Is it normal to have 99psi at start up when its cold

[MPETT]

Hello,

I started the engine up on my mk1 tuscan 4.0 2003/4 today and noticed the oil pressure was reading 99psi. I let it run for a few minutes then turned it off. I turned the ignition on again and could see the pressure falling back down to 0psi. I then started her up again and the pressure went back up to 99psi and then 98psi a minute later. I turned her off and thought I'd check out the normal pressures being recorded by fellow PHers before I run her anymore.

I'm pretty sure this is normal with thick cold oil,and that pressure falls as the engine warms up, but 99psi felt a little high to me.

Your comments/experiences are welcome.

Cheers,

Martin

[-Jamie-]

sounds like ur oil pressure switch is messing about

[shep1001]

MPETT said:

Hello,

I started the engine up on my mk1 tuscan 4.0 2003/4 today and noticed the oil pressure was reading 99psi. I let it run for a few minutes then turned it off. I turned the ignition on again and could see the pressure falling back down to 0psi. I then started her up again and the pressure went back up to 99psi and then 98psi a minute later. I turned her off and thought I'd check out the normal pressures being recorded by fellow PHers before I run her anymore.

I'm pretty sure this is normal with thick cold oil,and that pressure falls as the engine warms up, but 99psi felt a little high to me.

Your comments/experiences are welcome.

Cheers,

Sounds knackered to me (the sensor that is) I get 65-70psi when cold & 20psi hot @1000rpm. at cruise speed on motorway 45-55psi

Shep

Martin

[shep1001]

shep1001 said:

MPETT said:

Hello,

I started the engine up on my mk1 tuscan 4.0 2003/4 today and noticed the oil pressure was reading 99psi. I let it run for a few minutes then turned it off. I turned the ignition on again and could see the pressure falling back down to 0psi. I then started her up again and the pressure went back up to 99psi and then 98psi a minute later. I turned her off and thought I'd check out the normal pressures being recorded by fellow PHers before I run her anymore.

I'm pretty sure this is normal with thick cold oil,and that pressure falls as the engine warms up, but 99psi felt a little high to me.

Your comments/experiences are welcome.

Cheers,

Sounds knackered to me (the sensor that is) I get 65-70psi when cold & 20psi hot @1000rpm. at cruise speed on motorway 60-65psi

Shep

Martin

[MPETT]

I've seen the part on clever trevor's site. Could this be the issue?? Is the oil pressure sensor not mounted on the engine?
http://www.clever-trevor.net/part/229/raceproved-o...

[BGB autosport]

Thats just the block it screws into, not the actual sensor.

I saw 99 psi on mine a few times about 6 months ago, it then stopped doing it and has never done it since, gauge works perfectly again.

[MPETT]

I haven't had the chance to take a look, but where about is the sensor?

[softtop]

MPETT said:

I haven't had the chance to take a look, but where about is the sensor?

down at the bottom of the engine, I am sure Graham Varley has a picture of it.

[MPETT]

I've found it. Its under the air filter/intake manifold. It only has one wire. the replacement one on TVR Power's web site has 2 wires. I was wondering if I create a jup lad from the sensor to the block to eath it, if that will solve the reading issue. I'll have a go tonight and report back!

Does anyone know the source of the problem? Corrosion/water ingress??

[B.N.D.]

Hi this link is very helpful.
http://www.pistonheads.com/gassing/topic.asp?h=0&a...

I put a new sender on over the weekend and started it up only to find fault codes and warning codes indicating there was no pressure. I measured the resistance across the terminals with the wires disconnected and engine off it was 9 ohms. With the engine cold at about 2000 rpm the reading went to 104 ohms.
Off the car the old unit showed 1600 ohms so I put it back on and the pressure reading was ok.
So it looks like there is a problem with the new sender. It was in a box with TVR No E6559 and had a No on the body 96367. Has anyone had similiar problems?

[MPETT]

B.N.D. said:

Hi this link is very helpful.
http://www.pistonheads.com/gassing/topic.asp?h=0&a...

I put a new sender on over the weekend and started it up only to find fault codes and warning codes indicating there was no pressure. I measured the resistance across the terminals with the wires disconnected and engine off it was 9 ohms. With the engine cold at about 2000 rpm the reading went to 104 ohms.
Off the car the old unit showed 1600 ohms so I put it back on and the pressure reading was ok.
So it looks like there is a problem with the new sender. It was in a box with TVR No E6559 and had a No on the body 96367. Has anyone had similiar problems?

Hi BND,
Have you taken measurements of a sensor working properly? If so what was the resistance at cold and hot?
Cheers,
Martin

[B.N.D.]

I have not taken any measurements with the old unit back on but I will so I can compare with a new unit.

[BGB autosport]

If someone measures the resistance on the car of the pressure sensor, could i be cheeky and ask if you could check the resistance of the oil temp sensor with a cold and hot engine and report back with the values and display reading for each?