Injectors not opening...help

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fanmanflex
Posts: 35
Joined: Sun Oct 08, 2006 5:48 pm
Car: 1993 Nissan 240SX

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Need help diagnosing injector problem. Had this prob last winter on my dohc so the car sat for a while. Fuel pump is working and getting fuel to the rail but the injectors aren't opening. took out the rail with everything hooked up, fuel is going into feed and out return but when i crank it the injectors are not spraying.

Recently rebuilt the motor to stock over the summer and obviously still having the issue.

Tried all the grounds made sure they're hooked up well, and they're getting the constant 12v just ground is not switching. Thinking it could be maybe the fpr open to much and not letting injectors open? or crank/cam angle sensor? idk.

Can i check the sensor with a multimeter anyone know. any help would be great.
Modified by fanmanflex at 7:07 PM 10/3/2009


fanmanflex
Posts: 35
Joined: Sun Oct 08, 2006 5:48 pm
Car: 1993 Nissan 240SX

Post

ok so checked signal with a noid tester light and no signal like i expected. ordered a new ignition control module that will be here monday.

anybody have any other ideas what could be going on? really anxious to drive this thing with a fresh rebuild

vancouverbc
Posts: 3197
Joined: Thu Oct 30, 2003 1:30 am
Car: 1991 240sx

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fanmanflex wrote:ok so checked signal with a noid tester light and no signal like i expected. ordered a new ignition control module that will be here monday.

anybody have any other ideas what could be going on? really anxious to drive this thing with a fresh rebuild
how about the integrity of the signal wire from computer to injectors ie ground or the injector relay. not sure if injector relay would cause this symptom though. you can switch the injector and fuel pump relay to see if symptoms change.

fanmanflex
Posts: 35
Joined: Sun Oct 08, 2006 5:48 pm
Car: 1993 Nissan 240SX

Post

yeah i switched them today and it didn't do anything. found a bad eng cont fuse and replaced that but didn't do anything. i sometimes get a small spray right after cranking.


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