My Car Is Running Too Lean, How Do I Fix It?

SPEEDRACERCHICK02'92' · November 17th, 2006, 01:10 PM

MY SEVICE ENGINE SOON LIGHT IS ON AND HAS BEEN ON 4-EVER, I CHECKED THE CODES OUT ON THIS SIGHT AND IT SAYS THAT MY CAR IS TOO LEAN HOW DO I FIX THAT!! I HAVE TO GET THE EMISSIONS DONE QUICK SO I CAN PUT ON MY NEW EHAUST FROM HEADERS BACK!! YEAH!!

!! 40 SERIES TOO!!

mdvaldosta · November 17th, 2006, 09:45 PM

I doubt your car's actually running lean, most likely you have a bad oxygen sensor. What's the code your getting? It'll tell you which 02 sensor is tripping the light. 99% chance it's a bad 02. PS - turn off the caps : )

sweet99 · November 17th, 2006, 11:46 PM

Perhaps you will be lucky and have it be an O2 sensor. Maybe a plugged fuel flter. TPS. Pressure regulator. Good luck and be sure to let us know what the problem when you get it resolved and hopefully soon.
By the way a lean mix is better for inspection than a rich running motor. mark

SPEEDRACERCHICK02'92' · November 19th, 2006, 11:44 AM

THE EMISSIONS STATION INSPECT. GAVE ME THESE CODES: P0136 (O2 SENSOR) , P0156 (O2 AGAIN), P1131, P1150, AND P1151. I LOOKED THEM UP ON THIS SITE AND IT SAID IT WAS TOO LEAN.

sweet99 · November 19th, 2006, 01:47 PM

Originally Posted by SPEEDRACERCHICK02'92'

THE EMISSIONS STATION INSPECT. GAVE ME THESE CODES: P0136 (O2 SENSOR) , P0156 (O2 AGAIN), P1131, P1150, AND P1151. I LOOKED THEM UP ON THIS SITE AND IT SAID IT WAS TOO LEAN.

My Haynes manual does mot have any codes like the last 3 you gave. They all start with a PO and then 3 digits, so that P1131 might be PO131?. All seem to be O2 sensor codes. Can you confirm the last 3 code numbers and where are they on this site, under what heading? Thanks, mark

ChrisJ · November 20th, 2006, 03:37 AM

Change out your 02 sensors...

White2000GT · November 20th, 2006, 05:20 AM

I'm getting the bad O2 sensor codes as well. What sucks is that I bought them brand new along with the extension harnesses. You would think that brand new sensors would work just fine, but obviously mine don't.
Get this. So I found this website where I can type in the part I am looking for and it will send an email to a whole network of junkyards and such looking for the parts. I figure, hey, if I get them off another 2000 model then I am sure they will work. So I get a couple responses. They all want MORE for the used ones than what I paid for the brand new ones! What's up with that?

SPEEDRACERCHICK02'92' · December 2nd, 2006, 12:06 AM

I HAVE'NT MESSED WITH MY CAR LATELY, BEEN TOO BUSY WORKING TO PAY FOR MY ADDICTION TO RACING AND OTHER THINGS!! THANX YOU ALL FOR THE FEEDBACK!! I JUST GOT MOST OF MY EXHAUST FOR IT NOW IM WAITING ON THE H-PIPE. MY HUSBAND GOT IT ALL FOR ME OFF E-BAY FOR REAL CHEAP, I CANT WAIT TO PUT IT ON MY SHITBOX!! HE ALSO GOT ME THE ELIMINATORS TOO, WILL IT PASS EMISSIONS IF I PUT ALL THE EXHAUST ON WITH THE ELIMINATORS? IS LONG TUBE CERAMIC COATED HEADERS, H-PIPE, AND 40 SERIES FLOW MASTERS AND TIPS, ALL 2 1/2 IN. I USED TO WORK @ THE EMISSIONS STATION, BUT NEVER HAD ANYONE COME IN WITH THAT SETUP THATS Y I WAS WONDERING. THANX AGAIN GUYS!! I ALSO HAVE A MYSPACE ACCT. TOO ITS UNDER "MRS.REED" IF I'M NOT ON HERE. BUT IT DOES'NT HAVE MY PICS OF MY 92' SHITBOX ONLY MY 02' .

