78 FJ40 Oil Pressure reading maxed out

[Landlover12]

Installed a new oil pressure sensor about a year ago.

Car sat for a few months.. just started driving it again.

Would a bad filter give a high or low reading? Curious if I should replace the filter to troubleshoot this.

 

[charliemeyer007]

I doubt its the filter, but they are cheap to change. My guess is the sensor then the meter.

 

[Bluegrass40]

Possible but pretty unlikely. There is a spring loaded bypass in the oil filter housing (or whatever you call it) that should open if the restriction is too high in the filter.

 

[brian]

put a mech gauge on to verify actual pressure

 

[Bluegrass40]

if it were a bad filter (and a stuck bypass) it would read high pressure at the sender. Again, I think it’s unlikely that it’s the filter, but have been wrong before

You could also pull the valve cover off and run the engine and make sure the top end is being oiled.

 

[charliemeyer007]

Almost the first thing I did when I got my 72 in 82 was to install a direct read oil pressure gauge. I used fuel hose to contain the plastic oil line from the gauge to the engine side of the fire wall - that way no face full of hot oil in case the line snapped off. Its still there and still working fine.

 

[Pighead]

Almost the first thing I did when I got my 72 in 82 was to install a direct read oil pressure gauge.

This. I would be very nervous if I drove a vehicle without a real, mechanical, oil pressure gauge. Stock gauges are notoriously slow and inaccurate.

 

[Landlover12]

Just ordered a new one…


mine as shown in the photo only has one wire. What should I do with the second terminal? Should I run a ground wire to it?

Oil Pressure Sending Switch - FJ40, FJ45, FJ55, FJ60, FJ62, FJ80, BJ 1958-1997

land cruiser fj40 low oil pressure switch

cruisercorps.com

 

[Landlover12]

Photo

 

[Landlover12]

What’s the oil you recommend for a gas 2f fj40

 

[Paul_A]

If I recall correctly a bad ground usually pegs the meter.

 

[Landlover12]

If I recall correctly a bad ground usually pegs the meter.

I’ll test that ground! Thanks

 

[charliemeyer007]

If I was to add that wire I would run from the sender to the instrument panel. However I run a thick cable from battery -neg terminal to a starter mounting bolt, also a woven strap cable to the engine and like #10 to the alternator.
I think this is my gauge. I made a bracket that clamps to the steering wheel housing. I like the lighted at night feature.

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[charliemeyer007]

I run the diesel 15-40 T4 Rotella and I have a block heater for winter

 

[locklaw]

Just ordered a new one…


mine as shown in the photo only has one wire. What should I do with the second terminal? Should I run a ground wire to it?

Oil Pressure Sending Switch - FJ40, FJ45, FJ55, FJ60, FJ62, FJ80, BJ 1958-1997

land cruiser fj40 low oil pressure switch

cruisercorps.com

Yep, it's for a dedicated ground added later by Toyota to overcome the grounding issues that are possible with the original design.

 

[ToyotaMatt]

Installed a new oil pressure sensor about a year ago.

Car sat for a few months.. just started driving it again.

Would a bad filter give a high or low reading? Curious if I should replace the filter to troubleshoot this.

your yellow wire w/ black tracer stripe found a ground path , hence full fielding the cluster Gauge element into certain charred doom

- i have both the single wire and double ire versions , i hand assemble each one using all OEM Japan Spec parts ....


- 16 gauge wire , and a nice tidy gloss loom at the end , i also include a 3M Crimp heat shrink butt adhesive lined to tie it all together for a life time of service :


i have also reproduced the 8/80/1990 rubber sender insulator and vibration and temperature stabilizer cover EPDM chemical resistant

Engine Wire No 4 kit us Tite and Right for all years 1961-1990

OEM Oil Pressure Sending Unit Sensor Rubber Boot / Cover Cap & Sub Harness Engine Room Wire #4 Part # 82124-90A01 Restoration & Repair Kit BJ70 HJ60 BJ60 FJ60 FJ62 BJ42 Fj40 FJ55 - VintageTEqParts.com

OEM Oil Pressure Sending Unit Sensor Rubber Boot & Sub Harness - Part # 82124-90A01- Engine Room Wire #4 Restoration...

vintageteqparts.com

( Single Wire Type ) TOYOTA Oil Pressure Sending Unit Sensor Switch Connector Wire Harness Repair Kit - VintageTEqParts.com

TOYOTA Oil Pressure Sending Unit Sensor Switch Connector Wire Harness Repair Kit Fits 1964-1990 FJ40, 55 , 60, 62...

vintageteqparts.com

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[ToyotaMatt]

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[Landlover12]

replaced the oil sensor and we are in buisness!! Thanks for the help everyone!!