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9 Posts
Discussion Starter #1
Hello
Does anyone have any idea why my 645 is playing up?
I’ve changed spark plugs, pcv valves, oil and filter.
Car is shaking on idle
And had a code come up on idrive saying engine error high pressure Continued driving can damage catalytic converter or something along those lines
Had misting codes
Running lean idle bank codes
Please help
BMW 645ci 2004 110k miles on it
271149
271150
271152
271153
271154
271155
 

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Moderator
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3,174 Posts
Failing coil packs usually cause an over-rich mixture - but it is still worth changing the coil packs on the affected banks - not trivial on some cylinders though! Lean mixtures are often caused by manifold leaks - in fact anywhere on the engine as crankcase pressure is controlled by manifold vacuum via the PCV's.

But, mixture errors are input versus output measured by the MAF and the Lambda sensors respectively - so it is worth changing the MAF before doing anything else....
 

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Vendor
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4,281 Posts
Have you done a smoke test on the engine and pipes
There’s a plastic y pipe under the manifold that breaks up and leaks

Also check the fuel pressure and compare to the diagnostics readings


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