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I have a 2002!lincoln ls v6 and have replaced the lower PVC valve and the 90 degree boot all new upper and lower intake gaskets. I noticed when I took it apart there was a 90 degree vacuum on the upper side of intake that had three little vacuum hoses for the egr and that had a crack in it. I can not find this part but the vehicle had been driving fine for about a year and now is throwing a code P0456 saying that a Evaporation Emission system leak detected. Very small leak! Could this be the problem? Anyone?

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General knowledge guy here..
It is possible, but.. Sounds like the vapor recovery system. Look under the hood for a black plastic canister with 3 or 4 rubber lines going to it. Generally tucked into a corner.. up front. Check the rubber lines for cracking or loose. Also check your gas cap as this is related to the same system. probably any emissions control garage shop will test it for free, or maybe an auto parts store.
Maybe an expert can chime in?..

Posted on Nov 21, 2013

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Posted on Jan 02, 2017

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it is down under the intake manifold. the intake manifold must be removed to get to it. this vehicle is known for developing a vacum leak in the elbow hose that connects to pcv valve, so ive done a few.

Posted on Feb 19, 2009

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SOURCE: Failed Emissions test. OBD


The trick to setting all the monitors is:
Make sure you have more than 1/4 tank of fuel but no more than 3/4.
Clear codes then Do Not cycle key off. Start vehicle and drive,make sure you do at least 2 minutes of steady spead between 40-50 mph and at least 2 minutes at 50-65 mph, usually about a 20 to 25 mile drive will set them..
If you turn the ignition off before the monitors complete then EVAP will have to see a 6 hour cold soak before it will attempt to run again.

Posted on Mar 24, 2009

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SOURCE: codes 171 and 174 2001 ford winstar

dont take soo much in consideration after you have make all this things, some time is on only for any wire faulty, or a shrt electrical arc in any place in wire system. ask auto tap mechsnics for this maybe they have similar case before.

Posted on Apr 06, 2009

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if you have the 3.8 liter its more than likely bad intake manifold gaskets or a cracked manifold. Ford has had several TSBs on this issue. O2 sensors do not go bad as often as mechanics say they do. I have a 1999 that after 100 dollars at the parts store solved all lean conditions on the top end. The manifold has three parts to it. A lower aluminum that houses the butterfly blades for the variable intake runners( known vacuum leak were rods protrude at passenger side of lower bad bushings likely cause). Middle riser which uses oring seals which dry out and cause major vacuum leaks. upper is more or less the top cover which uses one large oring to seal. Hope this helps!

Posted on Apr 18, 2009

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SOURCE: p0405 code.. changed egr valve and cleaned passage

The truck has two egr vales unless it's a 4 cylinder, then it has one, if it say your slipping and it's automatic change the filter and oil in the transmission and add Lucas transmission fluid conditioner to the tyranny. If the EGR valve is still giving a code then it means something in the egr system is not working, and one item that comes to mind is the purge canister valve on the evaporative control canister. To test find the purge valve and crimp it off with a pair of vise grips to close the vent then drive it. If it runs good then you have found your problem. Also low vacuum can cause the transmission not to shift correctly as it needs a vac. input for it to shift. Check your transmission fluid if it is brown and sort of smells like onions then the fluid is burnt and will cause all types of erratic behavior. And since I took the time to write this I would like to get some feed back as I am about to stop doing this.

Posted on Jul 21, 2009

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it is down under the intake manifold. the intake manifold must be removed to get to it. this vehicle is known for developing a vacum leak in the elbow hose that connects to pcv valve, so ive done a few.

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