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08-04-2012, 07:04 PM | #1 | ||
Regular Member
Join Date: Oct 2011
Posts: 139
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Hi all,
Our Ford AU has a very strange "popping" sound when idle, it's NOT in time with the engine - it seems totally random, kind of like water dripping onto a metal surface. It sounds stronger from the driver's side of the engine, and you can hear it louder sticking your head under the car. I suspected an exhaust manifold leak as I knew the muffler had a few holes and the mechanic thought there was a hole in the engine pipe as well (between cat and manifold). Here was the original video: http://youtu.be/thrqtC3I5wY You can hear it loudest when I walk in front of the car and lean on it a bit, right before I start revving the engine - you can't hear the sound anymore of the sound of it revving, only when it's idling. Oh and I realise how bad it sounds when it's revving... it's an old engine, I just want it to last as long as possible then we'll put in a newer engine. So all the repairs we're doing to the car is everything apart from the engine We've now had pacemakers, new metal cat and a redback 2.5" catback exhaust fitted. The damn sound is still there! http://youtu.be/9742LdDf7v0 (totally out of focus, but that's with the new exhaust system fitted). Does anyone know what the hell this sound is? Last edited by webbiegareth; 08-04-2012 at 07:15 PM. |
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08-04-2012, 09:07 PM | #2 | ||
FF.Com.Au Hardcore
Join Date: Jan 2012
Location: outback S.A...hiding in a workshop
Posts: 3,513
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may be miles off here but I get a similar sound from my belt,.....doesn't always do it but it sounds similar
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--------------------------------------------------------------- G'day....I'm Dave, ...everyone calls me Poppa,..05.. B.A. Fairmont mark II... may your day's be filled with smiles, your life be filled with love, may your children know nothing but happiness and joy, cherish the memory of those who strove before us for they cleared the way, spare a thought for those who serve we owe so much to so many, life and the freedom to enjoy it is a special gift that can be taken away far too soon! |
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08-04-2012, 09:57 PM | #3 | ||
Bugger!
Join Date: Jul 2011
Location: Albany, WA
Posts: 3,307
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These videos are always difficult...
Suggest crank end float? Try running without the belt and check play on the tensioner pulleys, water pump, and aircon compressor?
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Whoops, there goes another factory setup! Chop and change - butchering cars since 1990 |
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08-04-2012, 10:55 PM | #4 | ||
Auto Nerd
Join Date: Feb 2012
Location: Sydney
Posts: 808
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I have the same sound. I thought it was a bearing or end float, but it disappears once the engine revs. I had the sump off recently everything looked ok.
I'll try running without the belt - but so far, complete mystery as to what it is. |
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09-04-2012, 08:13 AM | #5 | ||
Regular Member
Join Date: Oct 2011
Posts: 139
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Thanks guys... have you had it for a while? It's not going to kill the engine quickly if it's crank end float is it? I figured it wasn't a real problem with the main components of the engine though as like Evgeni said, it disappears once the engine revs.
I figured it was an exhaust manifold leak as it sort of sounded a little bit like one I found on youtube, however after replacing the entire exhaust system is mustn't be that (else I have extremely bad luck and the new system wasn't installed correctly - I doubt that though!). I'll swing by the mechanics on the way to work this morning and give him a listen. |
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09-04-2012, 08:36 AM | #6 | |||
Auto Nerd
Join Date: Feb 2012
Location: Sydney
Posts: 808
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Quote:
It doesn't seem to affect performance. I'm getting around 16l/100kms on lpg. City driving with the air con on. Figures get better in winter with the air con off. |
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09-04-2012, 09:56 PM | #7 | ||
Bugger!
Join Date: Jul 2011
Location: Albany, WA
Posts: 3,307
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End float won't kill it too quickly. I've seen a few engines with 3-5mm end float that still ran like kittens. The best one was a 3.9 Falcon engine with 7mm! But you wouldn't have known - we only rebuilt it because it was smoky
Basically - it's a Falcon, thrash it into the ground and then replace the engine, just like everyone else haha
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Whoops, there goes another factory setup! Chop and change - butchering cars since 1990 |
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09-04-2012, 10:17 PM | #8 | ||
Regular Member
Join Date: Oct 2011
Posts: 139
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Is that what it is though? The engine is very smooth.... idles smoothly, accelerates smoothly, cruises smoothly etc etc... doesn't use any oil between services...
