lukec53

So for an introduction I'm swapping an S4 Turbo engine into my '88 RX. From looking where things went on the old engine, I've been able to hook up pretty much everything... except for a couple hoses and a wire.
First one is a hose connector on the intake manifold, it has no hose on it so im not sure where to look for the other end Its a fairly large one, the same size as the hose (right ahead of it) that goes to the air pump. I figure its too big to be a vacuum hose...

Second: I noticed a loose wire on the same side (passenger). Its black and has a single prong connector, comes out of the engine wiring harness right at the edge of the engine.

Third: On the intercooler... theres a small hose, which i know where it goes, but then theres a larger one also. Im not sure where the larger one goes. (could it possibly hook to #1?)

These are the ones off the top of my head.. I'll keep the list updated and maybe post some pictures if you guys dont know what im talking about.
Any help would be great!!

J-Rat

iTrader: (2)

Are you changing the ECU?

JerryLH3

iTrader: (11)

Pictures of a very clean S4 TII engine bay (not my car, using as reference):

https://www.rx7club.com/showpost.php...&postcount=444

That should help you with your third issue. The second issue sounds like O2 sensor, at least that's what I think of with a black wire and a single pin connector.

lukec53

So i wrote a reply yesterday but apparently it didnt post. But anyways, thanks for the pics, I've been looking for something like that. It should help with the intercooler pipe. I'm going to take some pics tomorrow when I'm at the shop though to give everyone a clearer picture of what I'm talking about.
I am changing the ecu, I have the TII ecu in the car and plugged in already, using the turbo engine harness, and the other two are left from the NA.

PS: sorry for the couple days delay, just graduated so i was pretty busy, i'll be checking this every day again now though

lukec53

hi again, sorry its taken me so long, but ive finally got some pics for you guys, ill do them in a few posts.

the first one is a yellow wire coming from the back of the engine. its got one of those thin round connectors on it. any ideas where it goes? i thought maybe i forgot one of the ones that goes to the tranny but theyre all hooked up.

the second is a black wire coming from the engine harness. someone suggested O2 sensor and that makes sense to be but i thought id take a picture anyways just in case someone has a different idea.

lukec53

the first two of this group are this mystery pipe coming out of the side. its not the one that goes to the exhuast, that is right below it. im stumped on where it could go, so any suggestions would be great.

The third is what i have my fuel pressure regulator vaccuum hose hooked on to. now im not sure if this is correct, it just was my first guess because the line on the end was about the right length for the stock fpr. is this the right hose to attach it to?

lukec53

these last two pics are for a few reasons.
first, the bendy hose sticking out of the top of the engine, from the intake manifold. I'm assuming this goes to the bigger hose on the intercooler? in both pictures there are green arrows, they point to the hose and where i think it connects.

second, in the first picture, is the red arrow hose hooked up properly? from the looks of that fc jerryLH3 posted, it looks like theres an extra connection there, i could be wrong though.

third, in the second picture (the one of the intercooler) where does the red arrow pipe go to?

lukec53

one more question, on the drivers side of the engine, where the fuel lines connect to the engine, there are 3 pipes coming out of the engine... ones fuel in, ones fuel out, and the third i have no idea. does anyone know where this attaches?

lukec53

so today i finally got the chance to try starting the beast. i plugged those two pipe connectors last night because i never did find out where they went. that yellow wire still doesnt have a home... i hooked the black one up to the O2 sensor. i put some oil and coolant in it and turned it over today.. no luck. I have fuel (im not 100% sure there's enough pressure, but there IS fuel at the rail.) and i have spark.
I need some help on troubleshooting this. I dont really know where to look after i know i have fuel and spark.
list of things not attached:
yellow wire on driver side with round single pin connector.
theres one white (6 prong?) plug under the dash from the engine harness that was not on the NA harness so it has no place to plug in. I'll upload a picture as soon as my camera batteries charge.
as seen in the earlier pictures, the biggest pipe connector (now plugged)
the bigger tube off the intercooler (now plugged)
a small ground wire with a little black box where it bolts on. (wire broke off, ill try soldering it back on, ill also upload a picture) i think it goes on the bolt for the clutch slave, just to ground. comes from a big group of wires on the driver side.
everything else is hooked up now... anyone have any ideas?

HAILERS2

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lukec53

HAILERS2, or anyone else, what is the peice that i circled in the picture? and do i need it in order for the engine to run?

misterstyx69

iTrader: (142)

the yellow wire is a Temp gauge sender or Oil sender wire( hook up around the Oil filter pedestal,rear iron/driver's side).
The wire that had a Black "box" on it(went to bolt on clutch slave)..did it look like a ***** of Black Hash with an eyelet?..then that is for the oil sender gauge,(it is a capacitor that smooths out the signal to the gauge)
Warning: Do not ground that Out!.you need the Capacitor thingie..see if you can get another.

