Listers:
I'm afraid my rough running problem has returned. As I mentioned in a post
from last week, I got the car back from the shop after the cracked
distributor rotor was replaced and the PI system was adjusted. The car ran
great for a total of about 90 minutes. Then it started to run very roughly
again. I removed the plugs and all were fouled. The mechanic had warned me
that he didn't have the correct plugs available, so he put in a set of a
cooler heat range which he suspected I would have to replace in time. So I
put in the correct set, which I had in my garage. That also solved the radio
crackling problem that only began with the previous set of plugs.
Unfortunately, the new plugs didn't make the car run correctly. It still
runs mainly on 5 cylinders, but smooths out in an inconsistent way, sometimes
at high rpm and sometimes at low (most often below 2000). It is completely
obvious when it smooths out and when it gets rough again.
Of course, I should return it to the shop for more work, but I would love to
try to troubleshoot some of the more obvious things myself if I could. As
usual, the shop is an hour drive from my home (actually took 90 minutes in
traffic last week), and I wouldn't mind learning something useful. What is a
systematic way to troubleshoot this? I suspect ignition from the way it cuts
in and cuts out. The car has been converted to a Crane XR 700 optically
triggered electronic ignition system. If anyone is thinking fuel system, it
has also been converted to a Bosch fuel pump which seems to be working
properly.
Any and all thoughts are appreciated!
Michael Samuels
SamuelsMA@aol.com
'70 TR6 PI
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