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Discussion Starter #1
Occasionally after a long run my 07 2.5 has a lumpy idle which goes away while the brake pedal is depressed.

There also seems to be a smell of exhaust fumes at the same time.

None of these things happen all the time but occur together when they happen.

The rest of the time it runs as sweet as anything.

Any ideas anyone?
 

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Not sure why brake pedal has any effect but lumpy idle and exhaust fumes could the very common cracked exhaust manifold. Have a look for signs of exhaust gases in the engine bay. I find using a torch in the dark shows them up well.
 

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I was under the impression that the 07 and later manifold was redesigned and not prone to the same cracking issues?

Are they in fact all the same with the same failure issue?

It's the brake thing that's the weird bit.
 

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I was under the impression that the 07 and later manifold was redesigned and not prone to the same cracking issues?

Are they in fact all the same with the same failure issue?

It's the brake thing that's the weird bit.
I was under this impression to, mine is december 08 2.5 and having the dreading manifold issue. Not sure if its just the gasket or the manifold itself (or both). Any guru's advise on the manifolds in post 07 buses?T:
 
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