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No Throttle Response with MAF

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

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Old 07-10-2010, 12:40 PM
  #1  
countxero
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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.
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Old 07-10-2010, 03:15 PM
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Bubba 95SN
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Shopping for parts on ebay. I would avoid that.
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Old 07-10-2010, 06:31 PM
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AdderMk2
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TPS voltage should be under 1v.
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Old 07-11-2010, 02:01 PM
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enix187
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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
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Old 03-05-2015, 10:11 PM
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Eurotech 23
 
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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
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