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Engine Tick Diagnosis

sicsiksix

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sicsiksix Enthusiast

sicsiksix

Posted
Posted

Just trying to get some more ideas on what is causing my engine tick. I just bought this truck a few weeks back, 2002 GMC Sierra 2500HD 6.0L 4x4 with 56500km on it. Now I didn't notice the noise the day a bought it, then over the next few days it became more apparent. I do have some piston slap in the mornings, but from what I can tell it goes away after a couple minutes of driving. This noise can be heard quite a bit more clearly from the sides of the vehicle rather than over the top of the engine. Its very noticeable at idle and when I snap the throttle under the hood, the noise can only be heard on deceleration. It doesn't go away when the engine is warm either. I tried running some seafoam through the pcv, that didn't do anything. I changed out my oil and filter yesterday and replaced with Pennzoil Platinum Synthetic 5w30. I tried unplugging each coil one at a time and the sound didn't go away, unplugging any of the coils made the engine run a little rougher. I've also noticed a slight stumble at idle when the engine is warmed up. I replaced the PCV, fuel filter, fan belt, air filter, cabin air filters, front/rear differential fluid (royal purple 75w90+white vent plug), transmission/transfer case fluid (royal purple max atf). Im not sure what I should do. I bought the truck from a dealer and have another 3000km worth of warranty on it. Any suggestions? BTW I have a spare 6.0L long block that has been freshly bored/balanced/etc which could go in i suppose, rather fix the one in there though and save the new one for when this one dies.

Rudy35 Enthusiast

Rudy35

Posted
Posted

Could it be an exhaust leak? Check for broken exhaust manifold or studs.

sicsiksix Enthusiast

sicsiksix

Posted
  • Author
Posted

I don't think its a exhaust leak, I had a exhaust leak with my 89 305 and the noise became more pronounced under load. This problem doesn't not get any worse with load. It becomes harder to hear until I let off the gas. It sounds very loud when I'm in a drive through or near a building. But I will check for an exhaust leak tomorrow morning when I start it up. It is supposed to be about -10 celcius so if there is a leak that'd be the time I would be able to spot it.

eldirector New Member

eldirector

Posted
Posted

Sounds like you are describing the same "tick" I hear on mine ('03 1500HD). I believe it is the injectors. Two dealer service centers claimed it was "normal", and I haven't had issues other than the sound, so I've let it go. 70K+ miles, and still ticking away...

sonjaab Senior Enthusiast

sonjaab

Posted
Posted

Injector poppets doing their thing is correct! This noise drove me crazy

on my 01 and 04 6.0s. Dealer said normal. Checked myself with a borrowed

engine stethoscope and sure enough!

 

My 07 6.0 is the same!............geo

sicsiksix Enthusiast

sicsiksix

Posted
  • Author
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I sure hope its the injectors. I actually held a long screwdriver to the fuel rail a few days back and the tick did sound very similar to what i heard. Cant tell for sure without a stethoscope, it's on the top of my 'To Buy' tools at the moment. I am also planning on doing an injector cleaning in the next couple days, and change out my plugs/wires after the cleaning. Hopefully the noise will atleast calm down some. I'll report back as to what happens. Thanks for all the input guys, I really appreciate it, always nice to get some other opinions.

sonjaab Senior Enthusiast

sonjaab

Posted
Posted

Don't waste your $$$$$$$$ on "snake oil" and un-needed parts!

The "tick" won't go away !!!!!!!!!

 

Auto stores and Harbor Freight/tools sell a cheapie stethoscope for

less than $10 bucks..............

sicsiksix Enthusiast

sicsiksix

Posted
  • Author
Posted

Thanks for the advice, I think I am going to purchase a higher quality stethoscope though, The last cheapo one I bought (powerfist crap) didnt last more than a year or so. As for the parts, they are all just my tuneup parts. I always replace as many things as I can when I first get a vehicle to ensure proper performance and longevity. Apprently the fuel filter and air filter was changed just before I got it, but the air filter was black and I could barely blow through the fuel filter. Better to check 'em all now while it still moves before it leaves my stranded.

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