pinking problem

[Skin]

My corolla, an ae102, has been pinking lately. Running 95/98 octane fuel seems to help a bit, but being a 7afe it shouldnt need that sort of fuel to function. Gassed up with 91 yesterday, and its pinking its nuts off.

Recently replaced thermostat and spark plugs, so they arent the problem, and the vehicle definitely isnt overheating. havent checked the timing yet, but the car seems to run fine, and feels about as fast as one of them should be.

Any suggestions?

[strx7]

does it have a knock sensor just under the number 3 inlet runner?
is it bringing up a check engine light at all?

[Skin]

nah no check engine light, though i might run a check over the weekend.

I read somewhere that the EGR system might be contributing, though im not sure how

[sergei]

Normally Japanese domestic vehicles do not have EGR (unless diesels).
Check timing. Excessive carbon could also cause this symptom.

[Skin]

Its an australian market vehicle, if that makes a difference. So just like NZ market im guessing? might get the guys in the workshop to check timing for me today

[MAGN1T]

Just pull it back a couple of derees after marking it. That way you can put it back the way it was if it doesn't work.

Steve

[tsoob]

what fuel does it recomend inside the fuel flap?

[sergei]

Its an australian market vehicle, if that makes a difference. So just like NZ market im guessing? might get the guys in the workshop to check timing for me today

It might have EGR.
You can disable it by by either removing whole system and blanking it with flanges or disconnecting and plugging in the vacuum tube that activates it.

You will see a pipe (~20mm dia) going from exhaust manifold into intake manifold via diaphragm type valve.

[Flannelman]

Said you changed the plugs, sure they are of the correct heat range? If there in the wrong heat range (too cold) then they will be acting like glowplugs instead of sparkplugs.

[Skin]

Yep definitly right, being an ex toyota parts person i only ever use genuine stuff, so they are right out of the catalogue.

Tweaked the timing last week, wasnt really out much. Interestingly, after going through a tank of 91 this past week, i only got 450km to the tank, where as before, with a tank of 95, it would go well past 500km...

still yet to check egr, if applicable

[MAGN1T]

Tweaked the timing last week, wasnt really out much. Interestingly, after going through a tank of 91 this past week, i only got 450km to the tank, where as before, with a tank of 95, it would go well past 500km...

That's pretty much normal for any car that runs on low octane and less timing.
That's why you're supposed to run it on higher octane if it's designed for it.

Steve

[tsoob]

id say run it on 98 and ull be fine

[Skin]

oh im sure it will be fine on 98, though i can still just hear it even now. the main problem with that is its supposed to be an economical daily, built to run on 91 octane, and while im still not paying the sort of money for 98 octane fuel that you guys are (its about $1.26 at the moment), its the warwick of the matter that gets my goat

[Mr Revhead]

It is meant to run on 91 so running it on 98 to fix the issue is not solving the issue.

Have you checked the 02 sensor is working correctly?
You could take it to a decent tech rather than those jumped up VW techs
Plug it into a scan tool andd see whats it's doing

[Skin]

You could take it to a decent tech rather than those jumped up VW techs

come come now warwick, greens not a good colour for you

[Mr Revhead]

I look frickin awesome in a green mankini

[QikStarlie]

maybe carbon'd up hard. old school v8 guys used to pour water down the carb at 3000rpm,lots too. to pretty much steam clean the engine. much like water injection does over time, but more brutal

[sergei]

maybe carbon'd up hard. old school v8 guys used to pour water down the carb at 3000rpm,lots too. to pretty much steam clean the engine. much like water injection does over time, but more brutal

They could afford to poor lots of water with their low compression engines and huge displacement.

[rollaholic]

do the water thing and film it in case of lols for later

[MAGN1T]

Motors don't "carbon up", never have done.

Oldschool V8 guys used to run leaded fuel, as everything did. The "carbon" is actully lead, It doesn't happen any more or if it does, it's because it's been burning lots of oil & needs a rebuild.

Steve