Anyone else have this issue? A rattle I did some research seems to be a problem with the x100/150 with the rattle from cold start. It’s there for maybe 2 seconds and clears itself up. Usually happens when the car sits for 2/3 hours or overnight and only a cold start

 

Sounds like worn timing chains or faulty tensioners/guides.

 

Has the oil filter been recently changed?

 

Yes, just did oil and filter change so it was doing it before and after, I changed the oil and filter
Castrol 5w30 Edge Advanced full synthetic
Motorcraft FL2021 oil filter
Oil is at full mark

 

How many kilometres/miles are showing on the odometer?

Has anyone removed the cam cover(s) to inspect the timing chain tensioners? I have seen the secondary timing chain tensioners fail on the AJ33/34S.

 

165,783 miles, and no haven’t removed valve covers

 

I haven’t checked timing chain tensioner, but does the belt tensioner going bad make a similar sound like this? Just curious, the car was sitting and the belt was squeaking when I started it up last week for a while but it went away but don’t know if this noise could be that cause

 

Remove the belt start engine and see if it sounds different?
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+1 on removing the accessory serpentine belt to eliminate those components as a source of the noise.

Remove the cam covers and inspect the primary and secondary timing chains, guides and tensioners. If the secondary chain is slack, there may be groves worn in the cylinder head casting.

Use a borescope to inspect the primary guides as they can fail with pieces falling off into the sump.

 

Listen to NBCat as what he says is no joke!

Here is where it will progress if ignored. This is a 3.9L Lincoln LS engine but it is the same engine family as the Jaguar 4.0L/4.2L V-8's.



Also note the dark staining inside the engine a sure sign of lack of oil changes too! The oil has been baked into the Aluminum.
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I appreciate everyone chiming in, looks like this will be my project once I’m back from Thanksgiving vacation!

 

Had the same problem, one bad VVT. Had both VVT's and the timing chains replace at Swallows Jaguar in Somerset cost a little over £3k.

 

To avoid the possibility of failed VVT units, it's vital to change the oil regularly, and to use the correct viscosity oil. The VVT units become very cross if the incorrect viscosity oil is used.

 

Very glad I looked at this posting. Didn’t realize we have plastic tensioners on the 4.2L’s, as well as this sort of failure.

Out of curiosity, what would be the recommended time to change the timing chain components as well as VVT Solenoids?

I’m rapidly approaching 85,000 miles and am fairly certain this job has not been done on my 06 STR. I frequently change the oil, every 3,000 miles since I’ve gotten the car at 60k, but want to be extra cautious and ensure the engine lives a long and happy life.

My XJ8 which had the none supercharged 4.2L V8 had 232k miles before it was rear ended and totaled.

 

The best method to tell the condition of the timing chains and associated parts is to remove the cam covers and visually inspect the components.

I have seen the secondary timing chain tensioners fail on the AJ33/AJ34 where the plastic sliders become cracked or dislodged from their position causing the chain to go slack.

 

I thought at some point jaguar used metal tensioners at the factory. Is this true and if so when

 

Here is an example of an AJ28 with the updated secondary timing chain tensioner fitted. As can be seen in the photo, the body of the secondary tensioner is metal, however the slider that contacts the timing chain is plastic. I have seen the plastic separate from the tensioner and fall off allowing the secondary timing chain to become loose.

 

Yes, the factory did switch to the metal bodied tensioners in early 2002 on the 4.0 litre engines. All the 4.2 AJ33/AJ34 engines had the metal tensioners installed at the factory.

 

Maybe the rattle comes from the VVT or timing chain (& tensioner & guides). Quite possible, yes. BUT to get addl, confirmation of that: Use the mechanic's stethoscope (a huge screwdriver), hold the grip onto your ear and the metal end to various positions, where you think the rattle is coming from (obviously do not get caught in moving parts like the drive belt).
If you can confirm, that the rattle comes somewhere from the timing chain, your previous assumption is correct. HOWEVER, I'd like to throw it out the there in the ring that it could be something completely different. I suspected my timing chain on my X308 all along and never thought it could be something else. The rattle was there for about 10 seconds after initial start of the engine, and then gone. I swapped chain, tensioners and guide. Rattle was still there, BECAUSE to was one of the catalysts! The honeycomb in one of the catalysts was falling around completely loose inside of its housing. I found this unbelievable fault by using the mechanic's stethoscope. Hence, I swapped both catalysts and the rattle was gone.

PS: I just realized that you have an STR, hence, a V8, which would be pretty much the same engine as in my X308 (apart from the "R" part)...

 

thanks. I might be in your area soon. Golf at pelican hill