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11-12-2013, 01:14 PM #1
Head/Valves (Engine?) Ticking at high RPM/speed
Hey guys, I have come to the board under concern for my truck and this weird noise it makes (or has been making) when it goes into a high RPM/speed situation, such as when overtaking on the highway or when merging into the highway at moderate to high RPM's.
The head (valves? engine?) would make a ticking sound that i found horribly concerning, almost as if i increased the rpms any higher the engine would simply throw a rod or spin a bearing. But i wasnt really at redline or even pushing the engine that hard, In my opinion. 3500-4500 RPM.
This had been the norm, and so i rarely put the engine to its limits so i wouldnt have to hear that noise, it was audible from inside the cab, without the radio on and was 100% RPM related. As it would never happen when the engine was at a lower RPM only whenever I pushed the Automatic transmission to downshift and cause it to roar to life, then the ticks would appear.
Fast forward to this november and I noticed that under intense, very intense RPM's nearing redline 5,000 RPM or so, the engine is no longer making this noise, and Im not sure if its a change in oil brand, I recently switched from Pennzoil to valvoline and I commonly use whatever is on special so many different types of non-synthetic oil have been in my truck. (i may start sticking with one brand to try and eliminate factors here) also, I had a water pump issue which has been resolved, and the radiator fluid has been flushed and changed so with that and the cold-ish weather (here in Houston, TX) the truck has really been top notch lately, and the absence of the noise had me concerned about what might've been going on in the past.
Could it have been a temperature issue? oil issue? combination of both? The engine is running super strong, just @ 125,000mi I really wish I knew whether i had the canadian CASATECH heads so I could know whether I've got a serious problem headed my way, or whether Im safe for the time being.
Just sorta thinking out loud here about a problem that has since stopped but still very curious why it started to begin with, i know engines tend to be noisey at times, especially in instances where its the dead heat of summer under heavy load and that the same engine load during a moderately cool night may have different results regarding a suspicious noise...
11-12-2013, 02:08 PM #2
- Join Date
- Nov 2013
It could very well have been the water pump. The higher the RPM, the faster the water pump spins. ( or any accessory, for that matter) if the noise went away, I wouldn't be too concerned. It's hard to diagnose something that is not there.I like all dogs I meet, and some people too.
11-12-2013, 05:02 PM #3
A ticking sound that changes as rpm changes could be a lifter. Our value lifters (hydraulic) use oil to keep them inflated. As a lifter wears, the oil leaks out causing the lifter to collapse before the valve is fully opened. Sometimes the leak is caused by wear, sometimes the leak is caused by a piece of dirt trapped inside the valve. If yours have stopped "ticking", the different oil could be providing a better seal, or, the new oil may have moved the piece of dirt. Either way, the lifter is working.Ray
'09 Avalanche LTZ - Black
'05 Envoy XL (sold)
11-12-2013, 07:41 PM #4
1995 Silverado 4x4
6" BDS Suspension Lift-3" Body Lift-Add A Leaf in rear -Trailmaster SSV Shocks-Duel Steering Stabilizer Kit -AirAid Cold air intake-
4.56 Gears with Detroit Auburn Locker-Pro-Comp Traction Bars with duel shocks-Aluminum Skid Plate Kit-38.5" x 16.5" Mickey Thompson Baja Claws-Constant Dropping fuel gauge
2005 Yukon XL Jet Power Programmer, Bilstein Shocks, Bilstein rear springs, Helwig Anti-sway bars, EGR Window Visors, EGR Hood Shield, Denali Headlights, Headlight harness upgrade, GE NightHawk Bulbs, White Night Rear lighting system http://www.gmtruckclub.com/forum/sho...5-GMC-Yukon-XL
2002 Silverado ext cab 2wd (Sold)
2003 Yukon XL (Totaled)
11-13-2013, 08:19 AM #5
your ticking under high load is most times pinging . with the coolant system/water pump replaced and with no coolant leaks the coolant should properly cool the system .. with higher than the proper temp of the engine then you will get this pinging. also the KS will throw back timing so that you loose a lot of MPG.
with no coolant pressure the coolant will boil ...then the temp surges upward.
if your lifters where bad/not working correctly this ticking would be at the low rpm / idle ..
11-17-2013, 03:23 PM #6
temps heated back up in houston today into the low 80's it seems that anything over 70 degrees causes this ping or tick at high speed RPM to return.
i might add that my CEL is on currently for a knock sensor issue (water in the intake) but this problem has been happening years before the CEL came on.
Last edited by Bowtied; 11-17-2013 at 04:10 PM.
11-17-2013, 05:11 PM #7
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