Question about 2005 Ford Focus
Why didn't tech follow through and find out why fuel air ratio was
incorrect? Knowing the what does not tell you why! Two items come to
mind, possibly a third...First, you may have a partially plugged fuel
filter restricting fuel flow. Second you may have an EGR problem If it
remains open, it can alter ratio. and possibly the throtle position
sensor may be out of range, causing the computer to get incorrect info,
in response, it may only be demanding the amount of fuel you are
getting. (I don't think that is the problem, but it is a possibility id
check if other items don't help.
With any control items, test carefully before replacing. This stuff is too expensive to just throw parts at it 'till the problem goes away. Fuel filter is maintenance and is no loss if it dosen't fix problem...Many egr valves can be cleaned and returned to service without buying a new one. Other components can usually be tested with a decent volt/ohmeter and a simple test procedure outlined in vehicle specific repair manuals available at larger parts stores. at about $20 for a manual it's cheaper than even one diagnostics mistake!
Dealer only parts happen when the manufacturer makes a change in design that is so vehicle specific that it does not pay for the aftermarket to manufacture that part due to low demand. (or, sometimes out of greed? but that's just my opinion) Most pcv valves can be cleaned out with carb cleaner though.
Posted on May 27, 2009
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Posted on Jan 02, 2017
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