engine wanting to stall - cause ?

[Yves]

attache a msq and logfile.

Around the 690 timemark I see rpm dipping without an apparent reason. I also felt the dip during a short drive session mainly when braking and going back to first gear.

Any input greatly appreciated.

[Matt Cramer]

Try tuning it to idle at less spark advance, then set up a row with about 4 degrees more timing below your idle row. Trying to idle with too much advance is less stable.

[Yves]

Well, in the past (ms2 and longer ago with a carb) it ran bad with less ignition timing.

With an early timed injection the mixture was a lot richer, so maybe it now will run with less timing.

[Yves]

I made a testdrive today and the car almost stalled after coming to a stop and pulling into the driveway. It picked up again. See point 645 in the log attached.

When looking at the lost sync count, something went on, but I'm not sure what is causing this.

I'm not feeling too good about this as this might indicate a problem that can leave me stranded.
Thanks for any input

Yves

[Matt Cramer]

I'm seeing lost sync reason 2. Can you capture that in a tooth log?

[Yves]

I'm not sure, this is randomly occuring. That would require logging the entire drive and hoping that it will manifest itself.

What is reason 2 ?

[Matt Cramer]

Missing tooth at wrong time.

[Yves]

I'm stumped. How can that be ? A noise issue ?

Attached one of the previous tooth logs I made while idling. Please note that it didn't occur during this log.

Could this be a noise issue ?

I checked my settings in ignition settings and it seems to be ok. The one setting I have doubts about is the "check at tooth number" which is currently set to 0. Should this be 1 maybe ?

BTW : this is one of your crank hall sensors with a Holley 60-2 toothed crank wheel. I seem to be having this issue at low rpm and starting to accelerate again from a stop or very low speed.

PS : how did you see the sync loss number and where is the explanation for these ?

[Yves]

Before making changes, I tried setting the ignition input capture to 'falling edge and made these logs. Had to adjust the tooth number 1 angle from 50 to 48 in order to have the correct ignition timing on the damper as commanded by the ecu. Hope this is correct.

I'm not seeing a sync loss in the logs, but this was just idling.

I cannot understand what I'm seeing here. Before I had one cam line during a block of lines at the crank trigger, now I sometimes see 2 lines of the cam during a block of crank lines...

Can someone explain ? Thx

[Matt Cramer]

You will need to actually capture a sync loss in the tooth log to find the answer.

[Yves]

Ok, just went for a little drive (same as previous route where I had multiple sync losses). I have one around 879 sec. Everything is logged with the tooth logger as well (sync error). Hope this gives more info.

If this thread need to be place in another section, please do.

[Yves]

and msq

[Matt Cramer]

I'm afraid the log you posted is blank. Please use the tooth logger instead.

[Yves]

Tooth log. Not sure if the issue was there. I'm seeing one long bar and a short one...

[Matt Cramer]

Tooth log. Not sure if the issue was there. I'm seeing one long bar and a short one...

The bar after the missing tooth (long bar) is a little longer than it should be, but it should still sync. Not seeing a cause of loss of sync in that one.

[Yves]

I have the impression this is going to haunt me forever.

Sensor fault ? BTW this is one of your sensors Matt.