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#319113 - August 16th 2009 8:16 pm 88 GMC 305 Low Oil Pressure?
Jesse Offline
newbie

Registered: July 26th 2005 12:00 pm
Posts: 46
Loc: VANcouver, BC
When the engine is cold, oil pressure shows about 1/8th of the gauge (gauge reads 0-400), but when it warms up, the gauge reads zero, even when I rev the motor.

Shouldn't zero oil pressure lead to catastrophic engine failure? It's been like that for 70,000kms.... Bad sender maybe?

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#319179 - August 16th 2009 10:30 pm Re: 88 GMC 305 Low Oil Pressure? [Re: Jesse]
SixShot Offline
old hand

Registered: September 27th 2008 12:49 pm
Posts: 1229
Loc: Joyce Washington
Get your self a mech oil pressure guage,hook it up where stock sending unit is threaded in and see what you've really got.What brand/weight oil and brand of filter are you using? Beings as it's been like this for so long I'm thinking it's more than likely the sending unit or guage.If it hasn't started knocking,ratteling,howeling by now it's probably ok internaly.Good luck
_________________________
79 B300 4x4,80 B100,83 B150.If it's not a van I just don't understand it.

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#319259 - August 17th 2009 7:28 am Re: 88 GMC 305 Low Oil Pressure? [Re: SixShot]
NateNCBV Offline

Administrator

Registered: August 23rd 2005 12:00 pm
Posts: 20415
Loc: Brooklyn Park, Maryland, USA
I would venture to say if the oil pressure really was zero PSI, it would be knocking like crazy. Do you hear any noises?
_________________________
Nate Breece (Nate the skate)
2%
North Chesapeake Bay Vans
A-100 Van Association
Honorary Canadian(You Hoser!)
--------------
1994 Dodge B250 Elk Conversion (5.2L/A518)
1985 Dodge B150 "Burnin' Desire" (5.2L/A727)

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#319274 - August 17th 2009 8:54 am Re: 88 GMC 305 Low Oil Pressure? [Re: NateNCBV]
Superbeast Offline

Madman!


Registered: October 25th 2001 12:00 pm
Posts: 28121
Loc: Dayton, New Jersey, U.S.A.
I'd bet on a bad sender or a bad wire. Yes with zero oil pressure the engine would not last very long.
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#319484 - August 17th 2009 5:57 pm Re: 88 GMC 305 Low Oil Pressure? [Re: Superbeast]
swimmster Offline
old hand

Registered: February 16th 2008 9:41 am
Posts: 1189
Loc: New York
had a 73 pontiac once that i drove 400 miles on 5 psi of oil pressure. lol.. stupid red lights.. although, anything off idle would shut the light off, so.. never saw the light unless i was at a red light.. when i finally pulled it apart to put in a new pump, the bearings were still in excellent shape.. i kept them for years to show people.. put new ones in anyways.
_________________________
Yeah..... I know I know.... It's NOT a van... But if you squint, It could be a REALLY long van?


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#319544 - August 17th 2009 8:37 pm Re: 88 GMC 305 Low Oil Pressure? [Re: swimmster]
Jesse Offline
newbie

Registered: July 26th 2005 12:00 pm
Posts: 46
Loc: VANcouver, BC
I'll have to hook up a mechanical gauge. Van is parked until I find more time frown

Thanks guys!

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