Whats the best way to clean these plastic intakes with little rubber seals? Pain, 22 Jul 2011. This is to release anything that might be trapped in the valves And yes you'll leak coolant so have plenty of towels, other than that it's pretty straightforward :thumbsup: • With dish soap or citrus based degreaser and hot water, scrub the runners as best you can. Figure 9. My 08 Intake manifold for my 4.7 has arrived and its pretty dirty. Plug one end of your vacuum line adapter into the vacuum hose you just pulled off; plug an 18-inch length of 1/4-inch vacuum line onto the other end of the adapter. What is the best way to clean the carbon and gunk fron the manifolds, the engine under the manifolds, and the cylinder heads - intake ports and around the fuel injector holds? The plastic manifold used on these 4.6L engines tend to split across the front, and break in the rear, without warning. But this method requires high effort and time, the time needed can be for hours just to dismantle the engine part.
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Y: How to Clean Carbon Out of an Intake Manifold Step 1. 6. A forum community dedicated to BMW owners and enthusiasts. A cracked plastic intake manifold can be fixed a couple of ways. Bringing the BMW community together. First clean your cylinders up. It seems like the only secure way is to clean the intake manifold with: walnut shell blasting Cause: Carbon deposits on the intake valves. Some engine degreaser, then rise and let soak over night in soapy water, then rinse and let dry. Leave to soak at least 1 hr. 0