Engine Light on, loosing power

vendetta233 · 03-27-2011, 12:29 PM

My engine light keep coming on and off. When the light is off car run smooth no cold starts. But when the light comes on the car looses acceleration and when i try to turn the car on, it doesnt start on the first tried, it will start on the 2nd try. Any ideas what this could be.... The car runs perfectly fine until the engine light come on, i mean it runs well it just doesnt accelerate fast like it normally does. it will gradually gain speed, but when the light is off the car accelerate at fast pace. I dont know what more details to give..thats all i know

Drizzles · 03-27-2011, 01:05 PM

really REALLY gonna need more details than that

Eliott's-BMW · 03-27-2011, 01:59 PM

Go get the codes from the ECU, Autozone will do it free

Pimpwerx · 03-27-2011, 05:16 PM

I'm interested to know what your problem ends up being. I have something similar that gives me o2 sensor adaptation and control limit errors on both banks. I'm pretty sure both o2 sensors aren't bad, so the problem must be on the intake side.

I don't know if it's too much air or fuel, but I assume it's too much air since there's a control limit code. I changed the intake boots, MAF and have a throttle body gasket to put on. The CEL went from constant to intermittent when I upgraded to the performance intake recently. That increases airflow, so I don't know anymore if the issue is an air leak. But I'm still operating under that assumption. PEACE.

jdstrickland · 03-27-2011, 05:34 PM

Quote:

Originally Posted by vendetta233

My engine light keep coming on and off. When the light is off car run smooth no cold starts. But when the light comes on the car looses acceleration and when i try to turn the car on, it doesnt start on the first tried, it will start on the 2nd try. Any ideas what this could be.... The car runs perfectly fine until the engine light come on, i mean it runs well it just doesnt accelerate fast like it normally does. it will gradually gain speed, but when the light is off the car accelerate at fast pace. I dont know what more details to give..thats all i know

There are hundreds of things that can make the light turn on, and the car run poorly. Have you given any thought to pulling codes to see what makes the light come on?

kosnosferatu · 03-27-2011, 05:40 PM

Quote:

Originally Posted by Eliott's-BMW

Go get the codes from the ECU, Autozone will do it free

This. Pointless to discuss until you know the codes.

03-27-2011, 12:29 PM	#1
vendetta233 Registered User Join Date: Apr 2009 Location: fort campbell Ky/ NJ/ Afghanistan Posts: 25 My Ride: 2001 325 ci View My Garage	Engine Light on, loosing power My engine light keep coming on and off. When the light is off car run smooth no cold starts. But when the light comes on the car looses acceleration and when i try to turn the car on, it doesnt start on the first tried, it will start on the 2nd try. Any ideas what this could be.... The car runs perfectly fine until the engine light come on, i mean it runs well it just doesnt accelerate fast like it normally does. it will gradually gain speed, but when the light is off the car accelerate at fast pace. I dont know what more details to give..thats all i know __________________ "A veteran is someone who, at one point in his life, wrote a blank check made payable to 'The United States of America ' for an amount of.... 'up to and including my life." Last edited by vendetta233; 03-27-2011 at 01:21 PM. Reason: more details

03-27-2011, 01:05 PM	#2
Drizzles Registered User Join Date: Dec 2009 Location: Australia Posts: 952 My Ride: 1999 BMW 318i E46 4D View My Garage	really REALLY gonna need more details than that __________________ My Mods etc >> http://forum.e46fanatics.com/showthr...073&highlight= ...

03-27-2011, 01:59 PM	#3
Eliott's-BMW Registered User Join Date: Oct 2008 Location: TX-DFW Posts: 1,079 My Ride: E46 3-Pedal Mafia View My Garage	Go get the codes from the ECU, Autozone will do it free __________________ Who has the skills? e30 project "May GOD grant you DOUBLE the amount you wish upon me!"

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03-27-2011, 05:16 PM	#4
Pimpwerx Registered User Join Date: Apr 2010 Location: Miami Posts: 140 My Ride: 2002 BMW 325Ci View My Garage	I'm interested to know what your problem ends up being. I have something similar that gives me o2 sensor adaptation and control limit errors on both banks. I'm pretty sure both o2 sensors aren't bad, so the problem must be on the intake side. I don't know if it's too much air or fuel, but I assume it's too much air since there's a control limit code. I changed the intake boots, MAF and have a throttle body gasket to put on. The CEL went from constant to intermittent when I upgraded to the performance intake recently. That increases airflow, so I don't know anymore if the issue is an air leak. But I'm still operating under that assumption. PEACE.