![]() ![]() To adjust the spring tension you have to press the lock tab against the housing and use a small pick or screwdriver to rotate the gear. So now that you know the basics here is how it works, pictures say a thousand words: before doing a damn thing mark where your lock points to on the gear so you can reverse any screw ups you may do. The air flow meter is the heart of the fuel injection system on these cars and the meter is very finely calibrated, only a few clicks on the clock spring can have adverse effects on how much fuel the engine gets.įor some vehicles you can bandaid a lack of fuel by richening up the mixture by loosening the clock spring BUT your air flow meter will max out sooner, fortunately the turbo airflow meters max out at about just over 350 wheel horsepower!(factory calibration) the stock cars only used half the sweep of the meter.ġst you need a razor blade to cut the sealant on the black plastic cover then pop it off. if you loosen the spring tension the door moves more freely and the mixtures are richer, tighten the spring and the door has more resistance and take more effort to open meaning leaner mixtures. the reason is the door uses the clock spring as a defining factor for how much resistance the flapper door needs to open. While playing with the clock spring i noticed you can in effect tweak the response of the airflow meter to lean it out or richen up your mixtures throughout the RPM ranges, rather easily in fact. one the clock spring had been tweaked and the car was running severely lean, 2 the solder joints were all broken so i knew someone was dicking with it. While running into an issue with a customer's car the engine kept stalling out, i noticed the air flow meter black cover was not sealed to the case, i popped the cover off and noticed a few things. Before ripping your AFM off your car and following this procedure this is for experienced tuners, i will not be held responsible for anyone blowing their engines due to improper modifications or not following the procedure accurately.
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