My oil psi gauge keeps bottoming out but runs fine so i was thinking sending unit and may as well change pump while down there and, i get this smelly white smoke out tail pipe when driving or so I'm told but no real problems besides when in cruise @about 70-80MPH my truck shakes only when goin up hill or when cruise is throttling to get me up a hill or something and then it stops it only shakes for a minute or so? any ideas
White smoke coming from the exhaust system is a sign of an oil system problem. If you did not have this issue and no other signs of an oil system problem, I would agree that the sending unit may be the only issue and needed to be changed. However, since you have been told that smoke is coming out of the exhaust and the car is acting up under load (going up a hill) it is time to take action and make sure your oil pump gets checked ASAP. Before you dive in you may want to check the oil on the dipstick to see if it looks/feels thin or watery. If that is the case, you may have other issues like water in the oil system from a bad head gasket - water looks like bubbles on the dipstick. If oil of the wrong type was used, the problem may be that the oil is too thin to work properly and needs to be replaced. If the oil looks fine and feels like its got the right consistency, the problem may just be with the oil pump. You didn't mention it but have you noticed the vehicle running hotter than normal? If so, this is another clue that the oil pump may be failing.
Whether the oil itself appears to have issues or not, you still need to have the pump checked. .
SOURCE: car is hard to start, keeps stalling, white smoke coming out of tail pipe
It sounds to me like you have a head gasket leaking. See if you can get a gauge and check each cylinder. Are you using alot of anti freeze?
SOURCE: 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.
Testimonial: "Thank you the answer was quick and to the point "
SOURCE: low oil pressure after engine warms up in 94 blazer with 4.3
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.
Testimonial: "But why has it started reading low, especialy after the new oil pump was put on. It read a constant 40 even when idling before."
SOURCE: 90 chevy k1500 350 tbi fuel problem starts but wont stay running
try bypassing the oil pressure switch on the back of the block behind the distributor, if there oil pressure switch goes bad it will do this. had one that drove me nuts trying to fix it then figured out I had to buy a book and low and behold thee it was 3 wire oil pressure switch you can't see between the engine and fire wall just behind the distributor and costs 8 bucks to buy new.
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