SO Just How Reliable Are The 370's....Looking at Buying Used

fzgood · 07-25-2013, 04:08 PM

In addition to everything people have already stated, the n54 335i has a history of HPFP (high pressure fuel pump) issues related to the direct injection system. When I was looking at cars, my sense was that in the 335i/s community, HPFP was kind of like the steering lock problem with the Z... except there doesn't appear to be a reliable fix for the HPFP issue... and steering lock just means you're stuck at home or in a parking lot somewhere, while HPFP failure could mean sudden loss of power in traffic and being stuck on the side of the road. Also, the entire community seems to be on pins and needles to see if the N55 engine has the same issue.

Best of luck with your search.

cheshirecat · 07-26-2013, 10:10 AM

Quote:

Originally Posted by fzgood

In addition to everything people have already stated, the n54 335i has a history of HPFP (high pressure fuel pump) issues related to the direct injection system. When I was looking at cars, my sense was that in the 335i/s community, HPFP was kind of like the steering lock problem with the Z... except there doesn't appear to be a reliable fix for the HPFP issue... and steering lock just means you're stuck at home or in a parking lot somewhere, while HPFP failure could mean sudden loss of power in traffic and being stuck on the side of the road. Also, the entire community seems to be on pins and needles to see if the N55 engine has the same issue.
Best of luck with your search.

For what it's worth, the HPFP warranty has been extended to 10 years/120k miles.

The pump replacements seem to be working very well.

Some N55 engines have had the problem, as you've mentioned, but luckily BMW has been covering them under the same N54 policy.

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07-25-2013, 04:08 PM	#1 (permalink)
fzgood Base Member Join Date: Dec 2012 Location: Orange County, CA Posts: 136 Drives: '13 370z 6MT TS PW Rep Power: 27	In addition to everything people have already stated, the n54 335i has a history of HPFP (high pressure fuel pump) issues related to the direct injection system. When I was looking at cars, my sense was that in the 335i/s community, HPFP was kind of like the steering lock problem with the Z... except there doesn't appear to be a reliable fix for the HPFP issue... and steering lock just means you're stuck at home or in a parking lot somewhere, while HPFP failure could mean sudden loss of power in traffic and being stuck on the side of the road. Also, the entire community seems to be on pins and needles to see if the N55 engine has the same issue. Best of luck with your search.