migueldosantos77 Posted February 24, 2024 Share Posted February 24, 2024 Hello everyone. I have been attempting to address an intermittent problem with the fbh, where it sometimes activates and other times does not. ACM-Audio System Error code U0166-00 indicates a loss of communication with the auxiliary heating control module. AHCM stands for Auxilary Heater Control Module. Code B1D31-94 indicates that a flame was detected before the system started operating normally due to a component failure leading to unexpected operation. While experimenting, I saw diesel leaking from the exhaust on the FBH where the exhaust port connects to the concertina exhaust pipe and trickling onto the inner wing. Has anybody else seen this issue, and is there a solution available? I presume the lack of leakage occurs while the heater is priming, since there are no leaks when it is operational. Thank you Quote Link to comment Share on other sites More sharing options...
motorman3 Posted February 24, 2024 Share Posted February 24, 2024 The fuel is leaking due to a failed ignition, causing unburnt fuel to accumulate and drip. Cheers Quote Link to comment Share on other sites More sharing options...
migueldosantos77 Posted February 24, 2024 Author Share Posted February 24, 2024 Thank you, that clarifies the situation. Thank you Quote Link to comment Share on other sites More sharing options...
diablos_carcv5 Posted February 24, 2024 Share Posted February 24, 2024 I had the same problem, however in my case, the heater would produce a significant amount of smoke due to frequent ignition. I discovered that the ceramic insulator containing the glow plug at the top of the burner core was damaged and disintegrated when I dismantled it. Quote Link to comment Share on other sites More sharing options...
migueldosantos77 Posted February 24, 2024 Author Share Posted February 24, 2024 Today, I disassembled, cleaned, and reassembled my fuel bowl heater. Fortunately, the pottery remained unbroken. It leaked while attempting to start it after the repair, although it had the same issue before it was taken out. Thank you very much Quote Link to comment Share on other sites More sharing options...
motorman3 Posted February 24, 2024 Share Posted February 24, 2024 The coding suggests a potential issue with the flame detector/sensor component of the glow plug, however this is only a speculation and not a confirmed diagnosis. Quote Link to comment Share on other sites More sharing options...
migueldosantos77 Posted February 24, 2024 Author Share Posted February 24, 2024 After the strip down and clean up over the weekend, the fbh has been functioning perfectly with little smoke for the last several days, which is an improvement from previously. To determine the source of the metallic scraping noise as I accelerate, it seems like something is grinding on either a brake shield or one of the metal coverings below the vehicle. It might also be due to a loose rear prop centre bearing. Thank you Quote Link to comment Share on other sites More sharing options...
motorman3 Posted February 24, 2024 Share Posted February 24, 2024 Ensure there is no stone stuck between the backplate and disc before becoming very enthused about the situation. Quote Link to comment Share on other sites More sharing options...
migueldosantos77 Posted February 24, 2024 Author Share Posted February 24, 2024 Sure, I will. It occurs inconsistently. Years ago, I had a situation when a stone became lodged between a calliper and a disc on a different automobile, causing a loud squealing noise. Thank you very much Quote Link to comment Share on other sites More sharing options...
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