The fuel injector clean that you can opt to do with your service for about $99. Is it the same as filling up your tank with premium petrol?

For Caltex petrol, would standard premium unlead (Vortex) be enough to do a fuel injector clean job or is ultra pemium unlead (Vortex 98) needed to do a better fuel injector clean job? How often do you need to do it to maintain good fuel efficiency?

Thanks
P.S. I am asking for Caltex coz I got the 4c off coupon.

u want them cleaned take them off and do it properly

u can buy yur own additives to put in with yur fuel but no the petrol mentioned isnt just gonna clean yur injectors

I wouldn't put any faith in the fact that running some premium unleaded thru your car will 'clean the fuel system'. As far as I know - the only brand that actually claims their fuel has cleaning properties is shell. Recently on Drive TV - they had a very brief "segment" testing (if you could call it a test) Shell's claims. Basically they took a Holden Astra (or similar) that had around 130,000km's on it - never ran premium, then filled and used 3 tanks of optimax in one weekend. They then pulled the head off the motor to reveal (surprise surprise) - there was still gunk / carbon build up all thru the upper cylinder head / fuel system.

The only thing the bloke from Shell could say was "well it looks like it's started to loosen some of that build up" (WTF??BBQ!).

If anything - a 'fuel injector cleaning' fuel additive might be effective in cleaning injectors - but if $99 is what your workshop is quoting you for a ultrasonic injector clean - its probably not a bad price.

I had the injectors cleaned at the service about 4 months ago. I heard someone said it's good practice to fill up premium every few tanks to keep the injectors clean on an ongoing basis. Is this a myth?

Does carbon cleaning of the engine (where they run some strange solvent through it while running) do anything for the injectors?

Does carbon cleaning of the engine (where they run some strange solvent through it while running) do anything for the injectors?
Not in my experience. There wasn't any change I could tell, maybe the AWD isn't old enough although these people told me it was time. I wouldn't normally have done it as $99 to pipe in a solvent mixture into the engine is rather steep but for the curiosity factor.

Does carbon cleaning of the engine (where they run some strange solvent through it while running) do anything for the injectors?

No - the carbon cleaning solution is hooked up to one of the vacuum hoses which enter the plennum chamber (used the brake booster hose to do mine) and hence gets sucked thru the path air takes into your engine. Air doesn't pass thru your injectors - it just mixes with the fuel after the injectors.

I got a carbon blast done at a dyno day. Dynoed before and after the treatment - the car picked up 4kW (consitent over 3 back to back dyno runs) after the treatment. This was in an engine which had only done 63,000kms, a bloke in an XR6 Turbo with around 80-90,000 picked up close to 9kW from the same treatment.

Essentially what the carbon clean does is loosen all the crap that the EGR and PCV systems pump back thru your engine. Not only does it leave a greasy black build up all thru the inside of your plennum and intake manifold - it eventually builds up on the valves where it restricts air/fuel flow at probably the most critical point in the engine.

would it be costly to replace the injectors??? and get abetter type

would it be costly to replace the injectors??? and get abetter type

If you have a 3.0L PM Meh about the price of upgrading to 3.5L injectors. If you have a 3.5L - by all accounts it isn't worth it unless you're pushing BIG forced induction HP. Put it this way - Meh is now running 6G74 injectors in his 6G72, which he plans to turbo in the future....... as far as I know, he has no plans to go with bigger injectors than he has now.

bigger injectors are a waste of time.
i got them because i of the future upgrades im getting and needed mine cleaned at the time before i did my big mod
but all the mitsu models injectors can be plugged in, so u can go get some from an evo if u want and put them in but there really is no needed.

ah kool thanks for that. so how hard is it to take it out and clean it. or do i jus leave it in the car and run sum kinda of cleaner through it.

t hard at all.
u'll have to take the plenum off though to get to the rear banks..
once u have them off take them to some one where they will clean them out
i didnt see where mine were taken to caz my mate sent em off for me, cost me $60 for all 6 to be done, but i think its abit more then that to have them done

kool thanks for that. and did u feel a differance after they were clean. and will the fuel start squirting out when i take the injectors out???

kool thanks for that. and did u feel a differance after they were clean. and will the fuel start squirting out when i take the injectors out???

You will need to 'depressurise the fuel system' before you remove or disconnect anything associated with the fuel system. The instructions on doing this can be found in the gregorys workshop manual - basically involves unplugging the fuel pump relay and starting the car 8-10 (maybe more) times to get as much pressure as possible out of the system. Don't freak out when you take them out - you will loose a little fuel, but not much, just have a rag handy.