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MAF in backwards



 
 
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  #1  
Old July 28th 07, 10:56 PM posted to rec.autos.tech
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Default MAF in backwards

what sort of problems would I experience if the Mass Air Flow sensor
is in with the arrows pointing the wrong way? I just found mine in
wrong and I am experiencing intermittant poor acceleration when the
engine is hot on a hot day. I haven't driven it enough (now that its
in correctly) to know for sure if its better now.

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  #3  
Old July 29th 07, 04:32 AM posted to rec.autos.tech
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Default MAF in backwards

On Jul 28, 4:49 pm, PauL > wrote:
> wrote:
>
> > what sort of problems would I experience if the Mass Air Flow sensor
> > is in with the arrows pointing the wrong way? I just found mine in
> > wrong and I am experiencing intermittant poor acceleration when the
> > engine is hot on a hot day. I haven't driven it enough (now that its
> > in correctly) to know for sure if its better now.

>
> Engine won't run because the cone shuts off the airflow.


it actually runs no differently when its in backwards

  #5  
Old July 29th 07, 08:19 AM posted to rec.autos.tech
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Default MAF in backwards

On Jul 28, 10:35 pm, clifto > wrote:
> wrote:
> > On Jul 28, 4:49 pm, PauL > wrote:
> >> wrote:

>
> >> > what sort of problems would I experience if the Mass Air Flow sensor
> >> > is in with the arrows pointing the wrong way? I just found mine in
> >> > wrong and I am experiencing intermittant poor acceleration when the
> >> > engine is hot on a hot day. I haven't driven it enough (now that its
> >> > in correctly) to know for sure if its better now.

>
> >> Engine won't run because the cone shuts off the airflow.

>
> > it actually runs no differently when its in backwards

>
> Seriously, what are the arrows for?
>
> --
> "Liberals used to be the ones who argued that sending U.S. troops abroad
> was a small price to pay to stop genocide; now they argue that genocide
> is a small price to pay to bring U.S. troops home."
> -- Jonah Goldberg


the arrows are for direction of air flow. it makes no difference in my
1997 suburban with a 5.7

  #6  
Old July 31st 07, 05:36 AM posted to rec.autos.tech
Paul Hovnanian P.E.
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Posts: 633
Default MAF in backwards

wrote:
>
> On Jul 28, 10:35 pm, clifto > wrote:
> > wrote:
> > > On Jul 28, 4:49 pm, PauL > wrote:
> > >> wrote:

> >
> > >> > what sort of problems would I experience if the Mass Air Flow sensor
> > >> > is in with the arrows pointing the wrong way? I just found mine in
> > >> > wrong and I am experiencing intermittant poor acceleration when the
> > >> > engine is hot on a hot day. I haven't driven it enough (now that its
> > >> > in correctly) to know for sure if its better now.

> >
> > >> Engine won't run because the cone shuts off the airflow.

> >
> > > it actually runs no differently when its in backwards

> >
> > Seriously, what are the arrows for?
> >
> > --
> > "Liberals used to be the ones who argued that sending U.S. troops abroad
> > was a small price to pay to stop genocide; now they argue that genocide
> > is a small price to pay to bring U.S. troops home."
> > -- Jonah Goldberg

>
> the arrows are for direction of air flow. it makes no difference in my
> 1997 suburban with a 5.7


It depends on exactly what kind of MAF sensor you are talking about. A
hot wire sensor won't care which way the air flows. A mechanical type
may very well block if the flow pushes the cone/diaphram or whatever
closed instead of open.


--
Paul Hovnanian
------------------------------------------------------------------
Relax, its only ones and zeros!
  #7  
Old July 31st 07, 06:42 AM posted to rec.autos.tech
Comboverfish
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Posts: 644
Default MAF in backwards

On Jul 29, 2:19 am, wrote:
> On Jul 28, 10:35 pm, clifto > wrote:
>
>
>
>
>
> > wrote:
> > > On Jul 28, 4:49 pm, PauL > wrote:
> > >> wrote:

>
> > >> > what sort of problems would I experience if the Mass Air Flow sensor
> > >> > is in with the arrows pointing the wrong way? I just found mine in
> > >> > wrong and I am experiencing intermittant poor acceleration when the
> > >> > engine is hot on a hot day. I haven't driven it enough (now that its
> > >> > in correctly) to know for sure if its better now.

>
> > >> Engine won't run because the cone shuts off the airflow.

>
> > > it actually runs no differently when its in backwards

>
> > Seriously, what are the arrows for?

>
> > --
> > "Liberals used to be the ones who argued that sending U.S. troops abroad
> > was a small price to pay to stop genocide; now they argue that genocide
> > is a small price to pay to bring U.S. troops home."
> > -- Jonah Goldberg

>
> the arrows are for direction of air flow. it makes no difference in my
> 1997 suburban with a 5.7- Hide quoted text -
>


Now that you've mentioned a make and model we can continue. I haven't
looked at that style in quite a while, but I don't think that it has
any (significant) asymmetrical airflow paths inside. Also it is
unusual in that it *can* be turned around. I still wouldn't use it
backwards unless it was for some sort of testing. The MAFs I see on a
daily basis can't be installed backward in their air boxes.
Furthermore, there is a designed in 'windbreak' for lack of better
terminology that would surely interupt intended airflow patterns
around the two sensor elements if it were oriented wrong.

Toyota MDT in MO

 




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