Silerado Valvetrain noise

**Cool Runnings** · 01-24-2017, 03:18 PM

I was writing just to thank you all for a thread I read on a ticking or tapping noise from engine. The thread said that the oil pick-up tube has an o-ring at the oil pump, if it's damaged will cause the oil pump to send airrated oil to the first lifter causing it to tap/tick. This was exactly right and replacing the o-ring has fixed the problem completely. I can't find the thread any more though? Also a bunch of the other threads say all kinds of bull crap about this problem, is there a good way to know which threads are good and which are bull crap? Newbee.

**pajeff02** · 01-27-2017, 03:27 AM

For most of the common technical questions, the "good" threads have been stickied at the top of the applicable sub-forum.

**Cool Runnings** · 01-27-2017, 02:12 PM

Pajeff02, I've also got an 02 Z-28 so we both have similar cars! Just went over 200,000 on my Z-28 and 240,000 mi on Silverado. Chevy strong!

**pajeff02** · 01-28-2017, 04:36 AM

^^ Very cool! Keep up with the maintenance and these engines will go a long way. Our Suburban has 108,000 on the clock and the Trans Am is at 80,000 or so now.

**Sarge** · 01-29-2017, 10:36 AM

Originally Posted by Cool Runnings

I was writing just to thank you all for a thread I read on a ticking or tapping noise from engine. The thread said that the oil pick-up tube has an o-ring at the oil pump, if it's damaged will cause the oil pump to send airrated oil to the first lifter causing it to tap/tick. This was exactly right and replacing the o-ring has fixed the problem completely. I can't find the thread any more though? Also a bunch of the other threads say all kinds of bull crap about this problem, is there a good way to know which threads are good and which are bull crap? Newbee.

If you have the M code motor AFM it is the AFM lifters. There is a tech bulletin out from GM. The O ring thing is a problem but AFM lifters are the weak point eventually.

**Cool Runnings** · 02-12-2017, 04:44 PM

The IT guys at my work just seem to have blocked me from accessing this site at work so I need to write from home on a kindal which is a little bit of a Hastie. My ac compressor went out last summer on my camaro but I limped through the summer without it, no small feat out here in the desert of CA with temps up to 105 a few times! . I got a new one on line but haven't put it in yet, better do it before it gets hot again. I previously replaced the evap/dryer but the compressor just is worn out. I plan to pull/replace the expansion orifce when I do it and if I find a bunch of crud on the orifice probably my should do the condenser too, right?