Half throttle misfire

chancejat · 08-01-2010, 09:03 PM

My car has recently been having a part throttle(partial boost) misfire but runs fine at idle and WOT. it seems to only misfire at about 3-4k rpms under part thottle. I have no idle issues and the car starts fine. any ideas?
2007 AT with 72k with a new engine block and pistons 10k ago. running jb3 and dci, does it with the tune and without. Any ideas will be appreciated.
i got a cylinder 4 misfire code once.

luca335i · 08-01-2010, 09:37 PM

swap plug from cyl 4 to another cylinder and see if it still misfires on cylinder 4. If it does just change the plug or change all 6 for good measure. If not may be a coil pack or injector. Why the new block and pistons? Motor blew?

chancejat · 08-01-2010, 09:43 PM

thx...im gonna have to order a SP socket, so i have to wait......uugghhhh!

ETS Michael · 08-02-2010, 01:28 AM

In for results

chancejat · 08-02-2010, 06:57 AM

its gonna be about two weeks........

ETS Michael · 08-02-2010, 10:18 AM

I'm having the same problem. Interested to see what happens.

Thanks,

Michael

chancejat · 08-02-2010, 12:14 PM

Quote:

Originally Posted by ETS Michael

I'm having the same problem. Interested to see what happens.

Thanks,

Michael

What tune r u running?

ETS Michael · 08-02-2010, 12:43 PM

Stock :\ Do you drive long distances? I have a feeling my daily driving of 40 miles at 2000rpm is screwing with my adaptation tables. It feels like the car is running lean around 2500rpm.

chancejat · 08-02-2010, 12:50 PM

it started happening after 8 passes down the quarter mile... in one day..........at cruise-70-80 it runs fine. only when i accellerate at half-ish throttle. but ill be sure to let you know.

M3 Eater · 08-02-2010, 01:22 PM

I have this problem since new fuel pump, software, and fuel injectors....

I have had misfires in 1, 2, 3 and 4. Replaced fuel injector #1 and still having regular misfires in #2. Right now... the misfiire has been following the injector when I move it. Bringing it in tomorrow...

chancejat · 08-03-2010, 05:05 PM

i put in some techron concentrate with about 5 gal of fuel , drove for about another 100 miles and i cant get it to misfire today.......im going on a 900 mile trip thursday and will let you know if it comes back.

TriniJots · 08-03-2010, 11:33 PM

Fuel Injectors or Spark Plugs should be the problem, give them a check.
Good Luck! Hope everything works out

chancejat · 08-04-2010, 08:36 AM

if anyone is looking for injectors.....heres some dirt cheap!
http://cgi.ebay.com/ebaymotors/ws/eB...category=33554

ETS Michael · 08-07-2010, 03:14 PM

Received a call from the dealer on Friday saying they have a new software update for the misfires from the new flashes. I dropped my car off and they said the problem is cured, but they want to hold it tell monday (they don't work weekends) and make sure it has no cold start problems.
Michael

chancejat · 08-08-2010, 09:02 AM

my problem went away! i changed the plugs anyway and found all normal but cylinder one had a little black on it....hmmm....

ETS Michael · 08-10-2010, 10:26 AM

They swapped the injectors and plugs and my idle is perfect and mis fire is gone.

Michael

chancejat · 08-13-2010, 10:14 PM

its back................

ETS Michael · 08-16-2010, 12:06 PM

Bummer.. Mine seems to be ok right now. They had a software update for misfires. It was released end of last month.

OpenFlash · 08-16-2010, 12:12 PM

Quote:

Originally Posted by chancejat

My car has recently been having a part throttle(partial boost) misfire but runs fine at idle and WOT. it seems to only misfire at about 3-4k rpms under part thottle. I have no idle issues and the car starts fine. any ideas?
2007 AT with 72k with a new engine block and pistons 10k ago. running jb3 and dci, does it with the tune and without. Any ideas will be appreciated.
i got a cylinder 4 misfire code once.

What happened to the first engine? Maybe this could give us a hint as to the source of the current problem.

cn555ic · 08-16-2010, 12:14 PM

First engine????

chancejat · 08-19-2010, 07:27 PM

the first engine had some kind of cam issue and was bucking like crazy, then one day after i picked it up, i accelerated to test it and it threw a rod.
today i noticed that my misfire is only at lower rpms 2500-3500 with a high load. like if im doing 40 or 50mph and put it in 5th gear and accell all the way b4 the clicker it will misfire. but at WOT and high rpms its fine. i got a cylinder 6 misfire twice today...:-(

chancejat · 08-19-2010, 08:51 PM

coils??

