half engine light pass 4k rpm

randomhobo · 02-11-2014, 01:38 AM

When i try to get on it and the car gets pass 4000 rpm the half engine light shows up, but the car drives perfectly fine. When i restart the car the half engine light disappears and doesnt come back unless i go past 4k rpms When i try to read the codes no codes shows up about it except i do have 4 codes from the catless dps. Could that be why?
this is what the obd reader showed
Misfire Monitor-OK
Fuel System Mon-OK
Comp Component-OK
Catalyst Mon-OK
Htd Catalyst-n/a
Evap System Mon-OK
Sec Air system-n/a
A/C Refrig Mon-n/a
Oxygen Sens Mon-OK
Oxygen Sens Htr-ok
EGR/VVT Sys Mon-n/a

P0420-catalyst system efficincy below threshold bank 1 CONFIRMED
P0430-catalyst stem efficiency below threshold bank 2 CONFIRMED
P0420-catalyst system efficincy below threshold bank 1 PENDING
P0430-catalyst system efficincy below threshold bank 1 PENDING

but theres nothing about a misfire or boost leak.

randomhobo · 02-11-2014, 12:12 PM

Anyone?

JStang · 02-11-2014, 12:51 PM

We would be guessing with the information provided. You don't have a way to read codes?

Does it feel like you are hitting full boost?

Jeff@TopGearSolutions · 02-11-2014, 12:54 PM

We need the specific codes to help you further.

randomhobo · 02-11-2014, 12:54 PM

Ill post codes later today. It does feel a littler slower could I throw a code for a boost leak?

randomhobo · 02-11-2014, 12:56 PM

I read the codes the day it happened but I didn't get any codes about misfires or boost leaks just 4 codes for the o2 sensors

JStang · 02-11-2014, 01:21 PM

Boost lead will definitely make it feel slower. When I had one the symptoms were similar to yours. Do a WOT pull and see if you get thrown back into your seat like you normally do.

randomhobo · 02-11-2014, 01:22 PM

Ok I'll go try that

randomhobo · 02-12-2014, 01:58 PM

I just updated with all the codes its showing, but no misfire codes or boost leak codes. Could catless dps give me a half engine light when i step on it?

MDORPHN · 02-12-2014, 02:03 PM

Quote:

Originally Posted by randomhobo

I just updated with all the codes its showing, but no misfire codes or boost leak codes. Could catless dps give me a half engine light when i step on it?

No. They wouldn't cause it.

Neil

randomhobo · 02-12-2014, 02:05 PM

Quote:

Originally Posted by MDORPHN

No. They wouldn't cause it.

Neil

Could there be a boost leak but the system just isnt showing it?

JStang · 02-12-2014, 03:55 PM

Did they swap the O2 sensors?

randomhobo · 02-12-2014, 04:01 PM

Quote:

Originally Posted by JStang

Did they swap the O2 sensors?

I don't think they did. I was about to get new turbos but at the last minute bmw declined it. The dealer did do a horrible job puting my dps back on tho. I had to take it to a exhaust shop to get it readjusted

randomhobo · 02-12-2014, 04:04 PM

If they were swapped shouldnt the car be running like sh*t. It runs perfectly fine just when I get on it I get a half engine light. But no loss in power at all. I did what you told me and it seems I'm building boost just fine. Do y'all think the dps could be causing the half engine light?

B2STYB0Y · 02-12-2014, 06:09 PM

Is your car leaking? Because I have a 07 AT with 73000 miles and had to replace the mechatronic sleeve and did the transmissions fluid as well but after that I am able to past 4k rpm without the half engine light. Where as before I had the same issue even when the car was fully warmed and everything.

randomhobo · 02-12-2014, 06:35 PM

No no leaks at all I've been puting a pice of paper towel under the car ever night to check

Dcook0 · 04-27-2014, 05:40 AM

Any updates?

Javy · 04-27-2014, 10:27 AM

Quote:

Originally Posted by Dcook0

Any updates?

Old thread but, the same that happened to OP happened to me. It ended up being a cracked stock charge pipe.

randomhobo · 04-27-2014, 12:30 PM

Quote:

Originally Posted by Javy

Quote:

Originally Posted by Dcook0

Any updates?

