kjdakilla

I realize this is a topic that has been beaten to death. So let me go ahead and "pre-thank" anyone who makes an attempt to help me out.

I have been having the same problems as alot of other guys with the stock oil pressure gauge. I have a freshly rebuilt/bridgeported engine. s5 with s4 exteriors. When i say fresh i mean it doesnt have a single mile on it yet. I had some clutch/trani problems that i recently fixed. Once i scaled that problem, i crunk the car up and the oil pressure gauge was at a normal reading but as the car warmed up the oil pressure went up also. It went extremely high, pegged out. So i cut the car off came in and hit the forums. The next day i went and crank the car again but this time the gauge went immediately to max oil pressure before i even spun the engine over. I figured it had to be something crazy like wiring or something so I came and did some more reading and researching here on the forums and it has led me to 2 things.

1. it could be that my gauge is wacked out cuz of old/bad wiring

2. could be my oil pressure sensor wiring is not right

So i was looking for the wires that everyone talks about thats right below the oil filter and oil pressure sensor. I found the red/yellow wire. it looks to be connected properly. It is pictured first. Is this one for oil/water?

The second pic is a black/red wire that i have no clue as to where it belongs.(big green arrows) Its obviously broken. What is it and where does it go? Could this be the wire that is supposed to be grounded on one of the slave cylinder bolts? There is also a wire that i read about in another thread that is supposed to connect on the end of the oil pressure sensor?

I basically just want to know if im headed in the right direction here. Like i said before any help would be greatly appreciated.

misterstyx69

iTrader: (142)

the one that is supposed to be grounded to the Slave has a Capacitor looking thing on it...it looks like a Chunk of Black Hash,with a Eyelet on it for the bolt to go through.then it goes to the Firewall.
Is the oil pressure sender wired into the wiring harness(as in Connected up?)?.if Not look through some other threads and find the Wiring color and see if you can get it connected back up.
..If you feel comfortable,Try this:If you can,get a buddy to start the car up,while you Touch that Wire to the Sender.See if the Gauge will Respond when you do that.

clokker

iTrader: (2)

Your first picture shows the water temp sensor and indeed, it looks to be properly connected.
That picture also shows the oil pressure sending unit (directly above and commonly described - for reasons unknown to me- as "mushroom shaped")...and obviously, not connected at all.
This should be adopted as the new official forum description.

kjdakilla

Lol.. Most definately should be the official description! Whats even more funny is i knew exactly what he was talking about based on that description!

The problem i have now is the part that connects to the oil pressure sending unit is no where to be found on my car. Ive been doing some reading from other threads and it seems that most people lose or take off the part that bolts to the slave cylinder. (i cant find that part either) But im tryna figure out what the heck coulda happened to this piece that connects to the mushroom sending unit thingy? I looked down by the starter as stated in other threds to see if it was hanging down somewhere but i couldnt find anything. Only the wire that i have pointed out in green and one other black wire that is in the same cluster with the starter wires. It has a connecter on one end and its broken off on the other.

I will look again tomorrow in the daylight. Most likely whatever connecter is supposed to be there has broken or fell off. What do u guys suggest in the case that i find just an opened end wire? wrap it around the end of the oil pressure sensor? I think i may try misterstyxs' method and touch the wire to the sender.

misterstyx69

iTrader: (142)

..so,did you hook up the Hash thing to get the Mushroom to work?
(did you find the capacitor and hook up your oil sender??).....God,I kill myself sometimes..haha!

kjdakilla

I found the wire that the capacitor used to be hooked up to but it looks to have been taken off. I took your advice and touched the wire around to see if the oil pressure gauge would move and it did. Wheneva u touch it to a ground it maxes the gauge out. But when I touch it to the end of the oil sender the gauge maxes out too. I know there are 2 wires involved here. 1 for the ground on the slave cylinder and one that goes on the oil sending unit. The one I have been touching around is black and comes of the same line as the wires going to the starter, I think this one goes on the oil sending unit but I don't know what the connector looks like that attaches to the end of the "mushroom". Sorry if I'm makin this harder than it should be.

Icemark

No, it is not a ground that goes to the slave cyl.

The condenser (some people refer to it as a capacitor- but Mazda calls it a Condenser in the manual and auto parts books/microfitch) modulates surges for the oil pressure sender.

The gauge will work without it, however if the sender fails, the gauge will burn up without the condenser hooked up properly. So it really needs to be hooked up and the wire hooked up too it (but the wire should not be grounded which will also burn up the gauge- only the tab end of the condenser should be hooked up to ground). (BTW there is another condenser at the trailing coil if you need to know what it looks like).

