MAF Sensor, I need help

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Dennis - 20 Apr 2007 21:19 GMT

My son drives a 1999 Escort ZX2 with the L4 2.0 liter engine. He was
complaining that the car doesn't
have as much power that it used to and that it idles rough. I connected my
scan tool to check things out ( I'm new at this and far from an expert) and
noticed that the mass air flow sensor was 2.7 volts at idle. The specs are
.6-.9 volts.
The calculated engine load was 59.2 % at idle. The long term fuel trim
showed 2.3 %. There were no trouble codes set. Is this enough evidence to
replace the MAF sensor? I hear they aren't cheap so I need a second opinion.
Thanks so much for any help.

Dennis

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maxwedge - 20 Apr 2007 21:50 GMT

Clean the element in the maf with CRC ,maf cleaner.

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maxwedge

http://www.automotiveforums.com

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Steve Austin - 21 Apr 2007 02:07 GMT

> My son drives a 1999 Escort ZX2 with the L4 2.0 liter engine. He was
> complaining that the car doesn't
[quoted text clipped - 8 lines]
>
> Dennis

On a Ford MAF check the baro reading. Off more than 8hz from 159hz or
so (depending on where you live) clean or replace the MAF. A bad MAF
will usually show minus trims at idle and plus trims under load.

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Dennis - 21 Apr 2007 21:22 GMT

> My son drives a 1999 Escort ZX2 with the L4 2.0 liter engine. He was
> complaining that the car doesn't
[quoted text clipped - 8 lines]
>
> Dennis

Thanks, for the responses. As soon as I can pin my boy down long enough to
work on his car I'll
try cleaning the MAF sensor and go from there.

Thanks again,
Dennis

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