Question about 1988 Ford F 250

4 Answers

I have a 1988 super duty. I bought it not running (GOOD TRUCK,Got it cheap) and it has no fire to the plugs,no power to fuel pump,the coil has power in with the key on and power out,(is that correct)? The last owner has replaced the dist module,pick up,inertia switch and coil from what I can see( I guess after that,he lost interest and put it for sale). All the wiring harnesses are untaped and the ecm is just in its hole,not bolted in. I assume from checking for the problem. I hot wired the fuel pump and it works and pressurized the system. Any ideas on where to start? Which one of the 3-4 relays is the fuel pump relay? Help would be appreciated,Tom

Posted by on

  • 3 more comments 
  • tompands Sep 20, 2009

    I wasn't aware that a1988 460 engine had a crank and cam sensor. I just called auto zone and they said that THEY couldn't get either one. Do you have any idea where they are located? I'm assuming the crank sensor would be in the bell housing somewhere. I hope it could be this easy! I have another super duty with a 460 and for some reason, finding parts for these trucks, is very difficult. I call FORD and all they tell me is "IT'S OBSOLETE". I've been looking for an engine harness for my other truck for 6 months.

  • tompands Sep 21, 2009

    Does a 1988 Ford 460 even have a crank and cam sensor? I wasn't aware these sensors were on this engine. Where would they be located?

  • tompands Sep 22, 2009

    I understand this vehicle needs a signal from the crank sensor, but what does a 1988 460 USE for a crank sensor? There is nothing around the balancer or in the bell housing. Where does the signal come from? Something specifically has to activate the fuel pump AND coil,that is not doing it's job. Could the fuel pump relay be causing this problem? According to FORD, the black relay base is the fuel pump relay,then there is a green base and a brown base. which one is the EEC relay? IF these relay all show to be good, what is my next thing to check?

  • tompands Sep 22, 2009

    replace the computer? how do you know it's bad?

  • tompands Sep 25, 2009

    I changed ALL the relays AND the EEC. I now have power to everything except still no fire to the plugs. Before I had no power to anything(fuel pump,injectors dist). We are narrowing it down,tomorrow we should have it. Thanks for your help.

×

Ad

4 Answers

  • Level 2:

    An expert who has achieved level 2 by getting 100 points

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

    Sergeant:

    An expert that has over 500 points.

  • Expert
  • 247 Answers

Make sure that ecm belongs with that motor,sounds like this truck has been an electrical nightmare,check his work inside the distributor,check module and picup coil wiring to verify its correct,when you fire up the fuel pump ,you will hear that relay click ,,unless you totally rewired it,otherwise,find someone with a manual,or the chilton books at the library

Posted on Sep 22, 2009

Ad
  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    Superstar:

    An expert that got 20 achievements.

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

  • Master
  • 11,896 Answers

The computer will need to be replaced.

Posted on Sep 22, 2009

Ad
  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

    Vice President:

    An expert whose answer got voted for 100 times.

  • Master
  • 784 Answers

Some cars need a signal from crankshaft sensor. If there is no signal, then it wil turn of the power to the primary coil and fuel pump. That is a later part.
Your idea is to check its basic function from Fuel, spark is a way to start.
1- Let's start witt your idea for the Fuel pump independly from a relay. After it works then a schematic will tell you which one. You still have a few more step to that.
2- Let's check the spark produced from the coil independently from the ignition module.

a- Take off battery cable to the engine.
b- Connect power to the primary coil to batery.
c- Make a pulse on primary coil by touch on and off either positive or negative wire to generate high voltage from the secondary coil. From this leading directly to a spark plug so you can see a spark or not.
d-With this information you know where to continue the troubleshooting.

Once you have basic spark anf fuel, then the rest is to find the control not making these happened for the engine to fire up.

Posted on Sep 21, 2009

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

    Vice President:

    An expert whose answer got voted for 100 times.

  • Master
  • 691 Answers

Sound like you have firing and fuel flow problems. being the year and Im sure it has many miles, Yes, you should always have full 12V charged in the coil when the ignition is on. The coil may be charged with 12V and not dispersing any charge to the plugs when cranking/turning the motor over because nothing is telling the coil to disperse the sparks, more likely will be the cam sensor. I would go ahead replace the CAM and the Crank sensor both. cam sensor responsible for timing telling ecm to disperse and send fire from the coil to the distributor, and than distribute the sparks to the plugs. crank sensor does the same but work the fuel pump. the electric fuel pump will not turn on unless the crank sensor sense the flywheel is turning and have to stay turning to keep the fuel pump on. if you have to replace any relays of fuses, computer, get it from a junk yard. hope that help a some

Posted on Sep 20, 2009

1 Suggested Answer

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi,
a 6ya Mechanic can help you resolve that issue over the phone in a minute or two.
Best thing about this new service is that you are never placed on hold and get to talk to real repair professionals here in the US.
click here to Talk to a Mechanic (only for users in the US for now) and get all the help you need.
Goodluck!

