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Codes P0405, P1516 and P2101, knock in top end?

Tiny
ED&DESI
  • MEMBER
  • 2007 CHEVROLET EQUINOX
  • 3.4L
  • 6 CYL
  • AUTOMATIC
  • 140,000 MILES
We replaced the rocker arms and lifters changed oil and filter it still has knock in the top end but drives fine. The codes that come up are P0405 P1516 and P2101, what else could be the problem?
Thursday, August 10th, 2023 AT 5:48 PM

5 Replies

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 48,363 POSTS
It sounds like you may have carbon on top of a piston which is common, if you upload a short video of the noise I can tell for sure. Please go over this guide

https://www.2carpros.com/articles/understanding-and-repairing-engine-knocking-noise-an-in-depth-guide

P0405 - Exhaust Gas Recirculation (EGR) Sensor A Circuit Low:

P1516 - Throttle Actuator Control (TAC) Module Throttle Actuator Position

P2101 - Throttle Actuator Control Motor Circuit Range/Performance:

None of these codes will create an engine knocking sound. Please upload pictures or videos of the problem so we can see what's going on.
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Friday, August 11th, 2023 AT 11:43 AM
Tiny
ED&DESI
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That is with the back value cover off.
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Friday, August 11th, 2023 AT 2:39 PM
Tiny
KEN L
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It looks like the spark plug wires could have been installed incorrectly. Can we please double check it?

Firing Order. 1 - 2 - 3 - 4 - 5 - 6

Check out the images (below). Please let us know what happens.
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Saturday, August 12th, 2023 AT 9:16 AM
Tiny
ED&DESI
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  • 3 POSTS
They are In the right place.
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Saturday, August 12th, 2023 AT 12:33 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 48,363 POSTS
You might have a head gasket blown between two cylinders, let's do a compression test to see what's going on.

https://www.2carpros.com/articles/how-to-test-engine-compression

Please go over this guide and get back to us.
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Monday, August 14th, 2023 AT 10:53 AM

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