Now as far as the Yellow/Red oil pressure wire and terminal for the oil pressure sensor, it looks like a regular slide on tab connector, except that it has a slot that allows the connector to slide parallel to the sender/block onto the mushroom tab of the sender.

Kinda like this:



So see the connector and tab in the top picture. It slides up and on as shown in the bottom picture. So the Yellow/Red oil pressure wire attaches on.

And your bump has been deleted. Bumps are forbidden in this section of the board. Why do you think your question is more important than anyone elses?

wvumtnbkr

according to page 50-116 of the FSM, the Y/R (yellow wire with a red stripe) is your oil pressure sending unit wire.

You have that wire hooked up to your water temp sensor.

I think the water temp sensor should be a "bullet" style female plug.

Hook the Y/R wire up to the oil sending unit and your pressure should be golden.

Damn, I had you beat too! (Icemark)

I believe a Yellow wire with a white stripe should be attached to the sensor you have your yellow / red wire attached.

wvumtnbkr

I am not sure on this, because I am having trouble with the Black/ red wire myself.

I believe this wire attaches to one of the sensors on the oil pan. Check to see if you have both hooked up.

Icemark

Yeah, but only because I had to go back and draw the guy a picture, because clearly he wasn't getting how the tab and wire connector worked when he had it on is water sensor.

kjdakilla

I understood how the connector works but thanks for taking the time with the pic. I was mainly confused about the wire in which the condenser had been taken off because it was just an open wire that moved the oil gauge when i touched it to anything in the engine bay. So cuz it moved the gauge i thought it was the wire that goes on the oil sender but thanks to u guys i have the correct info and i recognize my mistake.

Thanks again for the help and sorry about the "bump". I have just started back searching these forums alot and in 06 when i first became a member it wasnt really a big deal. So i didnt realize it was banned here. But now that i think about it, i dont remember seeing people do it on the 8club either...

Icemark

No worries

91 rx7

iTrader: (2)

duuuuuude you are a fucken genius. God why didn't post that picture since the first question i asked. it's working now

Icemark

Because I just drew it yesterday

eage8

iTrader: (9)

while we're on the topic... (kind of)

where does the other end of the water temp sender connect to? I know it goes into the wiring loom, but for some reason I don't think I have the wire anymore. where does it connect on the other side when it comes out of the loom?

91 rx7

iTrader: (2)

hahahaha that was a clevar idea i appreciate the time you spent drawing that picture. thanks man

kjdakilla

I've been doing some research on this exact question. I got the oil pressure gauge working but now I gotta figure out where the other end of the water temp sensor goes cuz I don't have another wire in that area that looks like it would go there.

91 rx7

iTrader: (2)

i'll take a look on my car and tell you tomorrow it's much better in the sunlight

wvumtnbkr

It goes to the emissions harness and through the firewall on the passenger side (USDM).

Just to be clear, the oil pressure sending unit wiring and the water temperature sensor wiring are on two seperate harnesses.

The water temperature sensor wire is yellow with a white stripe.

HAILERS

Is there anything *funny* about this car? Like a conversion from n/a to turbo?

eage8

iTrader: (9)

my water temp wire disappeared/got ripped out when I took out the battery cables when I relocated my battery... I have no idea where it went

it's not that big of a deal because I have an aftermarket water temp gauge, but the stock one is in a better place to see... even if it is a crappy S5 gauge.

HAILERS

Like the man above said, the Y/W wire runs in the EM harness....crosses from the left side of the engine to the right side and enters the crew compartment on the right side. In the right passengers side there is a plug with the reference designator X-11. The attached jpg shows the general location.

I'd cut the wrapping off the EM harness in the general area of the water sensor and find the Y/W wire. Then attach a bullet connector to that wire and put it on the sensor.

Jpgs out of a series five FSM wiring manual.

eage8

iTrader: (9)

wow, I definitely missed his post all together, thanks hailers. (and wvumtnbkr)

That would definitely explain it seeing as how I don't have a the stock emissions harness anymore... I'll have to look up there and see if I can find the X-11 connector.

kjdakilla

on my car? no, nothing "funny" other than what seems to be a serious HACK job on the wire harness! it seems like someone attempted a super bootleg wiretuck on this thing. Im having a hard time finding any of the proper connectors. Only a bunch of cut wires.

-if that question wasnt directed towards me then forget everything i just said.