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
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1993 Ford F-150 Question: engine surges then bogs down only between 1000 to 1500 rpm driving and idling.
Answer #1Greg's Orange Auto (13671 Answers) , Orange, CA - (714) 361-9386globalhelper February 11, 2013, 12:44Master
poss plugged exh system.confirm with muffler shop
Replyfrydaddy1, February 11, 2013, 12:55Rookie
wth? would do it all the time if that was the case
Replyglobalhelper, February 11, 2013, 13:15Master
the more throttle u give the less exh can leave your system and will cause excessive back pressure
Replyfrydaddy1, February 12, 2013, 11:08Rookie
thanks but it runs fine above 1500 rpm. does this change anything?
Answer #2csubak30 February 11, 2013, 14:40Master
Agree with #1
Answer #3bmdouble February 11, 2013, 21:13Master
The 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.
Replyfrydaddy1, February 12, 2013, 11:07Rookie
Thanks. 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.