pesky rattle

[Dean O]

just a quickie

I've got an odd rattle that 1st appeared 3 days ago on the T8. can't hear it while driving but the last 5 times I've pulled onto my drive after a run & sat there for the obligatory 30 seconds waiting to switching off . . . . a nasty 'fan blade catching metal' type sound has been apparent. 4 times now I've flipped the bonnet catch & sprinted out to open it, each time too late cos it stops after around 7 seconds. turbo maybe?

[ejenner]

When turbo's catch they sound like police seriens.

Are you saying it's always specific to the 'arriving at home' situation? or is it any time you idle? Have you tried gently squeezing the accelerator to bring the revs up by about 100rpm? As the car most likely shakes gently at idle (800rpm?) there could be something rattling (two metal parts hitting eachother) - if you raise the engine speed slightly and the noise goes then check around the engine bay for loose brake pipes, clutch feed, loose covers, ect, ect...

[Dean O]

thanks I'll try that

haven't tried anything at all yet - apart from losing the sprint to open the bonnet before it stops. have only heard it when arriving home to date, assumed its turbo cos I live at the top of a hill with a series of nice boosty twisties leading to it so, its not there normally on idle, only after a bit of welly & even then only for a few seconds.

[ejenner]

Originally Posted by Dean O

I live at the top of a hill with a series of nice boosty twisties leading to it

Haha, like this you mean?

[woywitka]

Originally Posted by ejenner

Haha, like this you mean?

please don't post pics of my house. thanks.

[Si]

If the turb's on it's way out it will only be noisy when spooling not at idle, i've had one go and it sounded like a circular saw every time i boosted.

After fitting my last turb i got a similar sound, thougth i'd put a knackered turbo on but it turned out that i had'nt bolted the heat shield back on so every time i rev'd the engine it would vibrate.

I'm going to try and record the sound of my engine at the moment as i've got a leaking exh man and a dodgy clutch release bearing, do the same when the bearing is sorted and again when the manifold is done, hopefully i'll end up with various recording with problems and a final one when(ok if!) the engine is running properly.

[Dean O]

bet I know what your exhaust manifold sounds like
typically, my pesky rattle did not happen today - don't know whether to pleased or disappointed

[Si]

Do you know what the clutch release bearing sounds like when that's going? If your unsure next time it makes the noise put a little bit of pressure on the clutch pedal and see if that stops it.

[Dean O]

got me there, Si I've no idea what the release bearing sounds like, though I do have a badly slipping clutch & a new one to fit shortly

[SteveTheFolkie]

.. hop out of the car with the hood open and engine running (but e-brake set) - pull the coil/distributor wire to kill the engine - you'll be "right there" when the noise happens -

last time I tried to "sprint" out of a car to catch a noise I fell in a puddle - the wife and kids saw the humor in the situation - in retrospect (five years have passed) I'm starting to .... the wife (my first, to date) still brings that up - for some reason when we're talking to "new" people ...

Steve

[jetman]

Oh they like to bring up the embarrassing stuff don't they!

[SteveTheFolkie]

Originally Posted by jetman

Oh they like to bring up the embarrassing stuff don't they!

yeppers - but you'd better have God on your side if you decide to do the same to them!

[jetman]

Originally Posted by SteveTheFolkie

yeppers - but you'd better have God on your side if you decide to do the same to them!

Apparently everything I do is something of an embarrassment and their is no God! Actually I feel sorry for her. I'm pretty dramatic and loud and like to keep myself amused by doing obnoxious and off color things. No wonder it took about 10 first dates over 2 years before I wore her down.

[SteveTheFolkie]

I mis-behaved from day 1 - it's been almost 21 years of marriage - apparently though what used to be cute no longer qualifies.
There was a warning, however, when she first moved in with me and made me take the Triumph 500 engine that I was rebuilding off the kitchen table AND decided that the 'fridge I had (it held a 1/2 keg of beer and had a tap in the door) wasn't appropriate either -
But the puddle tumble and the "watch this" motorcycle incident seem to be the most popular to recall ...

Better cut this thread 'fore I get spanked for going off topic!

Steve

[jetman]

I have been explicitly banned from bike and car parts in the kitchen. Over and over again.

[Dean O]

kitchen tables were made for the old 4 strokes - had most of my Royal Enfield 700 Constellation on mine for months
then I bought only Hondas after that one & they NEVER needed stripping

[jetman]

I don't know about that. I had a few old CB/CL450's. Torquey fast old bikes they were, but had some issues with the timing chain tensioners and that 10 mile long timing chain! Loved the torsion bars instead of valve springs though. Bullet proof top end and wonderful knashing sound at 7000 RPM.

[Dean O]

ok just changed the plugs - that was fun cos my plug spanner was too long to fit on no.2 plug - had to take a junior hacksaw to it & blasted it down the road. pull onto driveway, let it idle & the rattle starts after a couple of seconds - actually 'chatter' or 'clacking' would be a more accurate description.
touch the throttle, chatter stays, touch the brake & it disappears only to reappear when I take my foot off. repeat, same result. then per usual, the chatter goes of its own accord after maybe 10 seconds max.
I now assume its the APC solonoid from what I've read on here, but as I've never heard this noise previously, I'm not sure. if it is the solonoid, what is wrong with it & what other running/turbo symptoms should I get.
I have noticed that the boost gauge never gets higher than mid yellow whereas my 16v goes to the red border - tho strangely, the 8v 'feels' quicker

[Dean O]

Originally Posted by jetman

I don't know about that. I had a few old CB/CL450's. Torquey fast old bikes they were, but had some issues with the timing chain tensioners and that 10 mile long timing chain! Loved the torsion bars instead of valve springs though. Bullet proof top end and wonderful knashing sound at 7000 RPM.

all mine were the inline 4 750's - mechanically indestructable, but the wallowy suspension could throw you off then again probably not a fair comparison against older Brit bikes as the Hondas were bought new & replaced at regular intervals.

[Si]

Deano, read ubermitch's saga's on trying to sort out the APC, if you can figure it out from that, i dunno what will!

Definitely your Solenoid Control Valve telling you the APC is'nt playing ball.

Do the usual vac hose checks then move onto testing the APC stuff.