If you do it's probably working ok - but not always. If you get materially less than the published figure odds are high the sensor is bad. Most engines have a maximum published airflow one way to test the MAF is to run a log at WOT all the way to redline on flat ground at or near sea level and see if you get a reported value at or very near that amount. The only way to know what it's actually returning is to look at the PCM data, which in most cases is visible using something like Torque via the OBD port. If you like buying MAFs then aftermarket intakes and air filters are a good thing to put on your car, in other words.īTW many if not most modern vehicles have digital MAF outputs you cannot check them with a voltmeter as they return a digital signal. MAFs generally do not go bad PROVIDED your air filtration is up to snuff the hot film ones, however, are quite-easily damaged by any sort of particulate or (much worse!) oil contamination. You can get an "implausible" code in some cases but a good percentage of the time you just get crappier performance and often crap fuel economy without any other warning. In many cases a bad MAF will not throw a code since it's quite difficult for the ECU to know that the reported value indicates a problem with the sensor. Now the MAF, on the other hand, can very easily cause all sorts of trouble, and chief among them is poor throttle response and bad fuel economy, because it's what tells the ECU how much air is going into the engine and thus how much fuel SHOULD be injected (by its maps), which is then "confirmed" by the O2 sensor on the other end that you actually burned what went in (the oxygen was consumed.) All it does is throttle the air it's not involved in fueling or metering anything, other than the air. Love it, and will only buy Mazda's now.Cleaning the TB is a waste of time if your air filter works at all. You'd think it would be a total junk bucket, but it's just a great, solid vehicle. I have neglected this car as much as any one could, and it in turn has been perfectly reliable and fully functional for eleven years (except the air conditioner, which I never tried to fix since that would involve money). My goal with an automobile is to spend as little time and money on it as possible. Seats are reasonable comfortable I guess. It's no luxury car: simple interior, pretty high amount of road noise. Upholstery doesn't show much wear at all. No broken knobs or switches, no cracks on the dash or interior except where I've been putting my elbow on the drivers side arm rest for a decade. Electric windows, dash lights, head/tail/blinkers, fans etc - all work. Has held up to inconsiderate use/abuse extremely well. It is 60,000 miles overdue on its 60,000 mile route maintenance, and just doesn't stop. I change the oil twice a year with the cheapest oil they sell. I do absolutely nothing to maintain this car, and it just goes. Recently made it from Las Vegas to Tucson AZ on one tank of gas (42 mpg, honest. Over ten years I averaged at least 30 (up to 32) mpg city, and maybe 35 on highway. Literally years go by without me spending a cent on auto repair other than oil changes.Įxcellent gas mileage. The air conditioning stopped working about 4 years ago, I've made no attempt to repair.
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