07-26-2006, 03:47 PM
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AF Regular
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Join Date: Jul 2005
Posts: 168
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Re: Drop in Fuel Mileage
You should do or have done that TSB for the P171/P174 codes. It sounds like your EGR ports are clogged. Oil gets past the PCV, gets into the intake, and over time clogs the EGR ports. Or another thing that happens is the vaccum hose cracks and get the same codes. If your engine light is not coming on yet, it will soon.
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1998 Blazer 4WD 4.3L 118,000miles 4dr
 Repairs
--rear main seal, u/l ball joints, pitman/idler arms, i/o tie rod ends, control arm bushings, motor/trans mounts, oil relocation lines, door pin bushings, water pump, ring/pinion.
--Bad ABS ground, loose connection blower motor, repaired pulse board.
 Mods/upgrades
-Throttle plate mod.
1999 Ford Windstar SE 3.8L 160,000miles
Repairs
--P171/P174 procedure, loaded control arms, tie rod ends, shocks, struts, springs.
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