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My car still being on jacks, I decided to do some arbitrary cleaning of my engine bay. Seeing as my IM was already missing some bolts I had a go at the rest and took off the IM entirely. The inside was completely caked with black carbon shit, it looked like heart disease for a car.
I was so pissed off angry in the moment I didn't stop to take a picture, but I uploaded a photo that I found to be the closest to what it looked like inside my IM.
Anyone have a theory to why this buildup occurs and how to prevent it? Because I have never heard of or seen something like this is my life and I'm seriously hoping this wasn't due to neglect from the previous owner.
PIC FOR REFERENCE I'll upload my actual IM when I get some more free time again.
Last edited by 1black_seven; 10-02-2017 at 11:55 AM.
^^^^^ In a non-DI engine, octane has no bearing on clean/dirty burning. All octanes of gas burn equally dirty. It's the additives used by the refiner/distributor that keep deposits down/to a minimum.
When I picked up the car a month ago, I checked the air filter and it was caked black and yellow. Probably from all the pollen out in Knoxville but it looked like it had never seen light in some years. I really wish I was exaggerating but it was pretty teribble. Here where I live I use Ethanol free 91 Octane. I've only had the car a month but I run sea foam about every 6 months. Picked up some BG44k for after when the car is running on 4 wheels again.
Grade or brand of fuel has no bearing on the crap in that manifold.
An OEM style air filter, clean or dirty, will not cause the kind of buildup in that manifold.
My best guess would be the engine has a lot of blowby and/or is burning lots of oil and what you're seeing is from the PCV and/or EGR systems.
Long story short, that ain't normal; I've pulled apart engines with over a half a million miles on them with intake manifolds which were far-FAR cleaner.
Edit: Looking again at the picture, I don't recognize the manifold; what kind of engine is it from?
Last edited by horseshoez; 10-03-2017 at 07:22 AM.
my RL IM is no where look like that, if anything its just a light layer of carbon also noted the car has 120k miles and previous owner and I took great care of the car.
07 V6 Accord intake manifold after 10.5 years, I opened the whole thing up recently. Does yours look like this? How can you be pissed off? haha, it's normal.
You need to install an oil catch can to separate the oil from the air in the path of the PCV to get it cleaner. EGR valve is another contributing factor but blocking that off reportedly requires some ECU reprogramming because the ECU looks for electrical signal from the EGR valve. Be glad that the older J series does not use direct injection, that's why the valves look very clean because fuel sprays on top of the valves.
10-02-2017, 11:53 AM
Absolutely disgusting intake manifold
