Depends on the car. Some covers actually help cooling, such as in many performance cars. Sadly, most just seem to trap heat to slightly lower engine noise.
I always figured, if a cover wasn't necessary, then the manufacturer would have left if off for cost savings. Your "front" bank connectors might be getting brittle since they are the closest to the exhaust manifold/heat flow. Just my opinion. Peace
with that cover on, the exhaust heat simply trap underneath the cover. Thus with the cover on must hotter than w/o it. The cover is totally unnecessary for sure. The manufacture put them on simply because it makes the engine looks "prettier" (or more luxury). Don't forget how superficial people are nowadays, if people see "prettier" looking engine under the hood, they automatically assume it's better. Same as people will trust better looking people than ugly people. Otherwise, no one will buy luxury clothing and put make-up on their face.
@@engrishsheep They also spend a lot of money on advertising. Costs millions of dollars and doesn't make their cars any better... But there's a reason.
I own a 2005 sienna with the same motor ,Imho it looks like the heat from the cooling fans that causes this as for mine everything that was not metal is kaput plus the Texas heat doesn't do any favors.
I wonder if the covers are to hide engine and discourage people from working on it so they take it to dealer. car dealers make more on servicing cars than they do selling them anymore.
I have always wondered if those covers had any practical purpose or are they for decoration and noise? maybe if you live in Alaska, it might keep engine warmer. I would think taking it off in summer putting it back on in winter might be a good idea.
same, I saw some 1 went to Alaska & they had to make a cardboard cover for the grill. the sound argument is good too, mine has foam under, most likely 4 sound than anything.
I have A 94 ES300 with only 46000 miles, new to me, I think I'm going to take my engine cover off too, is anyone else weighing in the idea thay the cover aids kerping coolant temp correct?
Covers now a days serve many purposes on modern day engines with more electrical solenoids/ devices and direct injection engine. It’s service mainly as a noise Insulator, both the top engine cover and larger bottom cover counter act a lot of noise that would be perceived to the customer as something being bad with the vehicle and obnoxious. As well as protection from the elements and rodents even though both of those depend on your area/ climate.
Rodents chew right through the plastic like buttered crackers, and splash sheilds/liners/undertrays are a completely different thing. You are correct in that the cover is mostly for noise and visual appeal as a secondary function. Some performance cars have covers that duct air, but most can be removed with no downsides.
covers are just for aesthetics. take them off every vehicle. my 2011 gmc ls engine cover wears through pcv hose and the wiring harness for the injectors. i always redo the wire covering with abrasion resistant splitloom, not the round plastic stuff, the thick fabric type from techflex. wrap the ends with heat shrink tape, then heatgun it, glue melts and secures splitloom.
