What's new
CK5
Register an account today to become a member! Once signed in, you'll be able to participate on this site by adding your own topics and posts, as well as connect with other members.

TPI Failed Emissions

rev your truck at 2000 rpms and see if it changes. Many o sensors will get stuck like that even if they are in operating temperatures.
 
Hossbaby50 said:
............IDLE...............2500rpm...........Limits..........Results
HC PPM...401................103..................400............Fail
CO %.....5.92................4.39................1.50............Fail
Click to expand...

Yet another worthless post being added here.

Should have seen my buddy's 02 Camaro today. Hooked it up to the gas analyzer, at Idle it was cranking out 4700PPM of HCs. Its an LS6 block with healthy camshaft, no EGR(02 didn't have them), no Cats, no AIR injection, and performance tune on the PCM.
 
sled_dog said:
Yet another worthless post being added here.

Should have seen my buddy's 02 Camaro today. Hooked it up to the gas analyzer, at Idle it was cranking out 4700PPM of HCs. Its an LS6 block with healthy camshaft, no EGR(02 didn't have them), no Cats, no AIR injection, and performance tune on the PCM.
Click to expand...


might want to tell him to get another chip burned.
 
What should my O2 sensor output be in mv?

I just checked it with the truck warmed up idleing in park. It was .455-.460mv.

Harley
 
shelbyfordgt said:
might want to tell him to get another chip burned.
Click to expand...

He is just waiting till next week to go get it dyno tuned. It lopes pretty good at idle, at say 1500 RPM the HC dramatically drop. Its running too rich and high at idle, but the guy who programmed it did it just for a temp thing till he can get to the dyno tune.
 
Hossbaby50 said:
What should my O2 sensor output be in mv?

I just checked it with the truck warmed up idleing in park. It was .455-.460mv.

Harley
Click to expand...

steady .455-.460? It should be around there. .450 is generally Sotich(14.7). Crank up the RPMs and check it again. If its not changing at all(I mean more than just .450-.460 something is off.
 
Depends on what you are using to figure the voltage. It should be bouncing all over the place above and below optimum, going rich/lean constantly. If it's staying in one place, it's dead or likely cold.

If using a scanner, you'll see the bouncing in mV/lean/rich. If you disconnect the sensor to test, I'd be surprised if you see that same bouncing, since open loop it's working off of pre-programmed parameters.

My Bosch one wire hovers in the .45mV range, but the system never goes closed loop. Next mod is going to have to be the AFS-74 heated sensor.

As was mentioned, crank up the RPM's or increase the load on the engine. If an O2 sensor is going to get too cold, it will be sitting at idle.
 
Last edited:
sled_dog said:
Incorrect by far. An O2 sensor is a Piezoelectric device. It creates its own voltage through a reaction. IN the case of an O2 sensor it reacts with the oxygen in the air. More oxygen less voltage. An O2 sensor needs to be at 600*F to operate. His problem when it "cools to 150 and runs crappy" is that the O2 sensor also cooled down, out of its operating range, and the computer had to switch into Open Loop mode. An O2 sensors, does just that, it senses oxygen, thus the name. It can't pick up Hydrocarbons, so it has no idea you are running that rich, it just senses less oxygen as a rich condition. Problem is, if you have a cylinder misfire, all it sesnses its tons of oxygen, it can't pick up all that raw fuel. Thus it richens the mixture cause its thinks you are lean(lots of oxygen). Not saying thats whats happening here, just telling you how an O2 sensor works.

Open loop is when the PCM ignores the O2 sensor and just runs its own presets for fuel. This is usually a pretty rich mode, the PCM doesn't want to risk burning down your motor. A heated O2 sensor just helps you get out of Open Loop mode quicker. It really sounds like you had a bad O2 sensor or bad wiring with the three wire. There is no reason it should run anything but better with one.
Click to expand...

Thanks for the correction there bookworm :waytogo:
 
Last edited:
I am using a digital multimeter to test the voltage. My above number is a little off. I just got done doing some tests and it is all over the place.

At idle it is usually around .66-.90 and at 2500 rpm it is .450-.750 roughly most of the time.

Harley
 
Sounds like the O2 is working.

I know I saw it somewhere that very quick changes are not accurately measured with a digital voltmeter. Analog ones work better in that regard, but as long as the thing is moving as you've found, it's working and warm enough. Scanners work the same way, but they are limited by the baud rate of the connection to the ECM, so the "bouncing" of the reading is more pronounced.

Test the coolant sensor. Second page "code 15", ohms/temperature.

More comprehensive chart
 
4xcrazy said:
Thanks for the correction there bookworm
Click to expand...

Sorry if I offended you but a pyrometer and an O2 sensor are two very different things and its important to know when diagnosing and working with a computer controlled vehicle.
 
sled_dog said:
Sorry if I offended you but a pyrometer and an O2 sensor are two very different things and its important to know when diagnosing and working with a computer controlled vehicle.
Click to expand...


If he knows how a o2 sensor works then knowing the technical term doesn't matter. How many people know what type of resistor is inside the CTS? It isn't important.
 
sled_dog said:
Sorry if I offended you but a pyrometer and an O2 sensor are two very different things and its important to know when diagnosing and working with a computer controlled vehicle.
Click to expand...


OK now teach him about air fuel sensors! :grin: Wait, do you know what those are?!!!?!?!? It might jsut be a CA smog thing for now.
 
No, sorry, you didn't, i was wrong, no biggie, just didn't get the smiley in there at the end of the sentence, sorry bout that.

The info i mentioned is just what i was told, must have something like a basic way of how it sorta kinda works or something, been awhile since i messed with the o2 sensors.


I went back and fixed it. Mentioned the bookworm thing, just as a little humor, you are attending an auto tech college, right?


oh, and sorry for the hijack,,, :D
 
I guess you got it to pass? I saw you down at the DMV today - I was there picking up some building permits. When I waved as you were driving by you didn't notice. :D
 
I saw the Biltrite sign truck and thought it might be you but I couldn't see threw the windshield very well and figured if it was you you would honk or something.

Harley
 
UPDATE...

TPI has now Passed emissions. I reinstalled the 1 wire O2 sensor and ran the truck threw emissions today. It passed with almost no CO readings at all. I guess I got a bum 3 wire O2 sensor. It made my truck run like crap and it made me fail emissions. I passed them today and I got my truck registered and got my license plates.

My truck still has the problem of running weird when it is around 140-180* though. I don't know what it is. I will figure that out later. I have another year before emissions is due again.

Thanks for everyone's help.

Harley
 
Hossbaby50 said:
I saw the Biltrite sign truck and thought it might be you but I couldn't see threw the windshield very well and figured if it was you you would honk or something.

Harley
Click to expand...
I never think of the horn until it's too late.

Did you get personalized plates?
 
Not yet. I picked up the form to order them though. They are kinda pricey but when I get a little more cash I will go ahead and order them. My truck is to conspicuous to not have personalized plates.

Harley
 
You must log in or register to reply here.

Latest Posts

Top Bottom