• Welcome Visitor! Please take a few seconds and Register for our forum. Even if you don't want to post, you can still 'Like' the posts that you read.

Oil level sensor bypass


MrSteff

New member
Joined
Feb 18, 2019
Messages
4
Reaction score
0
Points
1
Location
Fort Madison IA
Vehicle Year
1988
Make / Model
Ford
Transmission
Manual
I believe i have a bad oil level sensor on my 88 2.9l. It is causing a no start the oil pressure switch has been replaced and the pan is full. Any help would be great
 


Rock Auto 5% Discount Code: 4FF3E9EEA14805 Expires: October 1st, 2020

rusty ol ranger

2.9L Mafia-Don
Supporting Member
Joined
Sep 22, 2007
Messages
7,347
Reaction score
2,251
Points
113
Location
Michigan
Vehicle Year
1987
Make / Model
Ford
Engine Type
2.9 V6
Engine Size
177 CID
Transmission
Manual
2WD / 4WD
2WD
My credo
A legend to the old man, a hero to the child...
You sure thats whats causing it?

Mines just got the wires cut.
 

adsm08

Senior Master Grease Monkey
Supporting Member
Article Contributor
Ford Technician
TRS 20th Anniversary
Joined
Sep 20, 2009
Messages
33,842
Reaction score
2,963
Points
113
Location
Dillsburg PA
Vehicle Year
1987
Make / Model
Ford
Engine Type
4.0 V6
Engine Size
4.0
Transmission
Manual
2WD / 4WD
4WD
Tire Size
31X10.50X15
I believe i have a bad oil level sensor on my 88 2.9l. It is causing a no start
You are wrong. Chevy used to do that kind of stuff, but Ford never did, at least not on the 2.9.
 

rusty ol ranger

2.9L Mafia-Don
Supporting Member
Joined
Sep 22, 2007
Messages
7,347
Reaction score
2,251
Points
113
Location
Michigan
Vehicle Year
1987
Make / Model
Ford
Engine Type
2.9 V6
Engine Size
177 CID
Transmission
Manual
2WD / 4WD
2WD
My credo
A legend to the old man, a hero to the child...
There is an oil level sensor on the 2.9. It just wont kill the engine. All it does to my knowledge is trip the little check oil light.

Ive never ran one low enough to know though.
 

Mac

Well-known member
Supporting Member
V8 Engine Swap
Joined
Aug 9, 2007
Messages
5,101
Reaction score
179
Points
63
Age
73
Location
C. Wisconsin
Vehicle Year
2003
2000
199
Make / Model
Ford
Engine Size
4.0
Transmission
Manual
Just a level indicator, nothing more. Looks elsewhere for problem.
 

MrSteff

New member
Joined
Feb 18, 2019
Messages
4
Reaction score
0
Points
1
Location
Fort Madison IA
Vehicle Year
1988
Make / Model
Ford
Transmission
Manual
hmm well it wont let the fuel pump turn on, there is power to the relay the side going to the computer will not prime the pump. My theory was the computer wasnt letting the engine start because of info the sensor's where giving it. The oil light is on so makes a little sense to me, furthermore I did a little googling and it is common in other vehicles have not found anything on a Ranger. I understand i may not be able to wiring around it depending how the sensor talk the the computer. Is there anyway to test it though? I have gone threw all of the fuel system and checked to make sure wires where solid where i am missing the power i am covinced it is a sensor issuse as for which on i do not know. Are you sure the level sensor would not result in a no start?
 

rusty ol ranger

2.9L Mafia-Don
Supporting Member
Joined
Sep 22, 2007
Messages
7,347
Reaction score
2,251
Points
113
Location
Michigan
Vehicle Year
1987
Make / Model
Ford
Engine Type
2.9 V6
Engine Size
177 CID
Transmission
Manual
2WD / 4WD
2WD
My credo
A legend to the old man, a hero to the child...
Yes. The level sensor wont cause a no start.

So you got power to the relay but the pump isnt running?

The computer is what pops the relay off.

You got a bad relay or bad pump.
 

adsm08

Senior Master Grease Monkey
Supporting Member
Article Contributor
Ford Technician
TRS 20th Anniversary
Joined
Sep 20, 2009
Messages
33,842
Reaction score
2,963
Points
113
Location
Dillsburg PA
Vehicle Year
1987
Make / Model
Ford
Engine Type
4.0 V6
Engine Size
4.0
Transmission
Manual
2WD / 4WD
4WD
Tire Size
31X10.50X15
hmm well it wont let the fuel pump turn on, there is power to the relay the side going to the computer will not prime the pump. My theory was the computer wasnt letting the engine start because of info the sensor's where giving it. The oil light is on so makes a little sense to me, furthermore I did a little googling and it is common in other vehicles have not found anything on a Ranger. I understand i may not be able to wiring around it depending how the sensor talk the the computer. Is there anyway to test it though? I have gone threw all of the fuel system and checked to make sure wires where solid where i am missing the power i am covinced it is a sensor issuse as for which on i do not know. Are you sure the level sensor would not result in a no start?

