KOEO Test gave me code 31,41,91 - Ford Mustang Forum
 
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post #1 of 14 (permalink) Old 10-18-2010 Thread Starter
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KOEO Test gave me code 31,41,91

I did the self test because my check engine light would come on the odd time and would piss me off. My gas mileage sucks recently and i had the slight idle problems as well. Car runs fine but i know there is something wrong. I took all the Spark plugs off and they had some white color to them, also they are gapped at 55 i got 8mm wires and msd cap and rotor and stock coil, I then took off the O2 sensors and they were white colorish as well so i know i got a lean air/fuel mixture. I had a hole in my charcoal canister and had replaced that 2 days ago. i checked for apparant vacuum leaks and none could be found. Today i cleaned and made sure i had good connection with the 10hole salt n pepper shakers to possibly fix my code 31 which is low voltage to egr solenoid. Im waiting to buy 2 new O2 sensors to hopefully fix code 41 and 91. HAS ANYONE HAD THESE CODE PROBLEMS AND HOW DID YOU FIX THEM? when i get the new 02 sensors when i put them on i will disconnect the battery for 30 mins to erase memory...Help anyone?

93 5 speed 306/GT40p Heads,GT40 Tubular Intake,Stock Cam/Electric fan/3g 130amp/MAC underdrives/Blue Thunder Short Throw/MAC offroad Xpipe/Flows super 44/Eibach prokit/MMS lower control arms & Bumpsteer kit/Retrofit Projectors 6000k HID/Saleen spoiler
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post #2 of 14 (permalink) Old 10-18-2010
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those are 02 codes but sometimes they can be from a bad fuel regulator. As for 31 replace the EGR solenoid or if you can (emmisions allowing) remove it. May want to wait on the EGR and see if it goes away after you fix the lean cond.
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post #3 of 14 (permalink) Old 10-18-2010 Thread Starter
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how can i tell if the fuel pressure regulator is bad or not giving good pressure? the one i got is factory, and what should the pressure be at?

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post #4 of 14 (permalink) Old 10-18-2010
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with both 02 codes and a factory reg i say change it sometimes you can smell gas in the vaccum hose.
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post #5 of 14 (permalink) Old 10-18-2010 Thread Starter
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which vacuum hose you talking about? how much are fuel pressure regulators?? can i test it somehow without knowing it good or bad? i guess this is where an adjustable fuel pressure regulator is good to have

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post #6 of 14 (permalink) Old 10-18-2010
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Yeah I would get a BBK or holley. The vacuum line running from the factory reg. You are lean on both banks, either both your 02 are bad or your reg is causing the problem (i.e. a chunk of the diaphram has lodged in the fuel line opening.
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post #7 of 14 (permalink) Old 10-18-2010 Thread Starter
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have you had that experience in the past? well first i will buy the o2 sensors and test them and run the codes again and see if anything comes up. thanks for your help

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post #8 of 14 (permalink) Old 10-18-2010
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Run the 02's and check plugs again LOL This is not my first rodeo
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post #9 of 14 (permalink) Old 10-20-2010 Thread Starter
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Ok well my g/f bought me NTK O2 sensors because Canadian Tire only sells those and they said they dont sell the bosch ones anymore. So the new O2 sensors cleared codes 41 and 91. But i only got code 31 left that wont go away. So i plan on getting a different sensor for the EGR and see if that will go away. Since i got the new O2 Sensors, my car has its power back, it pulls alot better in 2nd gear! and the exhaust sounds more snappy..

93 5 speed 306/GT40p Heads,GT40 Tubular Intake,Stock Cam/Electric fan/3g 130amp/MAC underdrives/Blue Thunder Short Throw/MAC offroad Xpipe/Flows super 44/Eibach prokit/MMS lower control arms & Bumpsteer kit/Retrofit Projectors 6000k HID/Saleen spoiler
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post #10 of 14 (permalink) Old 11-08-2010 Thread Starter
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so i finally fixed code 31. i took the EGR solenoid off and took it apart and cleaned the filter and put a bit of dielectric grease on some electrical contacts and adjusted the long bolt screw that goes in the middle of the solenoid and erased the computer codes, drove my car for about 30 minutes at different speeds and did the KOEO test 2 times and all im getting is code 11 system pass. what i did knotice when i did clean and adjust the EGR solenoid is that when i first start my car my idle sits very still at 750/800rpm's, before there was a little jump maybe like a 50rpm jump in revs when the code 31 was around at first start up and now i realize that the EGR solenoid was doing that problem and also causing a lean condition from what i read and experienced. One last thing tho. my car tends to run a bit warmer? im not sure why? bad thermostat i was thinking? or can the EGR system cause that? i just dont know. what i do know is that its running like a dream.

93 5 speed 306/GT40p Heads,GT40 Tubular Intake,Stock Cam/Electric fan/3g 130amp/MAC underdrives/Blue Thunder Short Throw/MAC offroad Xpipe/Flows super 44/Eibach prokit/MMS lower control arms & Bumpsteer kit/Retrofit Projectors 6000k HID/Saleen spoiler
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Factory gauge is useless. Only way to tell is to use a mechanical gauge or a laser temp reader to see if you are operating in the range of the t-stat being used.

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post #12 of 14 (permalink) Old 11-08-2010 Thread Starter
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ok thank you, ill do that. i actually want to go buy the aftermarket high flow thermostat(balance thermostat) 180 degree, im not sure whats in there right now. i calculated 180-192ish from the factory gauge. but i will do what you suggested.

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post #13 of 14 (permalink) Old 11-09-2010 Thread Starter
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ok, so i changed the EGR solenoid like i said earlier, but now my friggen check engine light will come on again and off and on yada yada. pulled code 31 again! my car runs really good, but what else can i do to fix this code 31? should i buy a new EGR Sensor? oh and there is 1v on the green wire at the EGR solenoid from a DVM test i did. Would bad TAD and TAB solenoids cause a code 31?

93 5 speed 306/GT40p Heads,GT40 Tubular Intake,Stock Cam/Electric fan/3g 130amp/MAC underdrives/Blue Thunder Short Throw/MAC offroad Xpipe/Flows super 44/Eibach prokit/MMS lower control arms & Bumpsteer kit/Retrofit Projectors 6000k HID/Saleen spoiler
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just had the same codes ,buy a new egr solenoid that will clear the 31 code

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