For the past six months, I have been trying to fix my 733i . It seems like a vacuum leak but I can not find it. The symptoms very but now it starts well but well idle between 1700 and 1900 rpm. But before that, when it was cold, it started and run great for about 30 minutes. While it was running well, I drove up and go fresh gas. What can it be? Larry
84 733i Help
Apr 29, 2006
9 Replies
If it's idling that high you have a stuck idle control valve or a vacuum leak.
"John Burns" wrote
Or a bad airflow meter?
FloydR
I believe it to be a vacuum leak but cannot find one. The gasmilage gauge/vacuum meter fluctuates full scale both ways. How can there be that big of a vacuum leak? Is there any way to check or repair the idle control valve? Any ideas would be appreciated. Larry
Or perhaps a leak in the large flexible hose between the airflow meter and the intake manifold? The nice part about that one is that it's easy to diagnose and fix. Just flex it a bit and see if the idle changes. If the idle changes, that's the problem.
Ed
Easy, my 635 did it once. A 1" hose blew off the intake manifold, think the other end went to the idle control valve.
John - Thanks but I checked the idle control valve and the hoses look good and tight. Larry
Did you read Mr. Beroset's post? THAT is how there can be "that big of a vacuum leak." Get back to us with the results.
-- C.R. Krieger (Been there; done that)
I gave up and sold the car; but thanks for the input. This group is great. Larry
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