its not an expensive part, if you plan to keep the k5 for while I would change it anyways.
CK5
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Need Help, failed emissions! 1991 k5
- Thread starter Messenjah
- Start date
It was $60 from what I found, which is expensive for me... I wanna keep my rig forever for sure. I am trying to hold off on things as much as possible until I grad school and get a better job. I make crap right now. You're probably right though, I would rather be safe than sorry.
if the o2 sensor is bad it will effect the acceleration and the emissions of a truck
Do you think it could be the air pump?? That falls in both possibilities list...
I am not sure if the air pump fails or how it fails.
You can check for codes, but not with a scanner like auto zone has. You have to jumper two terminals in the DLC and watch for the check engine light flashing. I can't remember off the top of my head which terminals. You should be able to find directions on google
Kain
3/4 ton status
Take the hose off for a second and start it see if its pushing air,then shut it off
I had issues getting my 1990 through a few years back,I ended up retarding the timing so badly that the thing barely had the power to move,but it passed,remember telling the guy what I did and I put the timing back in there parking lot,that was about 10 years ago,since then they changed how they test,and now it goes right through
Jessie James
1/2 ton status
Let me give you a tip. Instead of replacing parts, INSPECT AND TEST THEM. Most of these things you can test, check, or otherwise determine for cheap or free. All you need is a few tools, Google, and some time. Or a buddy with that and a case of beer!
You also should check your coolant temp sensors - there are TWO of them on the 1991. They are crucial for proper engine operation. Again, CHECK YOUR COMPUTER CODES to help determine this.
You also should check your coolant temp sensors - there are TWO of them on the 1991. They are crucial for proper engine operation. Again, CHECK YOUR COMPUTER CODES to help determine this.
Just a bit of clarification. There is only one coolant temp sensor (CTS) which is what the ECM uses to determine engine temp. The coolant temp sender is for the guage and is wholly independent of the ECM.
I mention this because when people start getting parts, this is one of the ones that gets changed for no reason, or because the wrong part is requested at the store. The CTS is two wire, impossible to get the sender instead of a sensor if you know at least that much.
Regardless, testing is pretty easy on all of this stuff, even the CTS. Eaglemark posted the resistance specs vs. temp in another thread here.
I mention this because when people start getting parts, this is one of the ones that gets changed for no reason, or because the wrong part is requested at the store. The CTS is two wire, impossible to get the sender instead of a sensor if you know at least that much.
Regardless, testing is pretty easy on all of this stuff, even the CTS. Eaglemark posted the resistance specs vs. temp in another thread here.
Ok, so sorry it took me forever to reply on here. I wanted to give an update incase anyone comes across this thread and needs help too. I did all the following which helped to pass with flying colors! Not certain which one was the deciding factor or if it was all. They're all valuable nonetheless.
1. Change spark plugs (AC Delco plain jane)
2. Wires and rotor with cap (summit racing kit)
3. EGR Valve (tried cleaning first, not worth it, just replace)
4. Cleaned the entire housing of TBI with Throttle body cleaner
5. Changed air filter (cleaned entire housing too)
6. Put a bottle of Sea Foam in at correct amount of gallons on can directions (ran it for a week, had about quarter tank left with it in it.)
7. Raced the engine on the freeway a couple times (got it good and hot)
8. Went straight to the DMV and passed well below the limits.
It could have been any of these factors but I figured better to know exactly what I did than leave anything out. I personally suspected the EGR and plug change did a great amount. Racing the engine was great advice on this thread as well. Just took it to 80 a couple times and headed straight there. Thanks for all your help! Won't have to worry about it for another 2 yrs. Hopefully I will have my new engine by then.
Oh yeah, no codes came up either in my inspections.
1. Change spark plugs (AC Delco plain jane)
2. Wires and rotor with cap (summit racing kit)
3. EGR Valve (tried cleaning first, not worth it, just replace)
4. Cleaned the entire housing of TBI with Throttle body cleaner
5. Changed air filter (cleaned entire housing too)
6. Put a bottle of Sea Foam in at correct amount of gallons on can directions (ran it for a week, had about quarter tank left with it in it.)
7. Raced the engine on the freeway a couple times (got it good and hot)
8. Went straight to the DMV and passed well below the limits.
It could have been any of these factors but I figured better to know exactly what I did than leave anything out. I personally suspected the EGR and plug change did a great amount. Racing the engine was great advice on this thread as well. Just took it to 80 a couple times and headed straight there. Thanks for all your help! Won't have to worry about it for another 2 yrs. Hopefully I will have my new engine by then.
Oh yeah, no codes came up either in my inspections.
