Piranha Posted March 3, 2015 Share Posted March 3, 2015 This only happens when the car has sat for a day and started cold, an initial thump comes from around drivers foot well area, there is also an initial grinding / rattle / rasp sound that lasts for about a second, then back to a quiet engine. 2003 engine on 40k last oil change July 14, not burning oil, nice and smooth running. The thump & rattle can occur together but often its one or the other. I have read on some forums that it could be to do with a return valve in the air filter, others have said its linked to the timing chain. Some have said dealers state as long as the noise lasts for 1 - 2 seconds its not a problem. Since the weather has started to warm up a bit, i also get a slight wiff of petrol fumes outside the car not sure if this is related or its running rich. Any one had similar problems Thanks Quote Link to comment Share on other sites More sharing options...
glrnet Posted March 3, 2015 Share Posted March 3, 2015 I've not heard this described before It'll be interesting to know what it is. **edit** auto or manual? 1 Quote Link to comment Share on other sites More sharing options...
MCook Posted March 3, 2015 Share Posted March 3, 2015 I have a rattle upon ignition, and when the engine is turned off, sounds like it is coming from the transmission. I don't have any 'thumping' however. 1 Quote Link to comment Share on other sites More sharing options...
Piranha Posted March 3, 2015 Author Share Posted March 3, 2015 (edited) I've not heard this described before It'll be interesting to know what it is. Continuing research at the moment This is the rattle sound I am hearing https://www.youtube....h?v=kWqxyQkPwVg Also read this which does make sense, sound like I have the former and not the latter: If you have a VQDE engine (2003 to 2005) this is not an uncommon problem and there is a TSB from Nissan explaining it. On a cold start one of the intake VTC (valve timing control) sprocket units can make a rattling sound for one second until it re-indexes. My 2004 did this every now and then for the ten years I owned it. I never bothered to replace it, as apparently it causes no long-term harm. I couldn’t find the 350 Z TSB This engine has a timing chain guide that tensioned by oil pressure, but it also incorporates a ratchet mechanism to keep it from losing tension when the engine is turned off. A problem with this unit will cause a more pronounced marble-in-a-can knocking sound that persists for longer than a few seconds at start up Edited March 3, 2015 by Piranha Quote Link to comment Share on other sites More sharing options...
MCook Posted March 3, 2015 Share Posted March 3, 2015 Identical to the sound I get. And as you said only on cold starts, I have had it since I bought the car so I'm not too worried about it. 1 Quote Link to comment Share on other sites More sharing options...
Piranha Posted March 3, 2015 Author Share Posted March 3, 2015 Identical to the sound I get. And as you said only on cold starts, I have had it since I bought the car so I'm not too worried about it. Yeah if I start it again a couple of hours later I don't get the rattle , it starts and purrs like a new engine. Quote Link to comment Share on other sites More sharing options...
glrnet Posted March 3, 2015 Share Posted March 3, 2015 I found this:- 1 Quote Link to comment Share on other sites More sharing options...
Piranha Posted March 3, 2015 Author Share Posted March 3, 2015 I found this:- I've continued searching on both issues and both seem very common with the majority stating they've had it for years and its not a problem. Its most likely my car is developing a few creaks n groans related to age, a bit like me Its going in for rear brakes, drop links and bushes next week, so I will get the oil and filter changed just in case, as some people refer to a dry start up issue linked to oil pump. Quote Link to comment Share on other sites More sharing options...
Piranha Posted March 3, 2015 Author Share Posted March 3, 2015 I've not heard this described before It'll be interesting to know what it is. **edit** auto or manual? Sorry missed this , its an auto box Quote Link to comment Share on other sites More sharing options...
glrnet Posted March 3, 2015 Share Posted March 3, 2015 I just wondered if it's anything to do with that, maybe someone else can through some light on auto boxes? It might be worth PMing Zmanalex. 1 Quote Link to comment Share on other sites More sharing options...
Piranha Posted March 3, 2015 Author Share Posted March 3, 2015 I just wondered if it's anything to do with that, maybe someone else can through some light on auto boxes? It might be worth PMing Zmanalex. It could be linked, i don't have any codes up though and engine runs like a dream, only had car 5 months so experienced more cold starts than hot LOL, I could see this quite easily disappearing during the summer. Cars still under warranty, so will get it checked out next week just in case there is pending mechanical failure. I will leave it with them over night so they can cold start to reproduce Quote Link to comment Share on other sites More sharing options...
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