Clicking from the back of the engine

[SeeNoWeevil]

 

Clicking coming from the back of the engine in time with engine revs, PSSHTTT of air as I blip the throttle from around the same place.

 

Leaking exhaust? Fuel damper? Kinda worried. Help!

[evest]

Sounds like an air leak to me. Have tou had any work done or had the plenum off? Pass some tissue around seals near the sound to see if catches any escaping air.

[SeeNoWeevil]

Sounds like an air leak to me. Have tou had any work done or had the plenum off? Pass some tissue around seals near the sound to see if catches any escaping air.

Cat-back exhaust fitted fairly recently.

[evest]

Could be a dicky gasket then, but unlijely and wouldn't think you'd hear from above the engine bay. Are you able to pinpoint the source?

[SeeNoWeevil]

Could be a dicky gasket then, but unlijely and wouldn't think you'd hear from above the engine bay. Are you able to pinpoint the source?

I'm on my own at the moment so it's kinda difficult to blip and listen but it's very obviously from around the back of the engine. The PSSHT isn't normal induction noise for a Zed I take it?

[evest]

It is if you have an aftermarket style intake! Otherwise sounds like air escaping from somewhere as it's being sucked in, and the clicking noise is probably air escaping in time with the engine turning over. Could be the gasket between the upper and lower plenum. Check all your hoses and jubilee clips and see if you can track down the clicking noise

[SeeNoWeevil]

It's a stock intake.

 

Clicking noise is definitely from around the Fuel Damper, which I believe is this thing?

 

 

More worringly, there's a knocking which is loudest around the front, rightmost tensioner.

[evest]

If you're on high mileage then it possible that the timing chain tensioners have extended far enough to cause a noise/knocking whilst idling. I think a few folks have now gotten to the point of replacing the chain.

Not sure what what to advise on the fuel dampener though.

[evest]

If your fuel dampener is faulty, i noticed there is one for sale over on the trading post post...

 

http://www.350z-uk.com/topic/103679-fuel-dampers-fuel-rail/

 

Ah sorry - been sold! But the thread did mention about the ticking sound.

Edited October 2, 2016 by evest

[SeeNoWeevil]

Thanks for the help. Car is on ~60K. Will take it to Nissan tomorrow, fearing the worst

[ZEUS]

Don't take it to Nissan they will have your pants down, go to a specialist on here. Where abouts are you located?

[SeeNoWeevil]

Don't take it to Nissan they will have your pants down, go to a specialist on here. Where abouts are you located?

Devon. I don't think I have much choice sadly. Edited October 2, 2016 by SeeNoWeevil

[mouthwash]

http://www.350z-uk.com/topic/104039-vq35de-rev-up-engine-ticking-noise/

[SeeNoWeevil]

http://www.350z-uk.com/topic/104039-vq35de-rev-up-engine-ticking-noise/

Yeah, I think I've read every damn topic re. tapping zeds. Thanks though.

 

If it's major valve issues I'm going to cry. The car gets absolutely babied and top quality oil every 5k/levels checked with obsessive regularity (it doesn't use a drop).

 

 

[mouthwash]

Surely it's worth getting that changed first with a good one from ZMANALEX rather than having your pants pulled down at Nissan?

[SeeNoWeevil]

Surely it's worth getting that changed first with a good one from ZMANALEX rather than having your pants pulled down at Nissan?

 

Yeah, I think you might be right.

[SeeNoWeevil]

Fuel Damper hasn't cured the tapping. Gutted. No idea what to do with it next.

[mouthwash]

The engines always do make a fair bit of noise, is there another 350z owner in your area? If not go and look at a couple of 350z's on garage forecourts and see what they sound like.

[SeeNoWeevil]

The engines always do make a fair bit of noise, is there another 350z owner in your area? If not go and look at a couple of 350z's on garage forecourts and see what they sound like.

Yeah, the garage that looked at it had the stethescope on it and said it was definitely internal, camshaft area, passenger bank.

[SeeNoWeevil]

 

[SeeNoWeevil]

At a real loss with this. Car is being looked at but no one can find the issue. It took quite a while to replicate it, sounds normal most of the time.

 

 

Only happens when hot, but not always.

Can restart the engine and the noise is gone

Noise sounds to be coming from the front cylinder (check with stethoscope)

Plugs checked

Cylinders checked with borescope

Conrod bearing seems ok

No fault codes

Disabling injector on cylinders in turn on passenger bank, noise doesn't stop

No damage to camshaft or valve followers

Valve clearances are perfect

Clutch in doesn't change the noise but loading up the engine against the handbrake makes the noise dissipate

Flywheel looks ok

Fuel Damper changed

 

 

Timing chain tensioner is going to be checked next.

Edited October 17, 2016 by SeeNoWeevil

[Aashenfox]

I was going to say TCT. Reminds me of the classic S2000 tensioner sound albeit a little deeper.

[SeeNoWeevil]

Timing chain tensioner looks fine. Running out of ideas.

[Olly350z]

Following. Mine sounds like this after a real good run. Tuning shop recently hqd it was fine as they are noisy engines, but they did suggest injector tick

[SeeNoWeevil]

Following. Mine sounds like this after a real good run. Tuning shop recently hqd it was fine as they are noisy engines, but they did suggest injector tick

I'm getting absolutely nowhere with it and almost everything has been examined. I'm told the engine is in excellent condition and the symptoms/inspections don't point to any major internal damage, but we can't find the source of the noise. The only remaining things to check are the VVT solenoids.

 

I'm not sure I can tolerate the uncertainty over the condition of the engine/car personally.