Intermittent engine start trouble/help - Ford F150 Forum - Community of Ford Truck Fans

Go Back  Ford F150 Forum - Community of Ford Truck Fans > Pre-1997 F150 > 1987 - 1996 F150
Intermittent engine start trouble/help >

Intermittent engine start trouble/help

Topic Sponsor
1987 - 1996 F150 Still running strong! Talk about your 8th and 9th generation Ford F150 trucks.

Intermittent engine start trouble/help

 
Old 02-06-2019, 06:06 PM
  #1  
Junior Member
Thread Starter
 
Join Date: Jan 2019
Location: Georgia
Posts: 2
Thanks: 0
Thanked 0 Times in 0 Posts
Default Intermittent engine start trouble/help

First, this is my first fun/project/ learning truck. my other is a 2015 F-150. I am mechanically inclined(union electrician) and I finally wanted to start to learn how to work on trucks.

Ill get to it. I bought a 1996 F150 5.0L automatic 2wD about a month ago. Has 117,000 original miles, was told the tranny had been rebuilt/replaced(not 100% sure which) at 80,000 miles. Had all new belts as well and what looked to be a relatively new installed Alternator.

Had zero issues first week driving the truck. Few days after that I had driven around town maybe 25 minutes, truck sat maybe for 15 min, came back out to start it up and it wouldn’t start. Engine turned over each time I tried but wouldn’t fire. I gave it a few minutes and tried again and it started.

Obviously I wanted to address the issue so I researched all I could and things to fix or change. As of now I have replaced Fuel Filter, ignition coil, spark plugs, spark plug wires, dist cap and rotor.

Even after this still having same issue. Ill
go into detail. I turn key to on, hear the fuel pump prime, turn key to fire, engine turns over and engine sounds almost like it has started, I let back the key and it sputters off. Sometimes it does this 3-4 times. Sometimes only once. I have never had it happen on a cold start ever. I also have never had the truck just shut off on my while driving, actually runs really strong.

All gauges check out, nothing running hot, battery is strong when off and while running.

Most recent troubleshooting I have tried was to run the truck off the second fuel tank, trying to determine if it’s possibly a bad fuel pump and possible 2 bad fuel pumps.

Took it up to the store and same thing happened using this tank. Got the truck back home and swapped between the 2 tanks turning on and off. I definitely noticed it being much worse with tank 2, almost always not starting until I just held the key to keep turning over.

At at this point I def feel like this has to be a fuel injection issue, but again im new to this side of truck troubleshooting.

Thanks for taking the time to read this and any help is greatly appreciated.
Dunagan15 is offline  
Old 02-06-2019, 10:06 PM
  #2  
Bronco Guru
 
Steve83's Avatar
 
Join Date: Jan 2018
Location: Memphis, TN, Earth, Milky Way
Posts: 3,285
Thanked 383 Times in 351 Posts
Default

All the truck's details need to be in your signature as this caption explains:


(phone app link)


Stop replacing parts. If you still have the originals, put them back on (except the filter & plugs) since there's apparently nothing wrong with them; they're almost certainly higher quality than any replacements. If you suspect a fuel delivery problem, the first step is to measure fuel pressure with a gauge, as this caption describes:


(phone app link)


If you have the old plugs, compare them to the inside back cover of the Haynes (which you should buy & read, after reading this caption):


(phone app link)


As an electrician, you should appreciate these captions:


(phone app link)


Even if it cranks strong, they can STILL cause every electrical problem, so take the time to read & inspect.
Steve83 is online now  
Old 02-06-2019, 10:50 PM
  #3  
Martin
 
Join Date: Jan 2011
Location: Lehi, Utah
Posts: 2,463
Thanked 188 Times in 160 Posts
Default

Common on these trucks for coolant or air temp sensor to go bad and not throw a code. They'll still function but send out readings that aren't accurate. Use your obd2 scanner and see if temps correlate with what's reasonable for the moment. The system might even have any old codes the po erased in memory.
sdmartin65 is offline  
Old 02-18-2019, 10:48 PM
  #4  
Junior Member
Thread Starter
 
Join Date: Jan 2019
Location: Georgia
Posts: 2
Thanks: 0
Thanked 0 Times in 0 Posts
Default

I was able to test do a fuel pressure test today. With Key on engine off the guage peaked at 20 PSI for 1
second and slowly started dropping and eventually stopping at 1 PSI (took roughly 30 seconds to drop)

With key on Engine running PSI was at exactly 30 and held.

Based on the Haynes Manuel with KOEO I should be at 35-45 PSI and I believe it is supposed to hold there until I start the engine.

With that being said, should I be looking for a leak somewhere or do I have a fuel injection issue?

My gut is telling me is a fuel injector leaking which is why I’m having issues when the truck is warm. Is it better to just go ahead and change all 8 or just try and pinpoint the ones causing problems?

Last edited by Dunagan15; Yesterday at 08:43 AM.
Dunagan15 is offline  
Old Today, 01:01 PM
  #5  
Bronco Guru
 
Steve83's Avatar
 
Join Date: Jan 2018
Location: Memphis, TN, Earth, Milky Way
Posts: 3,285
Thanked 383 Times in 351 Posts
Default

The pressure with the key OFF is irrelevant, despite both Ford & Haynes specifying it. If the pump can make & maintain running pressure with the key ON, the engine can run correctly.

Fuel injectors don't leak. Ignore your gut. Test the things I listed before.
Steve83 is online now  
 


Thread Tools
Search this Thread
Quick Reply: Intermittent engine start trouble/help


Contact Us Advertising Cookie Policy Privacy Statement Terms of Service

© 2019 MH Sub I, LLC dba Internet Brands

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.
 
  • Ask a Question
    Get answers from community experts
Question Title:
Description:
Your question will be posted in: