E90Post
 


Bimmer Retrofit
 
BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N54 Turbo Engine / Drivetrain / Exhaust Modifications - 335i > Chevron Techron - It Works! rough idle eliminated



Reply
 
Thread Tools Search this Thread
      05-17-2011, 05:33 PM   #1
orionredwing
Captain
 
Drives: 335i Sedan, 135i Coupe
Join Date: Dec 2006
Location: San Jose

Posts: 724
iTrader: (0)

Garage List
2007 335i  [5.00]
Chevron Techron - It Works! rough idle eliminated

There have been many threads discussed over the years on the effectiveness of fuel injector cleaners on direct injection (DI) engines. I searched, and as there hasn't been a recent thread, I wanted to share my recent experience.

I'm a big fan of Techron on my previous cars; I used it on a regular basis and treated it as periodic maintenance. BUT due to discussions in this forum, and the doubts raised on its effectiveness in DI engines, I chose NOT to use Techron on my 335i for the past 70K miles....until now. (This gives you an idea how powerful forums are in influencing behavior, especially since I'm a big believer in Techron to begin with).

With >70K miles, my car was beginning to idle rough with the occasional blurps and hiccups every 5-10 secs that indicates a minor misfire. I track my car, and despite multiple track days, with multiple 20-30 min sessions of constant WOT, no actual misfire codes were thrown.

Around 70K miles, I changed out my spark plugs. Upon removal, I noticed that the plugs for cyl #3 was black with fuel smell. I installed new plugs AND for the heck of it, also swapped coil pack positions to troubleshoot. The car was still idling rough. 10 miles later, and the next morning (after engine was cool), I pulled the plugs to reinspect, and here's what I saw. (Note: Other users have mentioned the same symptoms, and saw this in cyl 6, but mine was cyl 3)

NEW PLUGS w/ 10 MILES:


With only 10 miles, the brand new plug was black w/ fuel smell. Other new plugs next to it in the picture were fine. With coil packs swapped, it looks like I have a bad injector. That sucks!

At that point, I had an old bottle of Chevron Techron lying around, and decided to give it a shot (nothing to lose at this point). It was the smaller 12 gal treatment bottle, so I filled up half a tank and ran it through. After the treatment, I noticed an improvement. The rough idling and blurps went from once every 5-10 secs, to once every 10-20 secs. It helped, but looks like I'm stuck with the rough idle.

Recently, Chevron Techron came on sale at Kragen's (O'Reilleys - buy 1 get 1 free). It's been 3K miles and 4-5 track days since that last treatment. With the sale going on, I decided to try Techron again, and opted for the larger bottles that treat 20 gallons.

RESULT: I ran 1 bottle through.....and my rough idle is now completely gone!!!

Wow, I came in with low expectations. For years, I listened to all the naysayers saying it doesn't work on DI engines. Their arguments made so much sense that a strong believer such as myself stopped using it.

Kragen (O'Reiley's) currently has a sale (buy 1 get 1 free) good till 5/24. Sorry, it's been going on the past 3 weeks, so I was surprised nobody posted the sale. For those experiencing rough idle, I suggest giving it a try. Use 2 treatments and see if it helps you. Maybe it works, maybe it doesn't, but at $11.99 + tax for 2 bottles, it's waaaay cheaper than replacing injectors, so is a no-brainer to try in my book.

I believe the inherent problem is still there, and the Techron treatment only serves to mitigate the symptoms. It's either bad injector on cyl 3, or carbon build up. But remember, with NO misfire codes thrown after multiple track days, I can live with using Techron on a periodic maintenance schedule. I went back and bought 6 more bottles (3 + 3 free)
__________________

PROcede | AMS FMIC | AR Catless DPs | AR Oil Cooler | BMS DCI
Wavetrac LSD | KW V3 w/ Swift Springs | M3 Front Suspension

Last edited by orionredwing; 05-17-2011 at 06:27 PM.
orionredwing is offline  
0
Reply With Quote
      05-17-2011, 05:43 PM   #2
blacknbean
Major
 
