Intake cleaning using Senfineco

Neither. Sometimes more harm is done than good.
What exactly do you hope to accomplish with this operation ?

 

The video is worth a watch.

Product literally gives your vehicle an Intravenous complete with drip!

I would not do it to any of my cars

 

It is not NECESSARY to "clean" internal engine parts under normal circumstances.
Sometimes efforts like that loosens enough sludge that it clogs oil passages and quickly ruins the engine.

But it sounds to me like you have your mind made up already and are now obsessed with cleaning your engine out.
If you MUST do that, get a can of Marvel Mystery Oil and use that according to the directions on the can.
At least it is oil and won't do any damage.......if used correctly.

P.S. Seafoam is a combination of several light duty solvents and solvents should NEVER be mixed with your engine oil for more than a few minutes. It will thin the oil and can strip the oil film from critical parts and cause damage.

It sounds to me like you have fallen for marketing hype (lies) and that is not good for your health.......or for the health of your car either.

 

I don't think I'd have the patience to run the engine at 1500 rpm for 30-45 minutes as the instructions call for. From the video I suspect the primary benefit is that it will clean up the valve stems. It's not suggesting that it will clean out any build up before that point so where you tap into the incoming air delivery shouldn't matter.

 

Last time I had my intake manifold off (around 150,000 miles) I looked in at the valve stems, and they looked nice.

It's easy to look with the manifold off, and taking the manifold off isn't much work, and might be worthwhile now and then anyway, to check on its four EGR passages that don't always clog at the same rate.

 

I don't think these spray can cleaning with the manifold on the car are that effective; much more thorough cleaning can be achieved by full removal, cleaning out with brake cleaner or carb cleaner. Clean the throttle body thoroughly at the same time, with carb cleaner. Various diameter brushes are handy. I've also employed a grabber tool with a bit of rag in the jaws.

As mentioned by @ChapmanF , the small EGR passages (one per port) deserve special attention. I used a brush designed for cleaning steel drinking straws for that, nice long/skinny brush.

If you follow the EGR link in my signature, there's attachments, one of which shows intake manifold info, torque values and the like. Also, links to @NutzAboutBolts video on cleaning the intake. Do keep in mind, when removing the intake you do NOT need to disconnect coolant lines from the throttle body; they have enough play that you can just tie it off, out of the way..

A 38" or even 1/4" drive torque wrench will come in handy, for some of the lower torque values, throttle body hold-down bolts/nuts in particular.

The MAP (Manifold Absolute Priessure) sensor (just below throttle body) you could spritz with something like MAF (Mass Air Flow) sensor cleaner.

The MAF sensor is tucked round back of the air intake, just downstream from air filter box IIRC. FWIW that sensor stays pretty clean, and I'd only spray it (with MAF sensor cleaner) IF it was starting to look dusty/dirty.

 

I suppose if I had looked in and they hadn't looked nice, I might just have grabbed a rag and cleaned them.

It looked like the normal gasoline additive packages were doing the job: there was a thin layer of carbon on the inside surfaces of the intake ports, from right at the intake manifold junction just back to where the fuel injectors are. Everything that was downstream of the fuel injectors was clean.

 

The video says you can insert at the crankcase ventilation hose. This will bypass the intake manifold but not the throttle body.

 

Should be the other way ‘round: bypasses throttle body but not intake?

It’s NOT going to touch the Exhaust Gas Recirculation passages, for sure.

 

You’re right, PCV is after the throttle body. It’s also after the intake manifold.

 

The PCV air flow enters the intake manifold virtually directly below the throttle body; that doesn’t seem after.

 

I thought the manifold was the plastic part.