White2000GT · December 13th, 2006, 04:13 AM

From what I understand, LT's will not pass emmissions testing. Now, whether that is with the sniffer or a visual inspection, I don't know. All the MIL's do is trick the car's computer into thinking there are still catalytic converters installed, so that won't affect the outcome of an emmission's testing in any way.

Pretty Boy · December 14th, 2006, 12:18 AM

Originally Posted by SPEEDRACERCHICK02'92'

THE EMISSIONS STATION INSPECT. GAVE ME THESE CODES: P0136 (O2 SENSOR) , P0156 (O2 AGAIN), P1131, P1150, AND P1151. I LOOKED THEM UP ON THIS SITE AND IT SAID IT WAS TOO LEAN.

P1131 Lack of Upstream Heated Oxygen Sensor Switch - Sensor Indicates Lean - Bank No. 1
P1150 Lack of Upstream Heated Oxygen Sensor Switch - Adaptive Fuel Limit - Bank No. 2
A code P1151 may mean that one or more of the following has happened:
Electrical:

* Short to VPWR in the harness or HO2S
* Water in the harness connector
* Open/shorted HO2S circuit
* Corrosion or poor mating terminals and wiring
* Damaged HO2S
* Damaged PCM

Fuel System:

* Excessive fuel pressure
Leaking/contaminated fuel injectors
Leaking fuel pressure regulator
Low fuel pressure or running out of fuel
Vapor recovery system

Induction System:

* Air leaks after the MAF
* Vacuum Leaks

PCV system:

* Improperly seated engine oil dipstick

EGR System:

* Leaking gasket
* Stuck EGR valve
* Leaking diaphragm or EVR

Base Engine:

* Oil overfill
* Cam Timing
* Cylinder compression
* Exhaust leaks before or near the HO2S(s)

Invictus · December 14th, 2006, 12:54 AM

look my caps lock is off :lala

November 17th, 2006, 01:10 PM	#1
SPEEDRACERCHICK02'92' Newbie Join Date: Nov 2006 Location: ELKTON, MD Posts: 3	My Car Is Running Too Lean, How Do I Fix It? MY SEVICE ENGINE SOON LIGHT IS ON AND HAS BEEN ON 4-EVER, I CHECKED THE CODES OUT ON THIS SIGHT AND IT SAYS THAT MY CAR IS TOO LEAN HOW DO I FIX THAT!! I HAVE TO GET THE EMISSIONS DONE QUICK SO I CAN PUT ON MY NEW EHAUST FROM HEADERS BACK!! YEAH!! !! 40 SERIES TOO!!

November 17th, 2006, 11:46 PM	#3
sweet99 Regular Join Date: Nov 2006 Posts: 201	Perhaps you will be lucky and have it be an O2 sensor. Maybe a plugged fuel flter. TPS. Pressure regulator. Good luck and be sure to let us know what the problem when you get it resolved and hopefully soon. By the way a lean mix is better for inspection than a rich running motor. mark __________________ '99 Convertible. 4.10's, PYPES catted X-pipe and catback. UDP's. 75mmBBK TB/plenum. JLT CAI. UDP's, Brenspeed custom tuned SCT. SVO intake & SHM cams this winter! Lord willing.

