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Hey, it seems like you know quite a bit about IP timing. I just replaced the IP on my 94 and I'm having a hard time get the TDCO set. It runs and seems to run the best when the actual timing is about 18*. I can make it run at about 7 but that is it. Anything below that and it won't run. My TDCO is currently at -2.02 and I can't get it set to anything else. I honestly don't know what to do at this point. Any thoughts?
The TOPDON LITE scanner indicated that the the Glow plugs in cylinders #1,3, 5 were bad. I removed
them, tested with an ohm meter and they checked ok. Then I tested them with 12 volts DC and
they would get red hot in only about two seconds. With a TOPDON PRO hope for something new
will come up. So far, the 6.6 L Duramax LLY
makes no effort to start with the starter spinning great.