Need help diagnosing CEL

Craig K. · 01-25-2007, 08:12 PM

Well after I out Tommy's tranmission in the car, I got a CEL, and the car runs like crap.
The CEL will go off with the ignition key cycle, after around 5 minutes of run time the CEL comes on (closed loop?)
The car runs real rough, feels like it's loading up, until I give it enough gas to get past 3K RPM, then it takes off. Feels kinda like a carb car when running really cold.
After it warms up fully, the CEL may turn off, after a while come back on, and may repeat this cycle 10 times or more on my drive to work.

I ran a KOEO test, and tried to read the CEL flashes, but it seemed that they all were 2 or 1 digit codes.
From what I have read, 94/95 should always be 3 digit codes.
Also I may just be reading them wrong.

I was thinking maybe when I had the O2's out (when doing the transmission) that one got damaged and is now not working correctly.

I just want to make sure that I replace the correct part when I fix it.

Any one have a code reader for a 94/95?
Anyone have a code list for 94/95?

Craig K. · 01-26-2007, 03:46 PM

Never mind, I answered my own question today.

I need a left hand O2 sensor, of course I will replace both at the same time.

QWKSNKE · 01-27-2007, 01:53 PM

really surprises me that an 02 sensor problem would make that much of a difference in the running of a car. Sure gas mileage would suffer a bit, but I wouldn't have thought it would cause it to load up

slvrbullit · 01-27-2007, 07:41 PM

Craig, I have a code reader if you need to borrow it anytime.

Blown 5.0 · 01-28-2007, 07:11 AM

Any one have a code reader for a 94/95?
Anyone have a code list for 94/95?[/QUOTE]

I have a Snap-On 2500 updated to 05, a Vantage updated to 02, if i can be of any help to anyone.

67coupe89lx · 01-28-2007, 05:43 PM

Craig,

Your co-worker has finally joined the site.

Any update on the new O2's?

T

Craig K. · 01-29-2007, 08:30 PM

Thanks all,
I will get the O2's in tomorrow night, I will let you all know how it runs after that.

Nice to see you on here finally Todd!

Craig K. · 01-30-2007, 08:47 PM

Well I changed out the LH side O2 (auto zone only had one in stock length) and the car runs great, so far.
I was only able to take it for a short test drive.

01-25-2007, 08:12 PM	#1
Craig K. Nothing new here Join Date: Dec 2004 Location: Senoia, GA Posts: 2,990	Need help diagnosing CEL Well after I out Tommy's tranmission in the car, I got a CEL, and the car runs like crap. The CEL will go off with the ignition key cycle, after around 5 minutes of run time the CEL comes on (closed loop?) The car runs real rough, feels like it's loading up, until I give it enough gas to get past 3K RPM, then it takes off. Feels kinda like a carb car when running really cold. After it warms up fully, the CEL may turn off, after a while come back on, and may repeat this cycle 10 times or more on my drive to work. I ran a KOEO test, and tried to read the CEL flashes, but it seemed that they all were 2 or 1 digit codes. From what I have read, 94/95 should always be 3 digit codes. Also I may just be reading them wrong. I was thinking maybe when I had the O2's out (when doing the transmission) that one got damaged and is now not working correctly. I just want to make sure that I replace the correct part when I fix it. Any one have a code reader for a 94/95? Anyone have a code list for 94/95? __________________ 1974 Triumph TR6 1985 Monte Carlo SS 1986 Mustang GT 2011 KIA Optima GTS

01-26-2007, 03:46 PM	#2
Craig K. Nothing new here Join Date: Dec 2004 Location: Senoia, GA Posts: 2,990	Never mind, I answered my own question today. I need a left hand O2 sensor, of course I will replace both at the same time. __________________ 1974 Triumph TR6 1985 Monte Carlo SS 1986 Mustang GT 2011 KIA Optima GTS

01-27-2007, 07:41 PM	#4
slvrbullit Super Moderator Join Date: Dec 2004 Location: on the water Posts: 1,280	Craig, I have a code reader if you need to borrow it anytime. __________________ 2012 Jeep Wrangler Unlimited--- too many mods to list, about to be sitting on 1 ton axles. 2000 Ford F-350 Dually Lariat LE Crew Cab Short Box 7.3 auto 168,000 miles

01-28-2007, 07:11 AM	#5
Blown 5.0 Senior Member Join Date: Jan 2006 Location: Looking for more ways to add BOOST Posts: 167	Any one have a code reader for a 94/95? Anyone have a code list for 94/95?[/QUOTE] I have a Snap-On 2500 updated to 05, a Vantage updated to 02, if i can be of any help to anyone. __________________ Hauling A** on Pump Gas !!!!!

01-28-2007, 05:43 PM	#6
67coupe89lx Junior Member Join Date: Jan 2007 Location: Huntsville, AL Posts: 1	Craig, Your co-worker has finally joined the site. Any update on the new O2's? T __________________ 89 lx 5.0 5 spd; AFR 165's, Scorpion RR, Tmoss lower, O/R H-pipe, 3 Ch Flow w/ MAC Tails, ASP pulleys, MM subframes, Taurus 3.8 Fan, 3G alt, Kirban AFPR, Hurst Billet Shifter. 67 coupe...too much to mention

01-27-2007, 01:53 PM	#3
QWKSNKE 3v's are slow Join Date: Dec 2004 Location: Here and There Posts: 17,152	really surprises me that an 02 sensor problem would make that much of a difference in the running of a car. Sure gas mileage would suffer a bit, but I wouldn't have thought it would cause it to load up

01-29-2007, 08:30 PM	#7
Craig K. Nothing new here Join Date: Dec 2004 Location: Senoia, GA Posts: 2,990	Thanks all, I will get the O2's in tomorrow night, I will let you all know how it runs after that. Nice to see you on here finally Todd! __________________ 1974 Triumph TR6 1985 Monte Carlo SS 1986 Mustang GT 2011 KIA Optima GTS

01-30-2007, 08:47 PM	#8
Craig K. Nothing new here Join Date: Dec 2004 Location: Senoia, GA Posts: 2,990	Well I changed out the LH side O2 (auto zone only had one in stock length) and the car runs great, so far. I was only able to take it for a short test drive. __________________ 1974 Triumph TR6 1985 Monte Carlo SS 1986 Mustang GT 2011 KIA Optima GTS