|
|
|
|
|
|
BMW Garage | BMW Meets | Register | Today's Posts | Search |
|
BMW 3-Series (E90 E92) Forum
>
Problems with Surging/non-smooth feeling when cold
|
|
08-07-2013, 02:56 AM | #1 |
New Member
3
Rep 8
Posts |
Problems with Surging/non-smooth feeling when cold
My problem is when I am in any map (JB4 ISO G5) apart from stock it is not smooth like stock.. very lurchy in first and when changing into 2nd it hesitates briefly like a missfire or stall ?? very weird.. I think I need to change the plugs at minimum and possibly coilpack #1 because it had thrown a Service Engine Soon light while I was WOT but then the light went off as I was crusing. I did not stop when the light came on. i just put it back in drive and went the speed limit (45) then after about 3-5 miles it went off and drove normally.
Also at part/low throttle in D or DS (when JB4 Active, I only ever run Map 1 or 5 all I have is DCI) the car has a very uneven surge type feeling compared to when in stock Map 0. I'm think my solutions could be to change to coil pack one bank 1 (Cyl 1) as well as ALL of the spark plugs because I went into my mech so he could diagnose the codes because i did have the JB4 check for codes and it did find them.. I didn't know at the time that I could read them without a computer myself.. I was also considering an intake valve clean via walnut shell blasting. My final thing I can think of to resolve the surging uneven feeling on wot is to update the firmware of the JB4. I purchased mine off the forum so i'm not sure what version it currently has on it. I have the bms cable to be able to connect and update firmware, I just dont have a pc or have the cable connected. Do you think these fixes could resolve the problems I'm having? any help would be much appreciated... short of sending a log to terry@BMS. Kind Regards. Update: I Just put in Lucas Oil "Deep Clean fuel system cleaner" to my tank. I thought I was noticing a bit a difference, but while racing a Supra today (I Won, JB4 Map5 + BMS DCI) I, probably got up to about 80mph before hitting traffic up ahead at the lights.. I experienced a ServiceEngineSoon (SES) light right after the run. I put trans back into D continued to drive down the road and when I came to the next set of traffic lights my car was idling rough (like what I would call a missfire). I then, against my better judgement, continued to drive to my intended destination. and then about 2 miles later, 4mins with traffic, the light went off and the car ran normally. I have since been timid to go WOT until I get a better idea of what is happening, but I have gone about 50% throttle with no problems.. Car seems to start fine as well.. Just rattles like a sumunabitch! (Not turbo/wastegate related as far as I Know as the rattle goes away after a short period of time and it does not resonate with the engine when revving slightly (3k max). Please Brainstorm with me people! |
08-07-2013, 03:57 AM | #2 |
Brigadier General
1254
Rep 4,088
Posts |
What firmware version are you running on the jb4? Certain recent versions had surging issues that have since been addressed in the latest updates.
|
Appreciate
0
|
08-07-2013, 01:13 PM | #4 |
Captain
148
Rep 965
Posts
Drives: e92 m3
Join Date: Feb 2011
Location: staten island ny
|
how many miles on ur plugs?I used to get that on my old plugs,when tuned u should change them every 15-20k
__________________
e92 m3 dct
gintani stage 2+ full ethanol custom pulley and meth kw clubsport,ap racing radical,volk te37sl,akrapovic rear,recaro profi xl,voltphreaks battery |
Appreciate
0
|
08-07-2013, 01:14 PM | #5 |
3441
Rep 79,211
Posts
Drives: C6 Z06, 09 335i, 10 335xi
Join Date: Dec 2008
Location: www.TopGearSolutions.com
|
|
Appreciate
0
|
Bookmarks |
Tags |
coil, injectors, jb4, spark plug |
|
|