Code P0300 and weak cylinder on #6
 

Pulled codes on my code reader and that's what I got. The live diagnostics show #6 cylinder weak at idle and normal when reved. Anybody know what this means. I'm still trying to figure out this scanner.

a pretty good guess would be a bad plug or a partially-clogged fuel injector.

naturally, it's on a rear cylinder. :evil:

I'd do plugs and wires if they haven't been done recently. Makes a big difference.

The plug wires and plugs were just put in last week.

Code PO300 means that the computer has detected a misfire on this cylinder. I would change the plug and wire on this cylinder. If the code still repeats itself then change the coils around. After you changed the coils around and you still get a misfire on another cylinder bank then you know you have a faulty coil. I've been through this!!!

Will a coil pack from an 89 Bonneville interchange with the 94?

i dont think so... but if u need some coils i got some...

check out the for sale section in a couple minutes

Being that you recently changed the plugs and wires, swap the coils and look for the problem again. If it moved, then it's the coil. If not, move swap wiire, and pull the plug. Maybe the plug is cracked.

Measure the resistance of each wire. It should be a natural increasing progression from 1, 3, 5 and 2, 4, 6. I'm betting you have a high resistance on #6 or a short to chassis ground through the insulation.

Yes, they should interchange, since a 91 3800 will take a 92 and up coil coilpack, and plug in the same.

I wouldn't use one. I believe some may be the old magnavox ignition, not a delco. Its not a great ignition system. Try one from a 92 and up.
I know I am looking for one myself.