Weird $OD Spark Advanced FIXED, sorta

[dave w]

sometimes i have to put a,b and so on in the file i started with my files get corrupted some times for no reason?

I used my Ostrich 2.0 to verify buffer with chip to confirm the Memcal file vs. the file I downloaded from gearhead-efi.

[delcowizzid]

Your guys xdfs are weird I wondered why the factory cal only had 15 degrees at 100kpa its setup to minus the bias off the main spark tables for some silly reason edited xdf and pow real spark figures 28 degrees up top at full throttle lol.have you ever confirmed actual advance matches commanded advance before this issue

[1project2many]

The bias is subtracted from the main spark tables. The values shown in main tables don't match actual spark advance unless the bias is taken out.

[dave w]

It's HAPPEN AGAIN!!

I have another vehicle with a WEIRD Spark Advance!

SA hotidle 12-08-18.jpg

SA Combined 12-07-18.jpg

Two completely different vehicles, one in Oregon the latest in California. One external engine difference is BOTH are using Holley TBI Throttle Bodies.

Lighting CAN strike twice in the Same Place!

dave w

[brian617]

Dave, I've seen weird glitches like that with unrealistic numbers even with a Snap On scanner. I just chalked it up to intermittent communication issues with older obd1 vehicles. The question is are the symptoms related to the glitches in displayed spark advance? Cause and effect sort of speak.

[S.O.B.B.]

I also get weird spark numbers.I also thought it was just glitchy.it has not given any symptoms of any kind I'm identifying in logs.20181211_164956.jpg
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[dave w]

The engine is running poorly, with or without TunerPro RT connected. I'm going to jump off the cliff and make the bold assumption, the spark is going negative without TunerPro RT connected.

It's really weird, absolutely nothing in common between the two vehicles, expect both recently had installed Holley Throttle Bodies. Both vehicles ran great for a period of time after the Holley Throttle Bodies were installed, then not!

Nothing in common means: different definition files, and different computer part numbers. The first vehicle had the problem using a bone stock chip. The second vehicle has a custom chip from me, using a G1 adapter.

dave w

[Fast355]

The engine is running poorly, with or without TunerPro RT connected. I'm going to jump off the cliff and make the bold assumption, the spark is going negative without TunerPro RT connected.

It's really weird, absolutely nothing in common between the two vehicles, expect both recently had installed Holley Throttle Bodies. Both vehicles ran great for a period of time after the Holley Throttle Bodies were installed, then not!

Nothing in common means: different definition files, and different computer part numbers. The first vehicle had the problem using a bone stock chip. The second vehicle has a custom chip from me, using a G1 adapter.

dave w

My first question given my experience with Holley TBI units would be is the MAP sensor signal connected to the correct port on the throttle body. I have had better luck not using the one on the rear of the TBI unit. If you look at the way the throttle body is cast and the way the IAC ports are configured the port on the rear sits right in an area where the IAC gives it a false reading as it opens wider. The Holley units have a full manifold vacuum port on the front of them that gives more consistently reliable results. Cold startup and warmup will be exceptionally bad with the low vacuum reading delivered with the IAC opening. There was a good picture on here of the IAC port and how the rear vacuum port intersects it.