Re: [DMCForum] Engine running half rich half lean.
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Re: [DMCForum] Engine running half rich half lean.

> the engine will run half lean and half rich.

I think that it is too coincidental that one side of your
engine runs lean and the other side rich.  The fuel
distribution & ignition systems are unlikely to do this, but
technically it is possible.  I suggest looking at your air
mixture screws.  The big one controls all the air, but the
two smaller ones control either side.  If these aren't
balanced then it can cause a lean/rich difference from
side-to-side.  Did you forget and leave a wadded up paper
towel in your intake manifold?  I usually shove rags in
engines while I have them apart to make sure that dirt or
whatever doesn't get in.  But I would be really screwed if I
didn't remove them all.

> The engine will idle fine when cold, but as the car warms
up, the idling becomes very erratic.

This sounds like a bad idle speed ECU to me.  Try swapping
with someone else's car and see if the problem follows the


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