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#1
08-01-2006, 11:03 AM
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Cleaning Intake Valves
My car is a ’92 201 w/2.3 ltr. with 185K miles.
I was experiencing an extremely high idle, so I have the whole intake off searching for vacuum leaks, and for a good cleaning. I actually found my air duct housing (the rubber bottom of the air flow sensor) had a major tear in it – I’m waiting for the part to arrive tomorrow. In any event, I’ve completely cleaned the air flow sensor, the throttle body, and the intake manifold. It was a disgraceful mess of carbon/fuel/crud. Everything is spotless now, but I can see that the intake valves are all “crudded” up. Does anybody have a slick way to clean them without removing the head? Thanks in advance for your insight. Jeff Pierce
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Jeff Pierce Current Vehicles: '92 Mercedes 190E/2.3 (247K miles/my daily driver) '93 Volvo 940 Turbo Wagon (263K miles/a family truckster with spunk) '99 Kawasaki Concours Gravely 8120 Previous Vehicles: '85 Jeep CJ-7 w/ Fisher plow (226K miles)'93 Volvo 940 Turbo Wagon '53 Willys-Overland Pickup '85 Honda 750F Interceptor '93 Nissan Quest '89 Toyota Camry Wagon '89 Dodge Raider '81 Honda CB 750F Super Sport '88 Toyota Celica '95 Toyota Tacoma '74 Honda CB 550F 
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#2
08-01-2006, 11:17 AM
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Seafoam.
During the 80's there was another product that you sprayed into the intake until the motor died, let sit for 30 mins. then blow all the crud out by reving...the epa banned the darn thing as it rivaled a volcanic eruption as far as smoke was concerned.
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82 300D....went to MB heaven 90 350 SDL....excercising con rods
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#5
08-01-2006, 01:35 PM
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I'm aware of each of the products mentioned (Seafoam, GM TEC, BG-44 -- and that the GM TEC comes highly recommended by professional techs, like ILUVMILS), and I'm aware of the proceedure in which you carefully allow said substance to be sucked into the intake manifold through a vacuum line. (or is there a better way?) I have my doubts that this is going to do a thorough job of cleaning -- I mean, I had to scrub this intake clean with carb cleaner and a brass brush! Is it possible for a simple chemical treatment to get similar results?
It would seem that since I have direct (albeit limited) access to the valves now, that maybe there's an opportunity to really clean them up. Would it be crazy to apply one of the above mentioned chemicals directly to the valves and scrub them with a toothbrush? (or am I just pissing into the wind on this one?) Thanks in advance for your further input. Jeff Pierce
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Jeff Pierce Current Vehicles: '92 Mercedes 190E/2.3 (247K miles/my daily driver) '93 Volvo 940 Turbo Wagon (263K miles/a family truckster with spunk) '99 Kawasaki Concours Gravely 8120 Previous Vehicles: '85 Jeep CJ-7 w/ Fisher plow (226K miles)'93 Volvo 940 Turbo Wagon '53 Willys-Overland Pickup '85 Honda 750F Interceptor '93 Nissan Quest '89 Toyota Camry Wagon '89 Dodge Raider '81 Honda CB 750F Super Sport '88 Toyota Celica '95 Toyota Tacoma '74 Honda CB 550F
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#6
08-01-2006, 04:40 PM
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I don't think just chemicals will desolve much caked-on crud.
In the early 1980's, BMW's used to have a lot of problems with intake valves " caking " up. Most dealers used a cure of blasting ( this is true ) crushed walnut shells at the intakes, followed by a good vacuuming.
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2007 C 230 Sport. 
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