Pinking on a low mileage, standard TT

Mods please move if not technical enough...

'98 TT VVTi, on 33,000 miles. Stock except for Nur Spec cat-back. Shell high-end fuel for last two years. No gauges, so I cant tell you afr's etc.

I've had slight pinking on an off for a year or so, not often, always at low speeds / revs, mainly on inclines.

I thought it had gone away, but still there every now and again.

I'm coming up for a service, and I have funds to replace whatever is needed.....advice please ?

I've a new O2 sensor.

Air-filter is stock, and will be replaced.

Fuel filter will be replaced.

I hope I'm not totally coked up.

Plugs...I've read they can be linked to pinking / det. I want to make sure the plugs are correct when changed, so what are the ideal plugs for me ?

Coil-packs...likely cause of det ? Is it sensible to replace at this age and mileage ?

Fuel pump...same again, good idea to replace / up grade at this mileage ?

Any other replaceable item that could cause det ?

As ever, advice is really appreciated.

Fuel Filter pump. to start with for defo. Then injector clean.

For plugs see here

Det is usually caused by Too much Heat and or pre ignition- Period. The cause of too much heat is what you usually need to address on a Di engine.

Det is usually caused by Too much Heat and or pre ignition- Period. The cause of too much heat is what you usually need to address on a Di engine.

So, I also double-check the smic.

Carbon build-up can cause pre-ignition I've read:(

Never seen that in a 2JZ, but anythign is possible.

Does it pink when cold? If so then its usually lack of fueling.

Does it pink when cold? If so then its usually lack of fueling.

No, only when fully warmed up. Its not all the time, just now and again and definately more often in hotter weather.

IN that case yes check the intercooler too. Sounds likley if it when it gets hot.

For plugs see here

I've read that, didnt see anything about VVTi TTs...then realised like an idiot that Alex was running a VVti. Ok, I'm happy with plugs now:)

How old are the plugs Ewen? Might be worth removing them and checking them

How old are the plugs Ewen? Might be worth removing them and checking them

Always woth doing that on a service

Mods please move if not technical enough...

 

'98 TT VVTi, on 33,000 miles. Stock except for Nur Spec cat-back. Shell high-end fuel for last two years. No gauges, so I cant tell you afr's etc.

 

I've had slight pinking on an off for a year or so, not often, always at low speeds / revs, mainly on inclines.

I thought it had gone away, but still there every now and again.

I'm coming up for a service, and I have funds to replace whatever is needed.....advice please ?

 

I've a new O2 sensor.

Air-filter is stock, and will be replaced.

Fuel filter will be replaced.

I hope I'm not totally coked up.

Plugs...I've read they can be linked to pinking / det. I want to make sure the plugs are correct when changed, so what are the ideal plugs for me ?

Coil-packs...likely cause of det ? Is it sensible to replace at this age and mileage ?

Fuel pump...same again, good idea to replace / up grade at this mileage ?

Any other replaceable item that could cause det ?

 

As ever, advice is really appreciated.

Det/knock is quite common on EFI engines, at low RPM high load ie hills etc, especially in hot weather, i have had a few that did it with no ill effects, its just the mapping, you only really want to start worrying if it occurs at high RPM/boost areas.

Ewen, I'd say "get it over to Stuart at Toyoda Tech", but then I always say that when things go wrong!

33k miles on virtually stock boost shouldn't have done for your plugs yet - they should be good for ~60k, and your intercooler can't possibly be shot yet - mine's got no fins left, and is full of leaves and ciggy butts, but my charge temp is sort of OK...

Put a boost gauge on it and check the boost is correct. Let us know what readings you see at various RPM's.

Thanks guys.

Chris, what are you thinking re boost ?

I have a customer with a probelem that sounds identical. His first turbo has a damaged compressor wheel. It makes low boost and pinks at cruise.