BenzWorld Junior Member
Date registered: Mar 2011
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c230 2003 what is the correct fuel pressue.
I have a p0170 fuel trim code.
Freeze frame showed Ltft of 12.5
I have no vacuum leaks and a new MAF. Car runs and idles smoothly.
Power on acceleration seems low.
Secondary air injection looks like it's working fine.
I had the injectors bench tested and they are good.
Next test will be fuel pressure. I'm guessing that low fuel pressure
could cause a fuel trim error.
I have changed the fuel filter too. The fuel filter is also the fuel pressure regulator.
The fuel rail does have a fuel pressure damper
What is the correct fuel pressure measured at the check valve on the fuel rail?
I found the specs.
3.7to 4.2 Bar
54 to 61 psi
Last edited by FredBGG; 07-29-2012 at 09:36 AM.