TweakGames

iTrader: (3)

hey all, about to fire up the new engine but cant figure out these last 3 things.
1. Where do these go? Im guessing they are for fuel ... Where / what do they plug into?



2. Where does the exaust temp sensor (guessing thats what it is) plug into?




3. What is this? haha I have it sitting here... but no clue where it goes. Most likly already have it installed ( I might have had a second one ... )




THANK!

TweakGames

iTrader: (3)

Also, what is that little thing under the oil filter? There was a connection on there, but the new engines plug in was really F'ed up. Do I need to plug something in to there? If so im going to have 2 take it off my old harness. Thanks.

dirttracker64

Pic #2 is your o2 sensor. There should be a plug there for it just search your wiring harness till you find it


This an s4 or s5 n/a

1POINT3

in the 1st picture thats part of your fuel system there should be 2 hoses that slide onto those..

in the 2nd picture thats your oxygen sensor there should be a a plug around the same area(sry for the bleek discription on location)

in the 3rd picture my vote is for the heater hose that comes out of the firewall and plugs into the fitting near the oil pressure sensor....

and for your question....that little thing under the oil filter?...do you have a aftermarket pedastal? if not the thing with the gold bell looking thing on it thats for your oil pressure...look in a haynes manual or factory service manual....or search around here


Bryan

sry i couldnt be more descriptive

T-Rav15

Ok, I just put an engine in so, in the first picture, the line on the left in your picture is the fuel feed line, the hose from the fuel filter will hook up to that one, the other is the fuel return which I think goes straight to a metal line that runs straight down the firewall and to the gas tank. The second picture is of the O2 sensor I believe, not temp, and that green connector goes to a wiring connecter that comes off of the wiring harness that runs under the intake manifold. Mine was kind of yellow, but they all of the connectors only had 1 match so you should be able to find it. No idea on the hose, heater hose maybe? See if it matches the shape of any of the hoses on the engine.

Zokus

The first picture is where you need to hook up your fuel lines.

The third picture is of a coolant hose. You hook it up to the white/yellowish plastic nipple on the throttle body. It's on the firewall side, and it goes to a nipple on the rear iron of the engine core next to the Upper Intake Manifold. If you cant find it, crank the car over and look for the spewing coolant lol.

Are you talking about the oil pressure sender being that little thing under the oil filter? It's roundish and has a little flat clip on the middle of it?

Omixeo

iTrader: (1)

That is indeed the heater hose that connects to the firewall. I just replaced one last week. It connects right next to the oil filter.

NeCr0mStR

iTrader: (3)

here is help with the coolant hose.

O2 sensor is in the red circle

hope this helps

TweakGames

iTrader: (3)

could someone get me a picture of the other side of the engine? I still cant find where the gas in and out lines go ... / dont know what the hoses look like. I dont have any other hoses sitting here so im confused. hehe. Thanks.

Digi7ech

iTrader: (1)

No it's not.

It does not have the correct bends to be the engine to firewall line.

Like said above.
It is the Coolant line for or from the throttlebody.
From the length it is most likely from the TB to the rear iron.

You should also have a Waterpump housing to BAC and then BAC to TB coolant line as well.

An alternative to this is to remove the coolant and cold start system and do the TB mod. Then cap the rear iron coolant hole and the waterpump hole.
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The first pic are the fuel lines. I'm not sure which is which since I no longer have the rats nest but You will find 2 3/8th size rubber lines on the drivers side fedner/firewall area. Under the brake booster.

The one which connects to the fuel filter right there is your feed line. The other is your return line.

If you trace those two paths on the engine you can find which is the feed and which is return.

The one coming out of the secondary fuel rail is the return line while the one going into the primary fuel rail(small short one bolted to engine block) is your feed line.
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Second pic. I'm not sure. I think your talking abou the vac nipple to the right of the O2 sensor and not the O2 sensor itself.

From guessing. There are only two itms in that area using vacuum.
The ACV and your Auxillary port activation.
Pull out a FSM and check those two section and it should tell you what it is.

Doing a search for 5/6 port or ACV with the word pic may come up with somethign as well.

Richter12x2

iTrader: (1)

If you're talking about the O2 sensor, my connector is almost dead center at the firewall near the rear of the engine. If you can't find it you may have to pull the manifolds again. After swapping an engine or two it gets to where you can strip the intake manifolds in about 15 minutes . If you're talking about the vacuum nipple, isn't that the pressure port that actuates the 5 and 6 port?

Oh, also, on the fuel lines, not all engines are created equal. For benefit of the doubt go with what the other guy said about which line goes where, but if the engine cranks and won't start and the exhaust doesn't smell rich, then the fuel lines are backwards. Watch out if this is the case though, because it'll build up pressure and pop a little when you swap them up. The fuel lines both come from the bottom of the car, from the driver's side of the transmission tunnel. The input side comes through the fuel filter that should be mounted on the firewall.

MaxRX7

yes, I agree. I 1st noticed this when I swapped engines. I had to connect them vice versa after I connect it the original way when it never started up. Put them the other way and booya. I don't see why it would be different if everything else was the same though.

