Forsaken Cold starts!
12-09-2018, 11:03 AM
#1
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Forsaken Cold starts!
I have searched everywhere and done quite a few things to try and fix my cold starts. I’m in Tucson AZ and it’s not even that cold 😂. I have a 03 with MS3 built by brain. Gt2871 with Stock injectors. Have tried the adjusting following.
- cranking PW
- priming pulse
- cranking advance
- inj dead times
- warmup enrichment
- verified timing
- batch fire cranking
- some things I can’t think of
my hot starts are pretty good but these cold starts are the death of me... it takes like 2 min to finally start. I will post some logs I took when I get home in a couple hours. I’m moving cross country and trying to sell the car before I leave but refuse to sell it like this. Let me know what you think. Let me know if I need to provide any more info.
- cranking PW
- priming pulse
- cranking advance
- inj dead times
- warmup enrichment
- verified timing
- batch fire cranking
- some things I can’t think of
my hot starts are pretty good but these cold starts are the death of me... it takes like 2 min to finally start. I will post some logs I took when I get home in a couple hours. I’m moving cross country and trying to sell the car before I leave but refuse to sell it like this. Let me know what you think. Let me know if I need to provide any more info.
Last edited by 1stgen<3; 12-09-2018 at 11:04 AM. Reason: Spelling
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12-09-2018, 02:23 PM
#3
Cpt. Slow
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Can't help much without seeing the tune and a log, but remember a few things:
1. you need to set deadtime, tune fuel table, tune warmup enrichment. In that order, before and cranking settings should be messed with.
2. remember you only get one or two true cold starts per day, basically morning and night. After that you're wasting a bit of time, but inbetween you should be tuning the above.
1. you need to set deadtime, tune fuel table, tune warmup enrichment. In that order, before and cranking settings should be messed with.
2. remember you only get one or two true cold starts per day, basically morning and night. After that you're wasting a bit of time, but inbetween you should be tuning the above.
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12-09-2018, 02:58 PM
#4
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I have tried them in this order. I also have had a few people take my car and mess with it twice a day on cold starts. When it seems to get better... it eventually will go back to how it was. trying to post tune and data logs now
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12-09-2018, 04:56 PM
#8
Retired Mech Design Engr
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EDIT:
1) turn off Cold Advance.
2) set priming pulse delay to 300mS (0.300)
3) turn off batch fire during crank
4) Set Cranking Advance to 10
Those should all help.
1) turn off Cold Advance.
2) set priming pulse delay to 300mS (0.300)
3) turn off batch fire during crank
4) Set Cranking Advance to 10
Those should all help.
Last edited by DNMakinson; 12-09-2018 at 05:36 PM.
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12-10-2018, 09:51 AM
#10
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Well I took another data log I will post but...Nothing made it better. After about 10 seconds I gave up... didn’t want to let it start and get warm.
I checked for spark yesterday and it was pretty weak, so I changed out my old coils for some “newer” ones I had laying around. Helped on hot start but same at cold. Maybe these coils are going bad too... 😫
I checked for spark yesterday and it was pretty weak, so I changed out my old coils for some “newer” ones I had laying around. Helped on hot start but same at cold. Maybe these coils are going bad too... 😫
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12-10-2018, 10:40 AM
#11
Retired Mech Design Engr
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I did not expect that to be the end, just a starting point so the next log(s) would have more meaning. You definitely need more fuel.
I have also to say that your whole tune is awful, but that I also saw your 2017 thread, so tread lightly if you hope to get any help at all.
In a sense, I am loath to help you get this thing starting well, as I feel that I'll be complicit in your selling this abortion.
Nevertheless, if you will refrain from changing a bunch of stuff, and let us walk through this a step at a time, I surely expect we can get you starting at 70F.
Every time, post both a tune and logs. And, they must correlate.
DNM
I have also to say that your whole tune is awful, but that I also saw your 2017 thread, so tread lightly if you hope to get any help at all.
In a sense, I am loath to help you get this thing starting well, as I feel that I'll be complicit in your selling this abortion.
Nevertheless, if you will refrain from changing a bunch of stuff, and let us walk through this a step at a time, I surely expect we can get you starting at 70F.
Every time, post both a tune and logs. And, they must correlate.
DNM
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12-10-2018, 10:48 AM
#12
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2007 thread? 11 years ago? That’s from when I was 15 with my first NA. Not this car. I have had the 03 for a short time. Ok though. I appreciate the help regardless. I refuse to sell a car that isn’t acting right. Nonetheless I’m here for help not an argument! Let me know what you think I should do next! Thx
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12-10-2018, 12:41 PM
#15
2007 thread? 11 years ago? That’s from when I was 15 with my first NA. Not this car. I have had the 03 for a short time. Ok though. I appreciate the help regardless. I refuse to sell a car that isn’t acting right. Nonetheless I’m here for help not an argument! Let me know what you think I should do next! Thx
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12-10-2018, 12:59 PM
#18
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That was resolved. The problem was the butterflies in the intake. I don’t believe the injectors are the problem for my cold start. I have not had any fuel delivery issues. Also... your right... my old motor had bad compression on cyl #3 but... there is a “new motor” in the car as of a month ago.
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12-10-2018, 01:02 PM
#19
Those injectors that you're trying to run will make short work of your pistons/motor.
Unless by "act right" you mean start, only. In which case i agree, if the rest of the car is working properly (i have my doubts), it should start and idle just fine on those injectors. Nothing more, though.
Unless by "act right" you mean start, only. In which case i agree, if the rest of the car is working properly (i have my doubts), it should start and idle just fine on those injectors. Nothing more, though.
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12-10-2018, 01:11 PM
#20
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Well honestly the only problem I have had with the car is the cold starts. Driving the car has been fine. Even under full boost (7lbs) AFR’s actually are more rich rather than lean. Which will need to be leaned out a tad actually. Normal driving though is fine! 👌🏼
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