Drives: e92 335i
Join Date: Jul 2007
Location: SF

Posts: 1,024
iTrader: (2)

i like techron and usually buy it when its on sale. however it seems to make the car run crappy when its mixed with the gas ie less power etc. so i usually only use it when i go on long trips and burn through that tank of gas asap!
blacknbean is offline  
0
Reply With Quote
      05-17-2011, 05:53 PM   #3
dzenno
Banned
 
Drives:
Join Date: Feb 2006

Posts: 5,884
iTrader: (1)

Why not pull those plugs and post a pic again to compare?
dzenno is offline   Canada
0
Reply With Quote
      05-17-2011, 07:51 PM   #4
marv85
Colonel
 
marv85's Avatar
 
Drives: '07 335i MT
Join Date: Jun 2010
Location: Portland

Posts: 2,559
iTrader: (5)

Quote:
Originally Posted by dzenno View Post
Why not pull those plugs and post a pic again to compare?
+1 that would be very helpful
__________________
'10 E92 335i , COBB
marv85 is offline   United_States
0
Reply With Quote
      05-17-2011, 09:21 PM   #5
Stucks
Major
 
Stucks's Avatar
 
Drives: 2008 E92 335i
Join Date: Oct 2010
Location: Montgomery County, MD

Posts: 1,351
iTrader: (7)

So this is the stuff you used?


http://shop.advanceautoparts.com/web...ci_sku=7081073
__________________
Current: 2008 e92 335i coupe. FBO+e60 mix. Now with meth.
Previous: 2003 Honda Accord V6 coupe: AEM V2, zex 75 wet shot (sold)

Last edited by Stucks; 05-17-2011 at 09:27 PM.
Stucks is offline   United_States
0
Reply With Quote
      05-17-2011, 09:32 PM   #6
AhmEd_B_Stylin
Banned
 
AhmEd_B_Stylin's Avatar
 
Drives: BMW 335i
Join Date: May 2011
Location: Parlin, NJ

Posts: 208
iTrader: (0)

Need to give it a a try ASAP
AhmEd_B_Stylin is offline  
0
Reply With Quote
      05-18-2011, 08:50 AM   #7
Zeph
Major
 
Drives: 2008 E92 335i 6MT SGM CR/BD
Join Date: Jul 2008
Location: Southeast USA

Posts: 1,403
iTrader: (0)

Send a message via AIM to Zeph Send a message via Yahoo to Zeph
I use Redline fuel injector cleaner every so often. Good stuff.

... Lucas Oil makes a good one too.
Zeph is offline   United_States
0
Reply With Quote
      05-18-2011, 08:52 AM   #8
michaelalex17
Colonel
 
michaelalex17's Avatar
 
Drives: 335xi E92
Join Date: Aug 2010
Location: NY

Posts: 2,226
iTrader: (3)

techron FTW!!!
michaelalex17 is offline  
0
Reply With Quote
      05-18-2011, 09:02 AM   #9
Express
Major General
 
Express's Avatar
 
Drives: 06 330i
Join Date: Dec 2008
Location: The Promise Land

Posts: 8,701
iTrader: (17)

Garage List
2006 BMW 330i  [4.15]
im wondering if i should give this a shot..
Express is offline   Israel
0
Reply With Quote
      05-18-2011, 09:06 AM   #10
michaelalex17
Colonel
 
michaelalex17's Avatar
 
Drives: 335xi E92
Join Date: Aug 2010
Location: NY

Posts: 2,226
iTrader: (3)

Quote:
Originally Posted by express705 View Post
im wondering if i should give this a shot..
do it, its great
michaelalex17 is offline  
0
Reply With Quote
      05-18-2011, 09:07 AM   #11
Express
Major General
 
Express's Avatar
 
Drives: 06 330i
Join Date: Dec 2008
Location: The Promise Land

Posts: 8,701
iTrader: (17)

Garage List
2006 BMW 330i  [4.15]
i guess it cant hurt.. whats the worst thing that happens? i lose a few bucks?
Express is offline   Israel
0
Reply With Quote
      05-18-2011, 09:25 AM   #12
GeorgiaTech335coupe
Lieutenant Colonel
 
Drives: Black BMW 335i coupe
Join Date: Mar 2007
Location: USA

Posts: 1,884
iTrader: (0)

When people talking about Techron not being effective on this platform, they are talking about its effects on cleaning the intake valves. The intake valves will never see fuel or Techron which cleans them.

