HELP! injector resistor box?

Hi,

Concerto project,

Now, i will be using the OBD1 injectors, loom, P30 ecu, dizzy, all from the EG B16A engine, does this mean:

1) can i run the engine without using an injector resistor box?

2) or do i have to use the EG B16A injector resistor box or the Concerto ones?

Since im not using any OBD0 parts and its all OBD1 everything, do i still need the injector resistor box?[/I]

ECU-MAN - i hope u can shed some light on this one!

Any help and info would help!! as ive done searching and still confuses a lil'

no, you wont need the reistor box

Quote:

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Originally Posted by heist

no, you wont need the reistor box

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Correct

Depending how you attack the wiring conversion,you'll just have to feed the power going into the resistor box (yellow/black usually) into the OBD1 engine harness directly,then cut the resistor box & the other 4 wires which supplied the old injectors out of the loom.

I found my OBD1 integra engine supplied injector power from the drivers side,whereas my ED9 crx injector box was on the passengers side(dunno if same for civic looms),but I just ran a wire from the teg loom connector on the drivers shock tower direct to the main relay,as it is also on the drivers side in the crx,prob the same for the concerto.In any elec application,wiring should be as short & as large & have as less joints as is practicle.So if same for yours,dont bother using/joining old wires unless the civic feed is on the passengers side.Just remember to cap it off or cut off at the ecu location to save shorts.

Dont forget this power feed like I did & spend a couple hours wondering why your engine doesnt start,theres nothing like killing the moment of cranking a new motor with a bit of fault finding.

just be carefull some OBDI injectors still use a resistor box,

if you dont know where they came from, its best to measure the resistance of the injectors and determin if you need to install the resistor

if the they measure

1.5 - 2.5 ohm then they are low ohm and need the resistor block ( 5 to 7 ohm )

the higher ohm resistors that dont need a resistor block are 10 to 13 ohm

measure your injectors before you just whack them in and dont wire up a resistor block.

I thought it was only the accord & prelude that kept using low impedance injectors into the OBD1 era?

Fairly sure only the gen 1 B16A had low imped injectors.

In any case,measure like ECU-MAN said,just to be sure,dont want no melting ecu's.

Quote:

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Originally Posted by CRXer

I thought it was only the accord & prelude that kept using low impedance injectors into the OBD1 era?

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yes thats right,

but its still nice to know for sure

Quote:

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Originally Posted by ECU-MAN

yes thats right,

but its still nice to know for sure

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kool thanks guys very informative info!!

spk to honbits and they said that EG B16A dont need resistor box,

ECU-MAN - thanks for the info but how can i check the inpedence/ohms on the injectors?

wot tools do i need besides the multimeter?

wot is the wire colour of the injectors to i use to test on? or do i test it on the Injector resistor plug? (bear in mind i dont have a resistor box, except the concerto ones)

and also do i need the wiring of the ECU all hooked up first prior to testing
the injectors?

Do i need to have the key on the ignition on and not start position ??

basically there has to be power on the injectors right?

So yeh its abit confusing how some people say yes i need one and others say no u dont coz its a later model engine and ecu.

Any confirmation on this would help!

Cheers!

Just pull the plug off the injector & measure across the 2 terminals of the injector & read what the resistance of the coil is(ohms) & cross reference with what ECU-MAN has posted.

ok so for example :

injector 1 - yel/blk -place the positive terminal of the multimeter here and then --> wht/red - place the negative of the terminal of the multimeter here and check the reading? is that how its suppose to be tested?

do i need to have everything on the ECU / wires all hooked up prior to testing right? do i need to have the key on ignition etc?

No key,no ecu,no nothing,doesnt matter which way multi probes are used just put one on each terminal of the injector with the plug taken off it.

If dont want to remove plug then one probe on yellow/black & one probe on the colour wire of the injector u are testing.

Quote:

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Originally Posted by CRXer

No key,no ecu,no nothing,doesnt matter which way multi probes are used just put one on each terminal of the injector with the plug taken off it.

If dont want to remove plug then one probe on yellow/black & one probe on the colour wire of the injector u are testing.

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ok sweetazz will do that tomorrow!!

as ECU-MAN mentioned if the ohms is:

"1.5 - 2.5 ohm then they are low ohm and need the resistor block ( 5 to 7 ohm ) <-- is this still classified as low ohms?"


10-13 ohms dont need a resistor block right - classified as High Ohms.?

:wave:

Quote:

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Originally Posted by XB-16-AX

ok sweetazz will do that tomorrow!!

as ECU-MAN mentioned if the ohms is:

"1.5 - 2.5 ohm then they are low ohm and need the resistor block ( 5 to 7 ohm ) <-- is this still classified as low ohms?"


10-13 ohms dont need a resistor block right - classified as High Ohms.?

:wave:

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correct,but the actual figures ive read are in impedance,which is a product of resistance & the reactance a coil has against itself to give a final ohm figure.

so i'm assuming its 1.5-2.5ohm impedance which would actually give a lower figure of resistance,because there is no reactance when the coil is inactive.

If all that confuses u,i have a set of both sitting in my garage & i'll give u figures on them tomorrow so u can compare