Bad MAF sensor

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Apr 9, 2020 | 09:49 AM

#31

rla2005

Fleet Owner

Joined: Oct 2005

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From: Kentucky

Quote:

Originally Posted by Blurry94

Is there any way you can borrow/rent a scan tool that will display live engine data?

I have been thinking the same thing....

A cheap ELM327 based OBD-II reader and FORScan or Torque app to read live data.

Apr 9, 2020 | 09:57 AM

#32

Thejackalope

Thread Starter

Mountain Pass

Joined: May 2019

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I have torque pro. What live data should I be looking at?

Apr 9, 2020 | 11:18 AM

#33

rla2005

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Joined: Oct 2005

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From: Kentucky

TPS, ECT, ACT/IAT values. Might as well throw in the MAF feedback value as well. Not sure if this early OBD-II system has pending codes?

Apr 9, 2020 | 12:36 PM

#34

Thejackalope

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Mountain Pass

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TPS is 20% at idle and responds with pedal. Coolant temp and intake air temp both fine. Can not get a MAF reading as it does not run with it plugged in and air flowing through it. Only code I have is P0102 due to MAF unplugged.

Apr 9, 2020 | 12:59 PM

#35

rla2005

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From: Kentucky

20% would be ~1 V so that's good. If the ECT and IAT/ACT are good, by your own statement, I would really start to suspect a bad computer. Unplug the SPOUT, plug the MAF back in, then see if the engine runs. I would think there is a PID to monitor ignition timing/advance?

Apr 9, 2020 | 01:02 PM

#36

Thejackalope

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Mountain Pass

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Timing is good also. Could see it advance/retard. Where is the spout located at?

Apr 9, 2020 | 01:14 PM

#37

Thejackalope

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Mountain Pass

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Quote:

Originally Posted by rla2005

I found the spout thanks to one of your older posts. Disconnected it and plugged in MAF. Same result. Starts, sputters, then dies. The computer is less than 3 years old but I guess it could be bad.

Apr 9, 2020 | 01:22 PM

#38

rla2005

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Joined: Oct 2005

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From: Kentucky

I do not want to spend anyone's money, but to me it is starting to point that direction. Hopefully some other minds will chime in.

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Apr 9, 2020 | 01:37 PM

#39

Thejackalope

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Mountain Pass

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If it had done this a few months ago I would have just dumped the thing. Now that I replaced just about everything on this truck I have too much into it to just get rid of it. Won't get much if it doesn't run.

Apr 9, 2020 | 04:01 PM

#40

torq'ta 5 8

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Joined: Jan 2019

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From: N.W. Alabama

you could remove PCM and open it, to see if anything looks suspicious, before buying, crashtestdummy is offering to test and fix PCM's for free, might be another alternative, before buying
FTE member offering free ECM repair - Ford Truck Enthusiasts Forums

Apr 9, 2020 | 04:26 PM

#41

Thejackalope

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Mountain Pass

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Quote:

Originally Posted by torq'ta 5 8

I guess its worth a shot. It would be nice if it was in an easier spot to remove it though. What was Ford thinking with that location?

Apr 9, 2020 | 04:56 PM

#42

torq'ta 5 8

Lead Driver

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From: N.W. Alabama

couldn't have, because the earlier yrs, come out from inside cab, what a novel idea, they had to think 'well thats too dam easy' we have to fix that!

Apr 9, 2020 | 08:48 PM

#43

Blurry94

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Joined: Jun 2003

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From: Calhoun GA

This being a MAF motor, i would put a vacuum gauge on it while it is idling. Another thing, does it behave any different when the motor is cold vs when it's up to temp?

Apr 10, 2020 | 03:50 PM

#44

Thejackalope

Thread Starter

Mountain Pass

Joined: May 2019

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Quote:

Originally Posted by Blurry94

This being a MAF motor, i would put a vacuum gauge on it while it is idling. Another thing, does it behave any different when the motor is cold vs when it's up to temp?

According to the scanner, vacuum is fine. Engine temp change has no effect.