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| | | 88 GMC 305 Low Oil Pressure? | Joined: Jul 2005 Posts: 46 newbie | OP newbie Joined: Jul 2005 Posts: 46 | 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? | | | Re: 88 GMC 305 Low Oil Pressure? | Joined: Sep 2008 Posts: 1,229 old hand | old hand Joined: Sep 2008 Posts: 1,229 | 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.
| | | Re: 88 GMC 305 Low Oil Pressure? | Joined: Aug 2005 Posts: 21,211 Likes: 25 Supreme Master | Supreme Master Joined: Aug 2005 Posts: 21,211 Likes: 25 | 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 | | | Re: 88 GMC 305 Low Oil Pressure? | Joined: Oct 2001 Posts: 28,125 Madman! | Madman! Joined: Oct 2001 Posts: 28,125 | I'd bet on a bad sender or a bad wire. Yes with zero oil pressure the engine would not last very long. | | | Re: 88 GMC 305 Low Oil Pressure? | Joined: Feb 2008 Posts: 1,189 old hand | old hand Joined: Feb 2008 Posts: 1,189 | 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? | | | Re: 88 GMC 305 Low Oil Pressure? | Joined: Jul 2005 Posts: 46 newbie | OP newbie Joined: Jul 2005 Posts: 46 | I'll have to hook up a mechanical gauge. Van is parked until I find more time Thanks guys! | | |
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