» » »

Ford Q&A

Ask Your Question

1990 Ford E-150 Question: My truck is hard to crank in the morning.

 

Question

HLD, 5.0L V8, Benson, NC, August 25, 2012, 06:34
 Rookie

When I go to crank my truck in the morning I turn the switch on and I hear the fuel pump come on.Sometimes it keeps running like its not building up pressure and the truck is very hard to get cranked.When I turn the switch on and hear the pump run and cut off the truck cranks fine.I noticed the other day when I turned the switch to accessories the fuel pump come on.Any ideas would help.Thanks

2 Answers
Flag This
  • Answer #1

    pushrod August 25, 2012, 08:30
    Profile_thumbnail
     Master

    Have fuel press. test Coolant temp. sensor test,scan test.

    Reply
    Flag This
  • Medium-star Best Answer
    MShaw August 25, 2012, 10:22
    Profile_thumbnail
     Enthusiast

    Try this. Before trying to start, cycle (turn the ignition switch) from off to run (that's when all the dash lights come on) 5 times, leaving it in the run position for 5-8 secs each cycle, then try to start the engine. If it pops right off, your fuel pump most likely needs replaced (it's in the tank). If that doesn't create a change, there is an electrical pulse issue between the crank sensor & computer (fairly unlikely), or a failing crank sensor (more likely). There is an outside chance you have injectors stuck open, causing pressure bleed off, as they drain the primed fuel (when you rotate to run & hear the pump) into the cylinders. It can be just one causing the problem, and if you suspect that, & have a multimeter, check the resistance across each injector (should be 10-16 ohms, approx). Usually if you have an injector issue, you will alo have an issue with how the engine runs, esp at idle.

    Flag This
  • Reply

    pushrod, August 25, 2012, 10:43
    Profile_thumbnail
     Master

    Or have scan test. Unless auto savvy. Profile don't say.

    Reply
    Flag This