MAF questions

[Steve Gorkowski]

You have too much oil on filter gets on wires needs to be cleaned and clean
filter.

Steve

Mike Rolica wrote:

> Ya, ECI  ..... Electronic cleaner injection Or STC   (switch to chevy <g>
> :-)  he he.. couldn't resist!
> Mike Rolica
> Meridian Magnesium Products
> Strathroy, Ont
> Ext. 260
>
>         -----Original Message-----
>         From:   David Cooley [SMTP:n5xmt at bellsouth.net]
>         Sent:   Monday, November 29, 1999 1:22 PM
>         To:     gmecm at efi332.eng.ohio-state.edu
>         Subject:        MAF questions
>
>         I have a question on MAF sensors in general.
>         My 97 Explorer 5.0 is MAF, and the design of the Ford MAF is kind of
> off
>         from what I'm used to on GM's.  It is a large bore with a sample
> tube in
>         the middle (Actually open to the front of the maf in the top inside,
> flows
>         straight down 90 deg. to main flow, then out the back into the flow
> of air
>         again).  Just behind the inlet to the sample tube is the sensor
> elements...
>         Look like light bulb filaments.  One in the air stream and one back
> up a
>         bit so it's not in the direct flow of air.  I assume they either use
> a
>         constant current generator and monitor voltage across the elements
> (one for
>         reference) or constant voltage and monitor current.  The problem is,
> they
>         are EXTREMELY sensitive to contamination...  I put in a K&N
> airfilter 6
>         months ago, and every 1000-2000 miles, I have to clean the MAF
> elements to
>         make it run right...  The last time, before I cleaned it, I was
> monitoring
>         it with Alex's OBD-2 scantool...  at 5000 RPM and WOT, I was flowing
> about
>         95 g/s air (definitely too low, thought the software for the
> scantool was
>         wrong!).  Engine pinged like mad at anything over 1/2 throttle. (no
> knock
>         sensor... Thanks ford!) Cleaned the MAF, and ping was gone...
> Airflow at
>         5000 RPM and WOT was 196 g/s.  Is there any way to alleviate the
>         contamination problem (short of going to a paper filter or a MAP
> based EEC)?
>         Thanks,
>         Dave
>
>         P.S.  Ford Motorsports sells K&N's, so it's not like they don't use
> them!
>         ===========================================================
>         David Cooley N5XMT Internet: N5XMT at bellsouth.net
>         Packet: N5XMT at KQ4LO.#INT.NC.USA.NA T.A.P.R. Member #7068
>         We are Borg... Prepare to be assimilated!
>         ===========================================================