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2014 LT program car, Pull Me Over Red, 1.4T Auto
13,525 Posts
I have a 2011 Cruze Eco 1.4L Turbo with 246,000 miles on it. Currently I am getting an engine misfire code and a P0420 code. When I am driving and try to accelerate I can plainly feel the misfire and if it does not stop after a few seconds my engine light flashes and I get notifications saying to service stabilitrack and service traction control. At this point I have tried as much as I can to resolve the issue. I had the catalytic converter replaced because it was completely blocked up and I've replaced the coil pack and sparkplugs. When I replaced the coil pack it ran beautifully for about a month and then went back to misfiring again. I understand that 246,000 miles is a a lot, but I'm kind of frustrated that I can't figure this out. I'm on the verge of just replacing the engine because the rest of the car is in excellent condition. If anyone has any thoughts as to what my issue could be it would be of great help.

Welcome Aboard!(y)

Coil Pack TSB
coil diagnosis video
coil pack fix
coil ground

Tips to ensure no misfires occur:

Remove the coil pack. If the boots are stuck on, use a small screwdriver or pick with some dielectric grease on it to go around the outside of the boot and then possibly the inside of the boot to help aid in removal.

Remember to (p)re-gap your plugs to .028, (0.24 if tuned)

Set gap with the black portion of this tool.

To increase the gap size bend the ground strap up to the desired height. DO NOT LET THE GAPPING TOOL TOUCH THE IRIDIUM CENTER ELECTRODE OR PORCELAIN.

Measure the gap with feeler gauges.

Throw this away.

Torque to 18 ft-lbs with no anti-seize on the threads of a stock type plug.

Ensure the boots have no rips/tears or holes in them, lightly coat them with dielectric/silicone grease and make sure the resister springs are clean and not caught up in the boots when you install them.

If the plugs look bad, consider these:

-BKR8EIX-2668 (iridium plugs), ~$25, expect ~10-15k regaps on these, ~40-50k overall life.
-BKR7E-4644 (nickel/copper plugs), ~$8, expect 15-25K out of these plugs, with a regap or two required at 5-8k intervals on stock tune.

Read Hesitation Gone! for more info on the plugs.

A good replacement coil is the MSD Blaster OEM Replacement Coilpack 8236

Don't forget to introduce yourself and your Cruze here.
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