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Mixture enrichment after a cold start.
Posted: Sat Nov 27, 2010 6:17 am
by trakkies
RV8 with EDIS and MS II V3 latest code.
I'm having cold start issues - or rather it fires when cranking but then stops. After a couple of goes it then runs. I suspect the mixture is a bit weak while warming up - but the trouble is altering something can't then be proved until it cools down again.
At the moment it's set to approx 148% enrichment at 0C - is that in the ballpark? Or what sort of A/F ratio should I be seeing from the WB sensor?
All at idle - it drives off fine.
Re: Mixture enrichment after a cold start.
Posted: Sat Nov 27, 2010 9:24 am
by nismoryco
You probably need to adjust your after start enrichment a bit, too. My engine also likes a bit of cold advance to help get things going after cranking.
Re: Mixture enrichment after a cold start.
Posted: Sat Nov 27, 2010 2:01 pm
by stevemgb
mv 3.5 rover v8 uses ms1extra with warmup at160% and ASE of 60% for 16secs at 0C and seems ok.Dont know if ms2 is much different hope to have been helpful,Steve.
Re: Mixture enrichment after a cold start.
Posted: Sat Nov 27, 2010 3:30 pm
by trakkies
stevemgb wrote:mv 3.5 rover v8 uses ms1extra with warmup at160% and ASE of 60% for 16secs at 0C and seems ok.Dont know if ms2 is much different hope to have been helpful,Steve.
Thanks Steve I'll give that a try. The snag as I said is you don't get many chances to experiment. ;-)
Re: Mixture enrichment after a cold start.
Posted: Sun Nov 28, 2010 6:19 am
by trakkies
stevemgb wrote:mv 3.5 rover v8 uses ms1extra with warmup at160% and ASE of 60% for 16secs at 0C and seems ok.Dont know if ms2 is much different hope to have been helpful,Steve.
I've used the 160% at 0C and smoothed out the rest. When it did start, it idled fine without touching the throttle. So a big improvement.
It does take some churning before it fires, though. Any tips there?
Re: Mixture enrichment after a cold start.
Posted: Sun Nov 28, 2010 1:32 pm
by stevemgb
Either too much or more probably too little cranking pulsewidth.I use 11.8 at -4C and 10.6 at 7C which seems ok,fires in 1-2secs.I find the rover motor is very accepting of poor fuelling when running but is very easy to flood when starting.With these settings if it does not start in 3-4 secs I have to use flood clear which always has worked.Steve..
Re: Mixture enrichment after a cold start.
Posted: Mon Nov 29, 2010 1:57 am
by trakkies
stevemgb wrote:Either too much or more probably too little cranking pulsewidth.I use 11.8 at -4C and 10.6 at 7C which seems ok,fires in 1-2secs.I find the rover motor is very accepting of poor fuelling when running but is very easy to flood when starting.With these settings if it does not start in 3-4 secs I have to use flood clear which always has worked.Steve..
Ah. Mine is set to 11 at -40C and 3 at 71C. I'll try those.