Northstar Engines and System Technical Discussion Discussion, Check engine light in Cadillac Engine Discussion; 1998 Cadillac DeVille Northstar. Check engine light came on today while driving. I checked codes and came up with PO300 ...
- 02-09-05 09:57 PM #1Cadillac Owners Member
- Join Date
- Feb 2004
Check engine light
1998 Cadillac DeVille Northstar.
Check engine light came on today while driving.
I checked codes and came up with PO300 (Engine misfire detected)
Before I take it to the shop, is their anything I can do.
Like fule injection cleaner in the fule tank??
- 02-10-05 06:21 PM #2
Re: Check engine light
Change wires and/or plugs. Stick with OEM.
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