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09-04-2012, 10:25 PM | #9 | ||
Bugger!
Join Date: Jul 2011
Location: Albany, WA
Posts: 3,307
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Without seeing it.... couldn't tell you, sorry. You can check things out; remove the bellhousing dust cover and starter to look for damage, drop the belt and check your ancilliaries/check end float (very roughly), drop the exhaust and shake it out, and check the chain over. After all that, is the engine really worth any further digging if you're waiting for it to die anyway? Sometimes it's best not to look too hard; it can get expensive fast!
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Whoops, there goes another factory setup! Chop and change - butchering cars since 1990 |
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10-04-2012, 09:27 AM | #10 | ||
Regular Member
Join Date: Oct 2011
Posts: 139
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I swung it by the mechanic this morning but it was a waste of time - it was raining heavily, and they have a metal roof so we couldn't hear the noise, and couldn't hear it outside in the rain too. Naturally once I got to work and parked it, it had stopped raining and I could hear it. Aaaargh! I'll try again when it's not raining.
The exhaust is all new, unless they've got a leak in it. You're right, I don't want to spend much working it out as I can get a lower km's engine fitted for $850. The car itself was my girlfriend's mum's car with 250,000km's on it - most of them country k's (they live out in a little country town out in whoop-whoop), and she drives like a grandma so it's never been thrashed. |
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08-11-2012, 10:50 PM | #11 | ||
Regular Member
Join Date: Jul 2012
Posts: 108
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I know this thread is a few months old but I'm bumping it cause mine has the same sound! I figured it might just be oil dripping back into the sump from the head, or transmission oil splashing back into the transmission sump from the cooler return line. Hopefully.
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08-11-2012, 11:58 PM | #12 | |||
Auto Nerd
Join Date: Feb 2012
Location: Sydney
Posts: 808
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Quote:
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09-11-2012, 08:13 PM | #13 | ||
Regular Member
Join Date: Mar 2012
Location: Australia
Posts: 332
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Very interesting read!!
Our AU1 has the same noise too. I started a thread re bottom end noise and quite a few helpful AFF members put my mind at ease. I did all the usual checks with belts, pulleys etc etc. One thing I did find is that the guts of my cat converter is loose, however there is still some noise from the engine. Thicker oil helped to quieten it a lot. It's still there but doesn't really bother me now ( especially now I know so many others have the same thing) it only happens around 1200-1500rpm with no load and it's not very often the engine operates like that anyway. Cheers |
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12-11-2012, 08:33 PM | #14 | |||
FF.Com.Au Hardcore
Join Date: Feb 2010
Location: Sun City, North Australis
Posts: 4,274
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Quote:
My previous EL also had the same noise. Comes and goes.
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You've seen it, you've heard it and your still asking questions?? Don't write off the Goose until you see the box going into the hole.... |
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10-11-2012, 11:57 AM | #15 | ||
Regular Member
Join Date: Jul 2012
Posts: 108
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Stuck my head under the car again this morning and had a listen. To me it doesn't sound like metal on metal, more like a splash/drip sound. I think the big oil drain passages are in the back of the head so it might just be oil sloshing down there into the sump, maybe the crank hitting some oil on the way down.
Makes sense that thicker oil would reduce the splashing. But I think I'll stick with my favourite Mobil semi-synth 5w-30, it doesn't burn/use any and I get low 7 litres/100km on the highway |
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12-11-2012, 08:28 PM | #16 | ||
FF.Com.Au Hardcore
Join Date: Mar 2005
Posts: 1,229
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My AU2 XR6 ute does it as well.
I have had the ute since new from Dec. 2001 It has made that noise for as long as I can remember. I can recall discussion on this forum relating this noise to the charcoal canister solenoid. Bill.
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AUII XR6 VCT ute 20 years and still going strong! |
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