Remanufactured V6 Engine Misfire

An engine misfire may be found on some GM remanufactured 2.8L, 3.0L and 3.6L High Feature V6 engines immediately after installing the engine. The misfire is usually limited to one bank or one cylinder, often cylinder 5 or 6.

 

The 2.8L engine (RPO LPI, LAU), 3.0L engine (RPOs LFI, LFW) and 3.6L engine (RPOs LY7, LLT, LFY, LFX) are available on 2007-2009 G6; 2007-2010 Aura, Outlook; 2007-2011 STS; 2007-2012 Malibu; 2007-2016 Allure (Canada only), CTS, SRX; 2007-2017 Enclave, LaCrosse, Equinox, Acadia; 2008-2009 G8, Torrent; 2008-2010 Vue; 2009-2017 Traverse; 2010-2015 Camaro; 2010-2016 Terrain; 2012-2018 Impala; 2013-2015 ATS; and 2015-2016 Colorado, Canyon models.

 

If the misfire condition is present, it may be caused by the wrong camshaft installed in the engine at the remanufacturer’s facility.

 

Inspect the camshafts to ensure the correct camshaft is installed in each intake and exhaust position by comparing the ring strategy to either the engine that was removed (recommended) or to the charts included in #PIP5528.

 

Ring strategy camshaft identification is a series of rings along the camshaft that are either simply cast on the camshaft or machined down. There are five rings on each camshaft, which can be identified by the order in which the cast rings (Fig. 20, #1) or machined rings (Fig. 20, #2) are on the camshaft.

 

Fig. 20

 

If the wrong camshaft is installed, either replace the camshaft with the same one from the original engine if undamaged or with a new camshaft. It is not necessary to replace the engine.

 

– Thanks to Aron Wilson

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