RRTEC

iTrader: (13)

I bet your fuel lines are reversed..... Or you hvae abad ground to the injectors that is causing them not to fire.

lsmsc

The lower left is fuel IN, the lower right is fuel OUT. The upper on is going to the charcoal filter at the other side of the engine bay.


It's the accelrated warmup system. I'm not sure if its needed, to start but it helps...
From this, there is a hose going to one of the Intercooler inputs...

lukec53

ok first things first, thank you to everyone who's helping! this is great im finally making some progress .

misterstyx69 : I have the oil pressure sender already hooked up, so maybe its a temp sender... but what temp would it go to? i thought the only temp on the engine was the water temp on the rad/rad hose? i noticed my NA had a temp sensor in the oil pan, but my turbo engine only has the oil level sensor (hooked up) so no temp sensor there, is there any im forgetting? does it have an intake temp sensor? if so, where is it located?
for the black wire, yes it does look like that. and oops... i just put the eye on an already existing ground... did i wreck it? and where is the eye supposed to bolt to?

RRTEC : Funny story actually, my fuel lines WERE actually reversed. but i fixed that and still not starting. so now the fuel line is hooked up properly for sure. I took the plug off the rear injector by the FPR and stuck an LED light in it, turned the engine over and the light flashed, making me assume that my injectors are firing.

lsmsc : thanks for the info, i now have my fuel lines in proper order. and that AWS peice, i wouldnt think that would prevent it from starting.. Anyone correct me if im wrong?

lukec53

Also, this morning i made myself a set of lights for testing the error codes. the one light had one long blink and two short ones. ok so that indicates code 7, which is my boost/pressure sensor on the passenger strut tower. It got taken off with my air control valve. so i put it back on and hooked it straight to one of the vaccum lines coming from the manifold.

is there a way to reset my codes without a real code computer? i tried disconnecting my battery for a while but still shows code 7.

satch

iTrader: (1)

The ECU doesn't store codes on an S4. The sensor you speak of should have a Brown/Red wire that should read 2.5 volts w/key to on and the vacuum hose disconnected. Does it? And is this a Turbo Boost sensor or the one from the original N/A setup?

lukec53

satch i tested the pressure sensor (which IS the turbo sensor not the one from my NA), the brown and red wire has 12 volts when tested between that wire and ground on the body.

satch

iTrader: (1)

Was the plug connected to the sensor at the time you read 12 volts on the Br/R wire? W/key to on the B/W wire is supposed to be 12 volts, the Brown/White is supposed to be around 5 volts and the remaining wire is the ground.

And since your sensor is the turbo version it should read between 3.5 to 4 volts and not the 2.5 volts mentioned earlier.

lukec53

ill give you a better rundown on these wires so you can have it all.

key on, plugged in to the sensor:
brown/red:12V
brown/white:5V
black/white:12V
black: .03V (probably just ground)

exacts same readings with key on, unplugged from sensor.

satch

iTrader: (1)

The reading of 12 volts on the Brown/Red wire is way off from spec. The sensor is supposed to output a signal to the ECU as the ECU sees it as an input signal. There is a Blue/White wire which taps into the Br/R wire to feed the boost gauge in the dash. The Br/R wire runs to pin 2B. You might want to disconnect this particular ECU plug and check the voltage on the Br/R wire at this ECU plug (again, disconnected) w/key to on. If it reads 12 volts again then you might have the boost gauge wire (L/W) hooked up wrong.

Read post #7,9 and 10 by Hailers in the following link as a possible explanation to your problem.

https://www.rx7club.com/showthread.p...hlight=tps+rod

lukec53

HAILERS !! it sounds like your the person im looking for. i have a question for you (well, probably more than one :P). I just read the posts you gave on the link satch just gave. So with my setup, i have the turbo computer, turbo engine harness (with the turbo pressure sensor and AFM), and everything else is from the NA.
Im a little bit confused on what you were saying there but as i understand it right now, if you take the turbo harness and cpu and mate it with the non turbo car, the plugs will plug in, but the wires dont necissarily line up with the right ones, correct?
what do i need to do in order to get it running? is it just a matter of moving wires on the plugs to mate with the proper wires?

lukec53

PS. I dont think i told you guys that i took off and made block off plates for the BAC valve and ACV to make life a little simpler. from what i read these shouldnt affect it from starting.

PPS: Did i mention that its not firing whatsoever? never a pop or anything.

lsmsc

I had to play a little with the ignition timing to get it starting. If it's to far off, it will not work...

lukec53

yesterday i had a timing light out and got the line on the leading plug as close as i could. it might not be perfect because the engine is supposed to be running, but i think it should be close enough to fire.