The oil level sensor will not cause a no start. It just drops a float and grounds the oil light when you are a quart low.

There are actually no sensors involved in fuel pump priming at all on that truck.

In the passenger foot well, pull the carpet up at the firewall, you will find the inertial shutoff switch for the fuel pump.

Use a test light to check for power on the green wire when the key is first turned on. You may need a helper as it will only last a few seconds.

If you have power there jump power onto the pink wire and listen for the fuel pumps to run.

If both of those tests give you a positive result punch the inertia switch a few times and then push down on the little button oon the top.
 

MrSteff

New member
Joined
Feb 18, 2019
Messages
4
Reaction score
0
Points
1
Location
Fort Madison IA
Vehicle Year
1988
Make / Model
Ford
Transmission
Manual
No, I have already checked the inertia switch, but of course, I don't have any power to anything after the relay, I know the relay is good as well. like Ol Rusty ranger said the computer is what pops the relay off, I am not getting this at the relay. My ECU is not telling the pump to turn on.
 

MrSteff

New member
Joined
Feb 18, 2019
Messages
4
Reaction score
0
Points
1
Location
Fort Madison IA
Vehicle Year
1988
Make / Model
Ford
Transmission
Manual
would the oil pressure sensor cause a no start? I suppose I should be going through my wires making sure they are intact, The oil light may have nothing to do with the no start but no the less it is still on something is wrong with that system
 

ericbphoto

Old Redneck just wingin' it.
Forum Moderator
Supporting Member
U.S. Military - Veteran
TRS 20th Anniversary
Joined
Feb 7, 2016
Messages
6,834
Reaction score
3,655
Points
113
Age
56
Location
Wellford, SC
Vehicle Year
1993
Make / Model
Ford Ranger
Engine Type
3.0 V6
Engine Size
3.0L
Transmission
Manual
2WD / 4WD
4WD
Total Lift
6"
Tire Size
35"
My credo
In theory, theory and practice are the same. In practice, they are different.
Everybody is telling you the oil level sensor will NOT cause a no start in a Ranger. You have something else wrong. Time to look at the wiring diagrams.
 

adsm08

Senior Master Grease Monkey
Supporting Member
Article Contributor
Ford Technician
TRS 20th Anniversary
Joined
Sep 20, 2009
Messages
33,842
Reaction score
2,963
Points
113
Location
Dillsburg PA
Vehicle Year
1987
Make / Model
Ford
Engine Type
4.0 V6
Engine Size
4.0
Transmission
Manual
2WD / 4WD
4WD
Tire Size
31X10.50X15
No, I have already checked the inertia switch, but of course, I don't have any power to anything after the relay, I know the relay is good as well. like Ol Rusty ranger said the computer is what pops the relay off, I am not getting this at the relay. My ECU is not telling the pump to turn on.
So if you jumper across the relay the pumps run?

In that case I'd check that the line between the relay and the computer is intact, and if so, the computer is probably the issue.

would the oil pressure sensor cause a no start? I suppose I should be going through my wires making sure they are intact, The oil light may have nothing to do with the no start but no the less it is still on something is wrong with that system
Ford did not involve their oil level or pressure sensors in the fuel circuit at all. Even if they did, you couldn't have it interfere with the fuel pump priming because there is no oil pressure when the engine isn't cranking or running. You have said you aren't getting a priming. Oil pressure issues won't cause a no start on a Ford. Period.


Now, are you sure that the light isn't on because the engine isn't running and so there is no oil pressure?
 

rusty ol ranger

2.9L Mafia-Don
Supporting Member
Joined
Sep 22, 2007
Messages
7,347
Reaction score
2,251
Points
113
Location
Michigan
Vehicle Year
1987
Make / Model
Ford
Engine Type
2.9 V6
Engine Size
177 CID
Transmission
Manual
2WD / 4WD
2WD
My credo
A legend to the old man, a hero to the child...
No, I have already checked the inertia switch, but of course, I don't have any power to anything after the relay, I know the relay is good as well. like Ol Rusty ranger said the computer is what pops the relay off, I am not getting this at the relay. My ECU is not telling the pump to turn on.

I had this same issue on rusty #1 back years ago.

I ended up basically hotwireing the fuel pump off the key switch.

I do not reccomend you do this.

It wasnt untill recently when i harvested the ECM out of rusty #1 to put in rusty #2 to try and solve other issues.

I got the EXACT same issue with rusty #1s ecm when installed in rusty #2.

So i pulled codes (which i suggest you do).

I dont remember the number, or exact description of the code that came out, but it more less was an internal ECM fault on the fuel pump circuit.

But let me reittrate....

The oil level sensor IS NOT causeing the fuel pump not to run.
 


Top