5.0L (1979-1995) Mustang Technical discussions on 5.0 Liter Mustangs within. This does not include the 5.0 from the 2011 Mustang GT. That information is in the 2005-1011 section.

No Throttle Response with MAF

Old 07-10-2010, 11:40 AM
Thread Starter
countxero's Avatar
Join Date: Jul 2010
Location: Georgia
Posts: 5
Unhappy No Throttle Response with MAF

Ok Here goes. I have a 1990 Mustang 5.0 has b303 cam, GT40 iron heads, and 3.73s Other than that it's stock. It ran pretty well for a few months and then while driving home it just stopped responding to the throttle at all. I unplugged the MAF and the car idles rough, but the throttle responds just fine. So I order another MAF and put it on. I was told that if the other MAF matched my AFH55 that the other MAF would work. Replacing with this MAF didn't correct the problem, which is not to say that I could have bought a defective or incompatible MAF I did buy off of ebay. I scanned the car and didn't get a MAF code. I got EGR closed, and Throttle postion sensor out of range. I tested the tps voltage, and MAF voltage for continuity and made sure that they did increase when I moved the throttle and made sure that the MAF registered a change when I blew on it and freed up the EGR. I also replaced the tps and EGR with three other parts off of doner cars. TPS reads 1.14 volts resting, and 4.89 WOT. MAF voltage reads 0.10 off and rises to about 2.50/3.00 volts when I blow on it.
Anyway am I wasting my time checking all these parts? Should I just buy a new MAF sensor, and if so can anyone recommend an aftermarket MAF or should I just buy OEM why or why not. Thanks in advance for you input.
countxero is offline  
Old 07-10-2010, 02:15 PM
Bubba 95SN
4th Gear Member
Join Date: Apr 2009
Location: N.C.
Posts: 1,893

Shopping for parts on ebay. I would avoid that.
Bubba 95SN is offline  
Old 07-10-2010, 05:31 PM
Join Date: Dec 2005
Location: Lil' Rhody
Posts: 22,376

TPS voltage should be under 1v.
AdderMk2 is offline  
Old 07-11-2010, 01:01 PM
3rd Gear Member
enix187's Avatar
Join Date: Apr 2007
Location: NC
Posts: 590

try cleaning the maf sensor (if you haven't already) you can buy the cleaner at autoparts stores, clean the little sensor inside of the hole
enix187 is offline  
Old 03-05-2015, 09:11 PM
Eurotech 23
Join Date: Mar 2015
Location: California
Posts: 1

My 1990 LX Mustang has no throttle response when the MAF is plugged in.... rough idle but full power....the MAF is new auto zone part....and I got a DTC of 66 MAF and a transmission oil temperature sensor open circuit....can someone tell me the fix???? Thanks
Eurotech 23 is offline  
Related Topics
Thread Starter
Last Post
Pipes, Boost & Juice
01-07-2018 07:16 AM
S197 Handling Section
10-03-2015 06:23 AM
4.6L (1996-2004 Modular) Mustang
09-30-2015 05:54 PM
2005-2014 Mustangs
09-29-2015 12:53 PM
Florida Regional Chapter
09-29-2015 12:06 PM

Thread Tools
Search this Thread
Quick Reply: No Throttle Response with MAF

Featured Sponsors
Vendor Directory

Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service

© 2019 MH Sub I, LLC dba Internet Brands

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to and affiliated sites.