I have a 2007 chevy Z71 1500 with 5.3 V8. I was wondering if there was any way to bypass cylinder deactivation to leave engine in 8 cylinder mode. I recently replaced # 7 cylinder lifters due to lifters not getting oil in 4 cylinder mode. I can see this will be an ongoing problem and can not afford …

That is controlled by the ECM. There should be a tuner calibration out there to give you 8 cylinders all the time. However that will kill your warranty and fuel economy.

Where would I find a tuner calibration? Truck has 116000 miles so already out of warranty.

Search under Chevy performance calibration. There are companies that sell you a module that you use to load their cal. The module also stores your original cal in case you need to go back. The company doing this for Dodge 6.7 Cummins is called bully dog.

Thanks just emailed bullydog to see if they could help.

Hi, I’m new to these forums, and more than 20 years has separated me from the automotive field, but maybe some one could explain how cylinder deactivation is tied to engine lubrication? I would have thought that engine lubrication would continue as normal regardless of how many cylinders are firing…

De activation leads to low temperatures and generally the moisture accumulates and lets the crud build up. If you operate under low loads for short times, this will happen to every engine. However the deactivation makes it worse. It would help if they rotate the firing cylinders so the temperature …

Ahhh, gotcha. I hadn’t considered temperature differentials with only half the cylinders firing. I should have thought about that, since I’m an IT professional. Modern day multi-core processors use a balancing act to keep all the cores working to prevent such temperature differentials, and that m…

My question is how do you really know that was the reason it failed. Was this a mechanic’s theory? Mechanics pull all kinds of stuff out of their #$$ to explain problems.

I apologize in advance for this comment but cannot resist, so here goes: Tim hats are complementary with straight pipes, so is a big machine gun and a lift kit. Did you know that they also sell a resistor for the diesel Mass Air flow sensors so you can “make smoke”.

Cylinder deactivation

Maintenance/Repairs

FoDaddy April 24, 2010, 7:12pm 10

As others have said a tuner will allow you to turn off the cylinder deactivation. All the people I know with vehicles that have this feature ( mostly people with newer Dodge Rams )turned it off shortly after having their exhausts done ( straight pipes out the converters), apparently when they switch to 4 or 6 cylinder mode the engines sound ridiculously wimpy.

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Cylinder deactivation

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