IHADAV8.com - Turbo Buick Tech, and Nonsense

Tech Area => General Buick Tech => Topic started by: Scoobum on April 20 2013, 07:30:43 PM

Title: Low 02 Reading
Post by: Scoobum on April 20 2013, 07:30:43 PM

I'm getting a low 02 WOT reading from Dan Kellers car...and it isn't real. 02's are in the mid 600's. No KR. New fuel pump. New hotwire kit. New battery. New alternator. TT chip burned for the exact combination. Fuel pressure rising with boost. 43 line off FP. Tried 2 known good ECM's. Grounds cleaned to within an inch of their lives. New 02 sensor. All SM readings normal. Engine temperature at 170 degrees.
 
Fire away guys...cuz I'm out of ideas.

Title: Re: Low 02 Reading
Post by: Steve Wood on April 20 2013, 08:29:18 PM

I have no idea...but, you might go thru the trouble tree here http://www.vortexbuicks-etc.com/code_13.htm (http://www.vortexbuicks-etc.com/code_13.htm) to check the continuity, etc.

Does the car go into closed loop?

What are the blms showing?

Title: Re: Low 02 Reading
Post by: Scoobum on April 20 2013, 09:12:37 PM

I'll be at Dans tomorrow...and check BLM's and closed loop.

Title: Re: Low 02 Reading
Post by: daveismissing on April 21 2013, 10:33:44 AM

Are you sure the knock sensor works?

Title: Re: Low 02 Reading
Post by: motorhead on April 21 2013, 06:36:08 PM

What brand(s) of O2?

Title: Re: Low 02 Reading
Post by: gusszgs on April 24 2013, 12:54:53 PM

Stock MAF?

Title: Re: Low 02 Reading
Post by: Scoobum on April 24 2013, 04:33:42 PM

Stock MAF
BLM's-118
Goes into closed loop
Knock Sensor is working
Denso 02 sensor

Title: Re: Low 02 Reading
Post by: Steve Wood on April 24 2013, 07:17:21 PM

so, assuming the maf is reading at least 245 at wot, the ecm is pulling fuel while the O2 sensor is telling it to add fuel?

Title: Re: Low 02 Reading
Post by: Scoobum on April 24 2013, 07:41:26 PM

Quote from: Steve Wood on April 24 2013, 07:17:21 PM

so, assuming the maf is reading at least 245 at wot, the ecm is pulling fuel while the O2 sensor is telling it to add fuel?

Steve...the BLM reading is at idle warmed up. The owner has a PL file at WOT for an entire run. Let me know what readings you want at WOT.

Title: Re: Low 02 Reading
Post by: Steve Wood on April 24 2013, 09:58:57 PM

be easier to post the file then we can look at it

Title: Re: Low 02 Reading
Post by: motorhead on April 25 2013, 04:25:36 PM

Heated O2 or stock replacement? Cross counts?