Poor Cold Idle (Yes I searched)

[Appauldd]

Logic....did you remove the EVAP stuff as well???

Question: Can you dive a little deeper into the "Idle Stability Timing Control" table? I as because on the 94170008 the settings are WAY different from the 9653. Also there is still one section of it that is unknown.

I ask because I am curious if this table can get the car to get to it's idle setting faster, thus curing the 2K rev.

What are your theories on the 2k rev?

[logic]

The FPR and EGR solenoids and lines, as well as evap canister and related items, are all long gone, with the EGR port plugged at the head. Everything is physically removed.

In my last round of changes (which accompanied getting rid of the 2000 RPM idle), I finally got back around to disabling lean spool (FBA bit 0), completely zeroed out the "Warmup Retard Control" table, copied the open loop load and throttle #1 and #2 tables from 96940011, and made a few final tweaks to "Initial Cranking IPW vs Coolant Temp" to help with cranking.

I'd probably be looking at either the "Warmup Retard Control" (ie. "Percent Low Temp Timing Trim vs. Coolant Temp") or "Open Loop Load/Throttle" tables as good candidates for being the cause of the problem.

[Appauldd]

So my only change tonight is that I made the Open Loop Load 1 & 2 match my original 94170008 rom. Test to come.

As for setting the open loop change over point....I don't seem to have that table. Can someone post the XML for me?

[logic]

Here's the definition I have for 96530006:

PHP Code:

<scaling name="LT Trim Hz" units="Hz" toexpr="x*6.25" frexpr="x/6.25" format="%.2f" min="0" max="1593.75" inc="6.25" storagetype="uint8" endian="big"/>
<table name="Closed Loop - LT Trim Control" category="Fuel" address="35e5" type="2D" level="2" scaling="LT Trim Hz">
    <table name="Conditions" type="Static Y Axis" elements="4">
    <data>Low -> Mid</data>
    <data>Mid -> Low</data>
    <data>Mid -> High</data>
    <data>High -> Mid</data>
    </table>
</table> 


For the record, I haven't touched these settings (haven't needed it).

[Appauldd]

That isn't the one I was speaking of....I am looking for the "Min Temp For Closed Loop" table.

We can use it to make the car never use close loop if we want.

I think this is it....I created this from the 94170015

<table name="Min Coolant Temp for Closed Loop" category="Global Fuel Settings" address="15aa" type="1D" scaling="Temp"/>

It appears to be working in EcuFlash. The temp is 32* F.

[Fast_Freddie]

Originally Posted by Appauldd

So my only change tonight is that I made the Open Loop Load 1 & 2 match my original 94170008 rom. Test to come.

As for setting the open loop change over point....I don't seem to have that table. Can someone post the XML for me?

Paul, the open loop change over point is the open loop load 1 & 2 tables, whatever rpm/load axis is listed in the table is when the map transitions to open loop... I am not to sure how the open loop throttle 1 & 2 play into the scheme though...

Originally Posted by logic

Here's the definition I have for 96530006:

PHP Code:

<scaling name="LT Trim Hz" units="Hz" toexpr="x*6.25" frexpr="x/6.25" format="%.2f" min="0" max="1593.75" inc="6.25" storagetype="uint8" endian="big"/>
<table name="Closed Loop - LT Trim Control" category="Fuel" address="35e5" type="2D" level="2" scaling="LT Trim Hz">
    <table name="Conditions" type="Static Y Axis" elements="4">
    <data>Low -> Mid</data>
    <data>Mid -> Low</data>
    <data>Mid -> High</data>
    <data>High -> Mid</data>
    </table>
</table> 


For the record, I haven't touched these settings (haven't needed it).

Logic, I believe Paul was talking about open loop load 1 & 2... I could be wrong though...

[Appauldd]

Sorry....I meant the Min Temperature for Closed loop.....I apologize for the confusion.

[Fast_Freddie]

Originally Posted by Appauldd

That isn't the one I was speaking of....I am looking for the "Min Temp For Closed Loop" table.

We can use it to make the car never use close loop if we want.

I think this is it....I created this from the 94170015

<table name="Min Coolant Temp for Closed Loop" category="Global Fuel Settings" address="15aa" type="1D" scaling="Temp"/>

It appears to be working in EcuFlash. The temp is 32* F.

If you change all the load % values in the open loop load tables to 0 it will never go into closed loop either...

[Fast_Freddie]

Originally Posted by Appauldd

Sorry....I meant the Min Temperature for Closed loop.....I apologize for the confusion.

Here it is for 96530706

PHP Code:

<table name="Min Coolant Temp for Closed Loop" category="Global Fuel Settings" address="15aa" type="1D" level="1" scaling="Temp"/> 


[Appauldd]

Woo Hoo....I derived my first piece of XML. I am so proud of myself.

Anyway,

It seems like we all have resolved any cold start & cold drivability issues. The problem now is an annoyance of the RPM climing to 2K after cold start. It does settle after a few seconds.

As I stated earlier about the Idle Stability Timing control......could the sensitivity or possibly the unknown portion of the table affect how quickly the car finds it's base idle settings????

[Fast_Freddie]

I meant to mention that Paul, I switched the Idle stability timing control back to stock, I think 128 vice 146 what you had mentioned earlier also when I did my final change...

[Appauldd]

Are you still getting the 2K rev?

[Appauldd]

In 96940011 the Idle Stablilty Timing Control (ISTC) has the following...

Sensitivity = 91 Timing limit = 10 Untested = 94

Where our v7 and the 9417xxxx roms have the following...

Sensitivity = 128 Timing limit = 8 Untested = 8

So now I am very confused as to what these numbers are for. The timing limit is pretty self explanitory....but the others ? ? ?

[Appauldd]

Anyone make any headway on the 2k rev ? ? ?

[Jorge T]

I've had the same 2k rpm cold start for ever, using 9417 rom, if I immediatly release the clutch in neutral rpm goes down to 1400rpm. Thinking the clutch switch [triggers a flag that] has something to do with the 2k rpm spikeat startup.