It could be possible that the Techron is slighltly cleaning a clogged injector nozzle or maybe washing the plug from carbon prior to combustion. Although, the time it would have to do this would be very, very small.
__________________
Legal Disclaimer: Anything I or anyone else says about my vehicle on this website(e90post.com or any affiliated or nonaffiliated sites), pertaining to modifications, is only to gain acceptance from my/our peers, and does not actually represent anything actually existing on my car, and thus, cannot be held against me in any issues, i.e. warranty claims, that may arise.
GeorgiaTech335coupe is offline  
0
Reply With Quote
      05-18-2011, 09:39 AM   #13
kjrulz
Mastermind
 
kjrulz's Avatar
 
Drives: girls krazy
Join Date: Jan 2009
Location: your mother

Posts: 1,361
iTrader: (5)

I don't have one in my area....I don't think I can get the deal online...I don't see how at least...wack
kjrulz is offline  
0
Reply With Quote
      05-18-2011, 09:45 AM   #14
max
Tired & Retired
 
max's Avatar
 
Drives: E93 2009 335i
Join Date: May 2011
Location: Alto, NM

Posts: 179
iTrader: (4)

Like the OP, I'm a long term believer in Techron, good to hear it also works for DI injectors.
max is offline   United_States
0
Reply With Quote
      05-18-2011, 10:25 AM   #15
wren57
Major
 
wren57's Avatar
 
Drives: 335i
Join Date: Jul 2010
Location: Birmingham, AL

Posts: 1,433
iTrader: (8)

Quote:
Originally Posted by GeorgiaTech335coupe View Post
When people talking about Techron not being effective on this platform, they are talking about its effects on cleaning the intake valves. The intake valves will never see fuel or Techron which cleans them.

It could be possible that the Techron is slighltly cleaning a clogged injector nozzle or maybe washing the plug from carbon prior to combustion. Although, the time it would have to do this would be very, very small.

+ a lot.
wren57 is offline  
0
Reply With Quote
      05-18-2011, 10:27 AM   #16
Syndicategt
Brigadier General
 
Syndicategt's Avatar
 
Drives: 335i
Join Date: Sep 2009
Location: Nor Cal

Posts: 3,732
iTrader: (11)

Quote:
Originally Posted by kjrulz View Post
I don't have one in my area....I don't think I can get the deal online...I don't see how at least...wack
You can buy this stuff anywhere (Autozone, O'rileys, PepBoys, Walmart, Target....)

I've used it in the past, seems to help the injectors....definately can't hurt them and for $10 you can't go wrong. I always do this right before an oil change though, since it is a fuel additive it's recommended you change your oil afterwards.

I'm getting my hands dirty this weekend and doing a deep scrub of my intake mani and valves
__________________
2008 BMW 335i e90 - Sold - Rob Beck Turbos / PROcede V5 / Aquamist HFS-4 / AR Downpipes / AE Exhaust / ER Comp FMIC / ER CP / TiAL BOV / Custom Intake / RPI Scoops / Quaife LSD / Swift-Koni Coilovers / DSS HS / Morr VS8.2 Sig Black / Michelin PSS / P3 Boost Guage / M3 body / M3 steering wheel / Adam's Rotors / Hawk HPS / SS lines /
Syndicategt is offline   United_States
0
Reply With Quote
      05-18-2011, 10:33 AM   #17
c4s335i
Second Lieutenant
 
