I have been doing alot of reading and troubleshooting on this darn truck and I may swap the FICM with a different truck to see if the problem continues. According to my studies, the FICM should be shielded.

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No change with the other FICM. Back to square whatever!

 

I found this post through google. I am having the EXACT same problem on a customers truck. This radio is installed in the vehicle so we tried new radio, power supply and antenna to fix the problem. None fixed it so it has to be an RF problem. We even tried a handheld in the truck and it also causes it to do the same thing.

They think it started after changing the HPOP. Please hosmanr1, keep me updated if you find the problem and I will do the same.

 

Glad to see that I'm not alone here. Although I wish I had the answer. I didnt replace the HPOP however i did replace the IPR and ICP within the last year. I also replaced the injector wire harness because of one bad connector. The ICP and IPR are after markets and I'm getting to wonder if maybe they arent shielded like OEM. I'm grasping right now. I will keep you posted as well DMAX.

 

I am going to talk to their mechanic and see if they changed anything else. Perhaps there will be a common thread.

 

By the way, the strange part of all this is that I am not getting any codes stored or otherwise nor is the CEL coming on. I would think that if i am creating a loss of signal to one of the sensor or computer that it would at least store a code.

 

It wouldn't be hard to watch those parameters with a scanner and then duplicate the problem and see if they change at all.... monitor ICP actual, ICP desired, and IPR duty cycle.

 

I monitored the data using our scanner however I don't think it reads IPR duty cycles. I didnt see that one on the data screen. Nothing seemed to have changed while keying the mike as far as the scanner is concerned. Sometimes RPM's just increase, sometimes the engine chugs and picks back up and other times it just flat out dies.

 

Still trying to figure this one out. According to Ford Motor Company Customer Relationship Center, there are no sensors, relays switches etc . . . that would be affected and cause the truck to die while keying the radio. Ok then, according to them I do not have a problem. So anyway, I am trying to brainstorm as to which sensor could indirectly cause my RPM's to sometimes increase and/or kill the engine by the radio. Only two that came to mind was the crank and camshaft sensor. I started with the easy one first, the camshaft sensor. I pulled it out and I not only have two bad "O" rings but the magnetic tip is very carboned up. Also, not sure if this is normal but you can twist the magnetic tip around as well. I'm just going to throw a new one on it and see if that helps.

 

Ok, so I figured it out. I was watching the readings on my scanner and trying to see what would change as I keyed the mike and the only thing that was odd to me was the ICP. The desired would stay the same at idle however the actual would go up quite abit. I replaced the ICP about a month ago with a cheap after market one but I only replaced it because my voltage reading was .16 whereas the min should be .18. Anyway, I put the old one back on and no more problems. Apparently the cheap 130.00 after market one is not shielded like the OEM ones. I guess this normally wouldn't be a problem unless you use a two way radio.

 

You have an rf frequency problem. . The hood struts are plastic on each end and the hinges do not ground very good .This has worked before. Make sure all battery connects are very clean and body grounds are good . Take a 14 gauge wire go from battery - to the under side of hood and attach with sheet metal screw. This will form the hood into a faraday shield .Hope this helps.