[DML] Re: Auto-enrichment??

["content22207" <brobertson@xxxxxxxxxxxx>]

Vacuum leak. Make sure you reattached the charcoal canister lines
properly: 
- Line from the tank goes straight into the canister (not through the
diaphragm on top)
- Purge signal from under the throttle plates goes to the diaphragm
- Evacuation line to the cold start tube is opened by the diaphragm on top

Also ensure your diaphragm doesn't have a hole in it.

A vacuum leak actually causes the engine to run lean. That's what
kills your fuel economy -- adjustments are made to bring fuel/air
mixture back to normal at idle (high vacuum), which then translates
into over enrichment at throttle.

Bill Robertson
#5939

>--- In dmcnews@xxxxxxxxxxxxxxx, Enid/Jeremiah
<hispanicangeleyes@xxxx> wrote:
> 
> Ok, here's the story.
> 
> I wanted to put my A/C belt on.  Through this process
> once I was done, I was reconnecting the three lines
> that go from the "coal canister" in the left of the
> fiberglass body to their individual placements.  Got
> two out of three hooked up - last one went under the
> intake.  When I connected this one, the hose on the
> right was hanging in my hand.  I realized the only way
> to reconnect it under the intake was to pull the
> "elbows" off the front of the intake.  So I did this
> and reconnected the last line.  Put everything back
> together the way I found it to a "t".  
> 
> Started the car, runs fine when warming up from
> 100-160 - oscillates a little for 1-2 mins as normal,
> then idles perfectly (I'm one of those "Non-Lambda
> system" owners - O2 sensor is unhooked for a "smooth"
> idle right at 800 rpms or so).  Now, my problem is
> from 160 (first unmarked line) to 220 - the car begins
> to RE-oscillate - as if it's running too rich while
> warm.  It will do this until the cooling fans come on,
> then of course it'll stop oscillating due to a load
> being put on the engine.  Once the fans turn off, the
> engine will slowly begin to oscillate again gaining
> with the oscillations becoming stronger until the fans
> come on again - over and over and over.  
> 
> The idle once held perfectly steady in all gears, now
> it does this.  In "D", it does still hold steady, but
> in "P" it does all I described.  I don't know a single
> thing I could have broken.  The only lines I remotely
> tampered with are the 3 black ones that go over the
> A/C Compressor.
> 
> One thing I have noted is if I disconnect the bottom
> black line off the cold start valve, the engine will
> idle perfectly in all gears, so somehow it has
> auto-enriched itself.  I don't know how, and I don't
> know what to check to lean it back down other than of
> course the mixture screw.  Any ideas would be
> welcomed.  Thank you.
> 
> Jeremiah
> 
> 
> 		
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