'89 F150 idle problem - Page 2
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  1. #26
    Join Date
    Jun 2012
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    Bemidji MN
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    Re: '89 F150 idle problem

    Quote Originally Posted by 131re View Post
    Does it have direct injection or TBI? If direct you can unplug each injector one at a time kind of like pulling a plug wire off- if you have a leaking injector when you disconnect it rpm shouldn't drop if it is leaking. If TBI- you have to take the injector out and check Youtube for how to clean injectors-you can use the same method to test to see if it is leaking.
    That is an OBD1 setup- you can 'read' the codes with a VOM after you jumper the appropriate pins in the test plug. Been too long to take it from memory but I can look in the AM for the pins. You count the swings of the needle for your codes and somewhere I should have the chart to decode or Google them. Yes on the gauge dropping.
    6 injectors, not throttle body.
    Dave J.

    Beware of false knowledge; it is more dangerous than ignorance. ~George Bernard Shaw~

    Airco 300
    Dialarc 250 AC/DC
    Invertec v250-s and v300 Pro
    ESAB 161
    SA200
    MM210
    Tried being normal once, didn't take....I think it was a Tuesday.

  2. #27
    Join Date
    Feb 2012
    Location
    Sparks, NV
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    3,129

    Re: '89 F150 idle problem

    Using propane to find a vac leak is about the best method I know of. I have a vac/injector gauge but you have to break the circuit to insert the gauge so propane is easier for me. If theres a leak, the propane gets sucked in and revs go up and you know the general area or line the leak is from.

    MDave, I had an '88 F-150 with straight 6. I still have the code reader with manual and was doing some clearing out. PM me if you want it free.
    _____Gauntlets_____

    ____Genesis 4:22___

  3. #28
    Join Date
    Sep 2013
    Location
    Upstate NY
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    2,181

    Re: '89 F150 idle problem

    The EEC-IV codes are near worthless. If the MIL ain't on, don't ask the computer for advice. It's reply will be "All operations are within normal parameters"

    My favorite is the fuel pressure regulator. If the diaphragm is bad, raw gasoline is being dumped directly into the intake manifold. Imagine a carburetor with a stuck open float valve.
    Be wary of The Numbers: Figures don't lie,. but liars can figure.
    Welders:
    2008 Lincoln 140 GMAW&FCAW
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    1970's Cobbled together O/A

  4. #29
    Join Date
    Jun 2012
    Location
    Bemidji MN
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    Re: '89 F150 idle problem

    Quote Originally Posted by mike837go View Post
    The EEC-IV codes are near worthless. If the MIL ain't on, don't ask the computer for advice. It's reply will be "All operations are within normal parameters"

    My favorite is the fuel pressure regulator. If the diaphragm is bad, raw gasoline is being dumped directly into the intake manifold. Imagine a carburetor with a stuck open float valve.
    That's my first check tonight. I figure if it leaks, it won't hold vacuum from my tester?
    I'll also put the pressure gauge on the rail and see what I find there.
    Dave J.

    Beware of false knowledge; it is more dangerous than ignorance. ~George Bernard Shaw~

    Airco 300
    Dialarc 250 AC/DC
    Invertec v250-s and v300 Pro
    ESAB 161
    SA200
    MM210
    Tried being normal once, didn't take....I think it was a Tuesday.

  5. #30
    Join Date
    Sep 2008
    Posts
    117

    Re: '89 F150 idle problem

    If it's bad not only will it not hold vacuum, if your vacuum pump uses clear lines you'll see the gas. Like mike837 said its like having a stuck float- vacuum sucks it right into the intake manifold. If you have E 85 gas and it truck sits good chance it ate a hole in the diaphragm
    Last edited by 131re; 01-13-2017 at 07:38 PM.

  6. #31
    Join Date
    Apr 2011
    Location
    minnesota
    Posts
    1,669

    Re: '89 F150 idle problem

    Probably not running e 85 but regular 10%ethanol will raise he'll with rubber.
    Millermatic 252
    millermatic 175
    miller 300 Thunderbolt
    lincoln ranger 250
    smith torches
    lots of bfh's
    If it dont fit get a bigger hammer

  7. #32
    Join Date
    Nov 2009
    Location
    Arizona
    Posts
    1,804

    Re: '89 F150 idle problem

    Quote Originally Posted by MinnesotaDave View Post
    . I figure if it leaks, it won't hold vacuum from my tester?
    .
    I watched a Scanner Danner video where he pulled the vacuum line off right after shutdown and it was wet with gas dripping from the line.
    Miller Challenger 172
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    Miller Maxstar 150 STL
    Victor 100C
    Victor Journeyman
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    No, that's not my car.

  8. #33
    Join Date
    Jun 2012
    Location
    Bemidji MN
    Posts
    11,749

    Re: '89 F150 idle problem

    ****UPDATE****

    Fuel regulator is shot!

    I unhooked the vacuum line, started it, walked around the truck to see a steady stream of fuel pouring out of it
    Dave J.

    Beware of false knowledge; it is more dangerous than ignorance. ~George Bernard Shaw~

    Airco 300
    Dialarc 250 AC/DC
    Invertec v250-s and v300 Pro
    ESAB 161
    SA200
    MM210
    Tried being normal once, didn't take....I think it was a Tuesday.

  9. #34
    Join Date
    Apr 2011
    Location
    minnesota
    Posts
    1,669

    Re: '89 F150 idle problem

    But you don't have to fix it now that it's done snowing for the year
    Millermatic 252
    millermatic 175
    miller 300 Thunderbolt
    lincoln ranger 250
    smith torches
    lots of bfh's
    If it dont fit get a bigger hammer

  10. #35
    Join Date
    Jun 2012
    Location
    Bemidji MN
    Posts
    11,749

    Re: '89 F150 idle problem

    Quote Originally Posted by farmshop View Post
    But you don't have to fix it now that it's done snowing for the year
    It's that type of thinking that requires every plow truck to be fixed in the middle of a blizzard

    Unfortunately, it will snow as soon as this snow is almost gone and will turn to ice under the new snow.
    Dave J.

    Beware of false knowledge; it is more dangerous than ignorance. ~George Bernard Shaw~

    Airco 300
    Dialarc 250 AC/DC
    Invertec v250-s and v300 Pro
    ESAB 161
    SA200
    MM210
    Tried being normal once, didn't take....I think it was a Tuesday.

  11. #36
    Join Date
    Apr 2011
    Location
    minnesota
    Posts
    1,669

    Re: '89 F150 idle problem

    Here in so mn it has been icy for a week. Just getting rid.of some of it now turning to mud
    Millermatic 252
    millermatic 175
    miller 300 Thunderbolt
    lincoln ranger 250
    smith torches
    lots of bfh's
    If it dont fit get a bigger hammer

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