| oil sending unit I have a 90' S-10 Blazer, 2WD, 4.3 V6. The oil pressure gage has started acting up and showing anywhere from 0 to 35 lbs of pressure. ( my oil pressure has always been excellent in the past running 60-80). When I first start up the pressure is about 30-35 and drops to 0 after a few minutes. At first I though I really had a pressure problem and took it in for a oil change. They changed the oil and said everything looks ok. The red light associated with the analog oil pressure gage doesn't come on when the gage drops to 0 but a yellow 'check gages' light does. The engine sounds great so I really don't think it's a real oil pressure problem.
Someone said it could be the 'oil sending unit'. Not sure what that is or where it is located. Anyone have any ideas as to what might be causing this problem and if it is the OSU is that an expensive thing to replace.
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| »www.autozone.com/servlet/UiBroke···aeae.jsp
That's the repair guide stating how to replace it. Looks to be about a $10-$20 part. |
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cabot
join:2002-07-11
Apo, AE | reply to pitroad01
On my 92, it is the rear of the motor, drivers side, down by where the fuel line bracket is located. |
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 mattmagPremium,ExMod 2000-03
join:2000-04-09
NW Illinois
kudos:3 | reply to pitroad01
I would suggest having a shop check the *actual* oil pressure with an external gauge before you begin changing parts with no diagnosis. It is quite likely a sending unit failure, but you can not rule out the potential for an internal problem causing the pressure loss.
If you wait until the engine sounds not-so-great, it's far past too late... |
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 Boomer86never say roadkillPremium
join:2002-10-18
Walden, NY | reply to pitroad01
How's it look under the fill cap? Any sludge?
If your motor's clean and the maintenance is up to date, my money's on the sending unit or gauge. The former is the easiest to swap out, and is more prone to failure.
When an oil pump goes, usually it just dies 100%.
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Don't pay ME back, pay it forward. |
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mattmagPremium,ExMod 2000-03
join:2000-04-09
NW Illinois
kudos:3 | said by Boomer86:If your motor's clean and the maintenance is up to date, my money's on the sending unit or gauge. On an 18 year-old 4.3L S10, it wouldn't matter if you can eat off the inside of the engine. Things can still fail. Being "clean" is not an absolute against things going bad. We get nice clean broken cars in the shop every day.  |
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| reply to mattmag
said by mattmag:I would suggest having a shop check the *actual* oil pressure with an external gauge before you begin changing parts with no diagnosis. Agreed, any gauge these days is electric and subject to many problems. Install a mechanical gauge to determine if there is a real problem, and then proceed from there. |
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| reply to pitroad01
Well it turned out to be the oil sending unit. I was going to have a mech gage put on it to be positive but the cost of doing that was about the same as replacing the sending unit. So I opted to just replace the unit and that would answer the question. As it turned out that did resolve the issue. A side note, on my S-10 blazer there was an extension adapter to route the sending unit away from the distributor (a 45 degree angle). That broke off when they tried to remove the sending unit. Another 15 bucks but I'm just thankful it was the most simple thing causing my problem. |
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| reply to mattmag
LMAO.. |
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| reply to pitroad01
Good thing thats the only problem. |
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