mass airflow sensor question. - Ranger-Forums - The Ultimate Ford Ranger Resource
Ford Ranger Forum - Forums for Ford Ranger enthusiast!

Go Back   Ranger-Forums - The Ultimate Ford Ranger Resource Arrow Ranger-Forums Technical Engine Forum Arrow 4.0L OHV & SOHC V6 Tech

4.0L OHV & SOHC V6 Tech General discussion of 4.0L OHV and SOHC V6 Ford Ranger engines.

LinkBack Thread Tools Search this Thread
Old 11-07-2014
Thread Starter

I am: jamie
Join Date: Aug 2014
Location: greensboro, nc
Vehicle: 1994 ranger
Drive Type: 4x2
Engine: 4.0
Posts: 2
Total Props: 0
mass airflow sensor question.

I went to get in my 94 ranger 4.0 4x2 today and the truck ran really rough and wouldn't run well enough to go anywhere. If felt like it was starting out in a high gear (I have a manual). I opened the hood and checked plugs, wires, ect and everything seemed OK. I switched out the fuel filter because I had been meaning to do it anyways. While idling, it would stall out after a couple of minutes.

I ran my code reader and got code 159 which relates to the mass airflow sensor being out of range. This summer, I replaced the mass airflow sensor to get rid of a check engine light. I read on the internet that if you unplug the MAS, the engine should stall. Mine doesn't. I'm wondering what peoples thoughts are on this. Should I try cleaning it (best method?), or would you take it apart and return the part. I believe the part should still be under warranty at AutoZone. If anybody has ideas or comments, it would be welcome.
Reply With Quote
+ 0 -
Old 11-07-2014
Dewey's Avatar

iTrader: (6)
I am: Jacob Dewey
Join Date: Feb 2013
Location: Arcadia, Fl
Vehicle: 2005 Edge
Drive Type: 4x2
Engine: 3.0
Posts: 1,742
Total Props: 30
if you unplug it, one of two things will happen. The engine stalls, or it runs better if not the same. If it stalls, the sensor is good. If it runs the same or better, double check your wiring and then return it. If you got a reman- it has a 1yr warranty, if new, Lifetime Warranty. Double check if its in stock first though. Most stores will order it in ahead of time if you let them know you are going to return it that way you have a lot less down time since it typically takes at least 2 days and ordering it tomorrow would mean you get it Tuesday at the soonest.

2005 E4 EDGE 182CI of FURY!
35x12.50 Toyo R/T's, 18x10 Fuel Throttles, 4.88 Yukon gears, Eaton TrueTrac L/S, Cobra 12" Disc Swap, Bastard Leafs, 2" Shackles, Lift Spindles, Bilsteins, Traction Bars, Flowmaster Delta 50 Series, 250AMP alt., +06 Facelift, Custom Grille, HIDs, Escape Leather Buckets, Pioneer System
Interested in Official R-F decals? Click Here!

IG @The_Almighty_E4_Ranger
Reply With Quote
+ 0 -
Old 11-08-2014
iTrader: (1)
I am: Ron Dean
Join Date: Jan 2014
Location: Vancouver, BC
Vehicle: 1994 Ford Ranger
Drive Type: 4x4
Engine: 4.0
Posts: 4,739
Total Props: 88
Engine might stall, it depends on computer software and timing.
The computer may think engine is being shut off when MAF data stops, so cuts fuel and spark, but most computers recover in time and engine will stay running.
In any case just restart engine with MAF unhooked, and see how it drives.

Computer can run the engine without MAF data, it will run richer and be less responsive but it will be drivable.

What was the original code that caused you to replace MAF sensor the first time?

Thinking would be that you fix a symptom of the original problem by replacing MAF sensor but didn't fix the actual problem.
Could be a wiring issue for the MAF sensor, could be air leak in the big tube connecting MAF to intake, or vacuum leak in intake manifold.
I would clean old MAF sensor if you still have it and try it.

Last edited by RonD; 11-08-2014 at 10:40 AM.
Reply With Quote
+ 0 -

Similar Threads
Thread Thread Starter Forum Replies Last Post
Where is the mass airflow sensor on a 1995 Ranger? 95Rangerjunkie SOHC - 2.3L & 2.5L Lima Engines 0 05-20-2013 01:12 PM
MAF- Mass airflow sensor 1996 Ford Ranger-KANSAS 1996Ranger4x4SuperCabSTX Interior, Exterior, Electrical, & Misc. 4 09-29-2011 10:01 AM
Want to Buy: Good Condition Mass Airflow Sensor fx4wannabe Engine & Drivetrain 8 03-21-2010 04:00 PM
Want to Buy: Mass Airflow Sensor. NC drppdyllwrngr Engine & Drivetrain 1 01-14-2010 04:58 PM
Mass Airflow Sensor change RangerJustin 2.9L & 3.0L V6 Tech 2 03-16-2005 02:28 PM

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

All times are GMT -6. The time now is 04:47 AM.