So I have been driving this truck around and it runs fine, seem like there is no issues whatsoever. I went to start it the next day after driving it the day before and it just cranked and would not turn over. This has been off and on where it usually starts but occasionally just wont turn over. When it does happen, it usually starts the next day or so just fine after sitting like there was no issues at all. Theft light isn't on. Check Engine light isn't on. It runs good but I would really like to get my truck to be much more reliable than its been. The truck is a 1999 F-150 XL 4.6L Triton Automatic 2WD. So far I have cleaned the throttle body and the Idle Air control valve. The fuel regulator is on the way. Other than that I dont know what's wrong and dont want to keep throwing parts at it. Any Ideas would be very helpful.

Edit. This has not happened in a while. It seems to only happen after the truck idles and gets shut off without driving. I've also Noticed a few times when I am driving it feels like the truck is going to stall when i accelerate. It makes a clunking sound and feels like the truck bounces. Any Ideas would be very helpful

 

Codes?

 

Not that I am aware of

 

Did you check for them?

 

There are no lights at all on the dash that would make me think there is. I can check at autozone later today. Can you still have a code even without a check engine light on?

 

Have you checked the fuel pressure ? Is the pump priming when the key finally gets to working ? When was the fuel filter last changed ?

 

That could very well be related.

If it were the IAC, it would start if you pressed the pedal down a bit, and it would smooth out pressing the pedal down a bit.

 

It runs fine when I am on the accelerator l, but idles rough

 

not sure when it was last changed, I just barley bought h to e truck. I believe the fuel pump is priming and I do have fuel pressure to the rail, I didn’t test with a garage but when I pushed against the Schaefer valve fuel came out

 

Borrow a gauge from Autozone. Requires minimum 28 psi to start and run. With it running, pull the vacuum line off the FPR, pressure should go up at least 5 psi. I'd change the filter on general principles.

Rough idle could be time for a tuneup - plugs, maybe wires, maybe coil packs. Wouldn't hurt to pull the plugs anyway and do a compression test, you may have bought a truck with a sick engine. If you change the plugs, use only Motorcraft and torque to 28 ft/lb.

You may need an IAC, but you can pull it and clean it with WD-40, work the plunger with a small screwdriver till it works smooth.

 

I cleaned the IEC and checked a few things, I found out the rough idle only occurs when the ac is on. Not sure why that would be. I also found that the hard ignition is due to a chip on the key. Probably is time for a tuneup with the plugs and wires. I’m going to do a gumout in the gas tank to hopefully free any loose dirt that might be affecting my injectors

 

Yes, it can have codes stored without the check engine light being illuminated. When my 2002 was turning on the starter but starting intermittently the PCM relay was the culprit and if this is the case you will have a P1000 stored. This shows up when you disconnect the battery, reset the codes, or the PCM isn't being powered up.

 

Use Techron, not Gumout.

 

Techron better for these trucks? I already bought the gumout but havent used it. Is it worth to go buy. Currently the truck is running and idling fine as long as the ac is not turned on while its idling. still got to figure that out but for now its still a working truck

 

Gumout is good as long as it says Regane on the bottle. That means it has the best cleaner PEA, polyetheramine.