High Knock After Service

[TiTAN]

I know it might be what trent said with the cas but has anyone thought about the mechanic taking the car for a testdrive; thrashing it for an hour n filling the tank back up with regular 91 octane fuel? thats why its knocking so bad.

plausible as if u only had quarter tank n he used most of it, refilled with 91octane and cos ur car is tuned for 98, its knocking.

jst a thought!

if you fill the tank with 91 driving like miss daisy with a tune for 98 will still cause ~100 knock or more the moment you go near a slight incline.

[Get EPIC]

I know it might be what trent said with the cas but has anyone thought about the mechanic taking the car for a testdrive; thrashing it for an hour n filling the tank back up with regular 91 octane fuel? thats why its knocking so bad.

plausible as if u only had quarter tank n he used most of it, refilled with 91octane and cos ur car is tuned for 98, its knocking.

jst a thought!

Na mate,i was there most of the time and he's not as dumb as that.Filled up since then too

[Get EPIC]

If the person changing your cam belt marked the cas and put it back in exactly the same position your timing will still be out bacasue of the new belt. 'Tell your tuner that your cambelt has been changed and you probably just need 5min of his time to check the base timing - not a 2 hour tune, and he should be able to fit you in (if not get another tuner).

yeh my tuner said the same thing.I'm taking the car down there tomorrow.Cheers

[Get EPIC]

Just got back from seeing Matthew Spry.He got the timing light out out and adjusted my CAS.He said it was out bugger all but all is fixed now.A Big thanks to Matthew and thank you to everyone who replied on this topic!

[Get EPIC]

Unbelievable! Went for a drive this morning and got knock readings of 75 and 121 while giving it a squirt in 1st and 2nd!!! Just driving normal im getting readings up to 30.So after matthew Spry adjusted the base timing it was good for a couple of weeks and gradually got worse.Really getting frustrated.

[paulr33]

so has it always been like this or just started since the service

if always

then how was it tuned, if its just tuned on the dyno

then its likely to knock on the street, most cars knock differently on the street vs dyno

typically the owner abuses it thru the gears which is different to load simulation on the dyno

the end result is you touch a few cells tht might have too much tming, so these needs to be fixed

if only just started

then check what was changed and adjusted at the service

[Get EPIC]

yeh. only been like this since the service.

[Guilt-Toy]

You need to take your car to a good tuner and get him to check your cam belt timing. If your cam belt timing is out then it will cause knock as well. once the cam belt timing is checked then check the ignition timing. if the ignition timing is okay then its possible the cam belt or ignition timing was out when it was tuned so now that everything is set correctly there are problems.

Stop flogging the car you could damage the car.

Get everything checked including the cam belt timing and then ignition timing and then get the car completly re-tuned.

[bradsm87]

Either they 'corrected' the timing which they shouldn't have or they put regular unleaded in it.

[Get EPIC]

Either they 'corrected' the timing which they shouldn't have or they put regular unleaded in it.

i've been through about 8 tanks of bp ultimate since