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

falky929

By falky929,
in Engines & Forced Induction

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falky929 Rising Star

falky929

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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

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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
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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.

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