Question about 1991 Chevrolet S-10 Blazer

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I changed the oil sending unit on my 1991 chevy S-10 Blazer do to faulty readings. After I let the truck idle for about 20 mins the idle sits at about 15 or 20. When Idling at a stop it some times sits at a 10 0r 5? What should I look to do next?

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  • Samuel Charles Spriggs May 11, 2010

    First, when were the oil & filter last changed? How many miles on the engine? Any knokcing noises from engine?----------------- Charlie

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Change the idle sensor.

Posted on Sep 09, 2009

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I have two sending units on the housing for the oil filter and the top sending unit started leaking real bad. This is on my 1987 S-10 Blazer 4X4 with a 2.8 V-6


Well, first off would be to replace the faulty sending unit so that the oil pressure will stabilize. Second, if I'm reading this correctly that you have no oil in the oil filter at all? If not, your oil pump could be quitting or it did quit. It's recommended not to start the truck until it can be checked for oil pump operation. Have the valves been chattering badly? The only 3 things that would prevent oil from getting to the oil filter are a blocked passage, a failed oil pump or no oil in the motor at all. When the oil guage has that fluctuation is when the pump is going out or again the engine has no oil or a leak so massive that the guage can't hold a stable reading. Good luck

May 11, 2017 | 1987 Chevrolet Blazer

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2.8l v6 in a s10 blazer. no head gasket problems thus far. wondering why my oil pressure gauge fluxuates? minor rpm change while oil pres guage does its thing why?


Oil pressure always changes with rpm.
At idle you should have around 10 psi, and it should max out at high rpm around 50 psi or so.
You not only can't have as much pressure at idle, but you don't need it either.

Jun 06, 2011 | 1989 Chevrolet S-10 Blazer

1 Answer

I have an 198 k5 blazer wth a 350 small block . it shows no oil pressure at idle but when i drive it or rev it up the oil pressure goes to 35-40 lbs of pressure . the engine sounds great no knocking or...


Sounds to me like your oil pump is bad, not pumping sufficient oil at low RPM's. If the gauge shows pressure when driving or revved, the sending unit is working

Apr 02, 2010 | 1991 Chevrolet S-10 Blazer

1 Answer

What are the timing specs for a 1991 chevy s10 blazer 4x4 4.3? changed timing chain and gears and timing is off. got marks together but still won't crank.


the timing spec is 0degrees at idle, also heres adiagram for timing chain, check oil preasure switch connection and wiring to control module.hope this helps.ed9c50e.gif

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I have a 99 blazer and ever since I have owned it, it reads lower in pressure when idling, but will go up too 40 while driving. This is normal for the vehicle. If the pressure gets real low, and stays low, it means its time for an oil change.

As long as the pressure goes up when you give it gas, it is fine.

Jan 09, 2010 | Chevrolet Blazer Cars & Trucks

1 Answer

1991 chevy S10 blazer fluctuating oil pressure


I assume from the year it has high mileage. With mileage comes wear in these engine's bearings allowing oil pressure to drop because of the excess clearance between cam and bearings, also the crank and bearings. When the engine is hot and idling the oil is thinner and goes by the bearings quicker. If you have good oil pressure while driving, I'd leave it alone, maybe use a thicker oil or some lucas additive. My 89 does the same thing sometimes in the summer, but don't remember it doing it this summer. I use Mobil-1 and an AC Delco filter.

Oct 17, 2009 | 1991 Chevrolet S-10 Blazer

1 Answer

Guage reading high


It is not hard to change the sending unit. I reccomend that you remove the sending unit and hook up a test gauge, then you will know if your pressure is actually too high, or not.

Sep 20, 2009 | 1991 Chevrolet S-10 Blazer

1 Answer

Oil Pressure Problem?


just fixed that problem myself. it was an oil pressure sending unit. twelve dollar part. and i was thinking oil pump or something... 12 dollar part. oil pressure sending unit.

Sep 18, 2008 | 1989 Chevrolet S-10 Blazer

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