we found high s5 imp injector wired on s4 low ?help
06-19-08, 09:45 PM
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we found high s5 imp injector wired on s4 low ?help
my friend is running a 87 t2 VIN : H0516xxx so this must be the low impedance model
and we found s5 550 high injectors with oval plug spliced on the harness
and the resistor pack is present
the car have no hesitation and run very good !
so this can be possible? i dont understand
the best thing is to remove the resistor pack? what do you think?
and we found s5 550 high injectors with oval plug spliced on the harness
and the resistor pack is present
the car have no hesitation and run very good !
so this can be possible? i dont understand
the best thing is to remove the resistor pack? what do you think?
06-20-08, 07:59 AM
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Originally Posted by Rotary Resurrection
More about injector impedances on 2nd generations:
1986 and 1987 model cars used low impedance(2-3 ohm) injectors. Low impedance injectors have a center notch on the plug. The wiring harness used with LI injectors integrates an injector resistor pack, wired inline between the ECU and injectors(under stock air box) to bump overall load seen at the ECU to 12-13 ohms.
1988 and later models used high impedance injectors. 1988 HI injectors have an offset notch on the plug, and all post 1988 injectors are HI with an oval plug(until 3rd generation side feed injectors which are totally different). The wiring harness on these models deleted the injector resistor pacl, carrying the 12-13 ohm load from the injectors directly to the computer.
When performing engine/wiring/injector swaps, the type of setup must be noted and kept together. This is easy as LI injectors will only plug into a harness meant for them(due to the position of the plug notch) and vice versa for HI injectors and harnesses. 88 and post 89 HI injectors and harnesses are not interchangeable.
A car that previously ran one type of setup can be changed to the other…keep the injectors and wiring harness together. The ECU will not know the difference.
1986 and 1987 model cars used low impedance(2-3 ohm) injectors. Low impedance injectors have a center notch on the plug. The wiring harness used with LI injectors integrates an injector resistor pack, wired inline between the ECU and injectors(under stock air box) to bump overall load seen at the ECU to 12-13 ohms.
1988 and later models used high impedance injectors. 1988 HI injectors have an offset notch on the plug, and all post 1988 injectors are HI with an oval plug(until 3rd generation side feed injectors which are totally different). The wiring harness on these models deleted the injector resistor pacl, carrying the 12-13 ohm load from the injectors directly to the computer.
When performing engine/wiring/injector swaps, the type of setup must be noted and kept together. This is easy as LI injectors will only plug into a harness meant for them(due to the position of the plug notch) and vice versa for HI injectors and harnesses. 88 and post 89 HI injectors and harnesses are not interchangeable.
A car that previously ran one type of setup can be changed to the other…keep the injectors and wiring harness together. The ECU will not know the difference.
There should be nothing wrong enjoy!
06-20-08, 08:22 AM
#5
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It is possible to run it like this.
Not the best way, but it'll run and nothing will be hurt.
Try to reverse that and you'll end up with a dead ECU.
Low impedence fuel injectors without the resistor network will FRY the injector drivers on the ECU.
-Ted
Not the best way, but it'll run and nothing will be hurt.
Try to reverse that and you'll end up with a dead ECU.
Low impedence fuel injectors without the resistor network will FRY the injector drivers on the ECU.
-Ted
06-20-08, 09:03 AM
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HAILERS
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You could leave it alone.
Or since you KNOW the injectors are high and not low, go to solenoid resistor package and disconnect it. Put it on the shelf.
Then jumper ALL five of the wires in the plug on the front harness together. You now are wired like a high impedence car.
The resistor in the resistor package adds six ohms to each injector circuit, if left in place.
Another way of doing the above *jumper*, would be to remove the package. Cut the harness on that package in two. Put the resistor part on the shelf in the garage and keep the half with the elect plug. Then strip all five wires where you cut the harness in two. Solder or crimp all five wires together and cover with shrink tubing. Reconnect it to the plug on the front harness. Done.
Or since you KNOW the injectors are high and not low, go to solenoid resistor package and disconnect it. Put it on the shelf.
Then jumper ALL five of the wires in the plug on the front harness together. You now are wired like a high impedence car.
The resistor in the resistor package adds six ohms to each injector circuit, if left in place.
Another way of doing the above *jumper*, would be to remove the package. Cut the harness on that package in two. Put the resistor part on the shelf in the garage and keep the half with the elect plug. Then strip all five wires where you cut the harness in two. Solder or crimp all five wires together and cover with shrink tubing. Reconnect it to the plug on the front harness. Done.
Last edited by HAILERS; 06-20-08 at 09:16 AM.
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