Compression Ignition Addict
Join Date: Jan 2011
Location: jamestown, nd
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It's the exhaust back pressure valve used during cold weAther to warm up engine. It was probably malfunctioning nd the previous owner wired it open. It won't hurt anything to run that way. A lot of people actually delete them
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94 F-250 reg cab 4x4 5spd 7.3 stroke. 3inch downpipe, 4 in exhaust. super duty turbo with 1.0 non wastegated exhaust housing ww2 and 360 thrust kit. Intercooler, MB diesel hpop, driven diesel complete efuel, 6637 air filter, kingpin dana 60.
09 F150 Lariat crew cab 5.4L v8
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