[DML] New parts don't ALWAYS make your car run better...

["supermattthehero" <supermatty@xxxxxxx>]

Dear DMC Troubleshooting Experts,

Recently I purchased a bunch of parts from the various vendors to do 
a BIG tune-up.  This involved replacing all of the vacuum hoses, new 
ported vacuum switch, cleaning the fuel injectors (ultrasonically), 
new injectors seals, installing the auto-coolant bleeder, pulling 
the intake manifold to clean up the 'valley', install new spark 
plugs, new heater pipe, new MSD Blaster2 ignition coil, new intake 
manifold o-rings, calibrating the throttle and idle speed switch, 
and general overall cleaning.  Whew!  So, all of the above has 
already been done.  

Let me take a step back for a moment, prior to this, my car was 
running very well, or so I thought.  Then I started to read the DML 
more, and started to find little things.  Namely, the three brass 
screws were all turned open, there was no tamper-plug or plug of any 
kind on my fuel distributor, and there was some sputtering 
when 'revving' the engine.  Many of the vacuum hoses were dry and 
cracked.  So, I installed all of the above parts, and closed all 
three brass screws.  This leads me to where I am today...

Now that all of these vacuum leaks are taken care of, (or atleast I 
think they are) my car starts, runs for about 10 seconds, and then 
when the RPMS begin to settle down it either idles VERY rough or 
stalls.  The exhaust is awfully foul smelling.  Now I won't lie to 
you, the gas in the tank is probably 6 months old, and 93 (yes, I 
know now that it's wrong and I should be using 87) octane.  But 
anyway, the last interesting tidbit is that, if I take some tape or 
whatever and put it in where the 'tamper-proof plug' should go, the 
car will behave the way I just mentioned above, however it will be 
accompanied by visible black smoke.  Removing the plug makes the 
black smoke go away.  

Now, I also have a new oxygen sensor waiting to be installed, but I 
wanted to wait until I got some fresh gas in the car first, in fear 
of ruining it.  Call me dumb, but could this be a case where I need 
to adjust the mixture screw?  

thanks,

Matt
#1604  




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