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Re: M5 Runs worse over time (archive)
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Posted by ian M635 UK on October 04, 2001 at 05:37:31:

In Reply to: M5 Runs worse over time posted by Doug on October 03, 2001 at 20:03:43:


I would have a look at the air bleed valves around each throttle plate. If these are blocked then it can create the sympthoms you describe as the cold start up will get it's air from the main bleed valve(under the air box) but when this closes with the engine heating up their may be insufficient air supply through the individual bleed valves. Mine were in a terrible state (154k miles)and hot idel was vastly improved following the cleaning of the bleeb valves and associated channels

Best of luck

Ian

Hi,
I've got an 88 M5 with 107,000 miles on it. I'm having a great time driving this wonderful machine but it seems to run rougher the longer I drive it. When it's cold it seems normal. Typical high idle on start up and quite smooth idling for the first ...say...half hour. Then I'm up on the interstate dicing with the best of them. When I get to the next traffic light it's running rough. Is this a simple as plugs and perhaps air cleaner...or is this truely temp related?




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