Hey guys

[Aricosmogirl]

hey guys its been awhile since i been on, hard to pick up extra shifts for work to pay for things for the truck. So in my previous post i was asking if anyone knew what the cause of the ticking in my truck when i accelerated was. Well some people said exhaust leak could be the cause an to my knowledge it wouldn't pass smog if it was exhaust leak. I could be wrong, but i get it smogged today an the mechanic said while he was doing the smog its a possibility it could be the lifter. Hes not too sure without expection, which i couldnt afford to do today. But can someone explain why the lifter would be the cause, an if its something to be worried about? More information on the lifter would be much appreciated. Thanks guys!

 

[alwaysFlOoReD]

I'm not a pro but you can do some investigation yourself. A ticking under accelertation sounds like an exhaust leak to me. It will also be noticeable at idle if you listen closely. You can use a short length of garden hose, one end to your ear, the other probing around the exhaust manifold to head and exhaust mani to the crossover pipe. To hear if a lifter is ticking, use a stethescope [preferably] or a long piece of pipe or screwdriver, holding one end against the rocker cover and the other end cupped in your fist against your ear. Move the rocker end of the pipe/screwdriver around until you find the tick. You can then decide what you want to do. The 2.9l motor is famous for lifter ticks and most do nothing about it with no real problems. I'm not familiar with the 3.0l tho.
Good luck,

Richard

 

[Aricosmogirl]

Thanks for getting back to me. Im going to have to do that an let you know. last time we checked it the sound sounded like from the back of the engine. An if its the exhaust leak wouldnt it have no passed smog? Im just asking cause im not sure. But thank you an ill look into that.

 

[RonD]

The cam shaft is in between the heads on a 3.0l, in the block under the intake manifold.
The lifters(one for each valve) sit in holes above the cam, each lifter rides on it's own Cam Lobe, so goes up and down with the cam rotation.
Sitting on top of each lifter is a Push Rod, the Push Rods run up thru the head and push against the Rocker Arm for a valve.
So Cam turns, Lifter goes up, Push Rod goes up, Rocker Arm goes up, Valve opens.

The 3.0l uses Hydraulic Lifters, this means inside each lifter is a couple of springs and a valve.
The hole each lifter sits in above the Cam also has an oil passage pressurized by the oil pump, when Lifter is not "up" oil flows inside the lifter thru a one-way valve, when Cam pushes Lifter "up" the springs compress and the oil inside is forced out thru the Push Rod(Push Rod is hollow) and up to the Rocker Arm where the oil is used to lube the contact points on all this metal to metal rubbing.

If the Lifter springs break the lifter doesn't open back up all the way after pushing the valve open, so lifter is now "shorter", so Push Rod isn't quite touching the Rocker Arm, this gap makes the "tick, tick, tick" sound.

The valve in the lifter can fail, this cause a suction that can prevent the lifter from opening back up, so same as above, gap at the Rocker Arm and "tick, tick, tick" sound.

These would usually be more noticeable at low RPM, because of lower oil pressure, as oil pressure goes up ticking would lessen.

Fuel injectors make a "tick" noise, I would give a listen to those at idle, see if you hear one that is louder than the others.

 

[Aricosmogirl]

Alright thank you ill check that out an see what it could be. Than ill get back to you about my findings. Thanks again guys

 

[Aricosmogirl]

Hey guys i made a small video of what it sounds like, maybe that could help a bit. This is my first video ever put up, so if its bad im sorry. When i took a look at the truck today the sound was behind the engine on the drivers side. Tried looking with a light to see anything moving or broken an couldnt see anything so hope this video helps.


http://youtu.be/7AcBIhmwRU4

Thanks guys.

 

[RonD]

Yes video post worked well, but hard for me to tell in that video, can't quite hear it, too much fan noise I think.

But if I had to guess I would say exhaust leak, only because of the timing of the "tick".
When you first accelerate back pressure builds up between Cat converter and exhaust manifold, just a momentary thing, as you describe.
If you have someone put their hand over the tail pipe and you start to hear that "tick" then it is an exhaust leak.


Another ticking type noise can also come from spark plug wires.
Visually inspect each one for cracks.
When it is dark, open the hood, start the engine, and have someone rev it while you watch for blue spark along the spark plug wires.
This jumping spark can often cause AM radio interference, which is another test you can do.

 

[ugltrk]

Sounds like timed too high...Does it do this in a load situation? Like when you need to shift to a lower gear, but make it pull back to speed without shifting. Could be bad gas.

Bill

 

[Aricosmogirl]

Hey guys sorry I been away from the forum for awhile. So from what I heard it's the lifter. But it used to make the noise only when I accelerated in the truck, but not it's making that loud pinging sound just idling. So idk it seems like it's getting worse. Is this something I should be concerned about? Thanks guys.

 

[RonD]

Might be time to pull the valve covers and check which push rod is loose(the ticking) and why

 

[Aricosmogirl]

Hey guys sorry really late. We had my truck looked at an taken all apart an two mechanics couldn't figure out why its making a ticking sound. So idk what's wrong.

Sent from my Nexus 4 using Tapatalk

 

[alwaysFlOoReD]

That sucks. Sounds like they are mechanics in name only.

Richard

 

[RonD]

Maybe you needed a doctor first ........someone with a stethoscope to at least localize where the noise is coming from.
Most mechanics, well all really, will have a method to localize a noise before trying to repair it.

A DIYer, like me, might just jump in without doing that, but my hourly rate is FREE, lol

You pay a mechanic a high hourly rate to do repairs, because you are reimbursing them for what their education cost, actual class cost and/or unpaid time they spent learning, same as Doctors and Lawyers.

So it is odd that out of two neither would be able to ID the issue.

At least they shouldn't charge you for an inspection

 

[Aricosmogirl]

@alwaysfloored & @RonD no their very experienced mechanics so it was a surprise to not find anything. They checked bearings, wrist pins, crank shafts, exhaust manifold, and tranny. Basically anything that may be the cause for the ticking. If I could take apart the engine myself I totally would. I hope it lasts a little longer.

Sent from my Nexus 4 using Tapatalk