Jump to content
CaddyInfo Cadillac Forum

Engine knocking/Ticking


cyrez00

Recommended Posts

Hi all,

a little while ago i placed a post saying i had a engine ticking noise.

At this moment i have not been able to fix this, also to due long lead times in spare replacements out here and not having the right tools.

Initially i was in the assumption that it was one of the valve lifters giving a headache but at this moment i'm not that sure anymore.

When i start the car it runs fine and after about 3 or 4 minutes of running the 'ticking' noise starts to come (distantly)

It get's worse when the car warms up.

As far as i can track it back the sounds seems to come from the right of the engine (seen from the front of the car) somewhere nere the waterpump.

The waterpump has been discoupled so that rules out the pump itself.

I replaced the oil for 10W40 (on recommendation of the local cadillac dealer) but that didn't solve it.

I ordered two valve lifters because i suspected it was one of those, turns out those were slightly different and were of no use to me.

originals will cost me 60 euro (85 dollars) and i will need to buy them per set of 8 so that will not be an option until i am absolutely sure it is one of the lifters.

I have been inspecting them physically when the engine was running and they are all running along just fine, also checked if there was any clearance between the cam and the lifters but there is none whatsoever.

Several mechanics have told me they doubt it will be one of the lifters.

Initially i suspected 2 lifters and replaced them with those 2 i ordered (which were wrong to start with) but this cause the cylinder to miss out and the ticking noise returned anyway so i swapped back to the originals.

The only DTC code i have is P095.

So to sum things up.

Knocking/Ticking starts after a few minutes and gets worse when the engine heats up.

DTC code P095

Can you give your thoughts on above please because i am at a complete loss at this stage.

Thanks for your valued input.

Regards,

Marc.

If you are in complete control..... you are not going fast enough....

Link to comment
Share on other sites


Cyr here is the post you are speaking about

http://caddyinfo.ipbhost.com/index.php?sho...c=16901&hl=

Pre-1995 - DTC codes OBD1  >>

1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm

How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/

Cadillac History & Specifications Year by Year  http://www.motorera.com/cadillac/index.htm

Link to comment
Share on other sites

I find it curious that the ticking noise begins after its warmed up.

Have you checked oil pressure?

Try disconnecting (safely) each plug to see if one quiets the tick, if it is carbon buildup on the piston, or a rod bearing you might highlight it.

Pre-1995 - DTC codes OBD1  >>

1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm

How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/

Cadillac History & Specifications Year by Year  http://www.motorera.com/cadillac/index.htm

Link to comment
Share on other sites

yup!, couldn't seem to find it that quickly... :huh:

Here is the secret, click on your name and click "Find Member's Topics"

Pre-1995 - DTC codes OBD1  >>

1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm

How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/

Cadillac History & Specifications Year by Year  http://www.motorera.com/cadillac/index.htm

Link to comment
Share on other sites

Cyr,

Since the ticking sound does not happen on a cold start, but only after it starts getting warm, have you checked for a tiny exhaust leak?

If there is a small crack in the exhaust manifold or the heat riser, it may cause that.

Posted Image
Link to comment
Share on other sites

Cyr,

Since the ticking sound does not happen on a cold start, but only after it starts getting warm, have you checked for a tiny exhaust leak?

If there is a small crack in the exhaust manifold or the heat riser, it may cause that.

Really? how would that possible then?

Would and exhaust leak cause so many pressure loss that somewhere some metal starts bumping in on eachother?

The noise i'm hearing is clearly a metal tick.

Thanks

Marc.

If you are in complete control..... you are not going fast enough....

Link to comment
Share on other sites

I find it curious that the ticking noise begins after its warmed up.

Have you checked oil pressure?

Try disconnecting (safely) each plug to see if one quiets the tick, if it is carbon buildup on the piston, or a rod bearing you might highlight it.

Ah.. this is a good one! will do that later this week and let you know.

How do i check the oil pressure?

Also, your right with finding it strange that its after warm up, a faulty lifter should be ticking straight from the start?

If you are in complete control..... you are not going fast enough....

Link to comment
Share on other sites

I have a lifter tick and it occurs only on the first cold start in the morning, and then only if that lifter was on an open valve when the engine stopped and it bled down overnight -- about one morning in three or four. A tick or two is normal in the morning with Nortstars but this one keeps on until the engine is warm. Once warm, the engine is so quiet it's uncanny. Open the hood and the noisiest thing is the cooling fans, with the water pump and serpentine belts next. A good ear can hear the steady low buzz of the coils, particularly if you have the beauty cover off and shut off the A/C so that the cooling fans stop. Any Northstar in good shape will be like this; mine was at 116,500 miles when I exchanged it for the remanufactured engine.

Thus my two cents: it's not a lifter. The exhaust leak is a good guess; they sound very much like a metal-to-metal click when the come at the head or the first gasket, the oxygen sensor, or a crack. If you can get a handle on how often it clicks by looking under the hood at idle. Watch the water pump drive pulley, which turns at half engine speed and determine whether the click happens every engine rotation, half engine rotation speed like the water pump drive pulley, or at another rate. If it's every engine rotation or irregular but timed to the engine rotation, the exhaust leak starts looking very good. If it's not timed to the engine rotation, look at the serpentine belt system on the other end. Half engine rotation can be a lot of things. If pulling a plug or shorting a plug wire stops it, it could be a piston pin or piston slap -- or an exhaust leak on that cylinder.

One last thing about exhaust leaks: watch for an exhaust leak at the EGR passage under the intake manifold. This can happen with 1993-1994 model year Northstars but not any other year because the EGR passages are external beginning with 1995.

You can localize the noise by using a long 3/8" socket extension as a stethoscope. Hold the big end of the extension against your ear or cheekbone and press the other against the heads in various places, or even the cam covers, and pick the place that the sound seems closest, clearest, or loudest. If it isn't clear when heard this way, it's probably an exhaust leak, because this method works well for internal engine noises. For example, you should be able to clearly hear the timing chains whirring on the passenger side of the engine. There are better tools for this but using the 18" or 24" socket extension is free if you have one in the tool box, and it works for me.

CTS-V_LateralGs_6-2018_tiny.jpg
-- Click Here for CaddyInfo page on "How To" Read Your OBD Codes
-- Click Here for my personal page to download my OBD code list as an Excel file, plus other Cadillac data
-- See my CaddyInfo car blogs: 2011 CTS-V, 1997 ETC
Yes, I was Jims_97_ETC before I changed cars.

Link to comment
Share on other sites

I find it curious that the ticking noise begins after its warmed up.

Have you checked oil pressure?

Try disconnecting (safely) each plug to see if one quiets the tick, if it is carbon buildup on the piston, or a rod bearing you might highlight it.

Ah.. this is a good one! will do that later this week and let you know.

How do i check the oil pressure?

Also, your right with finding it strange that its after warm up, a faulty lifter should be ticking straight from the start?

You will need to physically attach a gage to the engine at the oil pressure switch, that won't be a fun task, I would remove the oil filter adapter and put a fitting between the switch and the adapter that has the ability to attach a copper or nylon hose to it that attaches to a gage. You would probably be better off with a copper pipe as there is heat in the area from the exhaust manifold.

Pre-1995 - DTC codes OBD1  >>

1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm

How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/

Cadillac History & Specifications Year by Year  http://www.motorera.com/cadillac/index.htm

Link to comment
Share on other sites

Archived

This topic is now archived and is closed to further replies.

  • Recently Browsing   0 members

    • No registered users viewing this page.
×
×
  • Create New...