Car feels really flat initially

[Tordne]

On the first start of the day (cold start) the car feels really flat and limp initially.

My initial thoughts were that it was related to the spark being retarded by the B5910 ECT Spark Table and the B5956 Multiplier Table.

I basically set the Multiplier Table to all 0 so that essentially no spark would be pulled. This seemed to make little or no difference .

So the question is: What else could it be?

Cold start for me these days is about 15*C (60*F) so not really that cold.

Cheers,

[TAQuickness]

On the first start of the day (cold start) the car feels really flat and limp initially.

My initial thoughts were that it was related to the spark being retarded by the B5910 ECT Spark Table and the B5956 Multiplier Table.

I basically set the Multiplier Table to all 0 so that essentially no spark would be pulled. This seemed to make little or no difference .

So the question is: What else could it be?

Cold start for me these days is about 15*C (60*F) so not really that cold.

Cheers,

Have you tried slipping a Viagra into the gas tank 30 minutes before cranking?

But seriously, at what point does the beast feel plump and erect? And how long has this been going on? If it last more than 4 hours, I think you should call a doctor.

[ringram]

Maybe down to bad atomisation of the charge due to cold intake tract which will tend to condense the charge rather than assist atomisation.
Could be dirty injectors not making a nice spray, just squirting a pool of fuel into the port.

[SSpdDmon]

Maybe because initial, cold start commands OL for a couple of minutes?

[joecar]

Could it be too lean immediately after startup...?

[Tordne]

Maybe the Viagra is the trick

I'll let my WB heat up for a long time before startup this morning so that I can accurately get the AFRs from cold start, usually I don't care.

It doesn't last too long which is why I thought it must have been those ECT Spark tables. But those retard timing up to about 70*C odd. And it definitely doesn't last that long. So, I'm not really suspecting spark at this stage.

Will post more lately

Cheers,

[dc_justin]

Could it be too lean immediately after startup...?

My thoughts. My truck runs a bit rich when cold and has very good throttle response, even with the light throttle I give it.

[Tordne]

OK so the winner would appear to be REAL LEAN. I marked a couple of points where it felt flat and the AFRs were around the 16.6:1 mark with a commanded AFR of approx. 14.7:1.

I have another question as a result of this logging though. I logged a PID called "IAC - Warmed-up Airflow In Gear" (GM.IAC_WD_DMA). This has a value of approx 8 grams/s and gets decayed out gradually. I'm wondering if this added airflow could be causing the lean condition? And, which tables does this PID relate to (doesn't say in the "More info" pane)?

Cheers,

[TAQuickness]

when did you start having this problem?

[Tordne]

Quite a while... I just thought I go about trying to fix it. Tune is otherwise pretty solid right now so I need something else to mess with