Question about Jaguar S-Type
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Posted on Jan 02, 2017
SOURCE: Engine codes Po171 Po174 Po401
The vast majotity of Ford vehicles with P0171 and P0174 codes are suffering with a vacuum leak. The biggest culprits are the hoses going to the PCV valve. The rubber deteriorates due to heat and oil fumes. Check the hoses and rubber elbows between the PCV valve and the intake manifold. Pay very close attention to the rubber elbows. They crack on the onside and can be hard to spot.
Posted on May 21, 2008
it means you may have a big vacuum leak, or the maf sensors little wires inside of it are dirty and need to be cleaned, or the maf sensor failed. Also there is a TSB that says to remove the PCV valve on the valve cover near the radiator, Then remove the little rubber grommet and look inside. At about the 5 oclock position you may see a little hole on the plate that is above the valves . If you see the hole then your suppose to replace the valve cover.
If all this fails to fix the problem then you need to remove the intake plennun and inspect and replace the gaskets.
Posted on Jan 12, 2010
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