Standard Injectors Not Pulsing

[gtiburge 0]

hi i have very nearly finished returning my 1988 gti back to 1.9 8v from gti 6 but i seem to have a problem with the injectors both wires seem to show 12v and as i understand it one should b 12v and the other should b negative switched by the ecu to make it pulse, do the injectors get any other signals other then the ecu as it seems like something is missing ?? when i tested the injectors with a (bulb) in the end off the plug it didn't flash at all until l stop'd cranking and then at the very end it flashed once it all seems very odd

 

dose any one no what each wire from the ecu plug dose as it would b helpful as i could then check wiring i need them identified by colors and ecu pinouts as i have no number's on my wires due to them being cut by previous bloke bodging in the gti6 engine

 

any help much appreciated

thanks

olly

 

 

[Anthony 1,003]

Do you have a spark?

[gtiburge 0]

Do you have a spark?

yes i have a spark the wiring is a bit of a mess as previous person mutilated the loom it makes me think that something is missing

[unariciflocos 49 1 Cars]

As far as I know the injectors are all supplied with +12 and the ECU just grounds each one. Depending on the duty cycle and the size of the bulb you may not see anything as it will be PWM.

 

Just check that you have +12V to one pin of all your injectors and that the other pin has continuity into the ECU plug.

[gtiburge 0]

As far as I know the injectors are all supplied with +12 and the ECU just grounds each one. Depending on the duty cycle and the size of the bulb you may not see anything as it will be PWM.

 

Just check that you have +12V to one pin of all your injectors and that the other pin has continuity into the ECU plug.

i have 12v but at both wires ​ and i have no brown plugs as those where cut off by previous person i have solid wire with no plugs , do u no what color wire is for the injectors at the main ecu plug i ve been trying to find what each wire dose what at the ecu plug but i need to identify them by color as i have no numbers

[jackherer 543]

i have 12v but at both wires

That's correct, as unariciflocos said they are operated via PWM which means the ECU wire is grounded in rapid pulses so a multimeter is useless.

 

You either need an oscilloscope or just check continuity back to the ECU plug as already said.

[gtiburge 0]

Even if I follow it back I don't no if it wright as I don't no what ecu wire dose what as I dont hav any wire numbers because they hav been cut off

[jackherer 543]

You don't need wire numbers. The wiring diagram in the Haynes manual shows the pin numbers for the ECU plug, one pin on the ECU plug splits four ways and is connected to one of the pins on all four of the injector plugs.

[gtiburge 0]

all sorted ! cheers all

[large 33]

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