Stuck again...no start and no "wait to start" light

[high desert stroke]

Im leaning towards PCM/chip issue

 

[dustinz85]

Im leaning towards PCM/chip issue

I had this issue pulled the chip out and it started fine.

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[ghohouston]

Okay I see

 

[Jeremyleggett07]

how does that tie into the lack of WTS light?

Just offering thoughts from what u were saying about it started after cool down

 

[Zaairman]

Unplug your fuel bowl heater and see what happens, I bet your problem goes away.

 

[Arisley]

Unplug your fuel bowl heater and see what happens, I bet your problem goes away.

This. Also check the PCM relay.

 

[CSIPSD]

Money is on the PCM relay...

 

[Arisley]

Mine also. Everybody forgets about these little relays. Bet it is the same one Ford put in there 11 years ago. I carry a couple of spares with me all the time.

In a pinch, you can swap the blower relay with the PCM relay.

 

[high desert stroke]

So, I just wanted to update this. Truck been running fine the last month and yesterday it did it again. No wait to start light and would not start. So I yanked the chip and it fired up. So...It seems the chip has been the culprit all along. Today I get the SES light that stays on and had it scanned and came up with P0603. Is this just a byproduct of pulling chip?

 

[high desert stroke]

I had codes cleared and it hasnt returned......yet
Also through both 1393 and 1391 DTC's which is left and right bank GP's

 

[ghohouston]

603 is from you unplugging the batteries

 

[high desert stroke]

603 is from you unplugging the batteries

never unplugged battery

 

[ghohouston]

Scary! I mean its your truck, but you shoukd NEVER mess withbthe chip with batts connected or key in ignition, it can fry your pcm and or chip. And that code can also be thrown from installing/ un installing a chip, but usually people unplug their batts, theyre related.

 

[high desert stroke]

Well....crap. I hope I didn't damage PCM. Thanks for the info. Guess I'm still learning

 

[Big Angry Hillbilly]

Im gonna throw out "PCM reset" being caused by a vref short to ground.

 

[PSD715]

I've put THREE effin pcms in mine, cuz I'm retarded. Seriously, it's easy to unplug the batteries.

 

[Big Angry Hillbilly]

Especially with the p0603 - also verify KAPWR to the PCM as well.

 

[high desert stroke]

Especially with the p0603 - also verify KAPWR to the PCM as well.

What is KAPWR and how do I verify?

Also what is vref?

 

[ghohouston]

V ref is voltage reference, kapwr is keep alive power. Your pcm is fine if the truck is starting. You got lucky

 

[high desert stroke]

V ref is voltage reference, kapwr is keep alive power. Your pcm is fine if the truck is starting. You got lucky

Ok, thank you ghohouston.