MAF Ground problems on a 91 Classic
Brian Cembor
bcembor@fastenal.com
Fri, 17 May 2002 16:20:11 -0500
I am kinda new here, but, back in Subaruland we had similar issues with the
MAFs on '99 2.5RS's... which is why Subaru went to MAPs instead....
Anywho... it was diagnosed finally as the filament in the MAF that actually
went bad... do you have a cone filter or CAI? In my experience this is a
common fault for failing MAFs is that the filament "dries out" unlike in a
stock air-box type filter... MAF's are notoriously too sensitive... leading
many manufacturers to move to MAPs...
Just my $.02... I could be wrong
Brian
'92 SE-R
'99 Subaru Impreza 2.5RS RIP
From: Dan [SMTP:slamtry@yahoo.com]
Sent: Friday, May 17, 2002 3:59 PM
To: se-r@lists.deskmedia.com
Subject: MAF Ground problems on a 91 Classic
I am having a continuing problem with my 91 Classic and would
appreciate
any advice. I regrounded the MAF about 18 months ago so but about
once
every four to six weeks I get symptoms which appear to be
MAF-related. I
say this for three reasons:
1) It exhibits the standard MAF symptoms - stalling at stoplights,
etc.
2) It thows a code 45 - well known for being caused by MAF problems
rather than the leaky injectors it is supposed to indicate.
3) I can temporarily solve the problem by taking off the other end
from
the MAF, i.e. where the wire is grounded to the motor, and cleaning
it and
applying dielectric grease. This makes it run great for a month or
so.
What is weird is that the MAF readings are within spec even BEFORE I
do
this so it seems strange that it should be the MAF at all. However
the
incontrovertible fact is that removing, cleaning and replacing the
ground
end does solve it at least for a while. Am I missing something here?
Could
it be some other sensor that is causing the problem and it is just
resetting the ECU that makes it seem like regrounding is solving the
problem?
Dan
Tom Mak <tmak26b@snet.net> wrote
>Hey guys, I recently soaked my MAF plug with contact cleaner
because i
>am suspecting a bad ground on there. I have a 94 G20 btw. Well it
SEEMS
>to take care of the problem for a little bit, but it went bad
again. Now
>my question is. If I want to do this job permanently. Do I have
to
>reground the plug itself, or is the problem originated from the
ground
>plug at the other end or something is wrong with the wire/ I want
to do
>the wire, but i am confused at how i should do it.
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