Testing a MAF with OHM / Volt meter?
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Testing a MAF with OHM / Volt meter?
Does anyone know how to test the MAF on a 2005 escape 2.5l? I have scoured the net and can't find anything for this model.
i have a p0171 code, and think that it may be the maf. The fuel trim is negative at most speeds.
i have a p0171 code, and think that it may be the maf. The fuel trim is negative at most speeds.
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Joined: Feb 2002
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From: Warren, MI
That's a lean code, look for a vacuum leak. Introduce a large vacuum leak, it goes lean. Introduce some propane into the intake, it goes rich.
Shouldn't your fuel trim be going the opposite way or positive for a lean code?
Shouldn't your fuel trim be going the opposite way or positive for a lean code?
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I tried spraying propane and starter fluid around and couldnt find anything. The code doesn't always come up right away, sometimes it may last 600 to 1200 miles without a code. It never runs rough, even when the code is on, the throttle response is just a little unresponsive
Thats why I was thinking maf.
Thats why I was thinking maf.
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checked the MAF using the scan tool.
At idle 3 g/s and increases as throttle is applied, this seems normal from everything I have read. I guess this eliminates the MAF.
another Idea I have is Maybe the brake booster is leaking air into the system, it is connected to the intake tube downstream of the maf sensor. I guess I could try to cork that off for a week and see what comes about.
just for kicks here is some of the data i recorded at idle
intake pressure 4.5psi
fuel trim idle -4 to 6%
fuel trim long term 12.5%
fuel pressure 38.17 psi
fuel flow .21 GaL / HR
Evap sys pressure -25.75 pa
At idle 3 g/s and increases as throttle is applied, this seems normal from everything I have read. I guess this eliminates the MAF.
another Idea I have is Maybe the brake booster is leaking air into the system, it is connected to the intake tube downstream of the maf sensor. I guess I could try to cork that off for a week and see what comes about.
just for kicks here is some of the data i recorded at idle
intake pressure 4.5psi
fuel trim idle -4 to 6%
fuel trim long term 12.5%
fuel pressure 38.17 psi
fuel flow .21 GaL / HR
Evap sys pressure -25.75 pa
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