RB20 Electrical Problem

Discuss the RB20, RB25 and RB26 series engines.
Cloud7659
Posts: 11
Joined: Tue Aug 09, 2005 5:51 pm
Car: 1991' RB240

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hey guys, well my rb20 is in and ready! Or so I thought, the bastard won't start. Heres the thing, I have power to my ecu, power to my fuel pump (which drops to about 8.8 to 9v when the car is cranking) I do have spark BUT I just checked my injectors for voltage and got a 12v on both injector plug wires (cylinder 1) even when my key is out. This can't be right huh? Any feedback would be greatly appreciated. Oh, and I run an ecu Diagnostic and it gives me a 55, which means that SHOULD be ok.


Andrew85cm
Posts: 181
Joined: Fri Nov 28, 2003 11:59 am
Car: 89 240sx with RB20det

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Check to make sure your battery voltage is up and good and charged. Your ecu has to have a certain amount to run and let the car turn over. Double check all your wiring to see if there is an issue. I know this sounds simple but make sure you check and recheck everything even though it may be frustrating. Also try having someone else check over your work sometimes you may randomly miss something.~ANDREW~

Cloud7659
Posts: 11
Joined: Tue Aug 09, 2005 5:51 pm
Car: 1991' RB240

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Ok, I sprayed starting fluid into the throttle body and it started right up. But then it dies. That means it has to be injectors right? How can I check to see problems with my injectors. I have fuel because my fuel pump is pumping lots of it, but My injectors have 12v and never get any ground.

User avatar
lyon23
Posts: 379
Joined: Wed Apr 14, 2004 4:16 pm
Car: 95 240sx
Location: Florida

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Could be your CAS. Or timing could be off.

Cloud7659
Posts: 11
Joined: Tue Aug 09, 2005 5:51 pm
Car: 1991' RB240

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I don't think its timing because my injectors don't get any ground at all. How can I check to see if I have a bad cas?

Cloud7659
Posts: 11
Joined: Tue Aug 09, 2005 5:51 pm
Car: 1991' RB240

Post

BUMP. Ok I need some help, my injectors are not firing, I have fuel in the rails but I have no fire signal in the injectors. The ecu is not sending them ground. How can I fix this or check what is wrong?

Also, nearing the firewall, coming out of the efi harness there is a little plug with two blue wires that have ground on them (when I test it). They are cut, I don't know if this has anything to do with anything, im just throwing it out there.


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