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MAF sensor test- I need to know if is good or bad

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Old 04-05-2019, 04:04 PM
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That was three days ago.
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Old 04-05-2019, 04:19 PM
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Originally Posted by edbc
That was three days ago.
They look pretty good, but very noisy. So the +23% doesn't really matter anymore.

white89GT might be on the right track with the MAF sensor. If the MAFS signal is noisy the trims will be noisy in response. Electrical noise, maybe from bad connections.
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Old 04-05-2019, 04:27 PM
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Originally Posted by BareBonesXL
They look pretty good, but very noisy. So the +23% doesn't really matter anymore.

white89GT might be on the right track with the MAF sensor. If the MAFS signal is noisy the trims will be noisy in response. Electrical noise, maybe from bad connections.
I don’t know how to check another way? Any site? Or just instructions how to check correct?
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Old 04-05-2019, 04:32 PM
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Originally Posted by edbc
Number 1-MAF signal I got- on idle from 0.9 to 1. Volt-on 1500rpm I got 1.18V and 2500rpm I got 1.58V
What does it read with the key on, engine not running? Didn't you already change the MAFS anyway? Did you install a new one or a used one?

Alright, I'm out of ideas...

Originally Posted by edbc
Hello guys I’m still alive with my famous F150 4.6. I’m crazy I changed MAF and stil same issue. I running around and I don’t what to do. I put $$$$ in this and still same. What I notice better sart and driving when is sunny day and hot
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Old 04-05-2019, 04:43 PM
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Originally Posted by BareBonesXL
What does it read with the key on, engine not running? Didn't you already change the MAFS anyway? Did you install a new one or a used one?

Alright, I'm out of ideas...
I still have old one But I install a used one


Edit: I got signal at idle from 0.9 to 1. Volt-on 1500rpm I got 1.18V and 2500rpm I got 1.58V- with engine running
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Old 04-05-2019, 04:49 PM
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Engine not running. Key on.


Alrighty, here's another guess - is the transmission downshifting when you press the accelerator? You should hear the engine RPM increase and get more power as a result of higher RPM. If you get stuck in high gear it will feel like you have no power. It will also knock and rattle from detonation.
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Old 04-05-2019, 04:54 PM
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Originally Posted by BareBonesXL
Engine not running. Key on.


Alrighty, here's another guess - is the transmission downshifting when you press the accelerator? You should hear the engine RPM increase and get more power as a result of higher RPM. If you get stuck in high gear it will feel like you have no power. It will also knock and rattle from detonation.
Honestly tranny shifting like crazy and I got Rpm but no power no acceleration. If I press gas pedal really fast. But getting slowly speed. Up to hill is really bad 2500rpm or more driving top 60kh
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Old 04-05-2019, 04:56 PM
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Originally Posted by edbc
Honestly tranny shifting like crazy and I got Rpm but no power no acceleration. If I press gas pedal really fast. But getting slowly speed.
Might be that you actually have a bad transmission.
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Old 04-05-2019, 05:02 PM
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Originally Posted by BareBonesXL
Might be that you actually have a bad transmission.
Transmission rebuilding 5 months ago. I was thinking is tranny. Now is really smooth shifting
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Old 04-05-2019, 05:08 PM
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Originally Posted by edbc
Honestly tranny shifting like crazy and I got Rpm but no power no acceleration. If I press gas pedal really fast. But getting slowly speed. Up to hill is really bad 2500rpm or more driving top 60kh
If you have RPM and good trans then the truck will go. Something wrong with your descriptions. Torque converter might be bad.
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