Problem: Rough Idle + other error codes
07-17-2006, 12:35 PM
#1
6th Gear Member
Thread Starter
Join Date: Jun 2006
Location: Maine
Posts: 5,693
Problem: Rough Idle + other error codes
I've been lurking awhile and just recently decided to sign up and post a message.
I have a 95 GT with just over 79,000 miles on it. Nothing too major for mods (underdrive pulleys, off road pipes w/ flowmaster 40, ram air.) I've been running into a problem recently.
First, it seems to idle rough and feels a little rough at low RPMs. The CEL also seems to go off and on. I am going to replace the plugs, wires, cap, rotor because they are due anyway, but I think the problem may be elsewhere.
For error codes, I've been getting the following:
176 (lean condition in bank #2)
543 (fuel pump circuit open)
I am running test pipes with no cats. Just goes straight to flowmaster 40s. I was wondering if that would cause the lean condition codes. I pulled both O2 sensors and they appear to be relatively clean. But I don't know if that would cause the fuel pump error code as well. The fuel pump seems to be working, or at least i can hear it and it sounds like it's working. But I don't know what else would cause this issue. Is this a known condition or should I replace the fuel pump too? I was also going to toss on some MIL eliminators onto the O2 sensors but I don't wanna waste the money if that isn't the problem.
Any ideas?
Thanks in advance for the help.
I have a 95 GT with just over 79,000 miles on it. Nothing too major for mods (underdrive pulleys, off road pipes w/ flowmaster 40, ram air.) I've been running into a problem recently.
First, it seems to idle rough and feels a little rough at low RPMs. The CEL also seems to go off and on. I am going to replace the plugs, wires, cap, rotor because they are due anyway, but I think the problem may be elsewhere.
For error codes, I've been getting the following:
176 (lean condition in bank #2)
543 (fuel pump circuit open)
I am running test pipes with no cats. Just goes straight to flowmaster 40s. I was wondering if that would cause the lean condition codes. I pulled both O2 sensors and they appear to be relatively clean. But I don't know if that would cause the fuel pump error code as well. The fuel pump seems to be working, or at least i can hear it and it sounds like it's working. But I don't know what else would cause this issue. Is this a known condition or should I replace the fuel pump too? I was also going to toss on some MIL eliminators onto the O2 sensors but I don't wanna waste the money if that isn't the problem.
Any ideas?
Thanks in advance for the help.
07-17-2006, 03:44 PM
#3
5th Gear Member
Join Date: Jan 2006
Location: Puerto Rico
Posts: 3,926
RE: Problem: Rough Idle + other error codes
ORIGINAL: samseed101
I've been lurking awhile and just recently decided to sign up and post a message.
I have a 95 GT with just over 79,000 miles on it. Nothing too major for mods (underdrive pulleys, off road pipes w/ flowmaster 40, ram air.) I've been running into a problem recently.
First, it seems to idle rough and feels a little rough at low RPMs. The CEL also seems to go off and on. I am going to replace the plugs, wires, cap, rotor because they are due anyway, but I think the problem may be elsewhere.
For error codes, I've been getting the following:
176 (lean condition in bank #2)
543 (fuel pump circuit open)
I am running test pipes with no cats. Just goes straight to flowmaster 40s. I was wondering if that would cause the lean condition codes. I pulled both O2 sensors and they appear to be relatively clean. But I don't know if that would cause the fuel pump error code as well. The fuel pump seems to be working, or at least i can hear it and it sounds like it's working. But I don't know what else would cause this issue. Is this a known condition or should I replace the fuel pump too? I was also going to toss on some MIL eliminators onto the O2 sensors but I don't wanna waste the money if that isn't the problem.
Any ideas?
Thanks in advance for the help.
I've been lurking awhile and just recently decided to sign up and post a message.
I have a 95 GT with just over 79,000 miles on it. Nothing too major for mods (underdrive pulleys, off road pipes w/ flowmaster 40, ram air.) I've been running into a problem recently.
First, it seems to idle rough and feels a little rough at low RPMs. The CEL also seems to go off and on. I am going to replace the plugs, wires, cap, rotor because they are due anyway, but I think the problem may be elsewhere.
For error codes, I've been getting the following:
176 (lean condition in bank #2)
543 (fuel pump circuit open)
I am running test pipes with no cats. Just goes straight to flowmaster 40s. I was wondering if that would cause the lean condition codes. I pulled both O2 sensors and they appear to be relatively clean. But I don't know if that would cause the fuel pump error code as well. The fuel pump seems to be working, or at least i can hear it and it sounds like it's working. But I don't know what else would cause this issue. Is this a known condition or should I replace the fuel pump too? I was also going to toss on some MIL eliminators onto the O2 sensors but I don't wanna waste the money if that isn't the problem.
