Most common is cylinder misfires but you’ll also experience decreased performance, rough idling, loss of power, etc. This causes a loss of compression in the cylinder which will lead to a myriad of performance problems. When a valve seat wears down, the valve doesn’t fully seal when it is closed. Therefore, this problem usually continually worsens until you begin to experience all of the symptoms below. While this doesn’t happen overnight they tend to wear down over time. The heat from the valve is expected to be the reason for the valve seats going bad on these cylinders. Since the EGR valve recirculates exhaust gases, the valve itself gets very hot. The EGR valve sits right in front of two cylinders. The purpose of the seat is to complete an airtight seal between the cylinder and the head, maintaining compression within the combustion chamber. Valve seats are the portion of the cylinder head where the valve sits when it is closed. While you can actually see it with the hood open, accessing it requires removing a number of other components which makes it about a 4 hour DIY. The part is about $100-$150 itself but requires some labor to access it. Ultimately the only way to fix the issue is by replacing the fan clutch.
With that being said, while most of these problems are small on these engines, they are also pretty common. The engine was built quite well and don’t commonly experience any serious issues that can lead to catastrophic failure. Cylinder sleeves (2002 TrailBlazers only)Īs you can tell based off of the problems mentioned above, there really aren’t any major problems faced by the 4.2 Vortec.This platform was one of the most diversely branded being featured under every GM brand with the exception of Cadillac and Saturn. GMT360 is the chassis code, or platform, that all of the below vehicles were manufactured off of. The 4.2L straight-6 was used exlcusively in GMT360 vehicles. When this plant closed so did the production of both the Vortec 4200 and the vehicles it was included in. The engine and the GMT360 vehicles were produced in GM’s Moraine, Ohio plant. While the LL8 made it on Ward’s 10 Best Engines list 4 years in a row from 2002 until 2005, it was ultimately phased out in 2009. Despite its respectable power for its size, the LL8 4.2 Vortec was only offered in mid-size vehicles that were part of GM’s GMT360 chassis platform. Throughout its lifespan the engine produced power levels ranging from 270-291hp and 270-277lb-ft. It features a dual overhead cam design, 4 valves per cylinder, and variable valve timing for the exhaust cam. The 4.2 Vortec is an inline, or straight, 6-cylinder engine produced from 2002 until 2009.
#SURGE 2 HAS IT CRACKED CODE#
The 4.2L engine was produced under the engine code LL8. The Atlas engine family is a group of inline 4, 5, and 6 cylinder engines produced from 2002 until 2012. Despite it’s “Vortec” name, the Vortec 4200 is actually part of the Atlas engine family, rather than the LS-based small block family.
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