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Fast Idle on B21FT 200 1983

posted by  someone claiming to be Skip on  Sat Dec 1 07:43 CST 2007 [RELATED]

I've exhausted the usual fixes and am seeking help from the board. My '83 240 with a B21FT has suddenly developed a very fast idle (3K) at startup. This will last a good 20 min when it begins to alternate between normal and high. Eventually it goes normal. The engine is pretty much stock except for an MSD ignition. I have the MSD Tach Amp to provide a good signal for the tach, fuel pump and a feed to the CIS idle computer. Besides the MSD was in a year before this began. I've ruled out linkage problems and air leaks (I believe). Any suggestions? Thanks.

Skip
'02 S60
'83 242TI Flathood
'80 242 DL






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