2006 Cadillac DTS Luxury II

Asked by Apr 13, 2017 at 11:29 PM about the 2006 Cadillac DTS Luxury II FWD

Question type: Maintenance & Repair

Recently I have a code P0300, as well as my service stabiltrak light, I do have a misfire in cylinders 6 and 8, replaced all coil packs and spark plugs, still have the misfire. when I start the vehicle, it smells like raw fuel coming out of the exhaust tips, it was at the dealer for 2 weeks, connected to a TECH 2 scanner, to find.. all coils are working properly, and getting spark to all cylinders, ive herd injector failure, or low compression caused by blown head gasket, or other catastrophic failure. any help would be greatly appreciated, ive owned this car for 2 months, and have driven it 3 weeks total, first time having it repainted, and 4 days after that, is when all this happened, Thank you, hopefully anyone can assist me with these issues I am having at this time

2 Answers

270

To make sure pull the cover gasket and look if there is any water signs it's blowing head gasket

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80,375

Since the ignition system appears to be working ok, I'd do a compression test on those two cylinders. They're next to each other and the head gasket could be blown in between them. This wouldn't give you any cooling system symptoms because it's not blown into the water jacket. The dealer should have known that! Unfortunately since it's 11 years old they probably just don't want to be bothered with it. Cadillac dealers tend to be snooty!! For the cylinders to fire you only need 3 things, fuel, spark, and compression. If any one of the 3 is absent, the cylinder(s) won't fire. HTH. -Jim

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