[Alex D]

One item I forgot to mention ... before doing my 4K rpm run I filled up with Shell gas and also added two bottles of Chevron Techron Concentrate (each indicated for up to 12 gal. gas) to the tank. I am sure the Techron is helpful in burning out carbon deposits. Toady after another few 10 minute 4K rpm runs on my way to work and back all hesitation or pulsating is completely gone now.

I am planning to run Techron once every three months and also do a 15 minute or so 4K rpm run at least once a week on my way in or home. Car runs and idles so much better too ...

YEAH!!!

[RoundelM3]

Techron is good stuff, but it won't help the valves, since no fuel passes over them in our direct-injection engines. It will help with anything inside the fuel system and combustion chamber (piston tops, etc.), though. I use it every few months myself.

[Alex D]

Originally Posted by roundel335

Techron is good stuff, but it won't help the valves, since no fuel passes over them in our direct-injection engines. It will help with anything inside the fuel system and combustion chamber (piston tops, etc.), though. I use it every few months myself.

I can be helping the combustion chamber and exhaust vales though. Intake vlaves are obviously a problem of DI gas engines for any manufacturer. Think only BMW engines are a problem? Just take a look at Audi forums and the issues they have with their FSI and TFSI engines, especially the S and RS series V8 ... huge build up on the intake valves ...

[bolinp78]

I had a HPFP replacement, and I've noticed this happening as well, although mine does not often happen under heavy acceleration. It'll happen most often when I'm going from a stop, like after sitting at a stoplight. It can get pretty jerky. They've tried reprogramming, which did not help. It's pretty tough to replicate, so I'm probably just going to live with it and get a new car when my warranty runs out.

[1N54E92]

Originally Posted by Blubaron79

2 guesses:

Injector or a cylinder misfiring.

most likely the injectors are going bad...you should take the car back to the service department and have them perform a pressure test on the injectors.

[RoundelM3]

Originally Posted by bolinp78

I had a HPFP replacement, and I've noticed this happening as well, although mine does not often happen under heavy acceleration. It'll happen most often when I'm going from a stop, like after sitting at a stoplight. It can get pretty jerky. They've tried reprogramming, which did not help. It's pretty tough to replicate, so I'm probably just going to live with it and get a new car when my warranty runs out.

So why don't you try our "method" of "self-cleaning"? It's worth a half-hour of your time and a little gasoline, isn't it? Sounds like yours is more severe, though, and might be an injector problem if it's happening at idle and no load.

[RoundelM3]

Originally Posted by Alex D

I can be helping the combustion chamber and exhaust vales though. Intake vlaves are obviously a problem of DI gas engines for any manufacturer. Think only BMW engines are a problem? Just take a look at Audi forums and the issues they have with their FSI and TFSI engines, especially the S and RS series V8 ... huge build up on the intake valves ...

Wonder if it does anything for our piezo-type injectors? I'd think it would, considering how effective it is in other engines.

[Alex D]

Techron

[Doenermann]

Going to try this myself, although my problem is likely dinan related (despite them claiming no knowledge of problems with stage 1 )but there could still be some build up after 26k miles.

Is engine load a factor or just keeping it at 4k for 30 minutes? I.e. Would 2nd gear at 40mph or 3rd gear at 60 accomplish the same result as 4th at 80?

[RoundelM3]

Load is a factor; best done in 4th at 75-80, as you're pushing more wind, hence more loading which increases the effect. I don't think you have any Dinan problems, unless there's something quirky about Stage 1; my Stage 2 has never given me any issues at all.

[Doenermann]

Originally Posted by roundel335

Load is a factor; best done in 4th at 75-80, as you're pushing more wind, hence more loading which increases the effect. I don't think you have any Dinan problems, unless there's something quirky about Stage 1; my Stage 2 has never given me any issues at all.

