Dwell reading feedback

[Timeless]

Looking for feedback on dwell reading on my stage 2 auto car. Reading drops significantly after 2-3 minutes from a cold start. The cars runs and drives well just want to verify C0 setting after the WUR was replaced.

All components replaced recently:
- 02 sensor (BOSCH)
- thermistor
- vac lines under intake
- spark plugs
- fuel injectors w/DPI seals
- WUR
- cap/rotor
- NOS ignition coil
- DPI alternator kit

Video:
https://drive.google.com/file/d/1N2K...ew?usp=sharing

[82DMC12]

Yes, it appears you need to turn the CO screw anti-clockwise - it is far too lean once it goes into closed loop.

Sent from my Pixel 6a using Tapatalk

[Helirich]

Looking for feedback on dwell reading on my stage 2 auto car. Reading drops significantly after 2-3 minutes from a cold start. The cars runs and drives well just want to verify C0 setting after the WUR was replaced.

All components replaced recently:
- 02 sensor (BOSCH)
- thermistor
- vac lines under intake
- spark plugs
- fuel injectors w/DPI seals
- WUR
- cap/rotor
- NOS ignition coil
- DPI alternator kit

Video:
https://drive.google.com/file/d/1N2K...ew?usp=sharing

So did you do the ?send in the WUR and wait for rebuild? thing? If so what was your experience? My WUR is not working electrically. (It still works off the radiant heat.) Not really a problem in the summertime, but it takes a bit to run right in cold weather. I hate the idea of sending in my WUR, but I would like this fixed.

[82DMC12]

I know someone who had their fuel distributor rebuilt by https://fuelinjectioncorp.com/ and they did a good job. Looks like they can also do CPR's and other stuff.

[Timeless]

So did you do the ?send in the WUR and wait for rebuild? thing? If so what was your experience? My WUR is not working electrically. (It still works off the radiant heat.) Not really a problem in the summertime, but it takes a bit to run right in cold weather. I hate the idea of sending in my WUR, but I would like this fixed.

I purchased a rebuilt unit and sent my core back.

[Ron]

Let the engine totally warm up before making any changes.
Plug the adjustment access hole with you finger when reading.
Right = Richer = CW
Left = Leaner = CCW

[Timeless]

Let the engine totally warm up before making any changes.
Plug the adjustment access hole with you finger when reading.
Right = Richer = CW
Left = Leaner = CCW

Thanks. Plan is to let cooling fans cycle before any adjustment.

[82DMC12]

Thanks. Plan is to let cooling fans cycle before any adjustment.

After you make an adjustment, good idea to close it all up and go for a spirted drive around the neighborhood, then come back and check CO immediately when you pull into the driveway/garage again. You will want to burn off any contaminates on the O2 sensor in case it got fouled up from too much idling or bad mixture.

[Bitsyncmaster]

Thanks. Plan is to let cooling fans cycle before any adjustment.

With all my testing of O2 and lambda, I suggest you also hold a cruse RPM (about 2500) for a minuet or two after it's warmed up. It seems that clears any carbon off the O2. I think long idles builds some carbon on the O2.

Or go for a short drive.

[AugustneverEnds]

I know someone who had their fuel distributor rebuilt by https://fuelinjectioncorp.com/ and they did a good job. Looks like they can also do CPR's and other stuff.

FIC rebuilt my distributor and CPR last year, cured many of my car's little annoying issues (flat acceleration spots, occasional stalls), FIC also cleaned up the exterior of both parts so they look new, and their total cost was equal to what I was quoted from other places just to rebuild the distributor. I will definitely give them my business again if I have any more fuel injection projects down the pike.