[DML] Re: Running Problem-Rich Mixture (Long)

["supermattthehero" <supermatty@xxxxxxx>]

After recently dealing with a rich mixture problem myself, I have a 
few suggestions for you.

1.  Don't assume because it runs and accelerates that everything is 
fine.  If the previous owner was a real tinkerer, he/she could have 
very well masked all of the problems.  My previous owner did by 
playing with the brass screws and adjusting the mixture screw.  

2.  Pull the intake manifold and start from there.  It's blissful to 
assume you don't have vacuum leaks, but unfortunately there are so 
many places you can have them that it's totally not worth trying to 
find each one.  In other words, buy all new vacuum hoses, injector 
seals, intake manifold O-rings, check the pipe David T. mentioned, 
and order a new ported vacuum switch.  You really don't want to have 
to pull the intake manifold more than once every 23 years.  

3.  Get your idle speed motor working again, or get a new one.

4.  Adjust your mixture after you do all of the above.  If you did 
have any vacuum leaks, you'll now have an even more rich condition 
for sure.  Lean it out by turning the screw counter-clockwise, put 
the plug in, and then start it and see how she runs.  Repeat as 
necessary.  If you see black smoke and smell nasty exhaust, it's 
still running too rich.  If it dies after a period of time without 
blowing smoke, it's likely too lean.  

5.  After you get it to the point where it runs smoothly and the 
engine doesn't shake, pull all of your spark plugs and clean 'em 
up.  Running rich even for a short period of time will soot the hell 
out of them.  


Matt
#1604




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