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cookey
Novice
Feb 18, 2013, 7:57 AM
Post #1 of 17
(1779 views)
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1986 ford f-250 4 wheel drive 302 automatic. motor acts like its loading up with fuel or starving for air, replaced plugs, pickup coil, cap,wires, and brain,also air valve solanoid, started up fine now its like its flooding out. totalley dumbfounded. also timing is ok.
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Hammer Time
Ultimate Carjunky
/ Moderator
Feb 18, 2013, 12:32 PM
Post #2 of 17
(1731 views)
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Is this fuel injected?
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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cookey
Novice
Feb 18, 2013, 4:15 PM
Post #3 of 17
(1723 views)
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yes, new fuel pump,new high pressure pump, compression good, leak down ok, very puzzled
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Hammer Time
Ultimate Carjunky
/ Moderator
Feb 18, 2013, 4:24 PM
Post #4 of 17
(1718 views)
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Pull the codes and post the numbers here.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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Tom Greenleaf
Ultimate Carjunky
/ Moderator
Feb 18, 2013, 6:11 PM
Post #5 of 17
(1711 views)
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Who is doing all this work cookie? A 5.0 of the age a pick up coil is a pest. What is the compression not just say ''good'' and what is the timing. I think 10 degrees BTC is the setting but should be listed underhood if you can still read the sticker.
Like anything of the age vacuum controlled anything and hoses everywhere are suspect. Even the grommet where PCV goes in way down in back and hose to vacuum brake booster.
These should be counter rotating "302s" for trucks but basically the same as ones for cars. Test for codes as Hammer said. I forget which two ports you jump as I have the code reader for these - like was $20 or so and just count blinks underhood at connector.
If original timing chain it's highly suspect! You didn't want to hear that,
T
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Sidom
Veteran
/ Moderator
Feb 18, 2013, 8:04 PM
Post #6 of 17
(1695 views)
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If you have a voltmeter, check the EEC relay for a voltage drop......That powers a lot stuff & I've had a few of those cause some problems before.... It should be under the dash by the comp.....
Just a quick thought....
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Tom Greenleaf
Ultimate Carjunky
/ Moderator
Feb 18, 2013, 9:18 PM
Post #7 of 17
(1684 views)
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Right on Sid. It's the relay underhood with the brown skirting. I carry a spare. You know I haven't evolved out of this vintage yet LOL,
Tom
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Sidom
Veteran
/ Moderator
Feb 18, 2013, 9:25 PM
Post #8 of 17
(1681 views)
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I'm sure you have loads of those Tom..........lol.......Time frame is right on.....
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Tom Greenleaf
Ultimate Carjunky
/ Moderator
Feb 19, 2013, 1:07 AM
Post #9 of 17
(1672 views)
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Down to two fraud - oh I mean Ford products and a Cheby right now. Dang near picked up another '89 you know what..........
Jeez - I'm done with this crap so need another like two butts You can fit several sheets of plywood and a 1/2 dozen bodies in the trunk of those suckers and still close the lid and get 25 MPG. Gutless wonders though. What the heck went wrong with the world? LMAO -- Tom
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Hammer Time
Ultimate Carjunky
/ Moderator
Feb 19, 2013, 4:22 AM
Post #10 of 17
(1662 views)
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Not sure how you guys are coming up with EEC relay here.
motor acts like its loading up with fuel or starving for air,
now its like its flooding out
yes, new fuel pump,new high pressure pump, compression good, leak down ok,
You can't have fuel without an EEC relay.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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Tom Greenleaf
Ultimate Carjunky
/ Moderator
Feb 19, 2013, 11:47 AM
Post #11 of 17
(1644 views)
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There are physical points inside so can partially fail with odd behaviour. That's why you can whack one and sometimes they will snap to for a while. Been there done that -- T
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Discretesignals
Ultimate Carjunky
/ Moderator
Feb 19, 2013, 12:40 PM
Post #12 of 17
(1637 views)
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They were also known for the computer/pump ground connector near the battery corroding up and causing wacky problems too.
Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.
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Hammer Time
Ultimate Carjunky
/ Moderator
Feb 19, 2013, 1:00 PM
Post #13 of 17
(1628 views)
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The EEC relay powers the fuel pump relay. You don't get fuel without the EEC relay.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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Tom Greenleaf
Ultimate Carjunky
/ Moderator
Feb 19, 2013, 6:04 PM
Post #14 of 17
(1612 views)
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Doesn't matter as they can go weak and still run. Much like lousy ignition points. The origs are such that you can't swap them around because of the skirt. The aftermarket will fit in any but so far I find they don't last well.
Note no bump that makes the generic fit all. Newer frauds you can swap out one to another but not this vintage if original stuff.
Note to any readers. The bail that holds these gets PUSHED to release be at a glance looks like you would PULL. Says PU-SH on the two sides of the retaining bail.
Not sure but OE Ford part isn't that expensive if available at all now. Not really worth the trip for many -- Tom
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Sidom
Veteran
/ Moderator
Feb 19, 2013, 8:44 PM
Post #15 of 17
(1596 views)
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The ones I ran into were so long ago I don't really remember all the specifics......The main one, the OPs post brought back bad memories....He didn't post much but it sounded like the F150 that ate my lunch....Similar symptoms.....It ran like total crap, barely driveable but the only difference it some times it would run great...
The EEC relay was working but had a voltage drop that was causing the problem, it powers a lot of stuff......DS brought some good points on the grounds to....
There really wasn't much info post to begin with so odds are we'll never know....
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cookey
Novice
Feb 24, 2013, 11:28 AM
Post #16 of 17
(1541 views)
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where is the map sensor located on this 86 f-250 book says by the evaporator, not there.
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Discretesignals
Ultimate Carjunky
/ Moderator
Feb 24, 2013, 11:32 AM
Post #17 of 17
(1540 views)
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Located near the starter relay.
Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.
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