3 wire o2 conversion

[smoothandlow84]

Now both of us have a useless part.

 

[74 Shortbed]

Yup!!!!..

 

[1987 GMC Jimmy]

I don't think I'll do it whenever I switch to headers. The theory behind it makes perfect sense, but if it didn't do anything in practice, I won't even bother. I wonder why you have that Code 44, Art. I did the base gasket on mine, and it wasn't even bad, but I noticed a nice little improvement in idle quality. Or maybe EGR.

 

[74 Shortbed]

I I wonder why you have that Code 44, Art. I did the base gasket on mine, and it wasn't even bad, but I noticed a nice little improvement in idle quality. Or maybe EGR.

Beats the hell out of me, but I noticed at idle if you barely touch the throttle it'll stumble like a carb with not enough pump shot, and at certain rpm's it'll surge, so there is something wrong somewhere...

 

[4WDKC]

I have noticed in my scanner that the ecm goes back to open loop at idle when the truck is warm and have read the true duals and no cat is the reason.

 

[74 Shortbed]

Mine is factory single.

 

[smoothandlow84]

I have full length headers, no cats and, dual 40 series flowmasters, no codes. Idles fine, runs like a raped ape and smooth idle.

I just have the useless heater o2 sensor that I was informed was absolutely necessary.


As far as your stumble and surging Art...possible a distributor issue or ignition? I have heard over time the distributor on these truck wear out causing timing jumps.

 

[bucket]

Long ago, I put headers and duals on my Burb and ran the stock single wire sensor and it was fine. I also ran a 180 stat which everybody always says you can't do with TBI. It was a daily driver, all year round. I ended up putting a heated sensor in after a while, mostly to see what it did. Well, it didn't do much. In very cold weather, it goes into closed loop sooner, but that's it.

So does it make an improvement? Not really. You certainly don't NEED it like some guys say. Oh yeah, and needing a 190 stat is complete BS too. Even a 160 works fine, but heat output suffers slightly.

 

[74 Shortbed]

As far as your stumble and surging Art...possible a distributor issue or ignition? I have heard over time the distributor on these truck wear out causing timing jumps.

Yeah, that did go through my mind so I put my light on it and timing was smooth up and down the rpm range, or at any given rpm never jumped around??... I was wondering though, what about the TPS are they adjustable or stationary??, if it's out of adjustment that could throw things off wouldn't it???, I'm just fishing here don't have a clue on this ****, lol..

 

[yevgenievich]

Stick a multimeter probe on tps and see if the voltage is in a smooth movement from about 0.5 to 4.5/5v

Yeah, that did go through my mind so I put my light on it and timing was smooth up and down the rpm range, or at any given rpm never jumped around??... I was wondering though, what about the TPS are they adjustable or stationary??, if it's out of adjustment that could throw things off wouldn't it???, I'm just fishing here don't have a clue on this ****, lol..

 

[74 Shortbed]

Stick a multimeter probe on tps and see if the voltage is in a smooth movement from about 0.5 to 4.5/5v

Thanks, I'll give it a shot..