Engine tick noise and turbo lag

[Mountainman]

Hello, seeking advice from all you knowledgeable people

I brought my M100 a few weeks ago from a garage which had received a service.

The car has 82000 miles and since I have owned it have done 140 miles, mostly driving back from garage.

The engine sounded perfect although I’m no expert by any means.

However after I had taken the car out for a bit of a run after a couple of weeks on the drive, I noticed a ticking noise coming from the engine it was audible enough to get my attention as it was not there before. Any ideas please?

Also is it normal for the turbo to kick when delivering some power?

I get a feeling it’s a trip back to where the car was brought.

Thanks for any advice

[John_W]

I bet most replies go for a sticky hydraulic tappet.

Maybe you could give an idea of where on the engine the noise is coming from. Just open the bonnet and if you don’t have a stethoscope, use a solid bar or big screwdriver to put against various bits (carefully, obviously as you’ll want to avoid getting it or you or your clothing anywhere near the moving bits) and the other end to your ear.

Be aware that the CAS (the round black thing on the right as you look at it) acts as a sound chamber, magnifying sounds from other parts of the engine, but it is possible that a misaligned Hall sensor inside it might cause a ticking noise. Just to rule out 5th gear problems, get behind the front left wheel (you should be able to do it without removing the wheel) and put your stethoscope/bar against the alloy casting on the end of the gearbox; although any 5th gear problems would produce more of a “whirring” than “ticking” noise.

I doubt it’s anything serious.

Good luck.

John

John

[Rambo]

Re your lack of turbo performance I suspect a sticky wastegate.

Do you get a fluttery sound on full boost ? And what does it say on the boost gauge when you are booting it ? Should be about 0.65 Bar, or more if it has an Everest or Kilimanjaro ESM chip

Have a look here for an easy cheap fix for that . Worth doing anyway to check it is freely moving

http://wikilec.com/view/Wastegate

http://wikilec.com/view/Wastegate:_Releasing

Some people use mole grips to simply free the shaft. Others use a bicycle pump to check the wastegate actuator module is all working hunky dory.

[Simon_P]

could the kick be a missfire?

[John_W]

I think we need a bit more of a description of the “kick”, but no, it shouldn’t.

[Rambo]

I think we need a bit more of a description of the “kick”, but no, it shouldn’t.

Yes, you're right John. I read the initial post and assumed sticky wastegate but "kick" sounds more like overboost ???

Maybe there is a big exhaust on the car and the wastegate isn't ported ??

We definitely need more info

[Mountainman]

Obviously hard for me to try and explain in words, and I I cannot thank you enough for your
Thoughts and input I’m sure you know a lot more about this than me, as I’m just starting out.

The ride is smooth though the gears when gentle but when you get that urge to basically for the better
Of the expression put the foot to the floor! It takes a second maybe less for the power to kick in
A small jolt and the power is there.

Maybe I’m over thinking this one, i just would like the reassurance everything is as it should be
before the warranty runs out, if there are any gremlins with the car I have 6 months to sort if the warranty
covers.

Thanks again

[dapinky]

Mountainman,

What you describe sounds a bit like 'turbo lag' - basically, when you open the throttle fully, a number of things happen - all of them are dependent on the throttle opening and the revs at the time....

The Throttle possition sensor (TPS) tells the ECU that 'more' is required from the engine, so the ECU will add fuel at the injectors (fairly instantanious) and accelleratrion ensues.

The turbo should only start to add boost once the engine is over 3000 rpm, and is a gradual application of extra 'oomph' up until the red line (or gear change).

Also, there are a set of secondary throttle flaps which open at full throttle (at something like 5500 rpm, but I cant remember the exact number) to allow extra air intot he system along with the extra fuel.

As all of these things occur at different times, and it takes a few fractions of a second for them all to catch up and allow smooth performance, there is often a bit of a 'dead' feeling when you first boot it, especially you are under 3000 rpm at the time (more noticable on a gear change than a steady run). until the boost request from the turbo catches up.

This can be minimalised with a dump valve, but can't be eliminated completely, as the turbo is a mechanical boost 'additive' and there are fluid dynamic considerations which can't be overcome.

[Simon_P]

(at something like 5500 rpm, but I cant remember the exact number)

4700 rpm

[theelanman]

i just would like the reassurance everything is as it should be
before the warranty runs out, if there are any gremlins with the car I have 6 months to sort if the warranty
covers.

if you happen to be passing Buxton I'll be happy to cast an eye over it.......... .......

[Mountainman]

Thanks again for your responses, certainly helps.

I may have to take you up on that offer theelanman, very kind indeed
Would be nice to get to meet some fellow passionate owners.
Many moons ago I was at college at Harper hill so I know the Buxton area really well.

Would be a great drive out in the Derbyshire countryside.

[theelanman]

if you like that one......I do one for LDC which starts in Buxton and you drive the Peak District for about 100 miles........
thats on the 30th June....I have more info if youre interested.......

[Mountainman]

Would love more info please I’m actually free on that Sunday thanks

[LRS7]

That reminds me.... sent my application form off for the Serpentine Run and Cheque a while a go and heard nothing mate ? Just checked my bank and it hasn’t been cashed any thoughts

[simonbuk]

Interested to know if there was any outcome to this ? Even if it was just a drive out somewhere !!