HIrotary

Is it possible to use a NA motor harness on a original 1988 S4 TII car?

HIrotary

its hard finding a s4 tII em harness in good condition.can someone please answer my question i need to know asap, if its possible then i'll just use a NA em harness
thank you

KompressorLOgic

iTrader: (6)

yes it is. in my 87 t2 i am using an na passenger side engine harness make sure both harnesses are for the correct impedance injectors. so if ur car has low use a low harness. otherwise u might have to remove resistor pack or splice some in.

im also running with all emissions removed, then you will need to extend the tps wires like 8 inches and the bac wires like 2 feet. you also wont hav ethe knock control box but that doesnt really do much except retard timign if u use bad gas between like 2.2-3.5K or somethin

KompressorLOgic

iTrader: (6)

ohh yeah i should add if u have any of the emissions solinoides alot of those are wrong, and i havnt reaserarched how to rewire those cause i dont run any of that crap...( not even the twin scroll solinoid)

also the 2 big things, the tempurture gauge wont work, and neither will the boost gauge! you will ahve to jumper a wire over from the boost sensor to a diff wire that leads to the boost gauge, found near the ecu, then you do the same with the temp gauge,

its pretty easy if you compair both wiring diagrams, but ive forgotten which ones i did, but i did it about a year ago

HIrotary

thank you kompressorlogic!!!!
u pretty much answered all my questions, the emissions i dont have to worry i got them removed

HIrotary

found this link https://www.rx7club.com/2nd-gen-archive-72/s4-na-turbo-swap-details-813825/ do any one know if its vice versa to my situation, heres some clarification i have a 1988 TURBO II missing the whole motor including the motor harness, i got a new TII motor installed but no motor harness, now im trying to figure out if i can use a NA motor harness?

KompressorLOgic

iTrader: (6)

lol yes you can use the na engine harness.
that link is not really the same as your setup.

you do want to use all t2 electronics tho, ie boost sensor, afm, injectors, ecu.

reason is the body harness on an na and turbo are slightly diff also.

for your setup a t2 body, with an na engine harness.

you need to,
1. lengthen tps wires,
2. lengthan bac wires . ( if your using one)
3.remove all emission solinoides, ( sounds like u allready did)
4. run w/o a knock sensor, ( doenst do **** anyway)
5. cut and move the tempurature gauge wire like 6 inchs near the ecu
6. jumper the boost sensor wire from the engine harness over to the t2 body harness ( JUMPER, DO NOT CUT!!!, so basicly the boost sensor signal wire will beomce a Y one still going to the ecu, and then the other spliced to the boost gauge wire, all done near the ecu area)


i basicly had the same setup s you, but i have a 87 t2 and the engine harness was buchered beyond repair, so i used a good condition na harness instead.

HIrotary

okay okay ill stop worrying ,I just picked up a NA harness this afternoon,ill just have to have to wait till tomorrow to install it. kompressorlogic thanks alot.

88SE_HI

iTrader: (2)

Was wondering where you picked up the TII motor from?

HIrotary

take off my intake manifold today,i'll just have to wait till tomorrow so i can borrow my friends soldering iron, so i could extend the T.P.S pig tail

misterstyx69

iTrader: (142)

check the AIT connector too..you may just have to make one with female spades.

KompressorLOgic

iTrader: (6)

the ait are both the same, i didnt have to do any modification to that.

HIrotary

i found out that my injectors are high impedance, now i have to do the wiring that/u KOMPRESSORLOGIC mentioned above, i know hailer has a writeup on how-to splice it but cant seem to find it. Do any one have pictures or a link to the writeup? btw major thanks to everyone for helping me out.

HIrotary

bump it up.

HIrotary

nvm found it again here it is https://www.rx7club.com/2nd-generation-specific-1986-1992-17/we-found-high-s5-imp-injector-wired-s4-low-help-765219/