Old thread but, the same that happened to OP happened to me. It ended up being a cracked stock charge pipe.

I still haven't gotten it fixed yet lol. But whenever I try to read the code there is no code. Did the same thing happen to you?

Dcook0 · 06-02-2014, 07:46 AM

The same thing would happen to me, but once i swapped my stock intercooler and torqed down the hose clamps with a drill it went away.

Eloquescence · 06-06-2014, 02:38 PM

Please! Does anyone have a solution for this issue? OP, did you ever get this fixed? I just took my car to Autozone --- they couldn't find any fault codes. I also had my ODB2 (Bluetooth) w/ Torque application and it could find no fault codes either. What should I do? I don't want to have to take my car to the stealership, but I am quickly running out of options.

I am having the EXACT same problem as the OP and others on this thread. Any help would be appreciated!

-Elo

Dcook0 · 07-07-2014, 03:31 PM

I still have this problem.
It seems to happen only once in a while under certain throttle positions in certain gears.

It all started when I installed my JB4 in January of this year.

Im FBO ( NO meth/ stock turbos)
I did get an walbro 450 e85 compatible LPFP and changed the boost control solenoids.
Good thing is my boost oscillation seems to have gone away, but I still got the yellow half engine at aound 4k rpm. (randomly)

Im starting to think it may be a software issue , or my waste gate actuators arent operating like the should, or possibly a small leak in a vacuum hose.

Ive got a new HPFP ill install while I walnut blast the intake. After that the only other thing I could think to do is upgrade to RB turbos...
But thats a big investment.

If I find anything Ill post more.

