Anybody have any experience with code 21. I installed a MSD Blaster SS coil and ran codes and got the code 21. I was reading the install manual (MSD) and they say to install a .8 ohm resistor in series with the positive coil wire, if the ignition is not current limiting type. I didn't install the resistor. I haven't tried to reinstall the original coil again and recheck for codes. I didn't check code prior to install either. I think this will be the next test. However in the mean time has anyone else experienced this code with the MSD Blaster install?
Installed on a 1987 S12, VG30E.
Post Merge: [time]07:39:44 PM / 16-Jan-12 [/time]
Anyone have a picture of the original coil and transistor package?