Drives: 07 335i sedan
Join Date: Oct 2010
Location: Charlotte, NC

Posts: 266
iTrader: (0)

If you want to clean the intake valves, jut pull the vacuum line going to the recircs, get yourself about 4-5ft of vacuum tubing and an inline connector, buy some Throttle Body Cleaner, use the straw attachment, and spray it into hose with short bursts with the car running and your foot on the gas holding the engine at a steady 3k rpms. Each time you spray the RPMs will dip a bit, and wait for the engine to stabilize before spraying again. This process will take some time to go through a whole bottle of cleaner. This method works very effectively on removing gunk from the intake plenum and the valves. Just make sure that whatever type of TB or Carb cleaner you use says that it is safe for Oxygen Sensors. Most are these days, but double check.
c4s335i is offline  
0
Reply With Quote
      05-18-2011, 10:35 AM   #18
Syndicategt
Brigadier General
 
Syndicategt's Avatar
 
Drives: 335i
Join Date: Sep 2009
Location: Nor Cal

Posts: 3,732
iTrader: (11)

^ Sorry but carb cleaner alone will not clean all that carbon build-up off.....you need to SCRUB!
__________________
2008 BMW 335i e90 - Sold - Rob Beck Turbos / PROcede V5 / Aquamist HFS-4 / AR Downpipes / AE Exhaust / ER Comp FMIC / ER CP / TiAL BOV / Custom Intake / RPI Scoops / Quaife LSD / Swift-Koni Coilovers / DSS HS / Morr VS8.2 Sig Black / Michelin PSS / P3 Boost Guage / M3 body / M3 steering wheel / Adam's Rotors / Hawk HPS / SS lines /
Syndicategt is offline   United_States
0
Reply With Quote
      05-18-2011, 10:39 AM   #19
c4s335i
Second Lieutenant
 
Drives: 07 335i sedan
Join Date: Oct 2010
Location: Charlotte, NC

Posts: 266
iTrader: (0)

Correct it will not remove all of it, but it does work well in removing a good bit of it, especially if done regularly.

The best way of course is media blasting, but that's a bit more involved for most here.

Quote:
Originally Posted by Syndicategt View Post
^ Sorry but carb cleaner alone will not clean all that carbon build-up off.....you need to SCRUB!
c4s335i is offline  
0
Reply With Quote
      05-18-2011, 10:58 AM   #20
Bakeme521
Some say...
 
Bakeme521's Avatar
 
Drives: Fresh
Join Date: Mar 2010
Location: Baton Rouge n NOLA

Posts: 4,271
iTrader: (12)

Garage List
2007 BMW 335i  [4.04]
I actually over heard a tech yesterday telling a customer to put this stuff in their 335is when I was at the stealer. I guess I will have to give it a try bc my idle bounces quite a bit.
__________________

I have exhaust and an intake...
Bakeme521 is offline   United_States
0
Reply With Quote
      05-18-2011, 11:05 AM   #21
Clarkson
The Uninformed
 
Drives: 335
Join Date: Apr 2009
Location: Midwest

Posts: 61
iTrader: (1)

Has anyone tried Motorvac on the 335 yet? I'm not sure if it works on DI but I have read good things about it... Just never tried it.
Clarkson is offline  
0
Reply With Quote
      05-18-2011, 11:43 AM   #22
etichi
Slow,fast,slow, then you die.
 
etichi's Avatar
 
Drives: 335i 07,AA short shifter, COBB
Join Date: May 2010
Location: Orlando

Posts: 243
iTrader: (1)

How frequently?

Every month? Every couple of months? Every time I fill up?
etichi is offline   United_States
0
Reply With Quote
Reply

Bookmarks

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump


All times are GMT -5. The time now is 06:08 AM.




e90post
Powered by vBulletin® Version 3.7.0
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
1Addicts.com, BIMMERPOST.com, E90Post.com, F30Post.com, M3Post.com, ZPost.com, 5Post.com, 6Post.com, 7Post.com, XBimmers.com logo and trademark are properties of BIMMERPOST