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  #31  
Old 04-04-2019, 09:14 PM
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I replaced the FICM once on this truck about 4 years ago after the truck started behaving inconsistently in that it would run as if some injectors were missing and sometimes hard start. I was trouble shooting bad injectors by using my non-contact thermal gun and had good luck using that method up until that point. Had a shop with a good scanner look at it and they initially said they thought it was a wiring issue and then did a quick FICM swap that did fix the problem. It was one of the few times in the last 20+ years that have had a shop work on one of our vehicles and I felt like I really should have known better and swore not to fall for that again. I could have bought a scanner for myself for the charge and I had to go back and have them put bolts in the degass bottle as it was just floating on top of the motor with no bolts holding it.
The way this starts up cold and runs fine for a short while and then starts romping at a high idle sometimes falling back to 900 then back to 1100 or so just reminds me of how flaky the FICM effected the injectors and the engine performance. Just wondering if anyone has had similar experiences with a PCM and if there are any fixes. I have heard that FICMs can be repaired by re-soldering the components and I am wondering if anyone has experience with the PCMs. I am seriously thinking I need to tear into mine and see what I find. I got a new ICP Original 03-04 style but haven't replaced it yet as I have a 05 style coming and since it is not the easiest to get to I thought I would just do the new style. I really don't have a lot faith that the ICP is going to do much more than the IAT#2 (MAT) sensor. The common denominator looks to me to be the PCM as they (IPR, MAT and ICP) all report to the PCM. I see a used 06 PCM for a reasonable price and am wondering if that would even work or have there been some change like the pin out or configuration, operational voltage, communication protocol to the FICM or something else I am not thinking about.
  #32  
Old 04-05-2019, 10:21 AM
Zeb Zeb is online now
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Quote:
Originally Posted by Long Gone View Post
I replaced the FICM once on this truck about 4 years ago after the truck started behaving inconsistently in that it would run as if some injectors were missing and sometimes hard start. I was trouble shooting bad injectors by using my non-contact thermal gun and had good luck using that method up until that point. Had a shop with a good scanner look at it and they initially said they thought it was a wiring issue and then did a quick FICM swap that did fix the problem. It was one of the few times in the last 20+ years that have had a shop work on one of our vehicles and I felt like I really should have known better and swore not to fall for that again. I could have bought a scanner for myself for the charge and I had to go back and have them put bolts in the degass bottle as it was just floating on top of the motor with no bolts holding it.
The way this starts up cold and runs fine for a short while and then starts romping at a high idle sometimes falling back to 900 then back to 1100 or so just reminds me of how flaky the FICM effected the injectors and the engine performance. Just wondering if anyone has had similar experiences with a PCM and if there are any fixes. I have heard that FICMs can be repaired by re-soldering the components and I am wondering if anyone has experience with the PCMs. I am seriously thinking I need to tear into mine and see what I find. I got a new ICP Original 03-04 style but haven't replaced it yet as I have a 05 style coming and since it is not the easiest to get to I thought I would just do the new style. I really don't have a lot faith that the ICP is going to do much more than the IAT#2 (MAT) sensor. The common denominator looks to me to be the PCM as they (IPR, MAT and ICP) all report to the PCM. I see a used 06 PCM for a reasonable price and am wondering if that would even work or have there been some change like the pin out or configuration, operational voltage, communication protocol to the FICM or something else I am not thinking about.
I seriously doubt it is the PCM. It most likely is the wiring harness, or sensor(s).
  #33  
Old 04-05-2019, 10:59 AM
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Thanks Zeb. That is encouraging. It may be a while until I can get to it as we just got news that the expected granddaughter is arriving and we are going to have to head there to meet her. It's only 700 or so miles so everything should be here when we get back. Thanks again.
  #34  
Old 04-05-2019, 11:20 AM
Zeb Zeb is online now
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Originally Posted by Long Gone View Post
Thanks Zeb. That is encouraging. It may be a while until I can get to it as we just got news that the expected granddaughter is arriving and we are going to have to head there to meet her. It's only 700 or so miles so everything should be here when we get back. Thanks again.
Best wishes on the grand daughter!!!
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