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      12-04-2013, 10:45 AM   #45
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Quote:
Originally Posted by z4z4z4 View Post
Supporting technical evidence of boxter dfi config provides valve back washing.
Hey like I said... trade in for Porsche. haha.

Obviously, the manufacturers implement DI differently.. here is some discussion of issues being found in Audi and BMW DI motors (note an RS4 owner saying he does not have problems with carbon buildup after he started hammering the car )

http://forums.rennlist.com/rennforum...n-buildup.html

Some discussion of N54 stuttering under heavy load being corrected by cleaning carbon build up

http://forums.bimmerforums.com/forum...heavy-throttle
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      12-04-2013, 01:50 PM   #46
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Quote:
Originally Posted by army_men View Post
Isn't there a injector recall for n54? or does it not concern our cars?

I was going to suggest buying the 6 injectors and doing the swap at a good tuner shop. It will be no where near $3K+, but then I realized injectors needs to be coded into DME.

What you could do, is buy the parts, write down the tow rows of numbers on each injector neatly, do the swap, then take it into BMW for them to code the DME for you. A US dealer quoted $140 for coding, throw in some Canadian tax that should come just under $100K. Good luck.
I wish but haven't heard anything about that.

As much as I'd hate to bite the bullet, I'd rather just pay the dealer to do everything and have the parts warranty for assurance. I'm nowhere competent enough to stray from that path, unfortunately.
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      12-04-2013, 02:35 PM   #47
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He is saying to buy the parts yourself and have an indy mechanic do the install, then take to BMW dealer for DME coding. Probably would cut your bill by a decent amount since a set of 6 injectors is about $1k (example below)

http://www.getbmwparts.com/partlocat...catalogid=4462
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      12-04-2013, 03:16 PM   #48
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Quote:
Originally Posted by nicknaz View Post
He is saying to buy the parts yourself and have an indy mechanic do the install, then take to BMW dealer for DME coding. Probably would cut your bill by a decent amount since a set of 6 injectors is about $1k (example below)

http://www.getbmwparts.com/partlocat...catalogid=4462
I understand but a warranty by an authorized dealer is preferable to an independent for my peace of mind.

Btw what is "DME coding"?

So, the proposed task is as simple as:
-I buy those 6 injectors
-any independent can install? nothing can go wrong here?
-after this, the car is still driveable to a dealer for this coding to be done? what happens if the coding is not done?

Thx.
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      12-04-2013, 05:34 PM   #49
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Could the original problem for Tranquility be associated with the fuel in his tank? Nicknaz touched on ethanol in our fuel. The temp was near the freezing point and it could contribute to condensed water in the fuel line with the gas/ethanol mixture. Wouldn't it be nice if it was a simple fix by conditioning the fuel.
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      12-04-2013, 11:12 PM   #50
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Quote:
Originally Posted by z4neb View Post
Could the original problem for Tranquility be associated with the fuel in his tank? Nicknaz touched on ethanol in our fuel. The temp was near the freezing point and it could contribute to condensed water in the fuel line with the gas/ethanol mixture. Wouldn't it be nice if it was a simple fix by conditioning the fuel.
Here's some info on the 91 octane gas that I use from Esso Canada:
http://www.imperialoil.ca/Canada-Eng...uels_fuel.aspx

That would be ironic (for me) if this Esso gas is the prb. I specifically switched from another brand to Esso because the 1st brand caused the 'humming' noise associated w/ the LPFP and this Esso gas was fine. I know, not the same prb, but would be funny. I've been using this Esso gas for the longest time, so not sure if it was the gas if the prb should've occurred earlier?

I'm going to head to Canadian Tire later on to try to get an addictive and we'll see. So far, the car has been running fine, so no idea what to expect. I'm not gonna automatically shell out $3K+ w/o a fight!
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      12-05-2013, 07:28 AM   #51
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The fuel on a regular basis is probably fine. On occasion, when I lived in CT, I would get a tank full that had more than its share of moisture. Usually an additive cleared up the issue.
When I was heavily into Corvettes in the past, the c5 (1997- 2004) would have a fuel gauge sending unit in the tank that would stick on occasion. GM would have to pull one of the tanks and replace the unit. It was a group of members on a forum like this one that got the point across that Techron in Chevron gas fixed the problem. After using the Techron additive for a tank or two, the sticking sending unit miraculously would cure itself.
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      12-05-2013, 09:47 AM   #52
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Esso i think is pretty terrible gas. At least go 91 Shell, and 94 petro-canada.

Not sure on additives, never really fiddled with them.

DME coding is registering the individual injector tolerance level into the ECU, each injector has a slightly different tolerance, no two are perfectly identical. So during testing the injectors BMW writes down the numbers on the side of the injectors, and later codes them into the ECU.

