1995 850 GLT, 181,000 miles. No real problems but idles a tad rough. Plugs, wires, cap/rotor all relatively new. Vacuum hoses appear ok. FWIW relative to clean engine have used Mobil-1 since bought the car at 90K.

I want to use Seafoam to clean engine top end. Have not found much discussion here about this stuff but quite a bit on internet that is not Volvo-specific.

Instructions are to slowly pour 1/2 can into a vacuum intake line while engine is running, turn off and let it sit, then start engine and run until smoke clears.

Looking for suggestions on which vacuum line to use. I expect pulling some may keep the engine from running (don't know that, just guessing). Experiences/testimonials/horror stories also welcome.

Thanks,

Terry

Pick the smallest line, but be very careful - the vacuum is strong enough to suck up the whole can! Too much at once will flood a cylinder and can cause a connecting rod to break!!

Let the engine 'sip' the fluid through the vacuum line, and make sure the engine is already warmed up. BTW, water works the same way and is a little cheaper.

Klaus
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Why are Volvos so endearing? Its just a car.