knocking from engine boxster s

[RICHARD X]

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

[thstone]

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.

[jaykay]

Detonation or ticking/valve train noise?

[RICHARD X]

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)

[redeye280z]

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.

[Jake Raby]

Is the knock most notable @2,700 RPM?

[RICHARD X]

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,,

[particlewave]

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.

[thstone]

Does the knocking change if you press in the clutch?

[Wret]

My engine knock turned out to be the water pump getting wobbly.

[jaykay]

A light tick at idle may be injector noise

[ChimpanZed]

Originally Posted by RICHARD X

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

[RICHARD X]

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!!

[josefer]

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...