If you don't code DME, I'm not sure what would happen. no idea at all.
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      12-05-2013, 02:27 PM   #53
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Quote:
Originally Posted by army_men View Post
Esso i think is pretty terrible gas. At least go 91 Shell, and 94 petro-canada.
Why is Esso terrible? I moved from Petro's 91 to Esso's 91 to get away from the humming noise. Is Petro's 94 that much better than their 91 and also doesn't come w/ the humming noise? Haven't tried Shell out either: how would you rank all those brands? Thx.
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      12-05-2013, 06:31 PM   #54
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Internet chatter here in the US suggest shell and chevron have the 'best' additive packages but i haven't gotten any thing better than anecdotes from colleagues who used to work in the fuel business

for what it is worth, I use Costco 91 + Sunoco 100 in a 3:1 ratio
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      12-07-2013, 12:14 AM   #55
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I'm really beginning to think that this is cold-weather-related. No CEL but the engine start was not smooth. Once I'm running, no problems...if the injectors are defective, shouldn't I go into limp mode/stall? Funny thing is that the SA said it shouldn't be dependent on cold weather, if the injector(s) fail, they fail regardless. So, any guesses why I'm getting rough starts whenever (but only) in below freezing temperatures?
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      12-07-2013, 11:05 AM   #56
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Quote:
Originally Posted by nicknaz View Post
Internet chatter here in the US suggest shell and chevron have the 'best' additive packages but i haven't gotten any thing better than anecdotes from colleagues who used to work in the fuel business

for what it is worth, I use Costco 91 + Sunoco 100 in a 3:1 ratio
What do you do, drive up to LA to buy Sunoco?
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      12-08-2013, 12:30 PM   #57
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Quote:
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What do you do, drive up to LA to buy Sunoco?
San Diego has some locations

http://www.davebarton.com/Unleaded_Racing_Fuel_in_SoCal
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      12-08-2013, 12:37 PM   #58
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Quote:
Originally Posted by nicknaz
Internet chatter here in the US suggest shell and chevron have the 'best' additive packages but i haven't gotten any thing better than anecdotes from colleagues who used to work in the fuel business

for what it is worth, I use Costco 91 + Sunoco 100 in a 3:1 ratio
By that do you mean you mix at 3:1 or do you fill with Sunoco every fourth tank? What's the rationale?
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      12-08-2013, 01:43 PM   #59
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Quote:
Originally Posted by nicknaz View Post
Thanks. Maybe I'll give the N54 a Christmas present tank full for the heck of it. Haven't had any thing good in it since doing the ED.
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      12-09-2013, 11:18 AM   #60
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Quote:
Originally Posted by Crazykoh View Post
By that do you mean you mix at 3:1 or do you fill with Sunoco every fourth tank? What's the rationale?
Mix 3:1

I really enjoy my car and drive it hard such that the oil is 260F+ on a regular basis (it doesn't take much... just sitting in traffic and a few consecutive wide open throttle pulls on off ramps and merging can do this). And I live in CA where 91 octane is more like 89 octane elsewhere (check out the Cobb and other forums for more info on this).

This mix brings my oil quality to "93 octane" and if you believe what is posted on Cobb and other sites, it is really just bringing the fuel quality up to the level of 91 octane elsewhere in the US

I figured it makes sense to get a bit more protection from detonation given how I use the car. I am not expecting power gain or any other benefits other than more safety margin from detonation. If I had access to 93 octane I wouldn't bother with this.
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      12-09-2013, 03:01 PM   #61
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^
Nick>
Please don't use scary words like "detonation" w/o explanation to newbies like me... What exactly do you mean?
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      12-09-2013, 06:44 PM   #62
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Quote:
Originally Posted by tranquility View Post
^
Nick>
Please don't use scary words like "detonation" w/o explanation to newbies like me... What exactly do you mean?
For stock car driven conservatively.. no worries...

For what it is worth, check out this wiki:

http://en.wikipedia.org/wiki/Engine_...f_pre-ignition

If you are extremely paranoid about 'detonation', you can use the datalogging feature on something like a Cobb accessport and check for the 'timing adjustment' column having a negative adjustment in 3 or more adjacent cylinders during WOT pulls in 3rd gear.
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      12-09-2013, 07:44 PM   #63
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Quote:
Originally Posted by nicknaz
Quote:
Originally Posted by Crazykoh View Post
By that do you mean you mix at 3:1 or do you fill with Sunoco every fourth tank? What's the rationale?
Mix 3:1

I really enjoy my car and drive it hard such that the oil is 260F+ on a regular basis (it doesn't take much... just sitting in traffic and a few consecutive wide open throttle pulls on off ramps and merging can do this). And I live in CA where 91 octane is more like 89 octane elsewhere (check out the Cobb and other forums for more info on this).

This mix brings my oil quality to "93 octane" and if you believe what is posted on Cobb and other sites, it is really just bringing the fuel quality up to the level of 91 octane elsewhere in the US

I figured it makes sense to get a bit more protection from detonation given how I use the car. I am not expecting power gain or any other benefits other than more safety margin from detonation. If I had access to 93 octane I wouldn't bother with this.
Thanks for the info. Here in NC, I can pump 93 at shell and bp. Lucky.
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      12-10-2013, 03:06 AM   #64
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Crap, this time the CEL was on for the whole trip, not as shaky and didn't stall, but it was on the whole time...arrgh, must I spend that $3K+? I've been putting off buying any addictives, maybe try that first.
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      12-10-2013, 07:09 AM   #65
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Tranquility, are you still on the same tank of fuel? If you filled up, was it at a different station? That might help to eliminate the fuel situation.
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      12-10-2013, 01:34 PM   #66
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Quote:
Originally Posted by z4neb View Post
Tranquility, are you still on the same tank of fuel? If you filled up, was it at a different station? That might help to eliminate the fuel situation.
I'm still w/ Esso but been filling at a new station just recently...not sure if that may be a factor. Will keep monitoring. Thx for the observation.
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