Low oil pressure came on yesterday. knocking noise. Sometimes it goes off. on 2006 Ford Expedition

The camshaft sensor, crankshaft sensor and 4 coil-packs were replaced on Saturday. Truck was running smooth for about 2 miles. Check engine light came on and the low oil pressure warning came on. Put some oil in(about 2 quarts) and it went off, then it started again about a mile later.

by in Sugar Land, TX on October 14, 2013
2 answers 5 comments
ANSWER by on October 14, 2013
What kind or brand of oil are you using. Were you low when adding 2qts?
COMMENT by on October 14, 2013
I used motor-craft synthetic blend. I only added 2 qts because I had more at home and it was reading low pressure. It was a little low I guess. I haven't added more yet because someone mentioned that it may be the oil pump. But it may also be something with the switching out of the sensors on the camshaft and crank-shift.
COMMENT by on October 14, 2013
Don't overfill your oil. Check the connection to the oil sending unit. If it's not knocking when low pressure indicated, I would replace the oil sending unit. Many times they go bad, and your oil pressure is fine. ALWAYS CHECK OIL LEVEL BEFORE ADDING.
COMMENT by on October 14, 2013
Thanks, did check oil and oil level is fine, however the oil pressure gauge is on low.
COMMENT by on October 14, 2013
Check connection and/or replace the sender, it's usually behind the oil filter. Make sure it's not leaking as well since you were also low on oil.
COMMENT by on October 14, 2013
Thanks,
ANSWER by on October 14, 2013
Have the oil pressure checked with a manual test gauge!
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