Statistics for 3.0 failure rate

[alpineovernappa]

Jeep and Ram have recently released stats related to the gen2 ecodiesel recall for the CP4 HPFP. There are 138,645 vehicles in the recall and reports of 1279 failures. So can one deduce that the known failure rate is just shy of 1%? .9225 to be precise.

Sponsored

 

[SargeDiesel]

since we have the 3rd... how does this relate ? Am I missing something ? I'm new to diesels.

 

[fourfa]

Because as far as we know, it's the exact same Bosch CP4 fuel pump in Gen2 and Gen3 engines

 

[CerOf]

1% doesn’t seem terrible, unless it’s you. :/

 

[SargeDiesel]

Because as far as we know, it's the exact same Bosch CP4 fuel pump in Gen2 and Gen3 engines

thanks, I wasn't familiar with the acronyms CP4 HPFP

 

[fourfa]

HPFP = high pressure fuel pump. Direct injection diesels like these have to inject fuel into the cylinder near its peak compression, which for a diesel is very high. So the pump has to achieve even higher pressures, and if there’s a problem they tend to fail catastrophically.

Ordinary gasoline port fuel injection runs at much lower pressure so doesn’t see these kind of problems. There are also gasoline direct injection systems, but peak cylinder compression is a lot lower than diesel, so less stress on the fuel pump.

 

[Hootbro]

1% doesn’t seem terrible, unless it’s you. :/

Agreed but there is room for improvement.

A 1% failure rate in the aviation industry would mean 1150 airline crashes a day for perspective.

 

[DailyMoparGuy]

Agreed but there is room for improvement.

A 1% failure rate in the aviation industry would mean 1150 airline crashes a day for perspective.

And that’s why the commercial aviation industry is one of the most impressive accomplishments in human history. Unbelievable engineering and quality control.

The agriculture industry is another one that kinda blows my mind as well.

 

[mbrown2]

I could be totally off...but I would figure they would try to operate at 6 sigma....I know my math is probably wrong but I thought for 138645 if operating at 6 sigma it would like 15......1 percent for cars seems way too high...

Sponsored