does it only while giving it throttle. smells rich. what could it be? no codes but one time the ck eng light came on and it suddenly cleared up temporarily
Q&A
Ask Your Question1993 Ford F-150
Question: engine surges then bogs down only between 1000 to 1500 rpm driving and idling.
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Answer #1
globalhelper February 11, 2013, 12:44Masterposs plugged exh system.confirm with muffler shop
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frydaddy1, February 11, 2013, 12:55Rookiewth? would do it all the time if that was the case
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globalhelper, February 11, 2013, 13:15Masterthe more throttle u give the less exh can leave your system and will cause excessive back pressure
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frydaddy1, February 12, 2013, 11:08ReplyRookiethanks but it runs fine above 1500 rpm. does this change anything?
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Answer #2
csubak30 February 11, 2013, 14:40Reply
MasterAgree with #1
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Answer #3
bmdouble February 11, 2013, 21:13
JourneymanThe symptoms sound like a clogged exhaust,but another possibility that can cause a rich running concern is a faulty air charge sensor that is mounted in the lower intake.Whrn these go out they can make the exhaust glow cherry red due to excess fuel injected into the engine.Just a thought,and easy to check by removing it and looking at it.
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frydaddy1, February 12, 2013, 11:07ReplyRookieThanks. I think what everyone else missed is that it runs fine above 1500 rpm. the surge and die stuff cycles over and over between 1000 and 1500 rpm. I should have been more clear. it idles fine, just not at low rpm with throttle and honestly my exhaust needs to be replaced. btw it doesnt have a cat just true duals and a small crosspipe where the o2 sensor is.
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