Not to go off topic too much, but last I heard from Dinan was in late June. At that point, they were aware of a random bunch of stage 2 cars which experienced this type of issue (15 cars or so throughout the US), but no problems with stage 1. In fact, when these cars were flashed back to stage one, the problem went away. Makes me wonder if there's nothing wrong and all those cars just need to blow off some carbon!

My issue started when I first got the Dinan software, hence I thought they were related. Perhaps the new software amplified the issue. But I'll find out soon enough if the problem vanishes. Would Techron be a good idea for the 4k run specifically? You didn't seem to think so in your earlier post , but others did.

[Alex D]

Originally Posted by Doenermann

Not to go off topic too much, but last I heard from Dinan was in late June. At that point, they were aware of a random bunch of stage 2 cars which experienced this type of issue (15 cars or so throughout the US), but no problems with stage 1. In fact, when these cars were flashed back to stage one, the problem went away. Makes me wonder if there's nothing wrong and all those cars just need to blow off some carbon!

My issue started when I first got the Dinan software, hence I thought they were related. Perhaps the new software amplified the issue. But I'll find out soon enough if the problem vanishes. Would Techron be a good idea for the 4k run specifically? You didn't seem to think so in your earlier post , but others did.

Blablablablabla ...

I phone Dan in tech support at Dinan at least every two weeks since last September when I flashed the stage 2 and got these symptoms. Nice guy to chat to but all blablablablabla ... never once returned a call he promised to return or call back .... I spent all the time calling ..... they HAD NO IDEA HOW TO HELP THIS ISSUE WHATSOEVER !! All kinds of this or that causing this ... blablabla ... only 20 cars in the US are doing this ... Blablabla ...( note ... from talking to them .... my local BMW dealer has probably more 335i' s with that this with this issue!)

After I never got promised call-backs from Dan I finally gave up on them earlier this year. Never A SHRED OF HELP AT ALL from Dinan.

We have three cars all the time and get a new car every three years. If there are BMW's in our future I will not ever get a dinan tune again. I spent hours on the phone getting a ton of blablablabla and not a single piece of useable help ... again Dan at Dinan is a nice guy but doesn't return calls he promises to return and couldn't help. To me they have been WORTHLESS in the customer support department after spending that kind of money for stage 2 flash plus the two hours my dealer charges to do it.

"DONE WITH DINAN" is my new slogan ... seriously thinking about getting a vanity plate with this

[Potty_Pants]

Originally Posted by Alex D

Blablablablabla ...

I phone Dan in tech support at Dinan at least every two weeks since last September when I flashed the stage 2 and got these symptoms. Nice guy to chat to but all blablablablabla ... never once returned a call he promised to return or call back .... I spent all the time calling ..... they HAD NO IDEA OR NO INTENTION HOW TO HELP WHATSOEVER !! All kinds of this or that ... blablabla ... only 20 cars in the US ... Blablabla ...( my local BMW dealer has more that that with this issue!)
I finally gave up on them. Never A SHRED OF HELP AT ALL from Dinan.

We get a new car every three years and future BMWs will not ever get a dinan tune again. I got hours of blablablabla... from Dan at Dinan but not help really. They are WORTHLESS in the customer support department.

"DONE WITH DINAN" is my new slogan ... seriously thinking about getting a vanity plate with this

+1

is your slogan registered... or can i use it too ?


ppp

[Alex D]

Originally Posted by Potty_Pants

+1

is your slogan registered... or can i use it too ?


ppp

Sure ... the more the merrier .. it's not trademarked

[Quisp]

Had this problem with my car. Started after fuel pump replacement and software update. The got it flashed back to Stage 3 and that is when the surging under acceleration began. Worked with Dinan as much as they could being in a different state. Couldnt get it figured out long distance so they had the car shipped to them via covered transport. Spent some time working on it and shipped it back to me. Changed out injectors and few other things and it runs fine now.

[RoundelM3]

All I can say is that I'm sorry those of you who had Dinan now think that you need to trash them because they didn't help you. Like Quisp's experience, it usually gets traced to something other than the software - Dinan has thousands of other happy customers like myself who, after 10 years and 3 different cars, have never once had a problem. Every car is different in some small way, and I doubt you'd have had any better results with another brand of tune.

