Trouble getting OBD Code
March 3rd, 2014, 11:48 AM
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Trouble getting OBD Code
As the title states, I am having one hell of a time getting the code when my check engine light comes on.
Lets start at the beginning.
1994 K1500 Z71 5.7l 350 Automatic
Before the light started to come on it just idled a little rough, its got a misfire that I'm trying to trace down. The light never came on. it ran perfect except at idle and only after it warmed up. Running cold, it ran great. It wont pass inspection, with only a high HC at idle, everything else was perfect.
The light started to come on about a week back, here's what it does now.
When I jump in my truck and turn it on, it runs fine. Sometimes I can go 50+ miles before the light comes on, but when it does come on, the idle goes to crap and I lose alot of power. I've tried to get the code, but as soon as i turn the truck off, the code goes away. All I get is code 12, system normal. if I start the truck back up, it has no engine light and runs fine, with the mis of course, but when the light comes back on, its the same thing.
Here's what I've done to try and get it to pass inspection:
Catalytic converter - 250K miles, figured even if it didnt fix it, it was probably time
O2 sensor
plugs
wires
coil, cap, and rotor
PCV
oil change
air filter
rebuilt TBI
someone please help, I'm about to strap TNT to the truck and rid myself of the headache
Lets start at the beginning.
1994 K1500 Z71 5.7l 350 Automatic
Before the light started to come on it just idled a little rough, its got a misfire that I'm trying to trace down. The light never came on. it ran perfect except at idle and only after it warmed up. Running cold, it ran great. It wont pass inspection, with only a high HC at idle, everything else was perfect.
The light started to come on about a week back, here's what it does now.
When I jump in my truck and turn it on, it runs fine. Sometimes I can go 50+ miles before the light comes on, but when it does come on, the idle goes to crap and I lose alot of power. I've tried to get the code, but as soon as i turn the truck off, the code goes away. All I get is code 12, system normal. if I start the truck back up, it has no engine light and runs fine, with the mis of course, but when the light comes back on, its the same thing.
Here's what I've done to try and get it to pass inspection:
Catalytic converter - 250K miles, figured even if it didnt fix it, it was probably time
O2 sensor
plugs
wires
coil, cap, and rotor
PCV
oil change
air filter
rebuilt TBI
someone please help, I'm about to strap TNT to the truck and rid myself of the headache
Last edited by Mehthiro; March 3rd, 2014 at 3:58 PM.
May 20th, 2020, 3:14 PM
#2
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Join Date: May 2020
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As the title states, I am having one hell of a time getting the code when my check engine light comes on.
Lets start at the beginning.
1994 K1500 Z71 5.7l 350 Automatic
Before the light started to come on it just idled a little rough, its got a misfire that I'm trying to trace down. The light never came on. it ran perfect except at idle and only after it warmed up. Running cold, it ran great. It wont pass inspection, with only a high HC at idle, everything else was perfect.
The light started to come on about a week back, here's what it does now.
When I jump in my truck and turn it on, it runs fine. Sometimes I can go 50+ miles before the light comes on, but when it does come on, the idle goes to crap and I lose alot of power. I've tried to get the code, but as soon as i turn the truck off, the code goes away. All I get is code 12, system normal. if I start the truck back up, it has no engine light and runs fine, with the mis of course, but when the light comes back on, its the same thing.
Here's what I've done to try and get it to pass inspection:
Catalytic converter - 250K miles, figured even if it didnt fix it, it was probably time
O2 sensor
plugs
wires
coil, cap, and rotor
PCV
oil change
air filter
rebuilt TBI
someone please help, I'm about to strap TNT to the truck and rid myself of the headache
Lets start at the beginning.
1994 K1500 Z71 5.7l 350 Automatic
Before the light started to come on it just idled a little rough, its got a misfire that I'm trying to trace down. The light never came on. it ran perfect except at idle and only after it warmed up. Running cold, it ran great. It wont pass inspection, with only a high HC at idle, everything else was perfect.
The light started to come on about a week back, here's what it does now.
When I jump in my truck and turn it on, it runs fine. Sometimes I can go 50+ miles before the light comes on, but when it does come on, the idle goes to crap and I lose alot of power. I've tried to get the code, but as soon as i turn the truck off, the code goes away. All I get is code 12, system normal. if I start the truck back up, it has no engine light and runs fine, with the mis of course, but when the light comes back on, its the same thing.
Here's what I've done to try and get it to pass inspection:
Catalytic converter - 250K miles, figured even if it didnt fix it, it was probably time
O2 sensor
plugs
wires
coil, cap, and rotor
PCV
oil change
air filter
rebuilt TBI
someone please help, I'm about to strap TNT to the truck and rid myself of the headache
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