C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

MAF bad?

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Old Nov 20, 2001 | 01:20 PM
  #1  
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Default MAF bad?

What happens when your MAF goes bad? Symptoms? I presume that a bad MAF may still look okay (wires not broken) to the naked eye? After much troubleshooting on a bogging problem with my '89, the mech is now replacing the MAF. Just tryin' to be a semi-educated customer here.
thanx,
ron
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Old Nov 20, 2001 | 03:34 PM
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Default Re: MAF bad? (rwd407)

The MAF is easy to trouble shoot, just disconnect the wires to the MAF, this will cause the car to run in the limp home mode (which is not that bad, only means ECM is only taking RPM's and coolent temp to calculate fuel mixture) if your problem goes away replace MAF. Symtoms of a bad MAF? My car felt like the fuel pump was cutting out and not supplying enough fuel.
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Old Nov 20, 2001 | 03:43 PM
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Default Re: MAF bad? (Rick86)

The book says lightly tap on the MAF with the engine idling. If the engine stumbles or shuts down, the MAF is bad. Question is.....how lightly is "lightly"??
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Old Nov 20, 2001 | 04:12 PM
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Default Re: MAF bad? (Red85)

The book says lightly tap on the MAF with the engine idling. If the engine stumbles or shuts down, the MAF is bad. Question is.....how lightly is "lightly"??
Which book are you using???
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Old Nov 21, 2001 | 09:24 AM
  #5  
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Default Re: MAF bad? (rwd407)

Thanks for the input. Yep, it was definitely acting like a fuel pick up problem under hard acceleration. That was the area first explored. The MAF has been replaced now and the mech. says it's runnin' great. Picking the car up at lunch today, so we'll see. Thanks again to you all for your input. Hope you and yours have a very Happy Thanksgiving...
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Old Nov 21, 2001 | 03:09 PM
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Default Re: MAF bad? (rwd407)

The "tapping" proceedure is in the "Chevy TPI Swapper's Guide". I've had several mechanics tell me the same thing and use it on all MAF cars.
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Old Nov 21, 2001 | 10:13 PM
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Default Re: MAF bad? (Red85)

Yep, that one of the tests!
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