hi
when you come back after 20 min. leave it run and check voltage from neg. (ground). to each of the fuses. when running should be around 13.5 , if you come up with anything less than 12 volts you might be getting close to the problem.
if you do come up with low voltage we could tell you how to back feed it to check it out.
in cars and trucks i have seen computers after running for a while they start to idle slower and slower until the the eng. quits.
on one dodge pu we had the scanner on it grafting the injectors and the graft just kept getting wider and wider until the the eng. quits. we replaced computer and it ran fine.
i have not read about any one here having computer problems.
but if you know anyone to borrow one from it might be worth a try.
herman
 
check the low tension coil leads to make sure they are clean and snug so they do not vibrate losing contact and causing misfire. Then make sure they did not damage the crank semsor jacking it up. Then TPS:D
 
Just my thought here.

Any electrical problem is difficult to pin point as we know and you would have cleaned and secured battery terminals I guess.
Your is an 05 and you say last year it was OK, it could be one of many things especially if it's ECU related as it operates on internally on low voltage so corrosion is a factor or faulty ignition switch.

So my line of thinking is connections, poor contacts, fracture wire at steering head stock, mostly as mentioned.

I would go through all the multi plug connections form and including Ign Switch, under the tank plugs and ECU + relays connections.

I went through mine last year and cleaned and re greased with dialectic grease as a maintenance procedure.. found a few corroded plug pins under the tank on my 05.

It's a bit time consuming and fingers get sore but it had to be done at that age for reliability.

Just mentioning because you seem to have tried the obvious.

Hope this helps..
 
Just my thought here.

Any electrical problem is difficult to pin point as we know and you would have cleaned and secured battery terminals I guess.
Your is an 05 and you say last year it was OK, it could be one of many things especially if it's ECU related as it operates on internally on low voltage so corrosion is a factor or faulty ignition switch.

So my line of thinking is connections, poor contacts, fracture wire at steering head stock, mostly as mentioned.

I would go through all the multi plug connections form and including Ign Switch, under the tank plugs and ECU + relays connections.

I went through mine last year and cleaned and re greased with dialectic grease as a maintenance procedure.. found a few corroded plug pins under the tank on my 05.

It's a bit time consuming and fingers get sore but it had to be done at that age for reliability.

Just mentioning because you seem to have tried the obvious.

Hope this helps..

I've thought of that too, but all the connections seem fine. If the sensors aren't the cause then this might be it. I guess it could also be the computer but I don't think so. The battery is less than a year old and the voltage is good. It's charging too. I bought a digital voltmeter that plugs into a 12 volt accessory plug that I installed. I will be monitoring that as well. It looks like this one.

2404209_1_car-cigarette-lighter-12v.jpg
 
Still the same problem. I plan to check all the fuses and the ignition. Very frustrating problem. No codes, and it runs great above 2,000. I tried all the obvious things. I might hook up a fuel pressure gauge too even though I ran the fuel pump test multiple times it would be nice to actually see what it is. Would a clogged fuel filter be a possibility?
 
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