1987 Ford F-150 idle bouncing

Tiny
DON33
  • MEMBER
  • 1987 FORD F-150
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 87,500 MILES
My daughters ford pick up idle bounces when in park and when you first put in gear but only does it for a minute then is fine runs great when you drive it ive change the egr valve throttle position sensor idle air controller cleaned the throttle body new fuel filter fuel pump cap rotor spark plugs and the other basics she just turned 16 and got her license today ide like to get it running right for her I did put on code reader and came up fuel pressure curcuit but dont know where to start
Tuesday, July 20th, 2010 AT 10:13 PM

12 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 110,176 POSTS
Have you checked the fuel pump pressure?
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Tuesday, July 20th, 2010 AT 10:17 PM
Tiny
DON33
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  • 11 POSTS
No have not done that doesnt it have two it dual tanks idle bounces on both if so what one thanks
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Tuesday, July 20th, 2010 AT 10:24 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 110,176 POSTS
It could if the fuel pressure regulator is bad. There is only one that regulates both. It is on the fuel rail. There is a vacuum hose going to it. Remove the vacuum hose and see if there is any evidence of fuel getting into it.

Let me know what you find or if you need directions for checking it.
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Wednesday, July 21st, 2010 AT 12:01 AM
Tiny
DON33
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  • 11 POSTS
Chaecked the fuel pressure today the pressure is 50 it says its supposed to be between 33-39 is 50 bad
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Wednesday, July 21st, 2010 AT 10:57 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 110,176 POSTS
Yes, that is too high. I would say the regulator is bad.
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Thursday, July 22nd, 2010 AT 12:47 AM
Tiny
DON33
  • MEMBER
  • 11 POSTS
Changed the regulator today still doing it now im really stumped
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Friday, July 23rd, 2010 AT 8:13 PM
Tiny
DON33
  • MEMBER
  • 11 POSTS
Hey just found out my buddy that did the pressure test said the pressure is supposed to be between 50-59 mine was at 43, also found out that the egr that is new is not getting any vaccum what could that be
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Friday, July 23rd, 2010 AT 8:45 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 110,176 POSTS
The fuel pressure is one problem. As far as the EGR, check the vacuum hose to make sure it isn't plugged, damaged, or disconnected.
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Saturday, July 24th, 2010 AT 1:14 AM
Tiny
DON33
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  • 11 POSTS
I checked that also took to vacuum line off that goes from the egr to whatever is sitting below the egr that part seemed clogged with something I took it apart and blew threw it couldnt get ari out of one of two ports but dont know what it is it has two vacuum line connection on bottom and a filter on top with an electrical connection off the side
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Saturday, July 24th, 2010 AT 10:22 AM
Tiny
JOSHUA028
  • MEMBER
  • 13 POSTS
What does the vacuum regulator loom like. I am having a vacuum problem with my 2001 ford f150.
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Saturday, July 24th, 2010 AT 12:59 PM
Tiny
DON33
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I going back to the new tps I put in I took it over did code reader again and the tps keeps coming up is there something that leads back to that or am I just lost cause I confused sorry for jumping around so much
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Saturday, July 24th, 2010 AT 2:24 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 110,176 POSTS
Can you upload a picture of the part? I'm not sure what you are describing.
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Saturday, July 24th, 2010 AT 11:20 PM

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