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B230F Intake Manifold replacement 200

posted by  Mark's 240 on  Mon Sep 8 00:05 CST 2008
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last visit: Wed Feb 19 07:44 CST 2014
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Hi,

I have '90 240 with a stubborn rough idle problem. I replaced the injector seals and crank sensor (I had a crank sensor signal missing code) but the trouble remains.

I think the problem is an intake manifold gasket leak. The engine smooths out for a while when I spray carb cleaner under the intake for #3 cylinder. I thought it might be a cracked flame trap to oil separator box hose but I have the oil breather system disconnected and plugged at the metered port and intake snorkel while I do this.

My question is: The Bentley manual says you have to drain the coolant when replacing the intake manifold (or gasket). The FAQ for this site doesn't say to do that. Do I really need to drain the coolant? Just put new coolant in.

Any other advice would be welcome.

Thanks,

Mark
--
' 93 240 (Quinn), AW70, 130K. '90 240 (Amanual), M47II, 97K. '92 240 (Edgar), AW70, 170K, totalled parts car. Love to drive them when my kids let me!






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New B230F Intake Manifold replacement [200]
posted by  Mark's 240  on Mon Sep 8 00:05 CST 2008 >


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