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cold start/ hot restart

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 Post subject: cold start/ hot restart
PostPosted: Mon Sep 24, 2012 6:58 am 
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my cold start is great, car fires up just fine, if you try to rev it or drive it, it dies, I'm using a iic on a vr6. You can drive through it till it warms up but its annoying, and on a hot restart it cranks and cranks unless you mat the throttle and after multiple cranks it will fire. any help would be great


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cold start.CSV [21.59 KiB]
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cold start.PNG
cold start.PNG [ 70.02 KiB | Viewed 782 times ]

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 Post subject: Re: cold start/ hot restart
PostPosted: Mon Sep 24, 2012 7:21 am 
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mach 2 with my hair on fire

Joined: Tue Apr 27, 2004 8:33 pm
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Location: Arvada, CO.
If it idles but wont drive then your load fueling is not correct.

You need to store and post the log file (csv) for us to figure out whats going on.


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 Post subject: Re: cold start/ hot restart
PostPosted: Tue Sep 25, 2012 5:47 am 
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I have the csv file up there. It does drive and it drives pretty good, I'm using MAP only throttle and I'd like to fine tune the fueling a little better on the cold start, I'm thinking of a stock vehicle that you can fire up and drive 10 seconds after key up and I cannot do that, ( am I wrong to think that with a stand-alone?). I'll go fire it up and do a log from a cold (60 F) start up and put that one up, the one I have above is after running for a few mins as I forgot to click "start log" :frustrated:

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03 M-5
05 s4-sold
04 a4 VR6
01 2.5rs (wrx)-sold
95 sc 300
92 240sx -sold
71 vw type 3(wrx)-sold
69 subaru 360
2002 A6 3.0 (winter beater)-sold


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 Post subject: Re: cold start/ hot restart
PostPosted: Tue Sep 25, 2012 6:04 am 
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Try this one


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2nd coldstart.CSV [64.73 KiB]
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03 M-5
05 s4-sold
04 a4 VR6
01 2.5rs (wrx)-sold
95 sc 300
92 240sx -sold
71 vw type 3(wrx)-sold
69 subaru 360
2002 A6 3.0 (winter beater)-sold
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 Post subject: Re: cold start/ hot restart
PostPosted: Tue Sep 25, 2012 7:04 am 
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mach 2 with my hair on fire

Joined: Tue Apr 27, 2004 8:33 pm
Posts: 2564
Location: Arvada, CO.
Other than a short triggering glitch early on, your data looks fine.

One comment though, how do you know what the AFR is to be able to tune the CLT based multiplier?

Looks like you are using v1.02 firmware. It has features that allow you to setup a richer mixture for some time after startup.
You also have full control over the temp multiplier tables, which is almost undoubtedly where your problem is.

OEMs achieve reasonable driving fairly quickly by having a well sorted map, proper air and coolant temp compensation, and having a fast wideband sensor that can take closed loop control of the engine in less than 20 seconds after startup.

So that I am clear, there is not much of a point in worrying about cold start and running parameters if the basic mapping is not yet right. If there are any holes in your "at temp" mapping, get them resolved first as having a hole in the map will be even worse at colder temperatures.

This and pretty much all other standalone ECUs have enough maps and compensation for an OEM driving experience, provided you spend the time to tune it out.


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 Post subject: Re: cold start/ hot restart
PostPosted: Tue Sep 25, 2012 11:27 am 
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Thank you for looking at this,it means a lot. I have a wide band, I did mess with the post fueling and it helped with my lean tip in on cold start, it seems " studdery" when cold still, its pretty solid when its at normal temps. still a bit " twitchy" and I figured its from the DBW with no TPS input

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03 M-5
05 s4-sold
04 a4 VR6
01 2.5rs (wrx)-sold
95 sc 300
92 240sx -sold
71 vw type 3(wrx)-sold
69 subaru 360
2002 A6 3.0 (winter beater)-sold


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 Post subject: Re: cold start/ hot restart
PostPosted: Tue Sep 25, 2012 11:29 am 
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Oh and what do you think about my hot restart taking so many cranks to fire up and having to mat the throttle, not rich enough? and back to the cold start, I think I'm gettin a lean pop in the intake if I stab the throttle, too much timing?

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03 M-5
05 s4-sold
04 a4 VR6
01 2.5rs (wrx)-sold
95 sc 300
92 240sx -sold
71 vw type 3(wrx)-sold
69 subaru 360
2002 A6 3.0 (winter beater)-sold


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 Post subject: Re: cold start/ hot restart
PostPosted: Tue Sep 25, 2012 1:03 pm 
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mach 2 with my hair on fire

Joined: Tue Apr 27, 2004 8:33 pm
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Location: Arvada, CO.
EuroWrench wrote:
Thank you for looking at this,it means a lot. I have a wide band, I did mess with the post fueling and it helped with my lean tip in on cold start, it seems " studdery" when cold still, its pretty solid when its at normal temps. still a bit " twitchy" and I figured its from the DBW with no TPS input


The wideband doesnt seem to be connected to the ECU, so you cant correlate the AFR with any of the ECU data.
Cold temps will require a richer AFR than at hotter temps since fuel will fall out on the cold intake walls and ports.
Are you setup for MAP input for the acceleration enrichment source?

Lastly, you should increase the logging speed to fast as it will go, 1 log per second is tough to see tip in effects.


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 Post subject: Re: cold start/ hot restart
PostPosted: Tue Sep 25, 2012 7:32 pm 
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I just double checked my wide-band wiring and I believe it is correct, its an AEM if that matters. I have EGO wide band checked?


Attachments:
rich idle cold.CSV [180.02 KiB]
Downloaded 19 times

_________________
03 M-5
05 s4-sold
04 a4 VR6
01 2.5rs (wrx)-sold
95 sc 300
92 240sx -sold
71 vw type 3(wrx)-sold
69 subaru 360
2002 A6 3.0 (winter beater)-sold
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 Post subject: Re: cold start/ hot restart
PostPosted: Tue Sep 25, 2012 8:08 pm 
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mach 2 with my hair on fire

Joined: Tue Apr 27, 2004 8:33 pm
Posts: 2564
Location: Arvada, CO.
Your wideband is reading 1.11 lambda pretty much continuously in the ECU log.


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