Any ideas?
Thanks in advance for the help.
For code 176, and since it's a one side only failure, that side O2 might be due for a replacement (I would replace both)....if you want to confirm it, start engine and make usre it's up to op temp (>180°F), raise rpms in neutral to 2000 rpm and hold for 2-min., shut down engine and run a DIY KOER self-test within 10-seconds of turning engine off, and check if code 176 shows up....if it does do the following O2 sensor tests....
BTW....the MIL eliminators only work for OBD-II systems, they have another pair of O2 sensors after the cat-cons, not applicable to '95 5.0L OBD-I (EEC-IV) systems.
07-17-2006, 04:38 PM
#4
6th Gear Member
Thread Starter
Join Date: Jun 2006
Location: Maine
Posts: 5,693
RE: Problem: Rough Idle + other error codes
Thanks for the input and help.
I forgot about the OBD-II part. That didn't come into play until the following year. I should have thought of that, knowing that there were only 2 O2 sensors
Thanks again
I forgot about the OBD-II part. That didn't come into play until the following year. I should have thought of that, knowing that there were only 2 O2 sensors
Thanks again
06-27-2007, 06:11 PM
#5
6th Gear Member
Thread Starter
Join Date: Jun 2006
Location: Maine
Posts: 5,693
RE: Problem: Rough Idle + other error codes
ORIGINAL: samseed101
I've been lurking awhile and just recently decided to sign up and post a message.
I have a 95 GT with just over 79,000 miles on it. Nothing too major for mods (underdrive pulleys, off road pipes w/ flowmaster 40, ram air.) I've been running into a problem recently.
First, it seems to idle rough and feels a little rough at low RPMs. The CEL also seems to go off and on. I am going to replace the plugs, wires, cap, rotor because they are due anyway, but I think the problem may be elsewhere.
For error codes, I've been getting the following:
176 (lean condition in bank #2)
543 (fuel pump circuit open)
I am running test pipes with no cats. Just goes straight to flowmaster 40s. I was wondering if that would cause the lean condition codes. I pulled both O2 sensors and they appear to be relatively clean. But I don't know if that would cause the fuel pump error code as well. The fuel pump seems to be working, or at least i can hear it and it sounds like it's working. But I don't know what else would cause this issue. Is this a known condition or should I replace the fuel pump too? I was also going to toss on some MIL eliminators onto the O2 sensors but I don't wanna waste the money if that isn't the problem.
Any ideas?
Thanks in advance for the help.
I've been lurking awhile and just recently decided to sign up and post a message.
I have a 95 GT with just over 79,000 miles on it. Nothing too major for mods (underdrive pulleys, off road pipes w/ flowmaster 40, ram air.) I've been running into a problem recently.
First, it seems to idle rough and feels a little rough at low RPMs. The CEL also seems to go off and on. I am going to replace the plugs, wires, cap, rotor because they are due anyway, but I think the problem may be elsewhere.
For error codes, I've been getting the following:
176 (lean condition in bank #2)
543 (fuel pump circuit open)
I am running test pipes with no cats. Just goes straight to flowmaster 40s. I was wondering if that would cause the lean condition codes. I pulled both O2 sensors and they appear to be relatively clean. But I don't know if that would cause the fuel pump error code as well. The fuel pump seems to be working, or at least i can hear it and it sounds like it's working. But I don't know what else would cause this issue. Is this a known condition or should I replace the fuel pump too? I was also going to toss on some MIL eliminators onto the O2 sensors but I don't wanna waste the money if that isn't the problem.
Any ideas?
Thanks in advance for the help.
Since then, I've ditched the ram air and the underdrive pulley kit. I then added 3.73 gears, a shift kit, rebuilt the tranny, installed a B&M ratchet shifter, added sprint performance suspension, summit lower control arms, P-1SC supercharger, water-methanol injection, 1" intake spacer, 76mm blow through MAF, Nitrous wet kit, nitrous switch panel (hidden in ashtray,) boost gauge, AFPR, transmission cooler, bolt-in rollbar, Tweecer RT w/ Binary editor and EEC Analyzer, relocated the battery to the trunk, 30# injectors, 255lph fuel pump, removed EGR, and I can't even remember what else. All in less than a year.
Wow... no wonder I'm freaking broke! I need to sell this thing before I dump mor emoney into it. Already looking at a wideband!
