Carburetor EGR port question - Page 4

Simpson wrote:

I can assure you I haven't given much thought to your posting methods.  I
did ask a couple of questions and have made some suggestions.....  

    

the

vacuum

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jim wrote:

You can go crawl back into your hole, jim. You've expended your good will.

Chuck Norris once roundhouse kicked someone so hard that his foot broke
the speed of light, went back in time, and killed Amelia Earhart while
she was flying over the Pacific Ocean.

Crop circles are Chuck Norris' way of telling the world that sometimes
corn needs to lie down.

Chuck Norris is ten feet tall, weighs two-tons, breathes fire, and could
eat a hammer and take a shotgun blast standing.

The Great Wall of China was originally created to keep Chuck Norris out.
It failed miserably.

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northern Australia, is the most venomous creature on earth. Within 3
minutes of being bitten, a human being experiences the following
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the feeling of being repeatedly kicked through a car windshield.

Most people have 23 pairs of chromosomes. Chuck Norris has 72... and
they're all poisonous.

If you ask Chuck Norris what time it is, he always says, "Two seconds
'til." After you ask, "Two seconds 'til what?" he roundhouse kicks you
in the face.

Chuck Norris drives an ice cream truck covered in human skulls.

When Chuck Norris sends in his taxes, he sends blank forms and includes
only a picture of himself, crouched and ready to attack. Chuck Norris
has not had to pay taxes, ever.

The quickest way to a man's heart is with Chuck Norris' fist.

Chuck Norris invented Kentucky Fried Chicken's famous secret recipe,
with eleven herbs and spices. But nobody ever mentions the twelfth
ingredient: Fear.

CNN was originally created as the "Chuck Norris Network" to update
Americans with on-the-spot ass kicking in real-time.

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There is no theory of evolution, just a list of creatures Chuck Norris
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Chuck Norris once ate three 72 oz. steaks in one hour. He spent the
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What was going through the minds of all of Chuck Norris' victims before
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Police label anyone attacking Chuck Norris as a Code 45-11.... a suicide.

Chuck Norris doesn't churn butter. He roundhouse kicks the cows and the
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Chuck Norris doesn¹t wash his clothes, he disembowels them.

A Handicapped parking sign does not signify that this spot is for
handicapped people. It is actually in fact a warning, that the spot
belongs to Chuck Norris and that you will be handicapped if you park
there.

Chuck Norris will attain statehood in 2009. His state flower will be the
Magnolia.

Someone once videotaped Chuck Norris getting pissed off. It was called
Walker: Texas Chain Saw Masacre.

If you spell Chuck Norris in Scrabble, you win. Forever.

Chuck Norris originally appeared in the "Street Fighter II" video game,
but was removed by Beta Testers because every button caused him to do a
roundhouse kick. When asked bout this "glitch," Norris replied, "That's
no glitch."

Fool me once, shame on you. Fool Chuck Norris once and he will
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The opening scene of the movie "Saving Private Ryan" is loosely based on
games of dodgeball Chuck Norris played in second grade.

Chuck Norris once shot down a German fighter plane with his finger, by
yelling, "Bang!"

Chuck Norris once bet NASA he could survive re-entry without a
spacesuit. On July 19th, 1999, a naked Chuck Norris re-entered the
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of 3000 degrees. An embarrassed NASA publically claimed it was a meteor,
and still owes him a beer.

Chuck Norris has two speeds: Walk and Kill.

Someone once tried to tell Chuck Norris that roundhouse kicks aren't the
best way to kick someone. This has been recorded by historians as the
worst mistake anyone has ever made.

Contrary to popular belief, America is not a democracy, it is a
Chucktatorship.

Teenage Mutant Ninja Turtles is based on a true story: Chuck Norris once
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Chuck Norris is not hung like a horse... horses are hung like Chuck
Norris.

Faster than a speeding bullet ... more powerful than a locomotive ...
able to leap tall buildings in a single bound... yes, these are some of
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uncertainty principle -- you can never know both exactly where and how
quickly he will roundhouse-kick you in the face.

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Decades from now your descendants will occasionally clutch their heads
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When it was discovered by Albert Einstein and made public, Chuck Norris
roundhouse-kicked him in the face. We know Albert Einstein today as
Stephen Hawking.

Chuck Norris doesn't shower, he only takes blood baths.

Mike Romain wrote:

 >
 > Mike
 > 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
 > 'New' frame in the works for '08.  Some Canadian Bush Trip and Build
 > Photos: http://mikeromainjeeptrips.shutterfly.com


Mike,

I just popped the top off the carb and removed the boost venturi to get
at the area around the throttle plates. The barrel that has the
designated EGR port has a perforation just above the closed throttle
plate just as I expected. When I attach a hose to the designated EGR
port I can blow air through the perforation. When I plug up the
perforation inside the venturi with my finger, the air flow stops. This
is the case with the other barrel that has the designated spark vacuum
port. The only difference between the two seems to be the relative size
of the venturi perforations, the EGR side being slightly smaller and the
height relative to the closed throttle plate.


three hours later... I just got back from ripping the carb out of its
moorings and teraing it down and comparing it with the old original.
Same body - different porting. I cut a new slot for the EGR port and
widened the holes that feed the canister purge line into the the venturi
just above the throttle plates, both mods to conform to the original.

