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Just noticed the other day when I fired up the motor in the driveway that it was making this squeaky-whistle? noise. See in short video attached. Could this be IAC valve going bad? The noise is definitely louder by the throttle body area. Or should I be looking for at the belt and pulleys...
Howdy.
Hoping someone can help shed some light on my concern here. I'm new to boating and this is my first craft. So please bear with me. I'm fairly handy and I plan on doing a lot of work myself.
My Mercruiser 165HP 6cyl (old school from 75 - I believe its Ford) with a early version Alpha...
So it appears this is my exact concern on my 1975 Mercruiser 165 6cly. The temp gauge on the dash is not reliable after I replaced the old temp sender on the block. So I use an IR gun to check engine temps on muffs and on lake. It seems to be in normal operating range. Around 150 to 160ish...