BTW, the problem ehre was with the O2 sensors. Replaced them and the CEL went away.
06-27-2007, 06:25 PM
#7
3rd Gear Member
Join Date: Aug 2006
Location:
Posts: 822
RE: Problem: Rough Idle + other error codes
ORIGINAL: samseed101
Just looking back... This was my first post ever on MF. I just realized how much I had done since posting this. I had 79,000 miles then. here I am a year later and I have 83,000, lol.
Since then, I've ditched the ram air and the underdrive pulley kit. I then added 3.73 gears, a shift kit, rebuilt the tranny, installed a B&M ratchet shifter, added sprint performance suspension, summit lower control arms, P-1SC supercharger, water-methanol injection, 1" intake spacer, 76mm blow through MAF, Nitrous wet kit, nitrous switch panel (hidden in ashtray,) boost gauge, AFPR, transmission cooler, bolt-in rollbar, Tweecer RT w/ Binary editor and EEC Analyzer, relocated the battery to the trunk, 30# injectors, 255lph fuel pump, removed EGR, and I can't even remember what else. All in less than a year.
Wow... no wonder I'm freaking broke! I need to sell this thing before I dump mor emoney into it. Already looking at a wideband!
BTW, the problem ehre was with the O2 sensors. Replaced them and the CEL went away.
ORIGINAL: samseed101
I've been lurking awhile and just recently decided to sign up and post a message.
I have a 95 GT with just over 79,000 miles on it. Nothing too major for mods (underdrive pulleys, off road pipes w/ flowmaster 40, ram air.) I've been running into a problem recently.
First, it seems to idle rough and feels a little rough at low RPMs. The CEL also seems to go off and on. I am going to replace the plugs, wires, cap, rotor because they are due anyway, but I think the problem may be elsewhere.
For error codes, I've been getting the following:
176 (lean condition in bank #2)
543 (fuel pump circuit open)
I am running test pipes with no cats. Just goes straight to flowmaster 40s. I was wondering if that would cause the lean condition codes. I pulled both O2 sensors and they appear to be relatively clean. But I don't know if that would cause the fuel pump error code as well. The fuel pump seems to be working, or at least i can hear it and it sounds like it's working. But I don't know what else would cause this issue. Is this a known condition or should I replace the fuel pump too? I was also going to toss on some MIL eliminators onto the O2 sensors but I don't wanna waste the money if that isn't the problem.
Any ideas?
Thanks in advance for the help.
I've been lurking awhile and just recently decided to sign up and post a message.
I have a 95 GT with just over 79,000 miles on it. Nothing too major for mods (underdrive pulleys, off road pipes w/ flowmaster 40, ram air.) I've been running into a problem recently.
First, it seems to idle rough and feels a little rough at low RPMs. The CEL also seems to go off and on. I am going to replace the plugs, wires, cap, rotor because they are due anyway, but I think the problem may be elsewhere.
For error codes, I've been getting the following:
176 (lean condition in bank #2)
543 (fuel pump circuit open)
I am running test pipes with no cats. Just goes straight to flowmaster 40s. I was wondering if that would cause the lean condition codes. I pulled both O2 sensors and they appear to be relatively clean. But I don't know if that would cause the fuel pump error code as well. The fuel pump seems to be working, or at least i can hear it and it sounds like it's working. But I don't know what else would cause this issue. Is this a known condition or should I replace the fuel pump too? I was also going to toss on some MIL eliminators onto the O2 sensors but I don't wanna waste the money if that isn't the problem.
Any ideas?
Thanks in advance for the help.
Since then, I've ditched the ram air and the underdrive pulley kit. I then added 3.73 gears, a shift kit, rebuilt the tranny, installed a B&M ratchet shifter, added sprint performance suspension, summit lower control arms, P-1SC supercharger, water-methanol injection, 1" intake spacer, 76mm blow through MAF, Nitrous wet kit, nitrous switch panel (hidden in ashtray,) boost gauge, AFPR, transmission cooler, bolt-in rollbar, Tweecer RT w/ Binary editor and EEC Analyzer, relocated the battery to the trunk, 30# injectors, 255lph fuel pump, removed EGR, and I can't even remember what else. All in less than a year.
Wow... no wonder I'm freaking broke! I need to sell this thing before I dump mor emoney into it. Already looking at a wideband!
BTW, the problem ehre was with the O2 sensors. Replaced them and the CEL went away.
ps...Dyno tomorrow afternoon
Thread
Thread Starter
Forum
Replies
Last Post
