2.5 Timing Chain Noise?

[MountainGoat]

Hey! This is a 1997 2.5l with about 117k miles that I bought with little to no maintenance history. I think that I'm having issues with some timing chain noise, and something to do with spark, but I'm not too sure. It is running a smaller serpentine so that the AC isn't connected to any of the powertrain, but I don't think anything's rubbing on the belt system.

You can hear what I think is a timing chain rubbing and some sort of really high ticking (possibly just the sparks doing their thing) (I think too high to be lifters, but y'all know more than me) coming from the block. Any insight to what's going on here? What I'll need to fix and how urgent it is? Is this a bottle of Lucas and turn up the radio type deal?

 

[Chris]

That could be several things including timing chain noise, lifter noise, or even an exhaust leak.

Couldn't tell you how urgent it is, but if it was my vehicle I'd be looking at fixing that ASAP.

 

[MountainGoat]

That could be several things including timing chain noise, lifter noise, or even an exhaust leak.

Couldn't tell you how urgent it is, but if it was my vehicle I'd be looking at fixing that ASAP.

Any advise on diagnosing? or first steps that won't cost me too much?

 

[Chris]

Any advise on diagnosing? or first steps that won't cost me too much?

Here are some first steps you can take to diagnose the noise without breaking the bank:

Visual Inspection: Start with a visual check of the timing chain cover and surrounding components. Look for any signs of wear, such as metal shavings or leaks.

Listen Closely: Use a mechanic's stethoscope or even a long screwdriver (placing the handle to your ear) to pinpoint the noise origin. Move around the engine to see if you can localize it better.

Check Oil Level and Quality: Ensure your engine oil is at the correct level and in good condition. Low or dirty oil can affect lifters and timing components.

Lifter Ticking: If you suspect it might be lifters, try adding an oil additive that can help with lubrication. Just remember this is a temporary solution.

Spark Plugs and Wires: Inspect spark plugs and wires for wear. A faulty spark plug can cause a ticking noise, especially if it's not firing properly.

Look for Exhaust Leaks: Start the engine and listen for any ticking that may change with throttle. An exhaust leak often makes a distinct sound that can mimic engine noises.

Timing Chain Tensioner: If you can access it, check the tensioner for proper operation. A failing tensioner might allow the chain to loosen, causing noise.

Addressing the issue sooner rather than later is always better when it comes to engine noises, so try to get to the bottom of it! Good luck!

 

[MountainGoat]

Here are some first steps you can take to diagnose the noise without breaking the bank:

Visual Inspection: Start with a visual check of the timing chain cover and surrounding components. Look for any signs of wear, such as metal shavings or leaks.

Listen Closely: Use a mechanic's stethoscope or even a long screwdriver (placing the handle to your ear) to pinpoint the noise origin. Move around the engine to see if you can localize it better.

Check Oil Level and Quality: Ensure your engine oil is at the correct level and in good condition. Low or dirty oil can affect lifters and timing components.

Lifter Ticking: If you suspect it might be lifters, try adding an oil additive that can help with lubrication. Just remember this is a temporary solution.

Spark Plugs and Wires: Inspect spark plugs and wires for wear. A faulty spark plug can cause a ticking noise, especially if it's not firing properly.

Look for Exhaust Leaks: Start the engine and listen for any ticking that may change with throttle. An exhaust leak often makes a distinct sound that can mimic engine noises.

Timing Chain Tensioner: If you can access it, check the tensioner for proper operation. A failing tensioner might allow the chain to loosen, causing noise.

Addressing the issue sooner rather than later is always better when it comes to engine noises, so try to get to the bottom of it! Good luck!

That's some really great stuff to start out with. Thank you! I'll go out and check those out. I'm praying that its not lifters, but we'll see.

peace

 

[PNW_LJ]

Sounds like the chain tensioner may have failed. Better take care of it asap as the chain will soon fail and leave you stranded (thankfully it won't kill the engine).

Try putting a socket on the crank, and feel if there is some slack when you turn it.

 

[MountainGoat]

Sounds like the chain tensioner may have failed. Better take care of it asap as the chain will soon fail and leave you stranded (thankfully it won't kill the engine).

Try putting a socket on the crank, and feel if there is some slack when you turn it.

There turned out to be a good amount of play. I borrowed an old stethoscope from a friend and found that the timing chain is almost definitely the source of the noise.

I haven't found a great guide for a 2.5 timing chain replacement, so I'll do what i can to get a good one together. Thanks for your help!

 

[macleanflood]

I thought the 2.5 has a timing belt?

No chain...

-Mac

 

[JKP]

2.5L has a chain.

2.4L has a belt.