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08-17-2013, 03:11 PM
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CC Member
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Join Date: Sep 2010
Location: redcliffe,
qld
Cobra Make, Engine: venom motorsports /ls1 auto
Posts: 500
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Not Ranked
oil pressure gauge test
just wondering if some one has a quick test for oil pressure senders
ive tested the wiring to the gauge,, checked power at the gauge ok
problem is I have oil pressure at the pump on the motor but not at the gauge
im only turning it over by key at this time !!ready for first fire up
so how do I check the sender
all ideas a great help
thanks again
rob
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not all your babies are your children
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08-17-2013, 05:47 PM
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CC Member
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Join Date: May 2002
Location: Brisbane Australia,
QLD
Cobra Make, Engine: RMC under re-construction, GenIV with tremec 600, Jag 3.31 L/S diff
Posts: 3,318
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Not Ranked
Rob, Tap a hose fitting into one of the oil gallery plugs on the side of the motor (or anywhere else in your oil system).
Then use a garden weed sprayer filled with a couple of litres of oil to pressurize the oil system.
Serves as a good way to pre-oil an engine that's been sitting for a while and allows you as much time as you need to check out things like gauges etc.
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It's impossible to soar like an eagle when you're surrounded by turkeys.
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08-18-2013, 12:47 AM
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CC Member
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Join Date: May 2008
Location: Brisbane,
QLD
Cobra Make, Engine:
Posts: 2,773
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Not Ranked
Hi Rob,
Can you give some more info.
LS1 using what ECM?
What gauges? How is the gauge sender wire routed, discreet one wire direct to the sender or via the ECM?
__________________
Gary
Gold Certified Holden Technician
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08-18-2013, 01:43 AM
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CC Member
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Join Date: Sep 2010
Location: redcliffe,
qld
Cobra Make, Engine: venom motorsports /ls1 auto
Posts: 500
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Not Ranked
im running a standard ecm off the donor car & been done to suit stand alone
gauges have only 1 wire to the sender
all gauges are vdo with matching senders that are vdo as well
I,m wondering if it could be the thread seal insulating it from earth
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not all your babies are your children
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08-18-2013, 02:35 AM
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CC Member
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Join Date: May 2008
Location: Brisbane,
QLD
Cobra Make, Engine:
Posts: 2,773
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Not Ranked
With your VDO oil gauge, does gauge go full scale if the sender wire is disconnected while the ignition is on?
If so, 0 ohms if be zero oil pressure and about 250 ohms would be full scale.
If you have any doubt on the electric gauge, I would fit a mechanical workshop gauge prior to fire up.
I fitted another oil pump on a VE last Thursday after it developed no oil pressure at another shop while having a service (oil and filter change).
Pressure relief valve stuck open in the pump.
__________________
Gary
Gold Certified Holden Technician
Last edited by Gaz64; 08-18-2013 at 01:55 PM..
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08-18-2013, 06:00 AM
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Senior Club Cobra Member
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Join Date: Mar 2007
Location: North Gold Coast,
Qld
Cobra Make, Engine:
Posts: 820
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hahahahaha
don't u know ls1s run fk all oil pressure
go buy a holden workshop manual and they recommend 7 to 15 psi oil pressure at idle which is funny
anyway to test the gauge turn on ign then just earth out the wire at the sender if its an aftermarket gauge
get someone to look at yr gauge and it will go to high then quickly remove the wire from earth as if u leave it on too long u can burn gauge out
sometimes just cranking an engine may take afew minutes to get pressure
make sure battery is cranking super fast so maybe jump start it and remove spark plugs too as it helps
or like ive done in the past after trying for an hour or so just start the bloody thing
if it doesn't get oil pressure in 5 seconds turn it off
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08-18-2013, 06:16 AM
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Senior Club Cobra Member
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Join Date: Dec 2001
Location: Shasta Lake,
CA
Cobra Make, Engine:
Posts: 26,552
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Not Ranked
Rob,
I am not all that familiar with your engine setup but I used VDO guages in my Cobra when I was racing and if your sending unit screws into a port and you used teflon tape or any type of insulation, that will stop the unit from working. All the above answers are good and should give you a good starting point. We found the tape issue when 3 of the other people's Cobras suddenly had no oil pressure and they had changed the sending units. I never used anything on mine so I never had a problem, and once the tape was removed, theirs worked ok.
Ron
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08-18-2013, 10:09 PM
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CC Member
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Join Date: Feb 2002
Location: Alice Springs, central Australia,
NT
Cobra Make, Engine: Classic revival kit (CR3181), gen III engine, T56 6 speed box, AU XR8 lsd diff
Posts: 5,699
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Not Ranked
Gauge wont show pressure at cranking speed.
Fire it up and watch the needle move after a second or 2.
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08-19-2013, 01:22 AM
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CC Member
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Join Date: Jul 2010
Location: Perth,
WA
Cobra Make, Engine: FFR Mk4 Roadster, LS3, TR6060, 8 3/4"
Posts: 432
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Not Ranked
Hi Rob,
I was in the same boat very recently, gauge testing showed a deflection on the gauge as per above, but nothing would show up during cranking.
So f#%k it I said, let's hit the key and go for a start, and see what happens. And carefully watching during the start, I saw instant pressure within say 3 seconds. Very relieved to say the least as I was just about to shut it off.
I know it was not officially primed, but the motor had been run before (ex-crate engine), and it turned over real nice and easy, so I took the leap of faith being prepared to stop quickly if no pressure showed up.
It turned out ok.
__________________
Tim
FFR Mk4 Roadster
HSV Clubsport R8
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08-19-2013, 02:02 AM
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CC Member
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Join Date: Sep 2010
Location: redcliffe,
qld
Cobra Make, Engine: venom motorsports /ls1 auto
Posts: 500
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Not Ranked
JIM i.ll try the earth out first as I did try it first time without plugs & anew odessy battery
RON 64 yep ill remove all thread seal as well
BOXHEAD dave I have not fired it yet as I have on exhaust yet & I thought it needed o2 sensors to run
this is my first computered motor!!! so more stupid questions coming
thanks for all the ideas
ROB
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not all your babies are your children
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08-19-2013, 04:56 AM
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Senior Club Cobra Member
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Join Date: Mar 2007
Location: North Gold Coast,
Qld
Cobra Make, Engine:
Posts: 820
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It's hard to decide which way to go
Start and hope for pressure
Or keep cranking
As a mechanic we could not waste hours trying to get oil pressure so after half an hour wasted most of the times we would have to start engine
And over the past decade wiring engines maybe two or three out of couple hundred have not had oil pressure
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