Richter12x2

iTrader: (1)

Probably number 1 is that they're not attached to each other, so if they get tossed or leaned on or whatever, you can cross them over if you're taking the metal tubing spider off. Who knows, maybe it came from the factory that way. I saw a post once that said J-Spec engines were all one way, and North American engines were the other, but I don't quite believe that.

MaxRX7

yeah, I was running a search and just read about the Jspecs too. Oh well, both engines are US spec.

I am just double checking everything do to bad gas mileage. Looks like I'll have to change fuel filter and/or O2 sensor.

Richter12x2

iTrader: (1)

Are you running any kind of a fuel computer? I have a SAFCII and I basically take out 5% of my fuel below 3800 and then 12% above.

O2 sensors for the RX7 are cheap, so that's a good place to start. I don't know why they all seem to run so freaking rich. One of your sensors is probably bad though. When I bought mine, I was getting about 7-8 mpg. After replacing the o2 sensor and getting the computer back into closed loop, I was getting next to 20 mpg. That was before the SAFC - once I get my new harness installed, I'll dyno tune it and get it where it needs to be, then I'll see what the MPG is.

TweakGames

iTrader: (3)

Is it weird that I chagned my fuel filter and my gas milage dropped considerably? I have tons of power higher RPM, but my gas milage went from like 15 to 10.

Richter12x2

iTrader: (1)

Not too weird - I did the same thing with a cold air intake on my Neon - changing the air filter improves gas mileage - putting your foot in it because you like the push and the sound it makes will make it go right back down again.

MaxRX7

Well, in my case it is messing with my head. Everything is pretty much stock.

I bought a 88 with a blown engine and was driving a 86 at the time (both GXL's for what it's worth). The 88 is in 10xs better shape so I swapped in the engine from the 86. I left the entire wiring harness intact, I removed the very minimum, I onlt took the transmission out seperate because I put in a new clutch. I used the same hoses, plugs, belts, sensors, but I did put in a new fuel filter. Here is way I am disappointed. When the engine was in the 86 I was getting 260 miles on a fuel tank until the add fuel light went on. Now in the 88 I was getting 120 miles to the tank in the same conditions and after some tinkering I got 160 miles to the tank last time.

So doing the math I used to get ~17mpg, now I get ~10mpg. So the only difference is a new fuel filter, maybe I didn't plug something in while I did the swap? All I know is the car runs great, always starts up on the girst try, no warning lights, everything is perfect other than the fact I get **** poor gas mileage.

Richter12x2

iTrader: (1)

Unfortunately, I don't put a lot of stock in pre OBD computers for reporting codes correctly. When my O2 sensor was completely disconnected, my check engine light never came on in the RX7 - so just because you're not getting a CEL doesn't mean everything's peachy.

In fact, if you still have both cars I'd try swapping the sensors, because if you're a sane person, you just unsnapped the o2 sensor connector and swapped the engine without swapping the entire exhaust or unscrewing the o2 sensor and keeping each one with the right engine. Or buy a new one, since they're single wire non-heating o2 sensors, they're only like $15, vs $80 for each of the 4 of the 4 wire o2 sensors on my wife's Mustang. :P

If that doesn't do it, I'd start swapping any sensors that you didn't move from car to car with the engine. Because all things being equal, the engine doesn't know what car it's in, and I can't image the ECU changed that much from 86 to 88.

On the other hand, my wife's car recently blew a head gasket from running too lean because an o2 sensor wire was broken. When I replaced the head gasket I ported the intake and heads. After putting the car back together, it ran slower than it did before, and got bad gas mileage. Then I had someone drop the exhaust and repair that wire, and in 5 minutes, I gained all the power and gas mileage back, plus the porting.

Since the o2 sensor was bad, the computer was running open loop. Worse, since the engine was down for the week with the battery disconnected, it was running open loop with a factory map (which was not only too lean causing the headgasket to blow, but now WAY too lean because of the increased airflow from porting) Once the o2 sensor was fixed, it went into closed loop and tuned everything to optimal.

RotaryEvolution

iTrader: (30)

dp

RotaryEvolution

iTrader: (30)

the fuel line to the front of the car is the feed line off the filter and the rear is the return line from the firewall.

MaxRX7

Yes I agree, you are a smart dude and I appreciate your feedback. My fault I didn't mention that I have the RB header/pre-silencer so it is the same O2 sensor before/after the swap. But yeah, I have both cars and going to replace one sensor at a time to see any changes. I just kind of grew fustrated because I did all the common sense things already.

Richter12x2

iTrader: (1)

I know that feeling well - I have a '92 Capri that hasn't run right in over a year, and it's probably a sensor. I've changed and swapped and tested everything I can think of, so I get fed up and walk away for a few months at a time.

lchaidez

iTrader: (4)

in the first picture, the left one goes straight into the fuel filter, and so on. thats the only one i know for sure because i just delt with mine.

im not going to assume the others, listen to these dudes.

matt566

does that 3rd pic hose come off the carcoal canister? if it does i think the hose goes under the manifold?!?!?