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03-25-2011, 09:57 PM | #1 |
Scooby Specialist
Member#: 257434
Join Date: Sep 2010
Chapter/Region:
NESIC
Location: Central MA
Vehicle:2011 BMW 328xi LeMans Blue |
New motor wont run?
I just recently finished assembling and installing my built Ej205. Now that the motor is in and everything is buttoned up I can only get the motor to start and the initial combustion completed. It will run at idle from 1k to 2k rpms fluctuating for a bit and then stall out or idle extremely low and rough at like 500rpm then stall.
There is only one CEL on for the front 02 sensor which i have on order but didn't think it would have an effect on the motor starting and running. The car is on a stock map that was flashed on by the cobb AP when it was unmarried and has aftermarket exhaust, sti top mount. Anyone have any insight on what i should do/look into to make this thing run correctly past the initial combustion?
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03-25-2011, 10:17 PM | #2 | |
Scooby Specialist
Member#: 259948
Join Date: Oct 2010
Chapter/Region:
W. Canada
Location: Regina, Canada
Vehicle:MPS 510 whp GTX35R Long Rod Motor |
Quote:
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03-26-2011, 12:07 AM | #3 |
Scooby Specialist
Member#: 84105
Join Date: Mar 2005
Chapter/Region:
SCIC
Location: I'm a Newbie
Vehicle:2005 Super Slow STi CGM |
You would be surprised how bad a car can run with a bad front o2 sensor. I highly suggest you avoid running the car until you replace it. You will wash out your cylinders.
Cliff notes: Bad front o2 means your car runs and idles at 10:1 afr's. BAD BAD for a new motor. |
03-26-2011, 04:50 AM | #4 |
Scooby Newbie
Member#: 217112
Join Date: Jul 2009
Chapter/Region:
AKIC
Location: Fairbanks Alaska
Vehicle:1998 GC8 modified black and orange |
Really!?
Well as can solve this real fast. (unplug the sensor) how does it run, if the sensor is bad it will run alot better. If the sensor is ok it most Likely won't make a difference.. Hook up a scan tool and watch the 02 swing. It should show a nice pattern if not try added propain or map gas to see if the sensor responds if it does I bet it's ok. (also noting) if a vehicle is in open loop it won't care what that 02 says. And once it sets the light it's already in dummy mode) I would check your mass air flow sensor (or map sensor depending on what ur running I deleate all the maf on my cars and stick to map way more reliable) check fuel pressure too |
03-26-2011, 01:45 PM | #5 |
Scooby Specialist
Member#: 257434
Join Date: Sep 2010
Chapter/Region:
NESIC
Location: Central MA
Vehicle:2011 BMW 328xi LeMans Blue |
Im off to get the sensor right now, going to plug it in and see if anything changes.
I also forgot to add last night that it seems like im not getting any response to stepping on the gas, when it's idling if i step on the gas then it doesn't seem to rev up, if anything maybe its making it stall?? |
03-29-2011, 04:19 PM | #6 |
Scooby Specialist
Member#: 115070
Join Date: May 2006
Chapter/Region:
MAIC
Location: Northern VA
Vehicle:2009 DGM LGT Spec.B 08 Audi Q7 4.2 PRM |
Check da timing...
-soobaviator |
03-29-2011, 04:23 PM | #7 | |
Scooby Guru
Member#: 51961
Join Date: Jan 2004
Chapter/Region:
RMIC
Location: Broomfield, CO
Vehicle:2005 STi 2012 WRX |
Quote:
Unplug the front o2 sensor, see if that clears things up. |
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03-29-2011, 05:43 PM | #8 |
Scooby Specialist
Member#: 153880
Join Date: Jul 2007
Chapter/Region:
RMIC
Location: Western Slope, Colorado
Vehicle:03 Evo VIII 2011 STI |
Check for air leaks, timing, and get the front o2 in. Car will run like ass without it.
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03-29-2011, 05:46 PM | #9 |
Scooby Guru
Member#: 51961
Join Date: Jan 2004
Chapter/Region:
RMIC
Location: Broomfield, CO
Vehicle:2005 STi 2012 WRX |
No it won't, not unless your MAF or injector scaling are screwed. It will run bad with a malfunctioning o2, but it will run fine without any o2 as long as your MAF/injector scalings are reasonably close.
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03-29-2011, 10:51 PM | #10 |
Scooby Specialist
Member#: 188171
Join Date: Aug 2008
Chapter/Region:
TXIC
Location: bryan/college station
Vehicle:04 sti baby wrb |
its the red shop rag left in the intake.
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