fbgh2o

I recently replaced my WB O2 converting from an Innovate LC-1 and gauge to a Prosport Gauge with a UEGO controller. This was done principally to ensure all of my gauges were the same. (I know that the Innovate is considered an excellent product, but honestly I have had difficulty with it from the very beginning. It has been really hard to get calibrated and stay calibrated. More recently it has been erratic.) When it was working it was showing 14.7 AFR at idle and constant throttle. However, I have always believed that the car has been running a tad rich based on carbon in the tail pipe.

The new gauge seems to indicate that the rich condition does exist with idle of 14.2 to 14.4 and 14.2 at constant throttle.

My FQS is adjusted to -3% (Position 2) already. Any thought on what else I could do to lean things out a bit?

Rogue_Ant

You can jumper the altitude sensor... this will pull out an additional 6% of fuel.

fbgh2o

Thanks Joshua

Tom M'Guinn

I'd want to figure out why it is running rich, especially if stock. It might be trying to tell you something's not working right (fuel pressure regulator, sticky injector, clogged air filter, temp sensor, O2 sensor, air flow meter, etc.), or that some new parts are not well matched?

User 52121

+1

I'd be afraid to tune around a problem only to have it come back and bite you later.

I did the same thing with my "rich at WOT" issue... I kept trying to tune around it rather than solve the root cause. It only would have gotten worse.

Is your car running rich anywhere besides idle? I wouldn't think that simply a rich idle would cause a sooty tail pipe. And how do you know the black pipe is not burnt oil, etc?

fbgh2o

Car is not stock. Vitesse MAF with 83 lbs injectors. Almost all parts noted are new within the last 2 to 3 years and air filter was cleaned in the spring. Grounds are all tight and clean.

Car is running without a t-stat (do not flame please - it is a choice that I made based on several consultations with highly capable mechanics and I know that Tom you ran without one for while) and this I know accounts for some of the soot on the tail pipe.

My point was much more along the lines of - it looked fine with the old Innovate and a little rich with the new Uego which has me wondering, which is right?

It is running rich at cruise as well.

Car does not appears to be any oil... I have added may .5L over the last 3K miles and have a know seep in the sump gasket and AOS.

Note the tail pipe of my 951 looks just like the one of my TR6 with unburnt hydrocarbons....

Thank you for the comment although I was looking for constructive input

pontifex4

Fergus, where is your wideband sensor located? Is the AEM bung the same as the Innovate one, and if not, did you change them? (I recall that the Innovate uses quite a deep fitting).

fbgh2o

Thanks. That's is super helpful. I figured that there was likely some level error across sensors. I am not going to get too freaked out by my readings.

Charlie, I honestly did not check the bungs, but do recall that the sensors were very close in overall dimensions. Both sensors are Bosch, the newer one is a five wire and I think the older one is a 4 wire(?).

Chris White installed the bung, so I am relatively confident that it is acceptably placed.

carlege

I would first go to a Dyno and get something more official then check the numbers with that of a computer read out before i did anything.

You can also just double check the Fuel Pressure and verify if it is 3 bar (if thats what your chips require) You are also running stock AFM right?

fbgh2o

Vitesse MAF with 3 bar FPR....

Tom M'Guinn

Did it just start acting up out of the blue or has this always been the case? How are your grounds? Temp sensor?

User 52121

+1 to the question of recency.

The fact that it's running rich on cruise when you should for sure be in closed loop might suggest to me that your narrowband O2 sensor could be going bad.

fbgh2o

Only since I swapped widebands.... The new wideband provides a consistent reading, just about .5 lower than the old one. Grounds are tight and clean, temp sensor reasonably new.

That's something that did not occur to me.... It would be worth verification.