windstar system too lean?

SlowSix · June 11th, 2011, 11:25 PM

I installed a windstar about a month ago. Got my mils in the other day for my longtubes. But my SES light just came back on throwing a system too lean code on both banks. Pretty sure I don't have a vacuum leak. Any ideas?

qwiksilvermustang · June 12th, 2011, 12:17 AM

Can you hear any popping through the intake? Maybe the 02's are bad

and are reading incorrectly.

SlowSix · June 12th, 2011, 12:23 AM

That is what im thinking

SlowSix · June 12th, 2011, 03:08 AM

Sounds like I have a slight exhaust leak on the drivers side, would that cause a system too lean? I would think that would cause a system too rich code?
I'm gonna check for vaccum leaks tomorrow and see if I can figure out where my leak is coming from.

Mr. Red Pony · June 12th, 2011, 04:48 AM

If you have an exhaust leak, it can pull air INTO the exhaust, then the o2s read it thinking it is too lean. Fix the exhaust first.

SlowSix · June 12th, 2011, 11:10 AM

Originally Posted by Mr. Red Pony

If you have an exhaust leak, it can pull air INTO the exhaust, then the o2s read it thinking it is too lean. Fix the exhaust first.

It sounds like its coming from my driver's side longtube. Should I pull it off and retighten it or what?

Mr. Red Pony · June 12th, 2011, 02:28 PM

Did you re-torque the bolts after a few drive cycles? With new headers you want to run it to op-temp, let it cool, and do this about 3-4 times, then re-torque the bolts.

SlowSix · June 12th, 2011, 03:52 PM

I found a pretty large vac leak coming from where the spacer on the windstar mounts up to the manifold. Should fix it. Also retorqued my headers. Making a gasket now hopefully should fix my problem.

June 11th, 2011, 11:25 PM	#1
SlowSix Formerly 01silversixer 2001 V6 15.47@89.57 Join Date: May 2010 Location: Pittsburgh, PA Posts: 3,471 iTrader: 1 reviews	windstar system too lean? I installed a windstar about a month ago. Got my mils in the other day for my longtubes. But my SES light just came back on throwing a system too lean code on both banks. Pretty sure I don't have a vacuum leak. Any ideas? __________________ Build Thread Last edited by SlowSix; June 12th, 2011 at 03:07 AM.

June 12th, 2011, 12:17 AM	#2
qwiksilvermustang Enthusiast 1999 Mustang Pony Not even currently moving Join Date: Mar 2010 Location: Ft. Bragg Posts: 631 iTrader: 2 reviews	Can you hear any popping through the intake? Maybe the 02's are bad and are reading incorrectly. __________________ lt's,o/r h, flow 40's, egr delete,windstar w/65mm tb,UDP, sniper tuned Need to install: 4.2 crank,.030 silvo's,268hr112 cam,RR's,comp 915's

June 12th, 2011, 12:23 AM	#3
SlowSix Formerly 01silversixer 2001 V6 15.47@89.57 Join Date: May 2010 Location: Pittsburgh, PA Posts: 3,471 iTrader: 1 reviews	That is what im thinking __________________ Build Thread

June 12th, 2011, 03:08 AM	#4
SlowSix Formerly 01silversixer 2001 V6 15.47@89.57 Join Date: May 2010 Location: Pittsburgh, PA Posts: 3,471 iTrader: 1 reviews	Sounds like I have a slight exhaust leak on the drivers side, would that cause a system too lean? I would think that would cause a system too rich code? I'm gonna check for vaccum leaks tomorrow and see if I can figure out where my leak is coming from. __________________ Build Thread

June 12th, 2011, 04:48 AM	#5
Mr. Red Pony Resident badass 01 Built V6 (3.9) 13.91 @ 99.1 N/A Join Date: Jan 2010 Location: Lawton, Oklahomo Posts: 6,789 iTrader: 10 reviews	If you have an exhaust leak, it can pull air INTO the exhaust, then the o2s read it thinking it is too lean. Fix the exhaust first. __________________ 271rwhp N/A V6 The Name is Danny. I'm a GM Technician. Suck it.

June 12th, 2011, 02:28 PM	#7
Mr. Red Pony Resident badass 01 Built V6 (3.9) 13.91 @ 99.1 N/A Join Date: Jan 2010 Location: Lawton, Oklahomo Posts: 6,789 iTrader: 10 reviews	Did you re-torque the bolts after a few drive cycles? With new headers you want to run it to op-temp, let it cool, and do this about 3-4 times, then re-torque the bolts. __________________ 271rwhp N/A V6 The Name is Danny. I'm a GM Technician. Suck it.

June 12th, 2011, 03:52 PM	#8
SlowSix Formerly 01silversixer 2001 V6 15.47@89.57 Join Date: May 2010 Location: Pittsburgh, PA Posts: 3,471 iTrader: 1 reviews	I found a pretty large vac leak coming from where the spacer on the windstar mounts up to the manifold. Should fix it. Also retorqued my headers. Making a gasket now hopefully should fix my problem. __________________ Build Thread

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