is an RB25 with AEM EMS series2. The CAS I am using is a Mitsubishi unit from a z32 with the AEM trigger disk. My motor came with the Hitachi unit. The trigger disk cannot be changed in these, so I got a Mitsubishi unit from a z32, which looks to be the same as the RB25 series 1 CAS. Anyway, it turns over, and we're getting fuel, but no fire and no RPM signal while turning over. The EMS has selections for SR/RB CAS, stock RB CAS, stock RB CAS w/ AEM trigger disk, and Z32 CAS. I'm not sure if the CAS is just bad, or if we have this thing calibrated to the wrong setting. Everything else seems to be in check. We tried all the different setting for CAS selection, and nothing. Anyone know what to do?

[Ramius83]

What's the current specs on the engine? Can you throw in a stock ecu and the stock cas and see if it starts? With the ignition on and the cas unbolted from the timing cover but plugged in and turning the cas, do the spark plugs fire? Do you have 12v voltage to the coil packs with the ignition on?

[robbie2883]

i'm pretty sure with the aem that spinning the cas by hand will not fire the coils, injectors...BUT you should get a reading on the laptop. you didn't break the tab in the cam shaft that turns the cas by any chance did you?

make sure the cas is getting power and ground properly as well

[95_240]

The cas wires on my Chasebays harness were backwards on the signal wires. I'm so glad I sent that piece of s*** harness back and got one that actually works from Wiring Specialties.

[gawdzilla]

i'm pretty sure with the aem that spinning the cas by hand will not fire the coils, injectors...

why not?

[elguapo260sx]

The cas wires on my Chasebays harness were backwards on the signal wires. I'm so glad I sent that piece of s*** harness back and got one that actually works from Wiring Specialties.

ive dealt with chase bays and they are a bunch of idiots. waited weeks on parts and was given wrong parts multiple times. i almost bought a harness from them for my rb. i just spent about a days worth of time and a case of beer and made my own. saved 700 dollars. they do not know how to install an AN fitting. had to redo several on the PS kit i got from them. there stuff looks nice, ill give them that.

[chad b.]

Yes, Chase Bays is garbage, I agree. So, I called Ricky at Raw Brokerage, and he told me the CAS was the problem, so I bought a new RB CAS from them and installed it on the motor. We were getting 10k rpm on turn over, so something was major wrong. I then took the AEM trigger disk out of the z32 CAS that I had and installed in into the RB CAS and reinstalled in on the motor. Now We're getting 250rpm on turnover, and spark, but no start. The plugs are getting fuel on them, so the injectors must be firing. We checked all of the injectors and coils from engine to the ECU plug to make sure everything was in the right place, and it is. I also did a compression test to make sure the valves were closing. The compression was dead on across all 6 cylinders. So, now I'm starting to think the CAS wires must be wrong. In the AEM paperwork, it says that the 2 shielded wires on the CAS go to CAS signal and CAS sensor. One reads like 0-120 degrees and the other reads like 121-180 or something like that, I don't remember exactly, and they go in pins 41 and 42 on the AEM and jumper to 51 and 52 which are the power and ground wires (unshielded) on the CAS. I was told that if the AEM doesn't see at least 500rpm at cranking, it will not start the startup sequence. The motor is turning over very fast, so I'm starting to wonder if the two wires (pins 41 and 42) are crossed up, causing it to read the trigger disk incorrectly.

Does anyone have the wiring colors for RB CAS, Z32 CAS, and Neo Hitachi CAS?

I may have the same problem 95_240 was having.

[Carl H]

unless the harness was disassembled completely, the cas wires should not be switched...
there is a 360* signal and a check signal in 30* increments (i think).
obviously when using the aem disc this changes but still the signal output should be the same.

verify that you have spark, if you dont have spark then there is a problem else where...the fact you are getting injection means that the ems is seeing motor rotation.

[chad b.]

It has spark and fuel. As for the harness, it's a completely new harness with all new wiring and plugs made from scratch.

[chad b.]

We figured out the problem and the car is running. The wiring inside the harness was wrong for TPS and MAP. It made it's maiden voyage last night. Booyah!