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12-04-2013, 10:45 AM | #45 | |
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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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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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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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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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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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HerrK - 2021 X5 40i M Sport l PCD l Atlantis Blue/Ext'd Tartufo Merino l M Sport w/blue Calipers l Matt Popular l HK Sound l 740's l Exec & Drive Pro Pack Sold w/Great Memories - E89 Z4 l ED 2010 l 2011 35i l Crimson/Ext'd Coral Red w/Alum l 6 sp MT l Prem Sound l Sport Pack l 296's |
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12-08-2013, 12:30 PM | #57 |
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12-08-2013, 12:37 PM | #58 | |
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12-08-2013, 01:43 PM | #59 | |
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HerrK - 2021 X5 40i M Sport l PCD l Atlantis Blue/Ext'd Tartufo Merino l M Sport w/blue Calipers l Matt Popular l HK Sound l 740's l Exec & Drive Pro Pack Sold w/Great Memories - E89 Z4 l ED 2010 l 2011 35i l Crimson/Ext'd Coral Red w/Alum l 6 sp MT l Prem Sound l Sport Pack l 296's |
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12-09-2013, 11:18 AM | #60 | |
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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, 06:44 PM | #62 | |
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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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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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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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