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 MAF sensor question.

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Mark 96 Roady

Posts : 733
Join date : 2012-06-30
Age : 60
Location : Cleveland/Ft Myers Beach FL

PostSubject: MAF sensor question.   Mon 15 Aug 2016 - 9:07

My service engine soon light comes and goes. The other day I had new tires put on the Roady, and while it was at the shop I asked them to find out why. They tested it and said the code said the MAF sensor was bad. I replaced it about 2 years ago with a NAPA part, but got another one anyway. The light is still coming on. Now, here is my question; I think I may have a broken exhaust manifold bolt. When the car is cold, it is a little throaty, and once it warms up I don't notice it. Could that exhaust leak (if there is indeed one) cause the code I'm seeing? Any other thoughts? I guess I'm going have to break down and get my own OBD II tester.
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Rev Bob

Posts : 241
Join date : 2016-05-24

PostSubject: Re: MAF sensor question.   Mon 15 Aug 2016 - 9:22

"" Could that exhaust leak (if there is indeed one) cause the code I'm seeing? ""

Exhaust leak should not set a MAF code. MAF codes are usually set by the sensor reading outside of normal high and low limits, or a large mismatch between calculated air flow based on throttle angle and engine speed/load, and the MAF reading. They rarely "shift" output without hard failure.

Also try checking the air path between the MAF and the throttle body for any source of air in-leakage. Just for fun, take a look at the inlet of the MAF for signs of fouling. You might want to check the horn shaped inlet to the air filter box to make sure it hasn't deformed into a "figure 8" shape instead of an oval.
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