Truck killing issue...Need help.
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New User
Joined: Jan 2012
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Howellt39 - I have ran thru all the fuses about 4 times, none have blown. I replaced the DS UVCH because I could see bare copper where the insulation was cracked on four or five wires. Instructions for what everything should be reading would be awesome. As for all the wiring...I took everything off the top of the motor darn near and fully inspected the wiring harness all the way to the firewall. Surprising enough, Zero chaffing and the harness actually never appeared to have even made contact with the VC at all. All the connections looked good, still had some dielectric grease in them. I am located in Mankato, MN.
falconwrench - Everytime it dies has been basically directly across the road from radio towers. I've checked, cleaned and reinstalled around a dozen grounds already, gonna replace the IPR pigtail this week hopefully.
falconwrench - Everytime it dies has been basically directly across the road from radio towers. I've checked, cleaned and reinstalled around a dozen grounds already, gonna replace the IPR pigtail this week hopefully.
Cargo Master
Joined: Mar 2006
Posts: 2,502
Likes: 2
From: Bend Oregon
just throwing this out there
what if the fuel bowl heater was loose in the bowl and shorted out just long enough draw the PCM voltage down but not blow the fuse?
as a "what the hell" I would unplug the fuel bowl heater just to see if there was any change.
what if the fuel bowl heater was loose in the bowl and shorted out just long enough draw the PCM voltage down but not blow the fuse?
as a "what the hell" I would unplug the fuel bowl heater just to see if there was any change.
Freshman User
Joined: Mar 2011
Posts: 46
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From: El Dorado, AR
This may sound bizarre, but you might try to find a local ham radio club. I may be able to help with that if you need. It really sounds like you have an RFI problem, and those guys are typically pretty good at sniffing those out. Let me know if I can help with finding you someone.
Senior User
Joined: May 2011
Posts: 454
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From: Portland, OR
I don't know anything about RF shielding, but the HAM guys might. Wonder if there's something you can try wrapping the IDM/PCM in just to try. It sure does sound like RF interference.
Like those tin foil hats the UFO conspiracy guys wear...
Like those tin foil hats the UFO conspiracy guys wear...
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Freshman User
Joined: Mar 2011
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From: El Dorado, AR
Ha ha ha! I don't know about tin foil hats. May be a possibility. The other thing is if he's having trouble near one particular tower, there may be a transmitter problem at that tower. The guys that maintain the club repeaters are usually very good at ferreting out interference issues. I may be way off base, but it sure smells like RFI from here. RES86, I'll review the previous posts for your location and see if I can find a nearby club if you're interested.
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I'll try the heater element, but last I looked it was all good. The thing that tells me that it isn't that would be that it is so intermittent yet expected in said places. RF is what I'm thinking as well, it almost seems like it has to be. Just seems weird that my truck is the only one that I have seen have this issue there. Vermilion is quite the haul, getting Horse S*** mileage right now too. Running with the ICP unplugged, getting around 165 miles to 3/4 tank. I drive with it plugged in anytime I'm on the east side of town and really don't have any issues.
Another issue I think I forgot to mention: When this all started I found that everytime I stood on the bumper/brushguard to look in the engine compartment, it would run fine. Thought bad ground/wire instantly. Couldn't find one. Is there one back there I may have missed?
Another issue I think I forgot to mention: When this all started I found that everytime I stood on the bumper/brushguard to look in the engine compartment, it would run fine. Thought bad ground/wire instantly. Couldn't find one. Is there one back there I may have missed?
Senior User
Joined: May 2011
Posts: 454
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From: Portland, OR
Yeah, I know it's not ideal (Vermillion), just thought I'd throw it out there anyways in case you were headed that way for any reason.
You could fork over the dough for AE yourself. I did a while back and it's paid for itself many many times over already. About $350 or so, just FYI.
Yeah, that is come crap mileage. Dang. Thinking with your radio towers and the lack of variety with occurences plus others having RF trouble with things as benign as headlights, pretty suspicious, but can't say I've ever heard of it before.
You could fork over the dough for AE yourself. I did a while back and it's paid for itself many many times over already. About $350 or so, just FYI.
Yeah, that is come crap mileage. Dang. Thinking with your radio towers and the lack of variety with occurences plus others having RF trouble with things as benign as headlights, pretty suspicious, but can't say I've ever heard of it before.
Laughing Gas
Joined: Aug 2012
Posts: 915
Likes: 3
From: Palatka, FL
I have read that the Exhaust Back Pressure Sensor mounted on the front of the engine can go bad and cause this also but not at a particular location. Research increasing MPG 7.3L on youtube. There is a video that shows you how to clean out the EBP Sensor tube. You may very well have a bad sensor.
