1987 - 1996 F150 & Larger F-Series Trucks1987 - 1996 Ford F-150, F-250, F-350 and larger pickups - including the 1997 heavy-duty F250/F350+ trucks
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If you'r up to it, check pevious posts on the PCV hose. I started one a couple of years ago after I found that the hose goes right into the plenum directly in line with the #8 cylinder therefore dumping a lot of excess polutants and watervapour into the #8 cylinder. This can cause at the least a rough running engine and at worst a failure of the #8 piston. I recomended moving the hose to the vacuum tee in the center of the manifold (for manual trannys) or teeing into the brake booster line for trucks with an auto trans as there isn't a spare spigot on the vacuum tee if you have an auto trans. This was the first mod I did to my truck and it made a new truck out of it. I got the truck for a super deal because the dealer could't get it to run right. The next best mod is to block off the EGR. Both are dead cheap and cure a lot of driveability problems.
Blocking off the EGR valve will fool the computer and possibly cause the truck to ping and run lean. The computer compensates for the inert gases from the egr by running less fuel, so without the egr gases, it will run lean. But the PCV relocation is a good idea and a good safety measure.
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