what is a egr & a evp and where

Ben Davis

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Nov 25, 1997, 3:00:00 AM11/25/97

to Frank Demarco

Frank Demarco wrote:

> I have the same problem as most check engine flickers on and off
> when cold temps and just starting no changes in engine performance
> or anything I can sense I hear evp connections and cleaning changing
> etc also hear egr do not know what a evp or egr is and do not know what
> they do please help me locate and work on them if possible thank you
>
> --
>
> ==============================================================================
> Frank Demarco
> Raleigh, N.C. 27613
> ==============================================================================

EGR stands for Exhaust Gas Recirculation. It's one of those emmition gadgets
on you EFI 5.0. If you have a mustang older than '86, the advice given to your
doesn't even apply. It sits to the rear of the throtle body. Try taking off the
air intake track and giving everything a good cleaning. Check your throtle body
to make sure you don't have any kind of deposits gumming anything up. Carb and
choke cleaner works great for this kinda stuff.

Try it and tell me what happens.

Ben Davis
bld...@fair.net

Frank Demarco

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Nov 26, 1997, 3:00:00 AM11/26/97

to

Strat1995

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Nov 26, 1997, 3:00:00 AM11/26/97

to

>I have the same problem as most check engine flickers on and off
>when cold temps and just starting no changes in engine performance
>or anything I can sense I hear evp connections and cleaning changing
>etc also hear egr do not know what a evp or egr is and do not know what
>they do please help me locate and work on them if possible thank you
>
>

The EGR valve is that big round thing on the back ot the throttle body. It
lookes kind of like a speaker frame. The evp is the plastic sensor attached to
the back of it. The whole assembly comes off by removing two nuts,
disconnecting a vacumn line and disconnecting a wiring harness.

Mark Kovalsky

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Nov 26, 1997, 3:00:00 AM11/26/97

to

EGR is Exhaust Gas Recirculation. EVP is EGR Valve Position Sensor. The
EGR valve inserts exhaust gas into the intake manifold. This is actually a
good thing! The EVP tells the EEC (Electronic Engine Control) what the
EGR valve is doing.

--
Mark
----------------------------
'30 Ford Model "A" Tudor
'94 Ford Club Wagon 7.3L Diesel with Hypermax Turbo
'94 Sportsmen's 37' Travel Trailer
'97 Ford Taurus SHO
----------------------------------------------------------------------
The views expressed above are mine, and mine alone.

Jonas

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Dec 1, 1997, 3:00:00 AM12/1/97

to

Frank Demarco wrote:
>
> I have the same problem as most check engine flickers on and off
> when cold temps and just starting no changes in engine performance
> or anything I can sense I hear evp connections and cleaning changing
> etc also hear egr do not know what a evp or egr is and do not know what
> they do please help me locate and work on them if possible thank you
>

> --
>
> ==============================================================================
> Frank Demarco
> Raleigh, N.C. 27613
> ==============================================================================

had the same problem it was my eps, the damn needle inside broke off so
the computer had no idea what the egr was doing