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Old 02-22-2007, 11:59 AM
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190E won't run below 3,000rpm

My boyfriend changed the master cylinder in our 90'-91' 190E and after that, the car doesn't stay running below 3,000 rpms. We have to keep our foot on the gas. He's changed everything that he knows to change (that doesn't cost our life's savings). Any advice? The master cylinder itself couldn't have been the problem, but maybe he messed something else up while he was in there?

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Old 02-22-2007, 12:19 PM
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Location: east Tennessee (southeast USA)
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Hmmm. That could be a problem. Running that engine over 3000 rpms continously is not good for it at all.

Perhaps some wires were loosened?
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2004 Toyota Sequoia Limited 4wd
1991 Lincoln Town Car Executive
1991 Cadillac Sedan DeVille
1988 Mercedes 300SEL
1972 Chevrolet Caprice Kingswood Estate 9-passenger wagon
1973 Pontiac Grand Ville
(Prior MB's: 1974 240D, 1985 380SE, 1984 190D, 1993 400SEL)
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Old 02-22-2007, 02:50 PM
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check the vacuum line that runs from the intake to the brake power booster (the big "container" that the master cylinder attaches to). If this line is disconnected, there will be a HUGE vaccuum leak, and the car probably won't idle at all.

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