Toyota Repair Problems? Ask a Mechanic for Answers ASAP
Thank you for allowing me to help you with this concern today and am sorry to hear that this is happening. I will have to ask you a few questions so that I can get a better understanding as to what may be going on with your 4Runner.
Are there any warning lights on or codes stored in the ECU?
Have you had any repair work performed recently?
Does the tapping noise speed up when the engine rpm's speed up?
I was looking up some repair info and tech service bulletins but there are no known issues with this concern. Will you be working on this 4Runner yourself?
Do you know of they check the valve clearance and noted if any adjustments were needed?
I am at a loss on this so I will open it up for all experts to see if they have any ideas. Please do not reply back or else the question will lock back to me. Thanks.