.....oxygen sensor!


I'm using a 730 ECM to run a RamJet 350. I spent half the day trying to smooth out my idle. I'm trying to figure out what this engine wants. The RamJet manual has quite different settings (for the MEFI), as compared to the type 350 V8 using the ECM.

Anyway, anyone have a recommendation for a Wide Band Oxygen sensor to use with a 730 ECM? I'm going to do some searching and see if I can find a bin that already has this incorporated....but first I'd like to identify a recommended WB sensor.

 

Stock ramjet cam?

Should be fairly easy to make idle well.

I just did an American Iron 305 TPI 5spd w/ a 220/230 cam and she idles purty good, took me about 20 minutes or so to make it rev clean and idle stationary. Going to do the rest this week.

Have u gone thru the stickies and read everything concerning idle 2-3 times?

Lots of good info there.

Also when doing idle, dont be suprised whatsoever if u go from fuel to timing to IAC to TB screw and back again, sometimes its a serious pain, most of us have been there.

later
Jeremy

 

ain't that the truth

 

I'll go re-read those some of those idle stickies again. I've got it running halfway smooth, but not really. The RamJet manual has some weird values like setting the timing at 10 degrees .....I'm trying to ignore all that and just make it run where it wants. I wish I could read my MEFI so I could get an absolute stock bin and start there.

 

The RamJet manual has some weird values like setting the timing at 10 degrees

This is probably the base timing for the distributor. Which is where it is set within the MEFI ECM. Setting it else where will either remove or add timing across the board.

Basically the base timing is used during crank, limp mode, and when a code 42 error is present.

The ECM needs to know the base timing as it accounts for it within the timing calculations.

With being able to program the calibration you can set the base timing anywhere. Then set it the same within the calibration (typically called the initial timing in the definition file).

RBob.

 

Removing some values from the SA & Retard "RPM Error" tables can help reduce the amount the spark changes at idle.
I cut the values in half for the lower ends of the tables and the variance was only half of what it previously was swinging.
That combined with slightly shifted O2 values helped my idle calm down and not run rich.
Also check that the 100 kpa values in the idle area of your main SA table are close to your closed throttle table settings.
the 100 kpa values are used when the temp is not up yet. (Z69' revealed that lil tidbit that has plagued many)

 

Why would they do that?

...so during warm-up its going to run at the 100kpa values of 600/800rpm on the spark table?