Our 2.4L hybrid has about 35k miles. Car runs and looks like new.
The Terrain forums have a lot of info on the 2.4L engine. These things are uber-sensitive to DEXOS oil which is clean and always full. Some of my notes (which may not be relevant to the Lacrosse):
Some
timing claims that may impact us:
- the timing chains CAN have a long life but get killed very quickly by low oil
- the
tensioner apparently was improved, and the
new part number is less prone to failure.
- the plastic guides break easily, shortening the life of the chains
- a
timing guide bolt tends to fail (or loosen up), damaging the timing chain. An
improved design is made by Melling or Dorman (see links below). I'm not 100% clear if installing this requires resetting the timing chain tensioner, which would require some disassembly. In anycase, it is easy to check if the original bolt is coming loose.
This solution saves hours of labor and hundreds of dollars in replacement parts that would otherwise be required to remove the cylinder head to remove the old bolt
www.dormanproducts.com
The
high pressure fuel pumps don't seem to last too long. Gasoline will dilute the engine oil and cause other rich issues. Sometimes a code will pop up. We had no codes but discovered the problem as oil level was rising (and smelled like gasoline). The stainless hose is one use only so needs to be replaced too. We changed oil right after replacing HPFP. Engine runs much quieter with new pump.
The
cam solenoids get too hot, so they have short lives; replace BOTH
intake and exhaust at the same time which are different parts, use only OEM parts. An engine code for exhaust solenoid popped up for us. Car ran much smoother after change.
Forums indicate the failure can be intermittent. and is from hot placement on top of engine. Both solenoids bench tested fine at room temperature (around 10 ohms resistance, no visible damage, seemed to operate correctly with 12v bursts).
The
tiny PCV hole is hack engineering. When it clogs with carbon, I don't know all the symptoms, but maybe include:
- Increased oil consumption
- Rich operation so increased fuel consumption
- In cold climates, water in PCV piping and holes can freeze up; the pressure in the engine needs to go somewhere, and tends to blow rear main seals, leaving the engine without oil. The official fix seems to be to remove the
intake manifold, clean-and-overdrill the PCV hole (see TSB above). I have seen techs blow some cleaner to make sure the (4?) channels are clear.
Removing the
intake manifold is not so easy on the Hybrid model (I think there were the generator and hybrid, cooling and high voltage parts blocking the manifold but can't remember). Our local library stopped stocking Alldata and we couldn't find full instructions on the internet, so we still haven't serviced that PCV hole.
In cold weather, I have seen some other techniques to try to prevent busted rear main seal.
- catch can. Not sure if one needs clean side, dirty side, how to pipe, or if these help or hurt. They need to be emptied periodically.
- I saw one guy install a brass fitting outside the plastic manifold so he can clear the pcv hole with a paperclip without removing the manifold. It is difficult to drill the delicate plastic manifold without breaking it.
- the FC219 oil cap to try preventing rear main seal failure. Not sure if that is approved by GM for the LaCrosse and it's use is controversial.
I have a 2010 NOX that just had this exact problem, but GM says the VIN does not apply :angryfire:. Regardless, I didn't see it on this forum, so here is a copy/paste of the TSB: https://static.nhtsa.gov/odi/tsbs/2015/SB-10057696-3071.pdf Bulletin No.: 14882 Date: March 2015 SPECIAL COVERAGE...
www.terrainforum.net
Hi all, new to the forum. I inherited a 2010 Terrain that has had the oil consumption repair done in January and a new transmission in February. After some research on this forum, I decided to add a vented oil fill cap and ordered one off amazon. All of the ones I’ve seen have had black...
www.terrainforum.net
