MAF Mess

[Programmer]

Bill,
IF you disconnected the MAF and the car straightens out, you've found
the quick and dirty method of diagnostics. MAF sensors are bad for getting
lint and other foreign material on the sensing area--and this then tells the
ECM the wrong grams/sec rate...try cleaning it first with some "brake
cleens"--thoroughly let it dry and then re-install on the car and check
operation. IF it doesn't smarten it up--you'll probably need a new MAF.
Lyndon.
-----Original Message-----
From: Bill Shaw <bshaw at connix.com>
To: gmecm at diy-efi.org <gmecm at diy-efi.org>
Date: April 19, 2000 7:48 PM
Subject: MAF Mess


>I'm having a lean misfire problem on my '87 Camaro V6,  sometimes stalls at
idle,
>misfires severely at anything more than 1/3 throttle. No trouble codes or
SES.
>My first guess was an injector problem,  but trying to troubleshoot it
today I
>pulled the MAF connector while it was idling.  It stalled and when
re-started lit
>SES and gave a MAF error code. After that it ran much better with  no
misfire but
>the SES was on steady.  A few hours later I started it,  SES was out and
the
>misfire was back.
>
>That says to me it's a sensor problem,  not an injector problem. Does it
mean
>it's the MAF?   Will the ECU ignore ALL the sensors while running with the
SES
>on,  or just the one that set the error code?  Is there a way to test the
MAF to
>see if it's working properly?
>
>Thanks,
>
>Bill
>
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