I have a 03 Suburban 5.3 L and just noticed the oil pressure is running high about 85. What could cause this and is it something I can fix ?

 

might be the sending unit ?

 

it might be slug in the system. how many miles do you have? some were oil is building up in a passage or line check that first.

 

85,000 How do I check for sludge ?

 

Drain the oil,or check on cap.If it is too dirty use motor flush to clean the entire system.should the problem persist,remove oil pressure switch connect oil pressure gauge (special tool) to see the diffrence between cluster gauge and connected guage.

 

When the key's off should the gauge return to zero ? Mine drops to 40. Also having a hard time finding the sending unit , any tips ?

 

??

 

I started this morning ( 1st real cold morning this year ) and it went up to about 140 and I thought it was because it was cold. Turned it off and now it only resets to 80 when keys off. Bad gauge ??

 

Your cluster is probably bad. Usually speedo dies first though. GM extended warrranty on them due to high failure rates.

 

I just got off the phone with my dealer and then GM. Yes there is a problem with the cluster and GM is covering them up to 7 years 70,000 miles. What a bunch of crap. They admit there is a problem but said I was over the miles. Who in the hell drives 10,000 miles a year ? Not me and I'm sure not a lot of other people either, I'm guessing that is how they came up with that magic number to cover their a$$. No wonder GM is in trouble, my next SUV will be a Toyota !! I don't have the money right now to replace it, so dose anyone know if the oil pressure also has a light / buzzer that goes off if the pressure get's too low. I know vehicle's with out gauges just have lights / chimes. I'm going to just keep running it until I can maybe put a after marker one on/under the dash.
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