Just noticed this on the way home from the local mckay d’s last night. I hear a metallic tapping sound coming somewhere either behind the motor(against the firewall) or inside the motor itself. The tapping sound does not go faster if I apply the throttle. also FWIW theres another sound that doesnt seem to be normal at idle. it kinda sounds like how whenever you would turn the car on when cold and if you have a CAI and the IAC valve stays open for a bit you hear that 'whooosh'-ing sound, well thats kinda what i hear when the car's at normal temp and its not coming from the CAI/TB side either.
Car doesn’t slow down if I go into PE mode I notice no misfires while applying gas. Oil doesn’t seem to be contaminated with coolant. Does not sound like a lifter tick. Im gonna pull the plugs and see if the gap’s been changed/damaged. Last Friday I noticed I got the P0300 code for random misfires, but that’s like the 3rd occurrence since I had the VS cam installed since this past march. Aside from the lil race from this past Friday, I get no knock, if any 1-2* of random blips with the 3.1”. I did notice the car was having louder lifter tick ever since I switched to 5W-30a few weeks ago, but I don’t know if its coincidence or not as i did not hear the loud lifter tick since that specific night. I always been using Mobil 5000 10W-30 and this last oil change I used Mobil 5000 5W-30.
One idea is an exhaust leak, yet again, on the rear header, however I installed a new felpro aluminum gasket not long ago. another is a broken flex on the downpipe? Give me some ideas on what to check first on the outside of the motor then once I cant find anything, give me some more advice on what to check if it’s a possible internal issue please. Like stated, im gonna pull the plugs later to see how they are as well as look underneath the car and such. Thanks in advance.
