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      08-04-2011, 07:43 PM   #1
BMWUltimateDriv3r
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Is direct injection inherently unreliable?

I know it achieves better MPGs and a lot of automakers are moving towards it but will it cause a lot more cars to break down?
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      08-05-2011, 04:35 PM   #2
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FSI V8s in general have problems with carbon build up in the valves. My RS4 had its valves cleaned once. Found a fair amount of debris and deposits in there. Not sure about other manufacturers
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      08-05-2011, 04:38 PM   #3
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Quote:
Originally Posted by wisesoul View Post
FSI V8s in general have problems with carbon build up in the valves. My RS4 had its valves cleaned once. Found a fair amount of debris and deposits in there. Not sure about other manufacturers
Some older Audi's were pretty notorious for this, as well as engine sludge.

As far as in general across brands, no idea.
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      08-05-2011, 05:49 PM   #4
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It's bad.
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      08-05-2011, 07:19 PM   #5
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DFI is not "inherently unreliable."

Oil in the PCV system is the problem with certain DFI motor designs. And first generations did not include effective oil separators. A properly designed oil separator will keep coking issues at bay (like Porsche and Mercedes are now doing.) DFI design and technology gets more advanced every year, and it's here to stay. There are a lot of advantages to a properly designed DFI motor; much more energy efficient with increased performance, and it can also run lean.

Again, there's a lot of R+D going into DFI and it is not going to be "inherently unreliable." Certainly no more so than a NA motor versus a modern FI motor (will there be any NA motors left soon?) These concerns also came up when carburetors started to go the way of electronic fuel injection. The argument was that EFI was never going to be as reliable as an old fashioned carburetor.
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