Question about GPS
If knoking starts before oil pressure dropping, then your problem is caused by a bad rod bearing. If it is the rod bearings, knocks will come from the bearing inside the engine, rather that from the valves. In that case it may be a good idea looking for a second hand replacement engine rather than repairing the engine.
If the knocking comes up only after the oil pressure goes down, then it is still an oil pump problem. Check all oil lines.Have a look at the PCV valve, that can cause oil pressure to drop. Check the oil lines and test the oil pump with a hand pressure gauge between the oil lines, it must have from about 40 psi idle to 60 psi.
Posted on Jul 20, 2009
1. check compression all cylindars
2. Make sure the pump is actually working if the guages says you have low oil pressure then the pump is not working adequately.
Knocking on the top of engine is not a good sign at all it sounds like the pump is giving out at one point but working when you first start the car.
I would check this pump again.
Posted on Jul 19, 2009
HI, i need to know some additional information. How often do you change your oil?
What type of vehicle is this? a car or truck?
What type of engine are you running? V8 or V6 or V4??
Whats the liter on this engine?
How many miles are on this vehicle at this time?
Whats the year model of this vehicle?
Did you just switch to 5w 20 or, have you ran thsi grade for the life of the vehicle?
Posted on Jul 19, 2009
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Posted on Jan 02, 2017
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