MAF sensor test- I need to know if is good or bad
02-28-2019, 09:41 PM
#1
Senior Member
Thread Starter
MAF sensor test- I need to know if is good or bad
Hello guys
I checked and changed many things on my truck 97 F150 4.6 V8 with 320k. Now I have a question. Is my MAF sensor good or bad? I checked MAF:
Number 4 -12 Volts I got 12V,
Number 3-ground I got 12V,
Number 2-ground that the ECM provides I got 12V,
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
I would like to know is this MAF sensor good or bad? I already have almost all symptoms for bad MAF. Lack of power upon acceleration ,little rough idle ,bad gas mileage ,lean fuel trim +23 on acceleration (shop scan this) but I don’t have a CEL on
Thx
I checked and changed many things on my truck 97 F150 4.6 V8 with 320k. Now I have a question. Is my MAF sensor good or bad? I checked MAF:
Number 4 -12 Volts I got 12V,
Number 3-ground I got 12V,
Number 2-ground that the ECM provides I got 12V,
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
I would like to know is this MAF sensor good or bad? I already have almost all symptoms for bad MAF. Lack of power upon acceleration ,little rough idle ,bad gas mileage ,lean fuel trim +23 on acceleration (shop scan this) but I don’t have a CEL on
Thx
Last edited by edbc; 02-28-2019 at 10:11 PM.
02-28-2019, 10:56 PM
#2
Senior Member
Does the engine idle high before stalling ?
If not your MAF is fine.
If not your MAF is fine.
Last edited by Jbrew; 02-28-2019 at 10:58 PM.
02-28-2019, 11:04 PM
#4
Senior Member
Need a new one then.
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edbc (02-28-2019)
02-28-2019, 11:09 PM
#5
Senior Member
Thread Starter
That can be a lean fuel Trim? They respond so hard and first start is really hard sometimes I need to crank a two time specially in cold weather
03-01-2019, 02:49 PM
#7
Senior Member
Cold start issues can be quite a few things. The only dead giveaway for a MAF prob is high rpms then stall.
You run some drive cycle signal tests, engine dependent...I believe this is what you use as far numbers, -
http://www.fordscorpio.co.uk/mafdata.htm
You run some drive cycle signal tests, engine dependent...I believe this is what you use as far numbers, -
http://www.fordscorpio.co.uk/mafdata.htm
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03-01-2019, 03:08 PM
#8
Now an XLT in Colorado
Improper cleaning materials and/or techniques can damage the sensor wire. It's easy to do, because they're pretty fragile.
If you have trouble locating one, let me know by PM. I believe I still have one here I was going to throw up on eBay.
..
If you have trouble locating one, let me know by PM. I believe I still have one here I was going to throw up on eBay.
..
03-01-2019, 04:20 PM
#9
Senior Member
Thread Starter
OhioLariat
i need for 97 f150. They’re different is not same year. On my fit from 97-98
Jbrew i use this site and follow instructions:
https://easyautodiagnostics.com/ford...sensor-tests-2
i need for 97 f150. They’re different is not same year. On my fit from 97-98
Jbrew i use this site and follow instructions:
https://easyautodiagnostics.com/ford...sensor-tests-2
03-01-2019, 04:25 PM
#10
Now an XLT in Colorado
OhioLariat
i need for 97 f150. They’re different is not same year. On my fit from 97-98
Jbrew i use this site and follow instructions:
https://easyautodiagnostics.com/ford...sensor-tests-2
i need for 97 f150. They’re different is not same year. On my fit from 97-98
Jbrew i use this site and follow instructions:
https://easyautodiagnostics.com/ford...sensor-tests-2