"Dennis" > wrote in message
. ..
> 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
>

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