Lifters noise

[Faustof]

Got it. Listened to your video again, def sounds like pass side perhaps either #2 or #4.

How long ago was the work done?

Have you done a compression test yet?

Only 1 week. No, no compression test done.

 

[NickTransmissions]

Yes, the kit I bought came with lifters, camshaft, trays, but I didn't change the knock sensor. Yes we adjust the valves .

What kit did you buy?

 

[Faustof]

What kit did you buy?

From Ebay, 300 dlls . Not original. The oddnes is that when I start cold there is no noise.

 

[NickTransmissions]

From Ebay, 300 dlls . Not original. The oddnes is that when I start cold there is no noise.

Hmmm...Where were the parts made?

What are the cam specs and did the kit come with pushrods?

Also, pop the valve covers off and turn the engine over by hand to see if anything looks "off" when each of the rocker arms open and close the valves.

 

[Faustof]

Hmmm...Where were the parts made?

Also, pop the valve covers off and turn the engine over by hand to see if anything looks "off" when each of the rocker arms open and close the valves.

USA. Will tell the mechanic

 

[NickTransmissions]

USA. Will tell the mechanic

Oh, thought you did the work. Id take the whole truck back to the shop and let them diagnose and fix it under warranty.

 

[Faustof]

Oh, thought you did the work. Id take the whole truck back to the shop and let them diagnose and fix it under warranty.

Well He is My buddy, and Lost the same as me. Thanks a lot.

 

[NickTransmissions]

Well He is My buddy, and Lost the same as me. Thanks a lot.

Please keep us posted on what you/he find once you dig into it.

 

[Geotrash]

To my ear, you have one lifter that’s knocking pretty good - both on initial startup for a few seconds, and also when warm. The fact that it doesn’t do it while the engine warms up makes me suspect that you have a lifter that is either bleeding down too quickly or not pressurizing fully as the oil warms up and its viscosity drops.

If I’m right, then unfortunately those lifters will need to come out again before it damages the cam.

If you take them out, replace them with either GM LS7 lifters or Morel 7717. I believe that Melling is the OEM manufacturer of GM’s lifters so you may find a set of those for a reasonable cost as well. Most important of all, throw those eBay lifter trays in the trash and replace them with genuine GM trays only. The cheap trays won’t hold the lifters firmly enough:

 

[TNBob]

Hi, I have an 2007 Tahoe with 180,000 miles. As common I had a lifter/cam issue. I perform the AFM Delete (change all 16 normal lifters and regular camshaft and re-program to dissconect the AFM on the computer).

I been having low pressure problems . I already change the oil pump and double checked the O ring on the pump.

When is cold the pressure goes over 40 (normal) and the engine sounds great. But when it warms up the oil drops under 20 and the lifters start to make noise.

Any help will be appreciated.