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Squealing noise and low idle speed on cold start


 
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AWG81



Joined: 26 Jul 2017
Posts: 115
Location: Seascale

PostPosted: Thu Jul 15, 2021 8:02    Post subject: Squealing noise and low idle speed on cold start Reply with quote

Hi all,

I'm having continued trouble with my recently purchased L300 - Latest issue is a squeal when starting up from cold and a low idle speed (around 500rpm) until the engine warms up a bit. The two seem to be connected as the squeal goes away when the revs pick up to normal (750rpm). This is a different squeal to the alternator belts as I replaced those recently to fix that very issue!

My battery charge seems a little low so I'm wondering that could be the cause? It's showing 12.3v.

The van has had a timing belt change and new water pump last year.

Any wisdom gratefully received!
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PostPosted: Thu Jul 15, 2021 8:02    Post subject: Google Ads keep this community free to join!


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andyman



Joined: 08 Dec 2012
Posts: 5601
Location: Penrith

PostPosted: Thu Jul 15, 2021 8:40    Post subject: Reply with quote

If it's any comfort, mine has been like that for the last 11 years.

If battery level is low, short of overtightening the belts, you'll get a bit of squeal straight after start-up until the glow-plugs go to half-power or shut off.

To overcome the slow idle, which isn't helped by the alternator's increased drag from giving power to the starter motor and plugs, I just set the hand throttle (choke knob) to give around 750rpm until either the plugs go off, or I start driving.

Don't forget to release it, or you'll have difficulty stopping!

Check you alternator belts for tightness, they may have slackened off a little as they bedded in, too much squealing, and they will get burnished shiny by friction and lose their grip.
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Andy C L300 Super Exceed - over 100 smiles per gallon!
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AWG81



Joined: 26 Jul 2017
Posts: 115
Location: Seascale

PostPosted: Thu Jul 15, 2021 9:01    Post subject: Reply with quote

Ha, thanks Andy - that is of some comfort!

I don't think mine has a hand throttle / choke. Where should I be looking? It's a 1995 2.5 TD

I'm driving up to Scotland in a couple of weeks from the south coast so I might put a new battery in anyway to be on the safe side. Whilst I'm here - what is the standard battery for the L300? The one that keeps popping up in my searches is the 335 but that looks bigger than the one I have fitted currently.

Thanks very much for your help.
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