Is there any reasion I can not test the AFM in place with the key on or using the 9 v battery approach?

I believe you can, Rusnak did that exact thing but it is alot easier with the AFM removed and omn the bench.

Draco, when you say loosened 4 clicks, do you mean you adjusted the 'clock spring' to change the resistance against the barn door?

Yes! But I recommend you hook up a LM1 to icheck/nsure proper AFR.

I seem to have the exact same problem but I tested the AFM and it swept evenly across the range when hooked up to a 9V battery. I don't know what else can cause a rich running mixture.

Dennis

I am suspecting my Fuel Pressure Regulator. waiting on Doyle to examine his after swap out. Stay tuned or my BG44K thread. SmileWavy

Interesting thread,..adjusting that spring tension in the AFM is "serious" business.....but it sounds like the instrumentation was inplace to meter! Good news!

I've still NOT installed the part yet, but am trying to arrange the schedule to get some time,..(shouldn't take THAT long just for the part changeout). I don't have my gauges to get the pressure readings post install-even pre-install although my Wrench said they were spec after the fuel pump changeout.

You know, even after the changeout, it may be "prudent" for me to keep the original around, just in case, in perfect working order,..once I'm comfortable with the fresh Bosch piece,..THEN, I'll cut that MOTHER apart and see what a ~23 year old diaphragm looks like?

I WILL get to it, DRACO.

Hoping to autopsy the oil and fuel filters (post BG44K) on Saturday...Rusnak is "interested" in my insolubles,..so, let's go look for such matter, no?

Best to you!

Doyle

I recall reading (long ago) that some piece of the AFM calibration (factory) involved use of laser...anyone know (or have heard of) this?

Best!

Doyle

I was told they were individually calibrated at the factory. Not sure how though.

Yeah, I don't think I'd touch the clock spring. That's what you buy a MoTec for.

I have to go back to source material to re-think Crashr's question. I also should check my own fuel pressure with and without the fpr connected for comparison.

I have a spare AFM, while driving around to zero in the mapping on my chip, Steve W and I messed with the spring to fine tune her. It worked fine but I was insecure so swapped back to my known good AFM.

when one has an eprom and a dyno, one messes with the clock spring with impunity, lol.

:D, well I got the LM-2 now, all vacuum leaks found and fixed. Once I can verify the state of the FPR, will be re-tuning :D

Oh, you sick-o!!!! ....so, how do you like it? Is it awesome? lol :::jealous:::

It is pretty awesome, especially with the RPM reader and SD card to capture the data.

It is here for my buddy's, so when you in town stop by and we can see what she is doing ;)

Always felt bad bothering Steve W, everytime I want to check my AFR. He is so busy and gracious with his time. Well I told him he has a back up if he every needs it :D

I never did get the software working for my LM-1. I sorta wing it with the computer in my lap all the way up to max rpm. You need a chip burner now, brotha!!!