04 1500 has me stumped

tim johnson · Mar 11, 2012

2004 Ram 1500 4.7 125,*** miles. truck would not start. checked fuel pressure, had 30 psi when I cycled the fuel pump, when i cranked it pressure jumped up to 60 psi. pulled #1 spark plug and checked for fire. it has spark. put the fuel pressure gauge back on it and cycled the pump, got very little pressure (less than 10psi ) till we cranked it and then it SLOWLY went up to around 38 psi. In the mean time , my son noticed that the fuel gauge did not move when the key was turned on. Also noticed that the overhead display did not show the temp or any of the other stuff it is supposed to display.
Put 5 gallons of gas in it and now it will start and run on what sounds like 4 cylinders and has no throttle response at all. Plus the gas gauge still does not register.

I am out of ideas, does anyone have any other things to check?

Thanks,
Tim

reefguy89 · Mar 11, 2012

do you have any codes? Could be clogged injectors? Also have you checked battery voltage(when it cranks)?

tim johnson · Mar 11, 2012

No known codes at this time. I did not check battery voltage but I will.

cwakefld · Mar 11, 2012

Was it out of gas before you put the 5 gallons in it?

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tim johnson · Mar 11, 2012

Battery reads 11.75 and goes down to 10.25 while cranking it.

tim johnson · Mar 11, 2012

cwakefld said:
Was it out of gas before you put the 5 gallons in it?

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I'd like to thank not, my son said he had 1/2 a tank in it the last day he drove it. But with 18 year olds you never know. Before I put the gas in it, it woiuld crank and act like it wanted to start but never start. Since putting gas in it, it will start but runs like doo doo.

HemiBabe · Mar 12, 2012

Hmm makes me wonder if it got low on gas and sucked up some junk from the bottom of the tank

tim johnson · Mar 12, 2012

HemiBabe said:
Hmm makes me wonder if it got low on gas and sucked up some junk from the bottom of the tank

I thought of that but what I don't understand is why the fuel gauge or any of the other gauges are reading anything. The overhead console has dashes for the outside temp and does not read anything for mpg or dte.

KGBIGCOUNTRY · Mar 12, 2012

The computer is freaked out, try a PCM reset to see if it will help. Im hoping the reset will get it going without having to swap PCMs.

tim johnson · Mar 12, 2012

KGBIGCOUNTRY said:
The computer is freaked out, try a PCM reset to see if it will help. Im hoping the reset will get it going without having to swap PCMs.

How do I reset the pcm? I dont have a scanner.

wermbang · Mar 12, 2012

Unhook the negative battery cable for say 10 minutes.

tim johnson · Mar 12, 2012

If that does not fix it then I need to get a new pcm?

KGBIGCOUNTRY · Mar 12, 2012

Its a maybe on the PCM, with the overhead screwing up thats pointing to an issue. By chance did he try loading a tuner into the truck? A partial load will do that also. A dealer reflash might also work.

tim johnson · Mar 13, 2012

KGBIGCOUNTRY said:
Its a maybe on the PCM, with the overhead screwing up thats pointing to an issue. By chance did he try loading a tuner into the truck? A partial load will do that also. A dealer reflash might also work.

No tuner was installed that I know of. I ended up having it towed to a guy here in town that is very good with diagnostics. Of course when you get the label very good you also get the label very expensive. I am on pins and needles waiting on him to call me with the news. I will keep you all in the loop.

KGBIGCOUNTRY · Mar 13, 2012

I have my figers crossed for it to be a simple fix

tim johnson · Mar 14, 2012

Well, I heard from the shop guy today. Bottom line is he says the pcm is fried. He is telling me that no one in the aftermarket makes a pcm that is plug and play. He says he can replace it but I will more than likely have to be towed to the Dodge dealer for more programming after it is installed. Thoughts?

Deed · Mar 14, 2012

PCM Flash Reprogramming Procedures

Get replacements here:
http://autocomputerexchange.net/ind.../?make=Dodge&gclid=CLqUmIv4564CFYe5KgodjTXahA

I say let the dealer do it...Takes to much time, energy, and expensive tools to do the job...but not only dealerships are capable of doing it.. hope this helps

nzornes44 · Mar 15, 2012

^^^X2 thats sucks bro best of luck.

KGBIGCOUNTRY · Mar 15, 2012

Shoot *** on here a PM seeing if he has any at his salavage yard.

tim johnson · Mar 15, 2012

KGBIGCOUNTRY said:
Shoot *** on here a PM seeing if he has any at his salavage yard.

I thought about trying to buy one from a salvage yard but I was not sure if it would need to be flashed or not.

04 1500 has me stumped

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