Tsb #18-na-246 2.0T LTG - Chevy Malibu Forum: Chevrolet Malibu Forums
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post #1 of 15 (permalink) Old 03-26-2019, 07:56 PM Thread Starter
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Tsb #18-na-246 2.0T LTG

Does anyone have link to or an electronic copy of TSB #18-NA-246? I'd like to get a copy of this TSB. It was referenced in a recent service I had to fix a CEL where they replaced the PCV with an upgraded design.

I've tried various links found in forum to TSBs and none of them work for me. I've accessed BBB's database but could not find this TSB.

thanks
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post #2 of 15 (permalink) Old 03-27-2019, 01:41 AM
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I would like a link to this bulletin to. About a month ago my 2017 Premier was in for another check engine light. They found gas in the oil. They said I make a lot of short trips and the fuel isn't evaporating from the crackcase. They changed the oil and replaced the pcv and that bulletin is on my paperwork. They told me a software update is coming for all 2.0 engines so they warm up quicker.
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post #3 of 15 (permalink) Old 03-27-2019, 04:12 AM
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Re: Tsb #18-na-246

Fuel dilution can be an issue with all modern small displacement turbo engines (TGDI), especially in a repeated cold/short cycle driving pattern. I personally would change my oil every 5k if you find that this is your typical driving pattern. Honda may actually have the biggest problem in this area with their CRV's, search "Honda CRV fuel dilution". If nothing else this reading will give you a good background on this issues how's and why's.
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post #4 of 15 (permalink) Old 03-27-2019, 04:25 AM
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Re: Tsb #18-na-246

I couldn't find that bulletin in any of the public databases - probably too new. It isn't in my alldata account but my account there is 1.5T specific and this bulletin seems coded 2.0 LTG. All I could find was some summary info but know nothing about Rick or the site history - seems to match the reports though: https://tinyurl.com/y2qavgdf

A possible calibration update can be an unpleasant side effect; if it were to be like Hondas it would idle at 3500 for a couple minutes to warm up quicker. Better to mitigate with being conscious of trip length and shorter oil change intervals as suggested above.
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post #5 of 15 (permalink) Old 03-27-2019, 04:37 AM
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Re: TSB #18-na-246 2.0t

The article that I found doesn't sound like Honda is getting to it quickly enough to suit some, but as you mention, the overall take-away for me is that oil can be diluted by fuel during cold starts, and more so in colder weather. It appears to be linked more to small-displacement turbocharged engines.

Just one more thing to worry about if you own an internal combustion engine with turbo direct-injection.
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post #6 of 15 (permalink) Old 03-29-2019, 02:40 PM
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Re: TSB #18-na-246 2.0t

Here is the summary of bulletin #18-NA-246. Again this is 2016-2018 2.0T LTG only.

Link to TSB: https://static.nhtsa.gov/odi/tsbs/20...54983-9999.pdf


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post #7 of 15 (permalink) Old 03-30-2019, 08:11 AM Thread Starter
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Re: TSB #18-na-246 2.0t

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Originally Posted by campb292 View Post
Here is the summary of bulletin #18-NA-246. Again this is 2016-2018 2.0T LTG only.

Link to TSB: https://static.nhtsa.gov/odi/tsbs/20...54983-9999.pdf
Thanks for digging this up. The short interval driving conditions described as a possible cause matches our experience. Hopefully this latest fix is the right one. In the 2 1/2 years we've owned this Premier, the CEL has come on 7 times and on 3 of those times, I've had to take it in for service (the other 4 times, the CEL cleared itself after a few days). The first 2 services are described in my earlier post here: https://www.chevymalibuforum.com/for...6-premier.html

I'm hoping the "fuel enriched oil" condition I've experienced won't have too much of a long term consequence.
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post #8 of 15 (permalink) Old 03-30-2019, 05:16 PM
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Re: TSB #18-na-246 2.0t

Not just GM and Honda.. everyone producing a smaller displacement GDI engine is having a HELL of a time with them.
Now Toyota has gone to a port/direct stratified charge fuel injection system.. it's coming to other manufacturers..
I want to retire sooooooo bad..
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post #9 of 15 (permalink) Old 03-31-2019, 10:57 AM
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Re: TSB #18-na-246 2.0t

JL, do you hear of any manufacturers going to a blended MPI/GDI system? Toyota is the only one that I know of that uses it broadly. GM uses it in the Corvettes (I think). Outside of that I don't know who else uses it.

Even after looking for reasons as to why MPI has less of an issue than GDI I still don't fully understand why the situation gets worse with GDI.
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post #10 of 15 (permalink) Old 03-31-2019, 12:12 PM
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Re: TSB #18-na-246 2.0t

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Originally Posted by tnmats View Post
JL, do you hear of any manufacturers going to a blended MPI/GDI system? Toyota is the only one that I know of that uses it broadly. GM uses it in the Corvettes (I think). Outside of that I don't know who else uses it.

Even after looking for reasons as to why MPI has less of an issue than GDI I still don't fully understand why the situation gets worse with GDI.
A gasoline direct injection (GDI) doesn't allow gasoline additives like Techron to keep the intake valves clean. One must use a valve cleaner like CRC to reduce the carbon on the valves from the PCV system oil mist. CRC intake valve and turbo cleaner basically _IS_ Techron, BTW. MPI shoots the gasoline into the intake manifold before it hits the intake valves, keeping them clean.

The only thing additives like Techron, ect, can do in a GDI motor is keep the high-pressure fuel injectors clean, which is a good thing. These injectors are not like MPI injectors and run that run at 60 PSI, The fuel injectors on a Chevy GDI motor run at 2200 PSI, depending on the load factor.
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