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[Andys VXR]

My car has a slight tapping sound when ticking over but it sounds to deep a ticking to be tappets but not so deep to be big end those of you that have messed around with cars for years will know what i mean . Right the problem is that every now and then it goes really quiet and sounds how it should sound then it will come back as and when. Ive tried the under load test you know put it in gear hand brake on and slowly let the clutch up to see if it makes it noisier and it dosnt.ITS A 3.2 MANUAL 150.000 miles

[tango]

have you tried an oil change
youd be surpised what it can do

[Andys VXR]

Yes new oil last week no difference. I might change tappets summer time how long would it take to do i know ive got to take cams of just a rough idea. It seems to be drivers side .

[05omegav6]

Before condemning it, add some Wynns Hydraulic Lifter Treatment, works a treat

Also what oil did you use? If the engine has done a few miles it might not appreciate 5w30 as it's relatively thin compared to the 10w40. I put the 5w30 in mine for the first time at 160k and it rattled like a bastid.

Went back to 10w40 with lifter treatment and much quieter (misfire aside) .

[Marks DTM Calib]

If it was the little end I would not expect it to dissappear at all.

[Andys VXR]

Yes its 10-40 oil in there and yes i was thinking if its small end it wouldnt go away . Now ive heard some people say lifter treatment is great and some say it not worth it. Anymore yes or no on this treatment much appreciated.

[tigers_gonads]

All depends on if it is your lifters and if so, how gummed up they are 

Sometimes, a few quick oil changes (500 miles ish) can clear it.

As for pulling the lifters out, its plenum off ............. rocker covers off ........... cams out and them a magnet to get the little buggers out 
Stick them in a vice and give them a squeeze to get the crap out.
Re build then see how it goes 

If your cam cover seals are a few years old, you might want to budget for a new set (get Vx ones or you will end up doing it again in the summer  )

Hth

[Kevin Wood]

I would pop off the cam covers and see if any of the lifters can be compressed by hand for starters. No need to remove the cams to try this. It's almost impossible to diagnose noises remotely but lifters are by far the most likely scenario, and I've been surprised in the past how noisy they can be if they fail properly.

Worth trying lifter treatment first though.