Discussion
Hi all,not been out in the car very much due to all this water about the place! Yesterday thought id start it up to give the battery a charge! First thing i noticed was that the rev counter read about 200 rpm when clearly was about 900rpm! then it shot up to normal after 30 seconds or so! then i noticed the temp gauge wich has always over read by 10 deg was jumping about! then the scarey one was the oil pressure gauge!
that was over reading by 10-15 psi at cold start up about 85psi!
normally 70psi ish! engine runs and sounds fine! anyone had this? or any ideas whats causing this? Checked oil level too and all seems fine!
Lee
that was over reading by 10-15 psi at cold start up about 85psi!normally 70psi ish! engine runs and sounds fine! anyone had this? or any ideas whats causing this? Checked oil level too and all seems fine!Lee
I had this recently but think it was just general water ingress around plugs/coilpacks - big fuse was fairly new and looked fine and dandy when I had a poke about - a good blast to heat things up and all gauges returned to normal, although I do still have a bit of a misfire 
- Am surprised your oil gauge would be affected though as this is mechanical I think rather than electrical.
- Am surprised your oil gauge would be affected though as this is mechanical I think rather than electrical. ridds said:
I thought the oil and water pressure guages were capillary.
No electical part too them at all, aprat from teh back light.
Only electrical oil part is the red light on the dash and that is a switch.
No electical part too them at all, aprat from teh back light.
Only electrical oil part is the red light on the dash and that is a switch.
Changed mine recently and both definately capillary and no electrical connection except the illumination bulb...ridds said:
I thought the oil and water pressure guages were capillary.
No electical part too them at all, aprat from teh back light.
Only electrical oil part is the red light on the dash and that is a switch.
I had a gauge rebuilt by CAI as oil temp and oil pressure. Only one capillary was attached that I remember.No electical part too them at all, aprat from teh back light.
Only electrical oil part is the red light on the dash and that is a switch.
Steve.
Steve_T said:
ridds said:
I thought the oil and water pressure guages were capillary.
No electical part too them at all, apart from the back light.
Only electrical oil part is the red light on the dash and that is a switch.
I had a gauge rebuilt by CAI as oil temp and oil pressure. Only one capillary was attached that I remember.No electical part too them at all, apart from the back light.
Only electrical oil part is the red light on the dash and that is a switch.
Steve.
I managed to get fernies to do it for me once - probably back in 2001. I got the AA man to give my battery a charge and drove the 3 miles from where I broke down. Managed to get them to stay open late, they fixed it for beer tokens. Since then I have done it myself. Pretty easy.
Do a search
Do a search
I think the water temperature circuit is actually a thermocouple. When you apply heat across the junction of dissimilar metals (straight wire v currly wire) you generate a small electric current which drives the dial.
Also I think the oil dial is mechanical, actually fed by the oil itself.
I just can't see why both would be fluctuating.
I suppose electrical fluctuations across the entire vehicle, such as an intermittent earth fault, could disturb the thermocouple which is is in contact with the water but only generates very small voltages.
Likewise, a general electrical fault could cause the engine to surge forcing the oil pressure high.
I'm changing my gauge this weekend and will confirm its function.
Also I think the oil dial is mechanical, actually fed by the oil itself.
I just can't see why both would be fluctuating.
I suppose electrical fluctuations across the entire vehicle, such as an intermittent earth fault, could disturb the thermocouple which is is in contact with the water but only generates very small voltages.
Likewise, a general electrical fault could cause the engine to surge forcing the oil pressure high.
I'm changing my gauge this weekend and will confirm its function.
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