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 Post subject: oil light issues...
PostPosted: Fri Mar 27, 2015 11:17 pm 
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Joined: Wed Mar 25, 2015 6:51 pm
Posts: 15
Location: Corvalis, OR
So my oil light comes on after the engine has warmed up. It's only at an idle that it comes on. Just put new oil and a filter into it this morning hoping to fix the problem. Any suggestions?


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 Post subject: Re: oil light issues...
PostPosted: Sat Mar 28, 2015 9:11 am 
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Joined: Tue Oct 07, 2008 8:07 pm
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Location: N W Arkansas
Buy & install a generic mechanical oil pressure gauge. You can temporarily plumb it in at the sender or extend the line & permanently install it in the cab, Mine's mounted on the column shroud next to the aftermarket tach. If you install it permanently I recommend using soft copper tubing rather than the plastic/nylon supplied. See what oil pressure you are running at speed & at idle, if the pressure is within specs your sending unit may be bad. If the pressure is low, especially with lots of miles or low compression or oil consumption the engine clearances have probably opened up due to wear so much that the oil pump can't maintain pressure & you're due for an engine rebuild. Or less likely it could be a bad oil pump.
On a side note: When asking questions about a problem please give vehicle information & when looking for parts add your location, sometimes it makes a difference.

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'78 Chevy LUV,1.9,4sp,headers,31's,SAS Dana 30,Dana 20,SOA rear w/Aussie Locker, rough body, bought new 12/4/78.
'87 Trooper,2.3,5sp,headers,31's,ball joint flip & spacer,Aussie Locker rear,Superwinch hubs,brush guard w/5.5K winch,more to come.


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 Post subject: Re: oil light issues...
PostPosted: Sat Mar 28, 2015 9:15 am 
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Joined: Wed Mar 25, 2015 6:51 pm
Posts: 15
Location: Corvalis, OR
oldestisuzuist wrote:
Buy & install a generic mechanical oil pressure gauge. You can temporarily plumb it in at the sender or extend the line & permanently install it in the cab, Mine's mounted on the column shroud next to the aftermarket tach. If you install it permanently I recommend using soft copper tubing rather than the plastic/nylon supplied. See what oil pressure you are running at speed & at idle, if the pressure is within specs your sending unit may be bad. If the pressure is low, especially with lots of miles or low compression or oil consumption the engine clearances have probably opened up due to wear so much that the oil pump can't maintain pressure & you're due for an engine rebuild. Or less likely it could be a bad oil pump.
On a side note: When asking questions about a problem please give vehicle information & when looking for parts add your location, sometimes it makes a difference.


OK. Thank you very much man. It's a 79 luv with the 1.8. And I'm in Corvallis Oregon.


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 Post subject: Re: oil light issues...
PostPosted: Sat Mar 28, 2015 2:57 pm 
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Joined: Wed Mar 25, 2015 6:51 pm
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Location: Corvalis, OR
Does anyone know the op. Pressures by chance?


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 Post subject: Re: oil light issues...
PostPosted: Sat Mar 28, 2015 6:08 pm 
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Location: Corvalis, OR
Well never mind folks. New thread is going to be started. Either a rebuild, or engine swap. Thanks guys!


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 Post subject: Re: oil light issues...
PostPosted: Sat Mar 28, 2015 6:56 pm 
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Location: N W Arkansas
56-71 psi @ 2800rpm, normal operating temps.
Looks like the oil light comes on a 4-7 psi.
Lack of oil pressure can also be caused by a sticking relief valve.

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'78 Chevy LUV,1.9,4sp,headers,31's,SAS Dana 30,Dana 20,SOA rear w/Aussie Locker, rough body, bought new 12/4/78.
'87 Trooper,2.3,5sp,headers,31's,ball joint flip & spacer,Aussie Locker rear,Superwinch hubs,brush guard w/5.5K winch,more to come.


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 Post subject: Re: oil light issues...
PostPosted: Tue Mar 31, 2015 9:32 pm 
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Joined: Wed Mar 25, 2015 6:51 pm
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Location: Corvalis, OR
oldestisuzuist wrote:
56-71 psi @ 2800rpm, normal operating temps.
Looks like the oil light comes on a 4-7 psi.
Lack of oil pressure can also be caused by a sticking relief valve.


Where's the relief valve located?


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