91 150 5.8 EGR Problem

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Jan 7, 2004 | 07:14 AM

whaleral

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Joined: Oct 2003

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From: Freeport LI NY

91 150 5.8 EGR Problem

Truck was running terrible ruff idle no power ( F 150 5.8 ) 91
went to shop. found EGR has vac at idle screwed everything up
plugged vac line truck runs fine. Mech said to change oil in case was contaminated by such a rich mix .Question why is there vac at idle . What do I check
Thanks

AL

Jan 11, 2004 | 02:48 AM

bob arrington

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From: alaska

egr valves are only suposed to open off idle, if they open at idle they are leaking and are giving your engine a major vacume leak that it cant keep up with. a good way to test is to disconnect the vacume line to it and plug it . if your engine smothes out , the egr calve is bad , this fix usually saves a whole lot of carb. rebuilds, good luck , bob p.s. if your engine doesnt have to be smogged , leave the vacum line plugged , if it has to be smogged , you will probably have to replace the egr prior to doing that.,. theres nothing else to check, btw, you also found an honest mechanic .

Last edited by bob arrington; Jan 11, 2004 at 02:50 AM.