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Horrible Hot Starts

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Old Mar 21st, 2018, 23:13   #1
stiggles
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Default Horrible Hot Starts

Hi Folks

I've returned to X40 ownership after 2 years and I'm now running a 52 plate v40 1.8 (Volvo engine). The vehicle has done just over 104,000 miles.

All is well apart from hot starts which are a mixture of baffling and terrifying. It catches quickly but there is an almighty clatter that shudders the whole car for a fraction of a second before it settles down into a quiet & stable idle. The noise is almost metallic. It's quite embarrassing. Yesterday I turned a few heads on the petrol station forecourt

I'm no stranger to these engines (having had both a v40 and s40 before this one), but I've never experienced anything like this before.

I've just done a full service (air-filter, genuine oil filter, genuine Volvo plugs) and it runs beautifully apart from the aforementioned hot starts.

VVT is quiet, and it pulls and runs great otherwise.

Any suggestions? Time permitting I'm going to see if I can record what it's doing over the weekend.

Thanks

David
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Old Mar 22nd, 2018, 18:32   #2
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That makes me think of engine mounts.
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Old Mar 22nd, 2018, 21:14   #3
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Here's an example

Typically when I decided to film it wasn't as loud as I've heard previously it but should give you some idea

+ YouTube Video
ERROR: If you can see this, then YouTube is down or you don't have Flash installed.
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Old Mar 22nd, 2018, 22:57   #4
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And it only happens when it's hot? Cold start is normal?

Starter motor sounds a little odd...I wonder is the correct one fitted?
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Old Mar 23rd, 2018, 12:41   #5
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do you have a rail fuel pressure regulator on that puppy? That is one strange sound. It may be worthwhile to get a fuel pressure tester hooked up to see how the pressure looks at start-up. Maybe try also cleaning the throttle body...
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Old Mar 30th, 2018, 20:05   #6
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Hi Folks

I think after some further investigation I think I've got 2 issues. The hot-starts are smoother since the swapping out of the plugs but I'm still getting some odd noise and clattering on start-up. I also noticed a similar noise can occur momentarily on blipping the throttle.

I grabbed a camera and filmed the aux belt area with the engine running (look further on for slow-motion footage)

+ YouTube Video
ERROR: If you can see this, then YouTube is down or you don't have Flash installed.


As you can see for a fraction of a second there's allot of belt chatter. Given the hot-starts can be irregular as well I think that's causing extra noise from the belt area. It's generally quiet at idle so I'm assuming it's either the tensioner or possible a very early sign of the alternator clutch pulley as I understand that is designed to smooth out/deal with engine vibrations.

Depending on how long I keep the car (I'm currently running it as a stop-gap) I may swap both the pulley & tensioner.

Will keep everyone updated.

Thanks
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Old Oct 10th, 2018, 00:54   #7
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Hi All

Sorry for resurrecting this thread after so long but I wanted to provide an update with a notable (worrying) development that happened on last week.

Since my last posts I traced some noise back to a seized free wheeling alternator pulley. After some fun & faff getting the right pulley (it turns out my car seems to have a 2.0T alternator?) it eliminated quite a bit of the belt movement and seemed initially to quieten down the startups also.

Then last week - this happened whilst on holiday
+ YouTube Video
ERROR: If you can see this, then YouTube is down or you don't have Flash installed.


The initial turn-over sounded pretty terminal and I assumed it was Valves contacting pistons. The next turn-over it ran as normal. It's continued to do this if restarted when hot (albeit not quite as violent) over the last week. If left to cool it starts ok. I'm completely baffled as to the cause now, it almost sounds like it's predetonating perhaps and firing out of sequence the first time which obviously isnt good for the engine's longevity.

So at the moment I'm unsure what the solution will be. It successfully clocked up a further 1200 miles after this 'incident' so I can't believe it's a timing belt issue. I'm considering throwing some 98Ron or higher fuel in it next to see if that aids with the hot starting or perhaps even trying a carbon clean incase it's a carbon build up causing the strangeness.

As before I'll keep you posted if I ever suss the problem!
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Old Oct 11th, 2018, 18:54   #8
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It sort of sounds like over advanced ignition timing that i have had in old cars from years ago that didn't have electronic ignition systems & the distributor had moved. That problem can cause pre ignition & try to force the piston back down the cylinder before it reaches the top, causing sluggish starter motor turn over & a knock similar to diesel knock.
But as your car doesn't have a distributor, & is all elecronically controlled, i don't know if the timing could possibly be out or not ?
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Old Oct 12th, 2018, 14:13   #9
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Ahhhhhh, yes. So maybe a camshaft/crankshaft position sensor - it's tiny internal coil going open circuit when hot, maybe, and the engine management failing to predict the exact moment.

Just a thought.
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