Lean burn codes

[JustBadly]

Am having faults P0172 & P0174 telling me fuel is lean on left and right bank. The codes appeared at the same time, so today I changed the MAF, air filter & fuel filter and although better the fault is still there. It happens when I am slowing down (shut throttle) but will clear after a few seconds when driving off. So I suspect the fuel pump is on the way out. My guess is that the pump is stopping instead of reduced flow, causing lean burn for a few seconds. Not surprised since mileage is 95k so is probably original. Will order one unless you guys have a better suggestion.

[JOE-DOT-COM]

hi

usually air leaks on the intake system somewhere, if its doing i on shut throttle could be the flexi on the egr

wont be fuel pump that would give a different fault code as fuel pressure is monitored with a sensor

when you take you foot off the throttle coasting the injectors are turned off, otherwise you get unburnt fuel down the exhaust, which would destroy the cats

cheers

Joe

[JustBadly]

Might have found it! Checked over the engine for vacuum leaks and found a hole in the engine breather. Replaced the hose length, will see if all is ok next run.

[JOE-DOT-COM]

hi

looks possible, its usually leaks, and that age where they start to perish, especially if disturbed

cheers

Joe