November 19th, 2006, 11:44 AM	#4
SPEEDRACERCHICK02'92' Newbie Join Date: Nov 2006 Location: ELKTON, MD Posts: 3	THE EMISSIONS STATION INSPECT. GAVE ME THESE CODES: P0136 (O2 SENSOR) , P0156 (O2 AGAIN), P1131, P1150, AND P1151. I LOOKED THEM UP ON THIS SITE AND IT SAID IT WAS TOO LEAN. __________________ VICKI REED

November 20th, 2006, 03:37 AM	#6
ChrisJ MuchCoolerThanGTsetGO 2002 Mustang GT SLOW Join Date: Jun 2006 Location: Shepherdsville, Kentucky Posts: 16,286	Change out your 02 sensors... __________________ My Junk www.myspace.com/cjobe

November 20th, 2006, 05:20 AM	#7
White2000GT Regular Join Date: Jun 2006 Location: Rota, Spain Posts: 71	I'm getting the bad O2 sensor codes as well. What sucks is that I bought them brand new along with the extension harnesses. You would think that brand new sensors would work just fine, but obviously mine don't. Get this. So I found this website where I can type in the part I am looking for and it will send an email to a whole network of junkyards and such looking for the parts. I figure, hey, if I get them off another 2000 model then I am sure they will work. So I get a couple responses. They all want MORE for the used ones than what I paid for the brand new ones! What's up with that? __________________ 2000 Mustang GT 5 speed BBK LT headers BBK O/R X pipe Magnaflow Magnapack catback UPR CAI

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November 17th, 2006, 09:45 PM	#2
mdvaldosta Maintenance Man 2002 Mustang GT 11.47@120.58 Join Date: Aug 2005 Location: Valdosta, GA Posts: 3,943	I doubt your car's actually running lean, most likely you have a bad oxygen sensor. What's the code your getting? It'll tell you which 02 sensor is tripping the light. 99% chance it's a bad 02. PS - turn off the caps : )

December 2nd, 2006, 12:06 AM	#8
SPEEDRACERCHICK02'92' Newbie Join Date: Nov 2006 Location: ELKTON, MD Posts: 3	I HAVE'NT MESSED WITH MY CAR LATELY, BEEN TOO BUSY WORKING TO PAY FOR MY ADDICTION TO RACING AND OTHER THINGS!! THANX YOU ALL FOR THE FEEDBACK!! I JUST GOT MOST OF MY EXHAUST FOR IT NOW IM WAITING ON THE H-PIPE. MY HUSBAND GOT IT ALL FOR ME OFF E-BAY FOR REAL CHEAP, I CANT WAIT TO PUT IT ON MY SHITBOX!! HE ALSO GOT ME THE ELIMINATORS TOO, WILL IT PASS EMISSIONS IF I PUT ALL THE EXHAUST ON WITH THE ELIMINATORS? IS LONG TUBE CERAMIC COATED HEADERS, H-PIPE, AND 40 SERIES FLOW MASTERS AND TIPS, ALL 2 1/2 IN. I USED TO WORK @ THE EMISSIONS STATION, BUT NEVER HAD ANYONE COME IN WITH THAT SETUP THATS Y I WAS WONDERING. THANX AGAIN GUYS!! I ALSO HAVE A MYSPACE ACCT. TOO ITS UNDER "MRS.REED" IF I'M NOT ON HERE. BUT IT DOES'NT HAVE MY PICS OF MY 92' SHITBOX ONLY MY 02' . __________________ VICKI REED

December 13th, 2006, 04:13 AM	#9
White2000GT Regular Join Date: Jun 2006 Location: Rota, Spain Posts: 71	From what I understand, LT's will not pass emmissions testing. Now, whether that is with the sniffer or a visual inspection, I don't know. All the MIL's do is trick the car's computer into thinking there are still catalytic converters installed, so that won't affect the outcome of an emmission's testing in any way. __________________ 2000 Mustang GT 5 speed BBK LT headers BBK O/R X pipe Magnaflow Magnapack catback UPR CAI

December 14th, 2006, 12:54 AM	#11
Invictus Hardcore Enthusiast 1999 Mustang Join Date: Jul 2006 Posts: 1,311	look my caps lock is off :lala

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