Discussion
Just noticed on the last couple of miles of an afternoon blast that the oil pressure gauge was reading 90 psi!!!! The needle was as far to the right as it could go under load and on tick over. The car was performing fine and there was no smoke from exhausts or under the bonnet.
I turned the engine off for a few minutes and then fired it back up, the needle raced back up to 90+ then dropped to 0 then back up to 90+ again and stayed there, all on tick over. Complete gimp when it comes to mechanicals and the search forum still semms to be down - Any ideas???
I turned the engine off for a few minutes and then fired it back up, the needle raced back up to 90+ then dropped to 0 then back up to 90+ again and stayed there, all on tick over. Complete gimp when it comes to mechanicals and the search forum still semms to be down - Any ideas???
Electrical problem. Happy reading: www.pistonheads.com/gassing/topic.asp?t=160454&f=12&h=0
Sounds like oil pressure switch is guffed!
Mine did this was..it first read 0psi then later went up to 90psi then would drop to 60psi. Just make sure the oil presure light on the dash is not illuminated..if so stop the car do not drive or start up. It's not a big job to replace the oil gauge pressure switch, could be that the wire has just come off or corroded.
Dave
Mine did this was..it first read 0psi then later went up to 90psi then would drop to 60psi. Just make sure the oil presure light on the dash is not illuminated..if so stop the car do not drive or start up. It's not a big job to replace the oil gauge pressure switch, could be that the wire has just come off or corroded.
Dave
Oil pressure switch is for warning light, oil pressure sender is for the gauge, both are located off the oil pump on front bottom drivers side of engine. Switch is short with a single connector, sender is like a small barrel with a connector on the end - both screw into the engine. Switch has a brown/yellow cable, sender has a green/brown cable on my car (think these colours are coorect & fairly standard).
Dave
Dave
I'll go along with Dave, I had bouncy needle syndrome in mine, and that was the sender, not hard to change, the hard part is getting the right one, 
you have to match the sender to your gauges, the sender will have a load of numbers on the side of it this MUST be the same on the new one or the reading will be out, it's basically the pressure rating of the spring in the unit. 
A search on here for Oil Pressure Sender will dig up more information
you have to match the sender to your gauges, the sender will have a load of numbers on the side of it this MUST be the same on the new one or the reading will be out, it's basically the pressure rating of the spring in the unit. A search on here for Oil Pressure Sender will dig up more information
PJC said:
If I take the sender out in order to get all the correct numbers from it will oil start draining out?
Should only trickle out if at all, jack the drivers side up, pop the wheel off and it shouldn't be to tricky,I'd have a bowl out just in case though
a little bit of thread sealent/plumbers tape is a good idea on the threads when you put the new one back in I managed to get a new sender unit delivered from Speedy Cables for £37 plus VAT.
It has all the same numbers as the original and looks identical. I took the old one off last night but noticed immediately that the threaded bit that screws into the engine is a lot bigger (wider) than the new one that has been supplied so I put the original straight back in. The original looks to be about 15-16mm whereas the new one is about 9-10mm.
Is there a thread adaptor on the original that I didn't notice because of the oil that I need to transfer on to the new one?
I checked with a TVR dealer who had one on the shelf with the same numbers and he confirmed that the thread on that was 9-10mm as well but was unsure as to whether there is an adaptor or if there is a completely separate sender with the same code but a larger thread. Speedy Cables are also checking for me.
Any ideas?
Paul
It has all the same numbers as the original and looks identical. I took the old one off last night but noticed immediately that the threaded bit that screws into the engine is a lot bigger (wider) than the new one that has been supplied so I put the original straight back in. The original looks to be about 15-16mm whereas the new one is about 9-10mm.
Is there a thread adaptor on the original that I didn't notice because of the oil that I need to transfer on to the new one?
I checked with a TVR dealer who had one on the shelf with the same numbers and he confirmed that the thread on that was 9-10mm as well but was unsure as to whether there is an adaptor or if there is a completely separate sender with the same code but a larger thread. Speedy Cables are also checking for me.
Any ideas?
Paul
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