Not starting.

[Shaner]

Hello.

New here.

Beginning November our 01 started running rough and hard to start.

Now it doesnt start at all. It's been sitting for a month.

I just sprayed starting fluid in the intake and it did start for a second but more of a putter putter and not a full on vroom.

Where should I start?

5.4.

I noticed threads about the intake, iac, fuel pump, fuel relay...

What routes would you take? What to test first?

Thanks and happy new year.

 

[Plati]

when was last time fuel filter & air filter was changed?

 

[1955moose]

Start with a fuel pressure test. Probably a failing pump, or broken pickup from pump. The fact it wanted to start with starter fluid and sputtered is fuel related.

Sent from my N9131 using Tapatalk

 

[Shaner]

Ok here's what I just did.

Turned the key back and forth a couple times, truck started but only for two seconds. It did this over and over.

Hooked up a fuel pressure gauge.

Read 33 but ran fine. Started right up after I screwed the gauge into the passenger side fuel rail. Took a lap around town, fuel gauge was at 25 when I parked. Released pressure, gauge went to 32.

 

[1955moose]

By turning the key on/off your priming a weak pump. Your pressure is good enough to run but the drop tells me it's leaking either at pump, line, or injectors. If you had a clogged filter you wouldn't have pressure that high. I had a hard starting problem about 3 months back, I swapped the #301 fuel pump relay with the one next to it. Problem went away. Might try that for now. You'll have to find out why your dropping pressure. These pumps do fail after about 15 years, some sooner.

Sent from my N9131 using Tapatalk

 

[Shaner]

What is the pressure supposed to be?

 

[1955moose]

Key on, engine off should be 35-45 psi. Key on engine running 28-45. What happens though is a hose next to pump deteriorates causing pumping problems. If you have any exaust/intake leaks, that doesn't help, I'd do a full fuel diagnostic procedure before dropping tank. Maybe one of the others can post the procedure. Sorry I'm working off Android phone, kinda basic.

Sent from my N9131 using Tapatalk

 

[Shaner]

No problem. I thank all of you for the info you already provided. You are all a huge help.

 

[Adieu]

It sat for a month? Your battery is probably kinda flat

Get a portable jumpstarter if you sit your vehicles unused regularly... beware that smaller ones reportedly won't juice v8's, though

 

[Shaner]

It sat for a month? Your battery is probably kinda flat

Get a portable jumpstarter if you sit your vehicles unused regularly... beware that smaller ones reportedly won't juice v8's, though

Already charged it.