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06-10-2004, 04:36 AM | #1 |
Registered Member
Join Date: Oct 2003
Posts: 11
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running too rich, why
89 5.0
after i replaced my exhaust with an off road x pipe, i seem to be running way to rich.....gas mileage is way down and my rear bumper is covered in black carbon.....why???? of course with no cats stronger exhaust, but this is straight carbon and an 8 mpg drop...any help is most appreciated |
06-10-2004, 09:12 PM | #2 |
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Join Date: Jun 2003
Location: Wisconsin
Posts: 348
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I'd be willing to bet you accidentally damaged your O2 sensors in the swap. Try pulling codes and post back.
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92 Mustang GT, 347 Stroker(Forged Steel Crank/Rods-Balanced, Forged Aluminum Dished Pistons), Trick Flow Track Heat Intake, Trick Flow Twisted Wedge Heads w/ Stage 3 port/polish, 80mm C&L MAF, FMS 30# Inj., BBK AFPR, Trick Flow Stage 2 Cam, Trick Flow 1.6R Rockers, BBK E.L. Headers, Flowmaster Cat-Back, MAC CAI, FMS Pulleys, Griffin Alum. Radiator, MSD Pro-Billet Distributor; AOD, Dynamic 3300 Lockup Converter, B & M Super Cooler, B&M Ratchet Shifter; 3:73 gears. |
06-11-2004, 04:47 PM | #3 | |
dude5l
Join Date: May 2001
Location: Grande Prairie, Alberta, Canada
Posts: 603
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Quote:
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Good luck! Brad R. 1992 L.X. 5.0 coupe MODS: A few little bolt ons New Best time ...11.60 @ 128 mph @ 2000+ ft altitude. Rice Haters Club member #39 Users rides #2542 |
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06-17-2004, 04:40 PM | #4 |
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Join Date: Oct 2003
Posts: 11
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thanks for the replies, i finally pulled the codes and i got a bunch
with the key in on position i got :67 29 31 95 with the car running i only got one code : 21 can anyone help me with what these codes mean and if they have anything to do with the o2 sensors or why i might be running so rich, thanks the o2 sensors are plugged in i recently had the fuel pump replaced so that might be some of the codes. thanks a lot for the help |
06-18-2004, 08:24 AM | #5 |
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Join Date: Sep 2002
Location: Boston
Posts: 592
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The code 21 is because you ran the test with the engine cold.
The code 29 is telling you the vehicle speed sensor is out of wack. You probably wacked the side of the transmission installing the exhaust. I think the VSS is at the end of the speedo cable. The code 31 is telling you EVP/PFE signal is low(??) The code 67 is saying the neutral saftey switch has failed at some point. You probably nudged it installing the exhaust. and the code 95 is saying your fuelpump circuit is bad. This was from you install. Clear the codes by unplugging the battery for 10 minutes and then drive it around for a day (it will run like crap for 10-20 minutes while the computer relearns the car). Then see what codes you pull. Go here http://www.dalidesign.com/hbook/2digit.html A list of codes and what they mean. Good luck!
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91 GT Carb conversion, holley 600 double pumper, edelbrock performer intake, FMS "C" drop springs, march 1000 underdrive pullies, crane 1.7 roller rockers, GT-40P headers, bassani x pipe, american thunder catback, FMS 4.56's, msd aL6, trunkmount battery, A/C eliminator kit, 3000 stall tci streetfighter, AOD with transgo kit, A+ servo, 300M hardened lockup shaft, kevlar bands and 28,000 gvw trans cooler, 3 core radiator, 300 lbs stripped with a full interior |
06-24-2004, 01:32 AM | #6 |
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Join Date: Oct 2003
Posts: 11
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hey thanks for all the help, and that link
i disconnected the battery for a while then drove it for a while and then pulled the codes again.. key on i got : 67, long pause 1 long pause 31 running all i got was 11 should i just replace the o2 sensors?????? if i replace the o2 sensors and it does not improve things, what should i look into next thanks for your help |
06-24-2004, 07:44 AM | #7 |
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Join Date: Sep 2002
Location: Boston
Posts: 592
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if it says running is 11, then there is no standing condition in the motor, hence you should not be running rich at all. The code's 31 means that the sensor on the back of the EGR drum is bad. I would replace it since it's not that expensive. The code 67 is meaningless since you got the engine started then the neutral saftey circuit shouldnt bother you.
Technically, you should be running a bit leaner if anything from the extra airflow due to lower exhaust backpressure if the EEC could not compensate. I leaned out when I installed my x-pipe.
__________________
91 GT Carb conversion, holley 600 double pumper, edelbrock performer intake, FMS "C" drop springs, march 1000 underdrive pullies, crane 1.7 roller rockers, GT-40P headers, bassani x pipe, american thunder catback, FMS 4.56's, msd aL6, trunkmount battery, A/C eliminator kit, 3000 stall tci streetfighter, AOD with transgo kit, A+ servo, 300M hardened lockup shaft, kevlar bands and 28,000 gvw trans cooler, 3 core radiator, 300 lbs stripped with a full interior |
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