Ohm Reading for a 2008 Cadallic Coil

The Story:

The CTS is dorsum! I really practise love this car, but it seems that everything that was going to go wrong with it went wrong within a 6-month period. This time she limped in with a misfire. We showtime noticed something was up 1 night when nosotros went to aggressively modify lanes. I preface that argument with the word "aggressively" considering the symptom would only manifest itself higher up 5k rpm's under ¾ or full throttle. Otherwise, when driving around town she felt perfectly fine. In hindsight she probably had a slight stumble, only cipher that y'all could observe.

Earlier y'all get-go you'll have to remove all the plastic trim.

Here's the cute iii.6l DI V6 you'll exist working on.

When we punched the gas though, we knew something was instantly wrong. Physically the car had a difficult fourth dimension maintaining the rpm range above 5k. It would noticeably misfire and y'all could audibly hear the engine making a "pop, pop, pop" sound. Luckily information technology wasn't a mystery symptom, as the SES light instantly turned on. Getting home we popped the code reader on and P0300 & P0301 came up. P0300 is a full general misfire code and P0301 is a specific misfire code on cylinder one.

Parts for this DIY:

• New 3.6L Direct Injection V6 Ignition Curl
• Pack of 6 new Spark-plugs

Tools You'll Need:

• A Ratchet Set
• A Screwdriver Set
• An OBD2 Lawmaking Reader
• Dielectric Grease

Here'southward the P0301 lawmaking

The Ready:

After doing a fleck of research on the various CTS forums it seemed like there was likely two potential culprits. The outset, and near hands replaced would be a bad spark plug. The 2d would be to supercede the actual coil module. Given that the car was rolling up on 50k miles, we went ahead and inverse all vi spark plugs. Luckily changing the spark plugs on these 3.half dozen DI engines isn't terribly difficult. They are easily accessible from the top of each cylinder head bank. You'll probably spend more time removing and installing plastic beauty panels than doing the work.

The spark plugs are located through the valve covers.

Access is fairly easy, you just need a long extension.

To replace the plugs yous'll need to remove each coil module assembly, giving you access to the spark plug cached within the cylinder head. When removing the spark plugs make sure you use a proper spark plug socket with a rubber insert. This will let you pull the unit out. When installing the new plugs there are a couple things to keep in heed. First, the plug should go in very easily. Have your time and thread it past paw. It should go in quite a few turns with trivial or no resistance. If y'all feel likewise much resistance likewise quickly, unscrew it and start again. You must make certain that you exercise not damage the spark plug threads on the aluminum cylinder heads as stripping them would show disastrous. Secondly, once yous snug upwardly the new spark plug practice not overtighten them. These plugs but take 15 ft. lbs. of strength.

Hither'south everything back in place.

With the plugs in you but need to reinstall the curl module assemblies. Before doing so though you lot smear some dielectric grease to the inside of the coils. The purpose of the grease is twofold. First, it completely bridges the contact area between the coil and the spark plug, assuasive for maximum electrical transfer. Secondly, it maintains a dainty greasy joint between the plug and coil. This is important for the next guy who has to replace the plugs as they tend to heat upwards and almost weld themselves together with the coil. When that happens you accept to yank and pull at it until information technology finally rips autonomously. A actually crappy procedure that'southward hands avoided with just a dollop of dielectric grease. The bolts on the coils should exist torqued down to only 7.v ft. lbs., so get easy on them.

With everything dorsum together we went ahead and cleared the codes and started her up. The CTS was running great. We took her for a spin, gunned her and she performed as expected. Perfect!

P0301 points to cylinder #ane.

It'due south as easy every bit unplugging and replacing.

3 weeks later on she was back. Aforementioned symptoms, aforementioned trouble codes. Adjacent step and then was to replace the ignition scroll module on cylinder #1 (based on the P0301 code). Usually, I'd look and order the office online as it's much cheaper, but the motorcar needed to be fixed on the spot so I made my manner downwardly to the local auto part and ordered a new one. When it's fourth dimension for you to get a new coil make sure you are getting the correct version, as the coil for the Direct Injection engines is different from the regular Fuel Injected engines. I unfortunately did not follow this advice and trusted the employee at Autozone. In fact, I didn't realize it was the wrong coil until it was already screwed on. (The one you need for the Directly Injected engine is ACDelco D515C GM Original Equipment Ignition Coil). They are very similar to each other so you can nigh go information technology kinda on, but the electrical plug volition be dissimilar. To add to the issue, as I went to remove the wrong unit, the screw that holds it in place started to spin. Ultimately this can happen to you regardless of using the correct part or non and then I wouldn't arraign it solely on installing the wrong coil.

If I would have paid attending I would have noticed that while like, the DI and non-DI coils are quite unlike.

Hither you can come across the commodities slug after yanking it out.

If you have a curlicue module retaining commodities get-go to spin on you, don't fret. The metallic sleeve that the bolt screws into is glued to the cylinder caput cover. Equally such, if the bolt starts to spin that means the adhesive has been compromised. If the glue is shot, then you can but yank it out. I was able to remove mine using a small breaker bar and prying up on the electrical housing of the curlicue module. Once you pop information technology loose remove the sleeve using a pair of pliers to hold it in place. With the sleeve now loose, yous'll want to pry the ii legs slightly apart, as this will cause the much-needed resistance when installing it onto the cylinder caput cover. Just to exist certain I went ahead and put some new agglutinative before plunging the sleeve dorsum on.

If you spread the two halves of the slug a chip it'll take more tension to stay in place.

Dorsum in identify, adept as new.

This is what the new 1 should expect like.

While I was waiting for the sleeve and adhesive to dry I went back to the Autozone, returned the incorrect unit and picked upward the correct one. This time I took the old unit with me to make sure. Later that, it was simply a thing of installing everything back together and immigration the problem codes.

New coil installed and we're all done!

The Result:

Just similar earlier the CTS fired right up. A thorough trashing of it proved that the engine was humming as information technology should. Now that it'due south been a number a number of months and the outcome has non resurfaced I experience confident that the event is completely resolved. U ltimately there is null preventing anyone from performing this fix. The actual repair is very simple. You'll merely need to keep a level caput and find someone or someplace that volition read the SES code. After that, it's smoothen sailing.

Useful Parts & Tools to Aid you lot with this DIY Project:

valenciaflocruing.blogspot.com

Source: http://www.smartenoughtodiy.com/cadillac-cts-spark-plugs-coil-module/

Share this post