Getting off topic here, though - Doenermann, Techron certainly won't hurt on your 4K run. I put it in my car every 90 days just to keep everything else in the fuel system clean. It's recommended by Porsche and a number of other high-performance car manufacturers.

[Alex D]

Teh one thing I forgot to mention was that I had the HPFP recall done at my dealer in April. They replaced the fuel pump and changed out three injectors, then re-flashed the computer with teh latest BMW software and then the Dinan S2 flash. All of this had absolutely no impact on teh issue. It was the same issue before and after the work was done.

[Alex D]

Originally Posted by roundel335

All I can say is that I'm sorry those of you who had Dinan now think that you need to trash them because they didn't help you. Like Quisp's experience, it usually gets traced to something other than the software - Dinan has thousands of other happy customers like myself who, after 10 years and 3 different cars, have never once had a problem. Every car is different in some small way, and I doubt you'd have had any better results with another brand of tune.

Getting off topic here, though - Doenermann, Techron certainly won't hurt on your 4K run. I put it in my car every 90 days just to keep everything else in the fuel system clean. It's recommended by Porsche and a number of other high-performance car manufacturers.

Good for those happy customers. It is not so much the issue ocurring that bothers me most. What probably bother me most about Dinan is the following:
- Dan said again and again that they will have a fix for this
- He never followed up with me or called back when he promised to do so
- If this is an honest BMW issue that can have many reasons rooted in teh individual car, Dinan should let us know and refund the money for the flash after we uninstalled it.

It is the recurring promise to find/fix the issue, committments then not kept and finally not offering up to uninstall and reimburse the customer for the flash if the car cannot be made to work with it that bothers me. I simply expect that from a vendor of expensive enthusiast items to stand behind tehir product. They sure liked to take my money for the flash ...

[RoundelM3]

Alex - that does bum me out as well, although I've not dealt personally with anyone at Dinan, never having had a reason to. Have you tried getting through to Steve? If nothing else, make him aware of what's going on. Might be that he'd override Dan's inability to resolve the issue. It's certainly worth a try, and if you can't find Steve's email address, try writing an actual letter addressed to him and mail it. At least that way it's on paper. I've always found that if one person proves difficult to deal with, try to find another contact. This doesn't sound like the Dinan I've been working with since 2001.

[Potty_Pants]

http://www.e90post.com/forums/showth...ighlight=dinan

Dan's a nice guy on the phone but the follow-thru is lacking.

ppp

[Alex D]

Originally Posted by roundel335

Alex - that does bum me out as well, although I've not dealt personally with anyone at Dinan, never having had a reason to. Have you tried getting through to Steve? If nothing else, make him aware of what's going on. Might be that he'd override Dan's inability to resolve the issue. It's certainly worth a try, and if you can't find Steve's email address, try writing an actual letter addressed to him and mail it. At least that way it's on paper. I've always found that if one person proves difficult to deal with, try to find another contact. This doesn't sound like the Dinan I've been working with since 2001.

Does this http://www.e90post.com/forums/showth...ighlight=dinan sound like the Dianan you have been working with since 2001 ?

I wasn't expecting a lot ... just simple down to earth, honest basic care about a customer. What I got was only glad handling.

[Doenermann]

Haha, their customer service never changes. Just last month I called them twice about a problem, then they suppossedly called the dealer who said they did not receive a call (but they supposedly left Dinan several messages), after which I called back Dinan who said the Dealer never called. This went on for a few days during which my car remained at the dealer, but it had already been there over two weeks anyway for other repairs. So same shit, different day.

In the end, Dinan had no solution (regarding the hiccuping which started the day the software was first flashed) and decided to reflash the car anyway with the same software. This issue was on an X6 but same n54 motor, maybe only this software is flawed and they don't give a shit since I'm probably the only customer who bought it anyway. Balls...