08-01-2010, 09:03 PM	#1
chancejat First Lieutenant 17 Rep 310 Posts Drives: bmw Join Date: Mar 2010 Location: usa iTrader: (2)	Half throttle misfire My car has recently been having a part throttle(partial boost) misfire but runs fine at idle and WOT. it seems to only misfire at about 3-4k rpms under part thottle. I have no idle issues and the car starts fine. any ideas? 2007 AT with 72k with a new engine block and pistons 10k ago. running jb3 and dci, does it with the tune and without. Any ideas will be appreciated. i got a cylinder 4 misfire code once.
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08-01-2010, 09:37 PM	#2
luca335i Major 57 Rep 1,193 Posts Drives: 335I Sedan Join Date: Jan 2008 Location: Unknown iTrader: (3)	swap plug from cyl 4 to another cylinder and see if it still misfires on cylinder 4. If it does just change the plug or change all 6 for good measure. If not may be a coil pack or injector. Why the new block and pistons? Motor blew? __________________ Last edited by luca335i; 08-01-2010 at 09:42 PM..
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08-01-2010, 09:43 PM	#3
chancejat First Lieutenant 17 Rep 310 Posts Drives: bmw Join Date: Mar 2010 Location: usa iTrader: (2)	thx...im gonna have to order a SP socket, so i have to wait......uugghhhh!
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08-02-2010, 01:28 AM	#4
ETS Michael Major 76 Rep 1,155 Posts Drives: 335i Join Date: May 2009 Location: Vancouver, WA iTrader: (4)	In for results
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08-02-2010, 06:57 AM	#5
chancejat First Lieutenant 17 Rep 310 Posts Drives: bmw Join Date: Mar 2010 Location: usa iTrader: (2)	its gonna be about two weeks........
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08-02-2010, 10:18 AM	#6
ETS Michael Major 76 Rep 1,155 Posts Drives: 335i Join Date: May 2009 Location: Vancouver, WA iTrader: (4)	I'm having the same problem. Interested to see what happens. Thanks, Michael
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08-02-2010, 12:43 PM	#8
ETS Michael Major 76 Rep 1,155 Posts Drives: 335i Join Date: May 2009 Location: Vancouver, WA iTrader: (4)	Stock :\ Do you drive long distances? I have a feeling my daily driving of 40 miles at 2000rpm is screwing with my adaptation tables. It feels like the car is running lean around 2500rpm.
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08-02-2010, 12:50 PM	#9
chancejat First Lieutenant 17 Rep 310 Posts Drives: bmw Join Date: Mar 2010 Location: usa iTrader: (2)	it started happening after 8 passes down the quarter mile... in one day..........at cruise-70-80 it runs fine. only when i accellerate at half-ish throttle. but ill be sure to let you know.
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08-02-2010, 01:22 PM	#10
M3 Eater Major 36 Rep 1,054 Posts Drives: 335i Sedan Join Date: May 2010 Location: Unknown iTrader: (3) Garage List 2007 335i [0.00]	I have this problem since new fuel pump, software, and fuel injectors.... I have had misfires in 1, 2, 3 and 4. Replaced fuel injector #1 and still having regular misfires in #2. Right now... the misfiire has been following the injector when I move it. Bringing it in tomorrow... __________________ JB4 beta 15 ohms FSB,AEM inline filter/ CM 10, ETS fmic, ER custom made charge pipe,TSW Donnington 18's,Simitumo HTRZ3, Injen DCI, AR DPs, Forge DVs, AA SLD, Koni FSD, ZSP springs.
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08-03-2010, 05:05 PM	#11
chancejat First Lieutenant 17 Rep 310 Posts Drives: bmw Join Date: Mar 2010 Location: usa iTrader: (2)	i put in some techron concentrate with about 5 gal of fuel , drove for about another 100 miles and i cant get it to misfire today.......im going on a 900 mile trip thursday and will let you know if it comes back.
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08-03-2010, 11:33 PM	#12
TriniJots Driver 102 Rep 659 Posts Drives: 2021 M340i Join Date: Feb 2010 Location: South Florida iTrader: (3)	Fuel Injectors or Spark Plugs should be the problem, give them a check. Good Luck! Hope everything works out
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08-04-2010, 08:36 AM	#13
chancejat First Lieutenant 17 Rep 310 Posts Drives: bmw Join Date: Mar 2010 Location: usa iTrader: (2)	if anyone is looking for injectors.....heres some dirt cheap! http://cgi.ebay.com/ebaymotors/ws/eB...category=33554
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08-07-2010, 03:14 PM	#14
ETS Michael Major 76 Rep 1,155 Posts Drives: 335i Join Date: May 2009 Location: Vancouver, WA iTrader: (4)	Received a call from the dealer on Friday saying they have a new software update for the misfires from the new flashes. I dropped my car off and they said the problem is cured, but they want to hold it tell monday (they don't work weekends) and make sure it has no cold start problems. Michael
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08-08-2010, 09:02 AM	#15
chancejat First Lieutenant 17 Rep 310 Posts Drives: bmw Join Date: Mar 2010 Location: usa iTrader: (2)	my problem went away! i changed the plugs anyway and found all normal but cylinder one had a little black on it....hmmm....
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08-10-2010, 10:26 AM	#16
ETS Michael Major 76 Rep 1,155 Posts Drives: 335i Join Date: May 2009 Location: Vancouver, WA iTrader: (4)	They swapped the injectors and plugs and my idle is perfect and mis fire is gone. Michael
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08-13-2010, 10:14 PM	#17
chancejat First Lieutenant 17 Rep 310 Posts Drives: bmw Join Date: Mar 2010 Location: usa iTrader: (2)	its back................
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08-16-2010, 12:06 PM	#18
ETS Michael Major 76 Rep 1,155 Posts Drives: 335i Join Date: May 2009 Location: Vancouver, WA iTrader: (4)	Bummer.. Mine seems to be ok right now. They had a software update for misfires. It was released end of last month.
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08-16-2010, 12:14 PM	#20
cn555ic 442 Rep 18,331 Posts Drives: 335i Join Date: Jun 2007 Location: US iTrader: (6)	First engine????
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08-19-2010, 07:27 PM	#21
chancejat First Lieutenant 17 Rep 310 Posts Drives: bmw Join Date: Mar 2010 Location: usa iTrader: (2)	the first engine had some kind of cam issue and was bucking like crazy, then one day after i picked it up, i accelerated to test it and it threw a rod. today i noticed that my misfire is only at lower rpms 2500-3500 with a high load. like if im doing 40 or 50mph and put it in 5th gear and accell all the way b4 the clicker it will misfire. but at WOT and high rpms its fine. i got a cylinder 6 misfire twice today...:-(
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08-19-2010, 08:51 PM	#22
chancejat First Lieutenant 17 Rep 310 Posts Drives: bmw Join Date: Mar 2010 Location: usa iTrader: (2)	coils??
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