The new carb also differed from the original through a hole in the
gasket that connects the throttle body to the main body. This hole in
the gasket on the new carb connected the EGR hole in the throttle body
just above the throttle plate in one barrel to a hole in the base of the
venturi. The original carb did not have this hole in the gasket or the
hole in the base of the venturi, so I flipped the gasket to put the hole
on the other side where nothing is happening and the hole is not
connecting anything to anything.

I am about to go out now and take it for a test drive to see what
happens after it warms up and the EGR circuit kicks in. I have a vacuum
meter teed into the vacuum line to the EGR valve so I should be able to
see if the mod works like the original. If not, I will negate that
particular mod in some fashion and go back to running the EGR valve from
the park vacuum port, which is what got me passed smog.

It's a frikken obsession, but I bought this truck new and I refuse to
let it die for want of a replacement mixture control solenoid.

Thanks Chrysler.

Thanks Holley.

Way to stand behind your products.

Simpson wrote:

When we mod our Jeeps to take out the feedback carb, we can run the
ignition module or even a replacement stand alone distributor or
ignition replacement without the rest of the smog computer controls.

The reason is or 'ford' emissions control box goes into 'limp home' mode
basically clamping down on the timing advance.

When we wire our ignition control modules directly to the distributor in
whatever form, we bypass this, our timing jumps about 15 deg and has to
be reset and we get a sweet 'seat of the pants' 25% boost in power.

We can have 'fun' with the new vacuum line layouts as well.

Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
'New' frame in the works for '08.  Some Canadian Bush Trip and Build
Photos: http://mikeromainjeeptrips.shutterfly.com

Mike Romain wrote:

Good point, Mike. There is a 'open loop' mode that this computer may
default to if it senses a value outside of its programmed parameters.
This computer controls spark advance timing and fuel mixture, but now
that the carb no longer has a mixture control solenoid, that aspect of
control is gone and only the spark timing is left.

Your post raises an important point for me. I have the code reader for
this beast. It's almost prehistoric but it works great. I got it used
on eBay because good luck trying to find one new. When I had the old
original feedback carb installed, the mixture control solenoid would get
stuck. At one point, I screwed down the allen screw on top of the
solenoid to close the auxiliary main jet and the auxiliary air bleed in
an attempt to convert the feedback carb into a convention carb. Even
with the solenoid modified so that the electrical pulses to it were
doing nothing, the computer failed to set any codes. I would have
expected a code set for the the O2 sensor perhaps because it was no
longer controlling the fuel mix, but the computer seemed not to mind.
When I disconnected the wires to the feedback solenoid, however the
computer set a code for it.

Getting back to the 'limp-home mode' question. The only thing that the
computer now controls is the spark advance. The service manual spells
out the procedure for testing the spark advance at 2000rpm. After setup,
it says that I should be reading 38 degrees plus or minus 4. The only
trouble is, how will I read 38 degrees I don't have a magnetic timing
unit, which I assume will allow one to read that far off the scale used
with a timing light, which only goes plus and minus 10 degrees from TDC.

I guess I can wire the failed solenoid the computer. The windings are
still good. This way the computer will still read it as working and, if
the computer is working okay, the advance timing should working okay. If
I read the service manual correctly, there are only two spark advance
curves, one for cold and one for warmed up. I had a problem with the
coolant temperature sensor recently that caused the vehicle to only
operate in cold mode which was too retarded. Gas mileage sucked until I
discovered the problem. If there are only two modes I should be able to
tell if the computer is ignoring the absence of the mixture solenoid and
continuing to use the warmed up spark advance curve.


How does the situation you are describing dealing with spark advance? Is
this controlled by the 'ignition control modules' you mentioned?


Sounds like a real party :-)


--

Chuck Norris can fool all of the people all of the time and Chuck Norris
supports McCain.

McCain -- it rhymes with Hussein, Bahrain, cocaine, insane, wolfbane,
chest pain and chow mein.

Simpson wrote: The only

The newer timing lights have a digital display that gives the advance also

Yes, you can get stand alone distributors and/or ignition modules to put
in so your timing works like the pre-computer engine does.

Someone on AADT should know what ones plug in or what junkyard swaps are
easy?


I have the PCV and canister (gas tank and carb float vent) hooked up,
the EGR, the distributor advance and the air filter flaps all properly
plumbed for a manual tune.  I am set up to pass emissions with my
feedback carb manually set.

I got on one ASM 2525 test, 589 NOx, 16 ppm HC and 0.11% CO and my 1986
CJ7 'Utility Vehicle' doesn't have nor need a Cat up here in Canada...

Hand turn the engine until the #1 TDC timing mark on the balancer is
aligned with the minus 10 mark on the front cover scale.  Make a mark
(sharpie) on the balancer adjacent to the plus 10 timing mark on the
front cover scale.
Hand turn the engine again until your new balancer mark aligns with the
minus 10 mark on the front cover timing scale.  Make another new mark
(sharpie) on the balancer adjacent to the plus 10 mark on the front
cover scale.  Take a knife edged file and make this last mark more
permanent.

You've just marked your balancer 40 degrees advanced from the TDC mark.
The 2 degrees error you can work out easy enough.

aarcuda69062 wrote:

timing

Some times the simplest solution is the hardest to see.

Thanks for all your help and patience.


--

Chuck Norris can fool all of the people all of the time and Chuck Norris
supports McCain.

McCain -- it rhymes with Hussein, Bahrain, cocaine, insane, wolfbane,
chest pain and chow mein.