Jump to content
SAU Community

Rb20det Doesnt Have Injector Pulse On 1,3,5 What Do I Do?

falky929

By falky929,
in Engines & Forced Induction

 Share

Recommended Posts

falky929 Rising Star

falky929

Posted
Posted

i have a rb20det it doenst have injector pulse on cyclinders 1,3,5. i have changed the ecu over with another ecu that works made no differance at all i have allso test all the injector wires back to the ecu pins and they are fine. what can it be?????? i did notice that the injectors have power running to them all the time even when the cars switched off is that ment to happen?

The Dan Grand Master

The Dan

Posted
Posted
i have a rb20det it doenst have injector pulse on cyclinders 1,3,5. i have changed the ecu over with another ecu that works made no differance at all i have allso test all the injector wires back to the ecu pins and they are fine. what can it be?????? i did notice that the injectors have power running to them all the time even when the cars switched off is that ment to happen?

The injectors should only have power while the ignition is on.

If they have power all the time then either the injectors have burnt out internally or there is a problem with your main loom powers/earths.

Check the main power wires, they run around the base of the strut tower on the turbo side and up to a large rectangle plug beside the power steering res. Make sure nothing is melted/grounded/joined to another wire.

If you have a 12v power connected to the trigger wire, you'll still get continuity back to the ECU but you'll get constant power at that wire which means the injector will not pulse

talky Proficient

talky

Posted
Posted

try tap the injectors with a screwdriver or something mine did this all fixed now .......has the car been sitting for a while?also as mentioned previously make sure you loom is in good working order i had abodgey loom keept pumping fuel hydrulic my motor !!!

falky929 Rising Star

falky929

Posted
  • Author
Posted
The injectors should only have power while the ignition is on.

If they have power all the time then either the injectors have burnt out internally or there is a problem with your main loom powers/earths.

Check the main power wires, they run around the base of the strut tower on the turbo side and up to a large rectangle plug beside the power steering res. Make sure nothing is melted/grounded/joined to another wire.

If you have a 12v power connected to the trigger wire, you'll still get continuity back to the ECU but you'll get constant power at that wire which means the injector will not pulse

yeah ive checked them seems to be fine but must be brocken some where. so what ur saying is if there gettin power all the time it wont be able to pulse there for the injectors wont work. all so its geting power to ALL injectors all the time but only cylinders 1,3,5 dont have a pulse?

falky929 Rising Star

falky929

Posted
  • Author
Posted
yeah ive checked them seems to be fine but must be brocken some where. so what ur saying is if there gettin power all the time it wont be able to pulse there for the injectors wont work. all so its geting power to ALL injectors all the time but only cylinders 1,3,5 dont have a pulse?

allso car starts but only runs on 3cyclinders if that helps

falky929 Rising Star

falky929

Posted
  • Author
Posted
The injectors should only have power while the ignition is on.

If they have power all the time then either the injectors have burnt out internally or there is a problem with your main loom powers/earths.

Check the main power wires, they run around the base of the strut tower on the turbo side and up to a large rectangle plug beside the power steering res. Make sure nothing is melted/grounded/joined to another wire.

If you have a 12v power connected to the trigger wire, you'll still get continuity back to the ECU but you'll get constant power at that wire which means the injector will not pulse

the only way to stop the power goin to the injectors when the car is switched off is when u take the 25amp engine controll fuse out thats in the bonnit or take the ecu out

  • 5 years later...
Scott Black Rising Star

Scott Black

Posted
Posted

Well have you checked if you have 12v with ignition on to one side of each injector? If not then you have a break in the harness on the power side of the injector harness. If you do then you need to trace each pin on the other side of each injector back to the ecu. And if you do and that all checks out then it just leaves a dead injector driver on the ecu board then.

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
 Share
Go to topic listing


  • Similar Content

  • Latest Posts

    • silviaz
      Returning after a long time!

      By silviaz · Posted

      That's awesome. Fully serviced/full log book history for one of those cars is super rare from what I know. With JDM's like Skyline's, Supras, are quite hard to find one with full log book history. S15's seem to be somewhat of an exception, at least the spec s australian delivered models.
    • DRoc81
      R33 GTS25 NA - Stalling when vehicle is at operating temp

      By DRoc81 · Posted

      Hey all, It's been a bit since I have been able to update.  I pulled the fuel pump, first off it was a "universal" pump and the strainer was very clogged, and it was folded over on itself.  I replaced the fuel pump and all is well....  No more stalling.
    • Roy
      Garrett G Series

      By Roy · Posted

      That's convinced me I'll bump up the G30-660 to 770   Any idea if the difference in boost pressure? Cheers
    • Keeper
      SAUNSW - GTR Festival 2025 - Saturday 24th May

      By Keeper · Posted

      When: Saturday 24th of May 2025 - All day Where: Sydney Dragway, Eastern Creek Cost: Varies - Book direct with the GTR Festival Website We will be there on the day with a stand please reach out via our interest form if you wish to help out with the stand. Limited parking will be available in the display area, first in first served with current members getting priority, please register your interest with the link above also. Please post any great photos you take on the day on this thread and we will try use some in our e-mails/website/social media
    • silviaz
      Steps to DIY sanding car back ready for respray....

      By silviaz · Posted

      Hey guys so turns out this project is going to be much bigger than I thought haha but I've done some my homework and have done a few panels on my car, but one part I can just not visualise is this. If I do a spot repair and I put filler in a dent for example and sand outside of the repair with 320 grit lets say so the primer can stick as I will only put primer on that repair and the surrounding area and then repaint the whole panel. Don't I need to make sure that I don't put primer on the old clear coat? I keep seeing YouTube videos where people have new paint and primer land on the old clearcoat that isn't even dulled down, it's still shiny. I thought putting paint on clearcoat or primer on clearcoat is a bad idea because it won't stick. So in this scenario it's a bit different to mine but imagine someone doing a spot repair and only painting that small section of repair but the new paint is landing on the old clearcoat. What am I missing?
×
×
  • Create New...