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2001 f250 4x4 5.4lL changed speed sensor truck runs worse o/d light flashing .

Got a 720 code output speed sensor , changed sensor, started truck o/d light flashing idles rough will resetting computer clear this up?

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6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

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  • 625 Answers

SOURCE: obd code po200 and po300. 2002 chevy 2500 hd

this trucks have very coming problem with the injectors stuck open or close, and some times they just works great and some does not, dealer has an updated injector assembly, i recomend you to install this update and spark plugs and plug wires, if you had replace plugs and wires recently just redo the spark plugs with the injectors

Posted on Jun 15, 2008

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  • 1 Answer

SOURCE: truck starts, dies. truck runs good some days,bad the next

I had the same problem with My 1990 F150 300 6cylinder 4x4.....I cahnged all the same things you did, finally I sprayed a can of Gumout through the throttle body and it worked and ran great. Now I add fuel injector cleaner to the gas and a regular clean with the gumout and the problem has'nt come back. Good Luck to you and hope it works!

Posted on Oct 06, 2008

emissionwiz
  • 80531 Answers

SOURCE: engine runs rough at certain speeds 3.0 v6 flex-fuel 1999 ranger

Check and see if the EGR valve is leaking, to check this spray water on it at idle, if the water steams off the valve is leaking and is the source of your problem, also are you sure you hooked the new DPFE sensor up right? re-check it..

Posted on Nov 23, 2008

  • 636 Answers

SOURCE: Rough Idle/Runs Rough and low power

I would take it in and have them do a diagnostic on it, sounds like the cam shaft sensor to me.

Posted on Sep 19, 2009

  • 532 Answers

SOURCE: My 1996 Ford F150 4.9l 5spd. rough idle, poor drivability, stall

try replacing the throttle position sensor

Posted on Oct 24, 2009

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Would a code 720 cause the following problem?


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clear all codes, even hard codes.

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2000 ford excursion. OD light blinks, shifts hard, idles rough, kills some times. Turn off, restart and it clears until stop at red light or go in reverse then light blinks again. Changed both sensors on...


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1 Answer

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I would check for any vaccum leaks,
You can take a spray bottle of water and spray around the intake manifold with the car running at idle.
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good luck

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