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I have 1987 M6 that just went 80K. The cars runs great, except the gas mileage is a little low around 16mpg and it just passed emissions. . I changed the plugs rotor, cap, fuel filter and did a valve adjustment about 67K.
I decided to check the valves again before putting it back on the road this summer. With the exception of 5 valves all are sitting right on .28mm or little above at .30. One of the intakes and 3 of the exhaust are sitting at .25 mm. All seems fine, except one of exhaust value has zero clearance, which really concerns me. Iíve ordered a bunch of smaller shims, but wondering what are the chances the valve is fried or why it changed so much.
I guess the next step is a leak down test, though I never done one before. Can I do the leak down test while I have it apart?
Thanks for any suggestions.
It's the throttle by-pass valve... I do wish i took better photos and/or labeled the wires a little better...
Sorry for the false alarm
I am putting my engine back together, it's been apart a while.... Behind the intake (drivers side) a small block with (2) 10mm bolts are attached to my blockor head??, it's kind of square, about 2" by 1". What the hell goes to this thing. It looks as if something bolts to it??