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Old 07-08-2012, 07:27 AM   #1
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knocking from engine boxster s

hi all, i have a boxster s 3.2 2001, i have a knocking from the engine only when the temp is up, i think its the oil once it gets up to temp it thins out and then the knocking starts, im using 5w40 mobil 1, any ideas before i change to 10w40 oil? cheers

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Old 07-08-2012, 09:28 AM   #2
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Once the engine (and oil) is warm, a 5w40 oil should have more than enough viscosity to protect the engine (its not likely "thinning out" unless your engine temp is over 250). Changing to a 10w40 will not likely improve the viscosity (its 40 in both oils when warm).

The first thing that I would do is to have your front engine mount inspected, its probably worn out and making a knocking noise.
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Old 07-08-2012, 10:07 AM   #3
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Detonation or ticking/valve train noise?
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Old 07-08-2012, 10:47 AM   #4
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it only knocks when its up to temp and idleling, as soon as i put my foot down a bit it stops (when in motion there is no knocking)
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Old 07-08-2012, 11:30 AM   #5
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Are you using at least 93 octane fuel. I once put in 91 octane in my Boxster by accident and I notice knocking at idle speed.
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Old 07-08-2012, 11:49 AM   #6
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Is the knock most notable @2,700 RPM?
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Old 07-08-2012, 11:56 PM   #7
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no the knocking only sounds when its up to temp and idleling/tick-over, when i put my foot on the acc it stops, my thoughts are that the oil is thining out when temp is up and when i put my foot down more oil go in and stops the knocking,,
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Old 07-09-2012, 12:51 AM   #8
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Detonation, valve, or crank? Should be able to tell from the sound and where its coming from. A "tick" is probably valve related, but hard to say. You should post some audio/video.

I seriously doubt that its the oil viscosity.
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Old 07-09-2012, 10:24 AM   #9
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Does the knocking change if you press in the clutch?
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Old 07-09-2012, 12:10 PM   #10
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My engine knock turned out to be the water pump getting wobbly.
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Old 07-09-2012, 01:25 PM   #11
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A light tick at idle may be injector noise
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Old 07-09-2012, 01:48 PM   #12
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Quote:
Originally Posted by RICHARD X View Post
hi all, i have a boxster s 3.2 2001, i have a knocking from the engine only when the temp is up, i think its the oil once it gets up to temp it thins out and then the knocking starts, im using 5w40 mobil 1, any ideas before i change to 10w40 oil? cheers
Does it sound anything like this: Clicking sound from engine bay - 2006 Cayman S - YouTube
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Old 07-13-2012, 06:28 AM   #13
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it does not sound like a light injector tick, more of a knock, only happens when on tick-over around 800rpm and when car is up to temp, when 1st start and cold it purrrrs like a cat!!, the car is an auto-tiptronic, if its a mechanical problem sureley it would happen when i 1st start the car and happen all the time,, im gonna change the oil to a higher viscosity to see what happens!!
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Old 07-26-2012, 09:39 AM   #14
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knocking on the wall?

Is that sort of knocking on the wall behind seats? It's heard after 10 or 15 minutes of warming up, specially while going on non-so-flat roads, more intense when stepping up accel. pedal, so to say...

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