WebJan 1, 2024 · Short-term fuel trim (STFT) is the product of the feedback from the oxygen sensors. This is the real-time correction to the fuel injector pulse width that is commanded by the ECM. The long-term fuel trim (LTFT) is the accumulated data from the short-term trims. This is the historical record from the O2 sensor feedback. WebJan 22, 2009 · NOTE: The MAF sensor must be connected to its connector to perform this test. These are the test steps: 1. With the Key in the OFF position, place your multimeter in Hertz (Hz) mode. If you need to buy a Hertz enabled multimeter or need to upgrade to one, check out my recommendations here: Buying A Hertz Digital Multimeter for Automotive ...
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WebFeb 15, 2015 · Join Date Jan 2015 Location Lincoln, NE Posts 513 Thanks (Received) 0 Likes (Received) 0 Dislikes (Received) 0 Chats 470 WebApr 13, 2008 · RPM): increases with speed up to about 225mV. Diagnostic reads .24 lb/min for MAF and 0 for MAF voltage. Connected up the AutoTap, While running, disconnected MAF connector and feed power into connector signal leads via AA batteries. 1.5 V (1XAA) feed, OBD-II reported MAF V=1.2, MAF Rate - small change (~0.3lb.min) cstring removeat
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WebI had a 2001 Pontiac Grand Prix GTP, but blew the motor on it. I had it replaced with a newer motor with no supercharger (still a 3800 ... Lately its been idling rough (below 1000 RPM), and I also hear a hissing noise near the MAF sensor. ... 1.95 roller rockers, headers, gen 5 N* 3.0 pulley, FSIC, 42 lb injectors, a BrandonHall rebuilt trans ... WebOct 9, 2024 · Checking MAF sensor data using generic OBD data. Note: The idle airflow/engine displacement correlation is an imprecise, rule-of-thumb measurement that can vary by vehicle. Some automakers include the MAF sensor specifications in the factory repair information. It’s a good idea to consult a repair manual or repair database for this … WebSep 2, 2024 · MAF sensors typically either provide a frequency signal or a voltage signal, depending on the design. Some Asian vehicles use a sonic type MAF sensor where there is a tiny speaker that sends a high frequency sonic signal to a receiver on the opposite side of the airflow passage, and the deflection of the sound provides input to the ECM/PCM ... early lupus signs and symptoms disease