[faded67]

So how long do our injectors generally last before we need to replace them?

[lawwailok]

Originally Posted by faded67

So how long do our injectors generally last before we need to replace them?

ALL of my injectors were replaced at 34k miles.....

[faded67]

Originally Posted by lawwailok

ALL of my injectors were replaced at 34k miles.....

Did you have an issue and it was diagnosed or did you just go ahead and replace them?

[lawwailok]

Originally Posted by faded67

Did you have an issue and it was diagnosed or did you just go ahead and replace them?

CEL SES lights came on, car was shaking SO violent on both driving and stationing. idle jumped from 1000 to 400rpm to 1000 constant, very bad smell from exhaust.
car was being tow to the dealer and 3 days later, all new injectors were replaced, and that was only exactly 1000 miles after my new HPFP.

[Belarus]

Originally Posted by I335

Are you sure you're not sipping off the bottle too?

LMAO... good one...

Waste of $$$ IMHO if you fill up at Tier 1 brand name gas stations (Shell, Sunoco, Exxon/Esso...) vs moms & paps station with 91 to 94 Oct...most of them already adding cleaning agents to their fuel...

[rbaldwin28]

Ethanol eats rubber and other plastics but auto makers have know about this for years and don't use them in fuel systems anymore because up to 10% ethanol can be found it US fuel. The crystals in our injectors are used because when current is passed though them they vibrate and atomize fuel as well as being able to control flow very effectively. Ethanol will not eat them as far as I know since crystal is like the second hardest naturally occurring material after diamonds.

[cstavaru]

Originally Posted by rbaldwin28

since crystal is like the second hardest naturally occurring material after diamonds.

Crystal is a form of chemical presentation, not a type of chemical element like carbon (from diamond). It depends what the crystal is made of. In the piezoelectric injectors, they use quartz crystals but these are not so hard as far as I know.

However, I think any injector can clog, regardless of what is made of.

[rbaldwin28]

Originally Posted by cstavaru

Crystal is a form of chemical presentation, not a type of chemical element like carbon (from diamond). It depends what the crystal is made of. In the piezoelectric injectors, they use quartz crystals but these are not so hard as far as I know.

However, I think any injector can clog, regardless of what is made of.

Yea, I am sure they can or we would not need fuel filters on the DI motors. Quartz is not as soft as rubber or plastic though right? So carbon is the element and diamond is the presentation of the element. OK, got it.

[dcorn]

Hmm, I was just at the dealer yesterday and he recommended that they do some sort of injector cleaning service to get rid of the carbon build-up. Figures that it really doesn't do much and I can just buy a bottle of the stuff and put it in myself.

[newbieman78]

GUYS BEWARE.......I used one of these fuel injector cleaners in my gas tank 1 week ago, and now I got my first HPFP failure, and I am at 33000 miles on my car without any problems before. I think maybe the cleaner did it to my pump or pushed it over the limits.

[Jed]

Originally Posted by newbieman78

GUYS BEWARE.......I used one of these fuel injector cleaners in my gas tank 1 week ago, and now I got my first HPFP failure, and I am at 33000 miles on my car without any problems before. I think maybe the cleaner did it to my pump or pushed it over the limits.

Could be coincidence and your HPFP was on it's way. I've run bottles of Ventil Sauber (which will also clean injectors) in mine and I've got 72K miles on my car on the original HPFP.

Of course, now that I just said that, it'll probably go up now.

[shifterboy45]

for those who are not familiar with the BMW (Techron) additive, one thing that is not is

Ethanol based

if you have a chance, look up the initial study by Chevron, in which BMW did contribute a lot to... this is a fuel suppliers body of information concerning the effectivness of fuel additive against combustion chamber deposits.

Techron is actually a solvent -- which is why its heavier that gasoline.
it shoud not affect the injectors in the concentrated form, as it is used industry wide.. not just in Chevron gas formulations -- 76 uses the as type of solvent in their gasolines for the detergent qualities.

it may not prove to be a good injector cleaner of the N54, but it will reduce the combustion chamber deposits that are form near the top of cylinder.

the reason it works is -- that is not affected during combustion, and its slovent properties are increased by the heat and pressure in engine during the power stroke. after regular use it will considerably reduce the deposits that exist in the cylinder.. if any --

this was intended to help with the M20 engines erratic injector spray pattern, which was caused by "heat soak" -- injector residing in the cylinder head + engine shut down, injector head and pintle absorbed heat and lingering gasoline on the injector cause deposits which inhibited correct spray pattern. rather than do the walnut shell process to clean the injector and intake tract, this formulation was proven to redue these type of deposits, and also found after extensive testing its cleaning properties extended into the cylinder itself... so not only was the injector cleaned but the deposits in cylinder were reduced also.

so i doubt that is will have a great affect on the DI injector, but it will help reduce the CC deposits if used every once in a while. I'm sold on it since i've run this in every injected car ive owned-- including my wifes Honda, with good success.. so its not a mental thing-- it wont increase performance -- just restore it to good operating condition.

[newbieman78]

i dunno...but I do know i wont ever use fuel injector cleaners again, coincidence or not

[csthomason]

Originally Posted by I335

Are you sure you're not sipping off the bottle too?

He must be drinking the stuff, or something in his fuel system got cleaned out with the octane booster somehow.

For anyone who is not familiar, higher octane fuel has lower potential energy than the lower octane fuel does. Higher octane is used to prevent knocks, (premature fuel ignition) in the engine which can very quickly damage it.

[RFGuy_KCCO]

Link to a good discussion about this topic:

http://www.bobistheoilguy.com/forums...97&nt=3&page=1

[David1]

Originally Posted by dcorn

Hmm, I was just at the dealer yesterday and he recommended that they do some sort of injector cleaning service to get rid of the carbon build-up. Figures that it really doesn't do much and I can just buy a bottle of the stuff and put it in myself.

Run away from that guy! The professional Injector cleaner kit that the dealers use states that the cleaner is not to be used on DI fuel systems. Tank additive is different but also ineffective on DI Injectors.