How can you say a new oil has a tick on initial start-up after oil change when it's in the pan & hopefully filter?
Am I missing something here?
Or are you priming before starting?
Maybe same oil prior to last change.
Electrical fan suppose to come on with the AC on no matter what the temp is.
If its running with the AC on its most likely the mechanical fan clutch.
When you are cruising the air flow from your speed will keep radiator cool.
If you are idling or moving slow in stop & go traffic you will heat up...
Tuning for 87 octane would be to get rid of ping if you have detonation......will be no performance increase at all.
HP & torque tune increase would be advance timing with added fuel/air from the higher octane fuels. More octane=more timing=more power
If its the exhaust you should be able to simulate noise/vibration with the throttle while in park.
If it only makes noise/vibration while moving its mechanical.
Nope, not backwards
More pressure when MDS solenoids are open on deactivates lifters
https://help.summitracing.com/knowledgebase/article/SR-05428/en-us#:~:text=The%20computer%20shuts%20off%20fuel,This%20%E2%80%9Cdeactivates%E2%80%9D%20the%20lifter.
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