[Supras] Failed AFM?

[Michael Green]

Yes, K&N FIPK. I have some residue on the honeycomb screen, perhaps that is 
the issue.
So.... top rack of the dishwasher, next to the tupperware, is not the 
recomended cleaning method?
Sounds like replacement is the only option.
Thank you for the information.

Mike Green





>From: "Walker, Brian1 (Rich. Dist)" <Brian.Walker2 at VDOT.Virginia.gov>
>To: <mikejaygreen at hotmail.com>,<supras at supras.com>
>Subject: RE: Failed AFM?
>Date: Tue, 20 Feb 2007 10:31:32 -0500
>
>Mike, are you by chance using an oil type air filter? (K&N or similar) I've 
>had similar problems that appeared to be cause by buildup on the AFM sensor 
>over time. I have also heard others mention the same problem. Historically 
>there has not been a method (AFAIK) to clean the very sensitive mirror in 
>the AFM sensor. I have seen a MAF cleaner advertised in some magazines that 
>may work (CRC Is the manufacturer,   
><http://www.crcindustries.com/auto/content/products.aspx> 
>http://www.crcindustries.com/auto/content/products.aspx) but I have not 
>seen this in the store to try it. We had tried different agents that we 
>'thought' would leave no residue but still the sensor failed and triggered 
>code 31.
>
>Hope this helps,
>Brian W-88T
>
>Date: Sun, 18 Feb 2007 12:41:35 -0800
>From: "Michael Green" <>
>Subject: [Supras]
>To: supras at supras.com
>Message-ID: <BAY123-F20E4172B41C75FDC14C747CC8B0 at phx.gbl>
>Content-Type: text/plain; format=flowed
>
>Recently a problem with the Supra occurred, which I would appreciate 
>opinions from list members on.
>At engine idle, air fuel ratio will become increasingly rich. Per the wide 
>band, it will increase from 14.5 to 1 to over 9 to 1. Anything more than 9 
>to 1 and my wideband will display "RICH".
>
>Code 31 is persistent (AFM signal) and returns after pulling the EFI fuse.
>No other codes occur.
>I have checked wiring from AFM to ECU, continuity is good. Voltage checks 
>at ECU wiring terminals are within normal values, per TSRM, except the KS 
>(air flow meter) voltage.
>
>Per the TSRM, the voltage at KS with ignition switch on, should be between 
>4 to 6 volts. I have 5.18 volts. However, with the engine running, the KS 
>voltage should be 2 to 4 volts. My voltage remains at 5.18 volts. The 
>voltage does not drop until the engine RPM reaches 2500, then it will 
>bounce between 2 and 3 volts and the A/F ratio will drop to 14.5 to 1.
>
>If I slowly reduce RPM from 2500 to idle, the A/F ratio will bounce back 
>and forth between rich and lean. KS voltage is bouncing from around 3 volts 
>to a bit over 5 during this RPM drop.
>
>Resistance for the water temp sensor and injector cold start time switch 
>are normal, per TSRM.
>At this point, I decided to take a break and ask the list for help. Does 
>this sound like an issue with the AFM?
>Input requested. Thank you,
>
>Mike Green
>
>
>
>

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