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      02-11-2014, 03:38 AM   #1
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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 04:03 PM. Reason: updating
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      02-11-2014, 02:12 PM   #2
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Anyone?
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      02-11-2014, 02:51 PM   #3
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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, 02:54 PM   #4
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We need the specific codes to help you further.
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      02-11-2014, 02:54 PM   #5
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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, 02:56 PM   #6
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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, 03:21 PM   #7
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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, 03:22 PM   #8
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Ok I'll go try that
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      02-12-2014, 03:58 PM   #9
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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, 04:03 PM   #10
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Quote:
Originally Posted by randomhobo View Post
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.

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      02-12-2014, 04:05 PM   #11
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Quote:
Originally Posted by MDORPHN View Post
No. They wouldn't cause it.

Neil
Could there be a boost leak but the system just isnt showing it?
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      02-12-2014, 05:55 PM   #12
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Did they swap the O2 sensors?
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      02-12-2014, 06:01 PM   #13
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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
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      02-12-2014, 06:04 PM   #14
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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, 08:09 PM   #15
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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, 08:35 PM   #16
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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, 06:40 AM   #17
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Any updates?
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      04-27-2014, 11:27 AM   #18
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Quote:
Originally Posted by Dcook0 View Post
Any updates?
Old thread but, the same that happened to OP happened to me. It ended up being a cracked stock charge pipe.
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      04-27-2014, 01:30 PM   #19
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Quote:
Originally Posted by Javy
Quote:
Originally Posted by Dcook0 View Post
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?
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      06-02-2014, 08:46 AM   #20
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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, 03:38 PM   #21
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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!

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      07-07-2014, 04:31 PM   #22
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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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