Hello,

I´ve got my 1993 Big Bronco since October and now I have finished my restore work on my Bronco.
The motor is a 5.0L EFI V8 gas engine.
But now I have some problems and I need your help!

1)
One of my biggest problems, is the fuel gauge. No matter how much gallons I put in the fuel tank, the fuel gauge doesn´t show anything.
Sometimes, when the ignition is shut off, the fuel gauge shows 1/4, but if I put the ignition in ON or START position, the fuel gauge goes down to zero.
I don´t know what to do with it, or where I can search for demage or another problem.
Where, on which conector could I messure the resistor from the fuel tank level, which shows how much fuel is in the tank?
Or could it be the FDM (Fuel Delievery Module)?

2)
My second problem is the oil pressure gauge. Where on the motorblock could I find the sensor or oil pressure switch, which give out the oil pressure for the gauge? My oil pressure gauge doesn´t show anything and the pointer don´t move no matter what I do.

3)What is the Engine Spark Knock Intensity sensor for?
Is that sensor also used on my 5.0L? Where can I locate that sensor on the engine?

4)
After I have finished my work on the engine I put it into the Bronco, than I connected all the hoses, tubes and cable, but now I have got one connector which is located nearby the powersteering but I couldn´t find a place for that connector.
What could that connector be for? Or is it an optional connector for the 5.8L engine?


These are four of my questions, I hope anybody could help me, or give me some tipps.


Greetings Michael

 

i think this is it...


Looking for this? The oil sender with the wiring removed.
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So Where's The Sender? It's not so hard to find really. From the front of the car, look down the front of the engine, betwen the water pump and power steering pump. You'll see the oil filter down there. Just above the oil filter there's an indentation in the block. At the front of that indentation is a bracket with an electrical harness of some kind on it. Behind that bracket is a cream-colored cylindrical thing with a wire attached. That's the oil pressure sender.

 

1) Fuel sending unit...most were located in the gas tank. Common problem. Float bowl will get a hole in the float and fill up with gas = which makes it look like you are on E. I have the same problem...I have to rely on the trip meter method. I figure I can go 220 miles safely between refills.

2) I almost think your #2 and #4 question could be related. That sounds like the wire that goes to the OIL Pressure sending unit. Is it red...almost like a mini spark plug wire? On an 86 at least it looks like that...also on an 86 the sending unit is shaped like a bell. Let me see if I can dig up a picture....



Should be by/near your oil filter...if you locate it you may be missing the plug that goes on top...the extra one you talked about.

3) Errr I don't know....get a hanyes manual or someone on here can answer that question...most likely Greystreak. He's the man when it comes to that stuff.

4) See answer #2.

 

buy a haynes manual it will show you were everything is.

 

Thanks guy´s!

Thanks for all the pictures and the very good discriptions for the place of oil pressure sending unit!

I think I will find it now.

The only thing I don´t understand, the oil pressure gauge is only functional with one wire?
I thought the gauge could only point something if I have two wires?

What is the connector (question 4) for? The connector got two wires.

The Spark Knock Intensity sensor, is placed on the middle back of the engine block under the intake manifold.
I don´t know what the sensor is for, but I don´t have it.
I only have made a bolt in there, but I also have a connector with two wires on it nearby the sensor.

What should I do now and where can I get that sensor?

Michael

 

It's grounded to the block.

As far as extra connectors, I am not sure exactly what you have, but my 90 has some connectors under the hood that are not used. I wouldn't worry about it, if you never unplugged something from it.

 

Hallo JBronco!

Well I was wondering about open connectors because I completly restore the engine and some very important parts where missing from the beginning I bought the Bronco.

I have had some telephone calls with the guy I bought it and he told me that the Bronco was dismantled by two different garages and so some parts where missing without a trace.

The first time I´ve seen the open connectors, I thought the engine wouldn´t start/turn if I don´t have the sensors or open connectors, so I thougt about asking all of you guys here in the forum.

It is very helpful for me because in Germany you don´t have very much persons you can call about trucks like that.

By the way, in April I would like to visit California for about four weeks, to buy some spare part for my Bronco.
Where are the best shops for buying spare parts, aftermarket parts like runningboards?

I am looking forward to get some addresses for my holidays in California, maybe for visiting some of you here in the states.

If someone has addresses or other informations about it, please let me know it.


Greetings Michael

 

The open connectors could be for diagnostic equipment. My 88 has two open connectors on the drivers side for this reason.

Don

 

Hallo dwoodler

You´re right about some connectors for diagnostic equipment, but these connectors are bigger than the open connectors I am looking for.

I am looking forward to find out something about the connectors, than I will post it here in the forum!


Michael

 

Can you post some pictures of the connectors? That would be helpful.

As far as getting parts, while I do not know of any specific places in California to get Bronco parts, I'm sure that there are some - and California is a good place to get parts from because vehicles don't really rust there.

 

Question #1) The yellow/white wire from the in-tank sending unit feeds the gauge. The black wire is the ground for the sending unit. The other two wires from the in-tank unit are the power and ground for the pump. Best guess would be a faulty ground or bad sending unit. The location of the ground is the top of the upper radiator support at the left front of the engine compartment.

Question #2) Has been answered but your question regarding how the sensor only needs one wire to communicate pressure relates this way. The gauge changes reading based on changes in resistance through the sensor to ground. Since the block is grounded (neg) the single wire relays changes in resistance between the block and the connector when the pressure from under the sensor changes the resistance value of the sensor.

Question #3) Knock sensor on 5.0 and 5.8's is BEHIND the lower intake plenum at the top of the engine darned near mashed against the fire wall. Its a PITA to get to but, its function is to measure seismic (yes vibrations) in the engine during operation. If it detects spark ping or "knock" it changes resistance value which retards the spark timing to compensate. You can tell if its working properly by warming the engine to op. temp. then with it idling, give the block a sharp blow with a hammer (preferably somewhere it won't do any damage). If the idle drops, the sensor is working, if not, try tapping closer to it until idle changes. If it never changes, chances are the sensor is defective.

Question #4) The connector near the PS pump...is it a two wire connector that is nearly flat? I'd be willing to bet its the connector for the AC clutch on the compressor. If so, its mate is near the top front of the compressor and easily missed since the pins are recessed into the body of the comp.

 

Greystreak92 the 5.0 has a knock sensor the 5.8 does not. so that connector wont have a home.

 

The wires you describe are only the wires from the fuel tank or not?

Well I think that wires are going together into one of the big cable harness which ends nearby the Powerdistribution box.
I don´t want to put out the fuel tank only to get to the fuel gauge sending unit wires.

Is it easier to get the wires direct from the gauge in the dashboard, without taking the whole dashboard appart?

I´d like to messure with the informations I get from you, before taking the fuel tank and sending unit appart, only to find out that it wasn´t the problem.

Now I really understand how the oil pressure gauge is functioning! Thank you for the very good description.

I think the oil pressure switch which I installed on my engine is not exactly the right one, because I bought it in a Ford garage in Germany.
The german oil pressure switch has not the original connector like the US one, but I am looking out for the original US oil pressure sensor.

That is what I´d like to know!

At the moment I haven´t installed that sensor, because I didn´t know if the connector is optional for the 5.8L engine only. But now I know it.

Where can I get parts like that sensor, which dealers do you prefer?

Well I´d like to check that on Friday afternoon!

@JBronco

I ´d like to take some pictures from the open connectors from my Bronco to post it here on the weekend.


Michael

 

you dont need a knock sensor for a 5.8 so dont worry about hooking it up

 

@Kemicalburns

I´ve got a 5.0L V8 engine.


Michael