Re: Escape 3.0 24 Valve Engine Howl
If the vac is good it will be hard to pinpoint. The 24V 3.0L is quite durable and I wouldn't overly concern myself with something that happens once every few weeks. If you can manage to post up a video of the noise one of us blokes on here should be able to better pinpoint the source.
A couple things I can think of off hand:
1. When you start the vehicle, is the A/C on, or do you have the fan setting in any defrost mode? Defrost and some floor/vent settings on the fan will engage the A/C compressor and can make some interesting sounds as it's hard on the system to start the engine, and have the A/C trying to run at the same time. It can also lead to early A/C clutch failure. The best thing is to turn the system off completely before shutting off the vehicle and not using a defrost setting until after the vehicle has been started for several seconds.
2. I'll point this one out anyway - Make sure the right engine oil is being used. My Taurus used the 5W20, as recommended by the dealer with the 3.0L 2V V6. Heavier oil will take a few more seconds to properly lube the top end of the engine. A local shop here was caught for using 15W40 years ago, instead of what the consumer specified because the shop owner was able to get the diesel oil for much less, and bought it in bulk! Over 700 vehicles were reported to be using the diesel oil.
'00 Durango R/T 360ci 290hp (modded); 138,500m
'06 Pontiac G6 GT 3.5L 220hp; 44,000m
'12 Chrysler 200 Limited 3.6L 283hp; 13,000m
'99 Taurus 3.0L 2V Vulcan 145hp; 154,300m - Traded
Amsoil in all vehicles!