02-11-2014, 01:38 AM	#1
randomhobo Private 3 Rep 65 Posts Drives: m5 Join Date: Apr 2012 Location: ms iTrader: (2)	half engine light pass 4k rpm When i try to get on it and the car gets pass 4000 rpm the half engine light shows up, but the car drives perfectly fine. When i restart the car the half engine light disappears and doesnt come back unless i go past 4k rpms When i try to read the codes no codes shows up about it except i do have 4 codes from the catless dps. Could that be why? this is what the obd reader showed Misfire Monitor-OK Fuel System Mon-OK Comp Component-OK Catalyst Mon-OK Htd Catalyst-n/a Evap System Mon-OK Sec Air system-n/a A/C Refrig Mon-n/a Oxygen Sens Mon-OK Oxygen Sens Htr-ok EGR/VVT Sys Mon-n/a P0420-catalyst system efficincy below threshold bank 1 CONFIRMED P0430-catalyst stem efficiency below threshold bank 2 CONFIRMED P0420-catalyst system efficincy below threshold bank 1 PENDING P0430-catalyst system efficincy below threshold bank 1 PENDING but theres nothing about a misfire or boost leak. Last edited by randomhobo; 02-12-2014 at 02:03 PM.. Reason: updating
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02-11-2014, 12:12 PM	#2
randomhobo Private 3 Rep 65 Posts Drives: m5 Join Date: Apr 2012 Location: ms iTrader: (2)	Anyone?
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02-11-2014, 12:51 PM	#3
JStang Brigadier General 562 Rep 3,625 Posts Drives: FDB M3 CS Join Date: Dec 2010 Location: St. Petersburg, FL iTrader: (9)	We would be guessing with the information provided. You don't have a way to read codes? Does it feel like you are hitting full boost?
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02-11-2014, 12:54 PM	#4
Jeff@TopGearSolutions 3441 Rep 79,211 Posts Drives: C6 Z06, 09 335i, 10 335xi Join Date: Dec 2008 Location: www.TopGearSolutions.com iTrader: (37)	We need the specific codes to help you further.
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02-11-2014, 12:54 PM	#5
randomhobo Private 3 Rep 65 Posts Drives: m5 Join Date: Apr 2012 Location: ms iTrader: (2)	Ill post codes later today. It does feel a littler slower could I throw a code for a boost leak?
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02-11-2014, 12:56 PM	#6
randomhobo Private 3 Rep 65 Posts Drives: m5 Join Date: Apr 2012 Location: ms iTrader: (2)	I read the codes the day it happened but I didn't get any codes about misfires or boost leaks just 4 codes for the o2 sensors
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02-11-2014, 01:21 PM	#7
JStang Brigadier General 562 Rep 3,625 Posts Drives: FDB M3 CS Join Date: Dec 2010 Location: St. Petersburg, FL iTrader: (9)	Boost lead will definitely make it feel slower. When I had one the symptoms were similar to yours. Do a WOT pull and see if you get thrown back into your seat like you normally do.
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02-11-2014, 01:22 PM	#8
randomhobo Private 3 Rep 65 Posts Drives: m5 Join Date: Apr 2012 Location: ms iTrader: (2)	Ok I'll go try that
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02-12-2014, 01:58 PM	#9
randomhobo Private 3 Rep 65 Posts Drives: m5 Join Date: Apr 2012 Location: ms iTrader: (2)	I just updated with all the codes its showing, but no misfire codes or boost leak codes. Could catless dps give me a half engine light when i step on it?
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02-12-2014, 03:55 PM	#12
JStang Brigadier General 562 Rep 3,625 Posts Drives: FDB M3 CS Join Date: Dec 2010 Location: St. Petersburg, FL iTrader: (9)	Did they swap the O2 sensors?
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02-12-2014, 04:04 PM	#14
randomhobo Private 3 Rep 65 Posts Drives: m5 Join Date: Apr 2012 Location: ms iTrader: (2)	If they were swapped shouldnt the car be running like sh*t. It runs perfectly fine just when I get on it I get a half engine light. But no loss in power at all. I did what you told me and it seems I'm building boost just fine. Do y'all think the dps could be causing the half engine light?
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02-12-2014, 06:09 PM	#15
B2STYB0Y Enlisted Member 0 Rep 36 Posts Drives: 2007 335i Join Date: Jun 2013 Location: SoCal iTrader: (0)	Is your car leaking? Because I have a 07 AT with 73000 miles and had to replace the mechatronic sleeve and did the transmissions fluid as well but after that I am able to past 4k rpm without the half engine light. Where as before I had the same issue even when the car was fully warmed and everything.
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02-12-2014, 06:35 PM	#16
randomhobo Private 3 Rep 65 Posts Drives: m5 Join Date: Apr 2012 Location: ms iTrader: (2)	No no leaks at all I've been puting a pice of paper towel under the car ever night to check
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04-27-2014, 05:40 AM	#17
Dcook0 New Member 0 Rep 23 Posts Drives: 2007 335xi Sport Package Join Date: Oct 2013 Location: APO AE iTrader: (0)	Any updates?
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06-02-2014, 07:46 AM	#20
Dcook0 New Member 0 Rep 23 Posts Drives: 2007 335xi Sport Package Join Date: Oct 2013 Location: APO AE iTrader: (0)	The same thing would happen to me, but once i swapped my stock intercooler and torqed down the hose clamps with a drill it went away.
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06-06-2014, 02:38 PM	#21
Eloquescence New Member 0 Rep 26 Posts Drives: 2007 BMW 335i Join Date: Jun 2014 Location: Baltimore, MD iTrader: (0)	Please! Does anyone have a solution for this issue? OP, did you ever get this fixed? I just took my car to Autozone --- they couldn't find any fault codes. I also had my ODB2 (Bluetooth) w/ Torque application and it could find no fault codes either. What should I do? I don't want to have to take my car to the stealership, but I am quickly running out of options. I am having the EXACT same problem as the OP and others on this thread. Any help would be appreciated! -Elo
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07-07-2014, 03:31 PM	#22
Dcook0 New Member 0 Rep 23 Posts Drives: 2007 335xi Sport Package Join Date: Oct 2013 Location: APO AE iTrader: (0)	I still have this problem. It seems to happen only once in a while under certain throttle positions in certain gears. It all started when I installed my JB4 in January of this year. Im FBO ( NO meth/ stock turbos) I did get an walbro 450 e85 compatible LPFP and changed the boost control solenoids. Good thing is my boost oscillation seems to have gone away, but I still got the yellow half engine at aound 4k rpm. (randomly) Im starting to think it may be a software issue , or my waste gate actuators arent operating like the should, or possibly a small leak in a vacuum hose. Ive got a new HPFP ill install while I walnut blast the intake. After that the only other thing I could think to do is upgrade to RB turbos... But thats a big investment. If I find anything Ill post more.
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