Posted on Jan 02, 2017

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

1 Answer

ASK SEARCH HOMEANSWERPROFILESIGN IN Problem with 1988 Dodge Ramcharger 1988 dodge ramcharger 5.2 liter. no fire or fuel.replaced computer and coil still no fire or fuel.jumped 12volts from battery to...


Without a voltmeter and a wiring diagram, you're in a bit of a fix. But I would be wondering why the ignition switch isn't sending power to the coil primary positive terminal, and why it isn't causing the fuel pump to be turned on, too.
Is your check engine light on with key on? The computer should sense ignition is on and briefly turn on the fuel pump through the fuel pump relay, on just long enough to pressurize the fuel line to the injector. But no fuel or fire-you'd better start by checking if the ignition switch has power in and power out, and work your way to the coil.

Nov 21, 2013 | Cars & Trucks

1 Answer

No fuel and no spark


fuel pump , fuel pump relay on fire wall, fuel filter, may all need replaced, pump in tank, inspect all wiring in this circuit, especially all grounds,, grounds get overlooked & that is sometimes the problem. I have a 1988 gmc 2500, I 'm talking from experience. can you hear if fuel pump runs for 2 seconds, when you turn key on ? if not, ground problem or pump problem. relay has a fuse in it, check that. check all fuses. NOW, spark ! coil ? plug wires ? distributor cap & rotor ? replace them if you haven't !!!!!!!!!! get to work, see how you do ! good luck !

Mar 05, 2013 | 1989 GMC K1500

1 Answer

My 2006 xlt deisel 6.o engine, cranks real fast umumummumumumummmmmmmmmm but it does not seem to be firing ccertainly won't start.


Check all of your glow plug wires, if they are all on it may be your glow plugs or your fuel pump, glow plugs are cheap and dont cost much and are easy to replace. fuel pumps are not cheap and are very complicated to replace. I hope this information helped. Be careful and drive safe!

Feb 27, 2011 | 2006 Ford F-250 Super Duty

1 Answer

The truck parked when i reve it up seems fine i go to take off it doesn't want to go it's like it's running on two cylinders


the problem could be a lot of things like. plugs not working right under load, plug wires, bad or clogged fuel filter, coils etc. check out the fuel filter first. then go from there. have a good day !!

Dec 02, 2010 | 2000 Ford F250 Super Duty Crew Cabs

1 Answer

I have a 1988 ford f150 with a 5.0 not getting power to eather fuel pump. replaced relay. bench tested both pumps an they test good. truck will fire and run with starting fluid then dies like it will...


replace the oil sending switch on the motor. upon starting the engine this switch has a 3rd wire connected to the fuel pump
when oil pressure is running at its normarl psi the computer will shut that circuit off and then turn on the fuel pump relay

Aug 08, 2010 | 1988 Ford F 150

3 Answers

Ford f350 diesel truck 30 amp fuse keeps blowing.


It is the fuel heater, All you have to do is unplug it.a4c0d50.gif

Dec 27, 2009 | 2000 Ford F350 Super Duty Super Cab

1 Answer

I have a 2006 F350 suppercrew 4x4 dully truck. It has 6.0 deisel , my truck has lost power , is down to 10 miles per gallion and run a little rough what could be causeing the problem?


quite a few possibilites here, a blocked catalatic converter can do this, a blocked fuel filter, a blocked injector pump, if the exhaust is emitting dark black smoke, your injectors could be blocked, I would suggest firstly to buy some very good injector cleaner and run it in the tank,, this may or may not help but its a cheap start and a cheap fix if it works. Good luck

Nov 19, 2009 | 2006 Ford F 350 Super Duty

1 Answer

2001 ford expedition, turns off after running a while.


have you checked the ignition coil(s) when its dead for shorted coils?

Sep 11, 2009 | 2001 Ford F350 Super Duty SuperCab

1 Answer

2000 F350 Super Duty V10 Power problem


Check the fuel pressure while the problem occures....needs to hold 35psi or so under load. You might also have ignition breakdown. Is the Check eng light on? You have coil on plug right? you really need a scanner to id the misfiring cylinder the try moving coils around to see if the problem move with it.

Jan 08, 2009 | 2000 Ford F350 Super Duty Super Cab

Not finding what you are looking for?
Cars & Trucks Logo

Related Topics:

99 people viewed this question

Ask a Question

Usually answered in minutes!

Top Ford Experts

yadayada
yadayada

Level 3 Expert

77499 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22306 Answers

fordexpert

Level 3 Expert

5613 Answers

Are you a Ford Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...