My 97 yukon has rough idle while in park, the engine makes loud knocking while in idle or at high rpm's, and sometimes my oil pressure drops to zero psi but i checked the oil and the oil level is normal.
Checking oil level won't tell you anything
You need to put a mechanical gauge on
the motor,you can't go by the dash for accuracy
You could have many things that need to be
done preventative maintenance wise before
you even start to diagnose the couple of current
issues
Dash Check Lights?
Codes?
Driven for two years & never worked on?
We can't guess,you need a repair shop to
give you the solution
SOURCE: 1997 Eagle Talon TSI AWD oil pressure goes from zero to normal and back
Te 1st thing to do is replace the oil pressure guage sending unit, most times that is the problem, if press remains low use a mechanical test guage to verify what the oil pressure is, hook this tester up at the port the sending unit is screwed into.
SOURCE: oil pressure drops at idle
oil pump is going bad or there is problem with oil pressure witch have it check out because if oil pressure is low it can cause serious engine damage. Have it check out soon hope this help
SOURCE: 97 wrangler oil pressure drops when engine is at idle
check the engine oil level... you could possibly need to replace the oil pump soon... if you do not live in a cold climate i would consider using 30 or 50 weight oil. do NOT use that in a cold climate as the oil is like molasses when it gets cold.
that's only temporary. one other thing to consider is a clogged oil filter... when was the last time it was changed ?
Robert
SOURCE: 2002 gmc yukon, rich fuel code, low fuel pressure @40
you may have two oxugen sensors on your yukon. if so the oxygen sensor that controls that bank may be bad. from what you mentioned in your complaint, it sounds like it is the oxygen sensor.
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