Thread: VF570 installed
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      12-15-2012, 03:52 AM   #77
GuidoK
#buildnotbought
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Drives: Z4 3.0i ESS TS2+
Join Date: Jul 2012
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Quote:
Originally Posted by pokeybritches View Post
Relying on OBDII to tell you if you're rich/lean is like waiting for your debit card to be declined to determine how much money you have in the bank.
If obd2 doesn't indicate that the mixture is too lean, the ecu itself doesn't know it. That means that probably your lambda probe is broken/not functioning properly.
It's the same as that you have a failsafe gauge installed which is broken....
So what's your point? You cant trust instruments that are broken?.... Really?

Maybe you should install a million backups... You know, just to be safe

But the statement you made earlier that obd2 wouldn't pick up a failing fuelpump is definately not true, no matter how you put it. And that is the starting point of this discussion, so really you're trying to change the subject.
If the diagnostics and ecu don't pick up a failing fuel pump, it means that both your fuel pump and ecu/sensors are broken. It's impossible not to detect the richness of the mixture, because otherwise the whole injection system with its fuel trims wouldn't work.
If you think otherwise, you diagnosed the problem wrong.
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