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Thank you for the response!
I blocked the preheat hose flap after the first replacement flap failed.
Over the years I have been through all the air, fuel and electrical systems more than once.
I had sever running problems some years ago and although the AMM Ohms checked out within spec it wasn't until I swapped it out with an AMM from a salvage yard that the major issue stopped.
I was wondering if the AMM cleaner would put that original malfunctioning AMM back into service for a back-up.
I was also wondering if cleaning the AMM would have a beneficial impact on my poor gas mileage. My mileage fluctuates from 15 to 20 mpg in city driving, running sole and unloaded.
In regard to the mileage, the only thing I have not done is replace the O2 sensor after the above mentioned sever running issue. So it could be fouled ... but that does not strike me a contributing to 'fluctuating' mileage.
Then again ... I did just replace a failed in-tank fuel pre-pump. Maybe it has been suffering all the time I have been trying to figure the fluctuating mpg. That pre-pump has not been installed long enough for me to check gas mileage.
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1988 244 DL; B230F; LH-2.2; Manual 5-speed (M47)
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