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Forsaken Cold starts!

 
Old 12-09-2018, 11:03 AM
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Default Forsaken Cold starts!

I have searched everywhere and done quite a few things to try and fix my cold starts. Iím in Tucson AZ and itís 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 canít 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. Iím 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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Old 12-09-2018, 02:05 PM
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Post tune as well.
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Old 12-09-2018, 02:23 PM
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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.
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Old 12-09-2018, 02:58 PM
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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
Attached Files
File Type: msq
CurrentTune.msq (274.3 KB, 10 views)
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Old 12-09-2018, 03:08 PM
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What fuel system are you running? Ask because still using stock injectors. Or I s this a real low boost setup?
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Old 12-09-2018, 03:10 PM
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Still trying to upload data logs. My computer is being slow. It has stock injectors on 7lbs.
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Old 12-09-2018, 03:20 PM
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data logs
Attached Files
File Type: msl
coldstart.msl (759.3 KB, 9 views)
File Type: msl
warmer cold start.msl (250.6 KB, 7 views)
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Old 12-09-2018, 04:56 PM
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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.

Last edited by DNMakinson; 12-09-2018 at 05:36 PM.
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Old 12-09-2018, 08:16 PM
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Ok thanks! Iíll try in the morning and get back to you. Appreciate it
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Old 12-10-2018, 09:51 AM
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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... didnít 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 ďnewerĒ ones I had laying around. Helped on hot start but same at cold. Maybe these coils are going bad too... 😫
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Old 12-10-2018, 10:40 AM
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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.

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Old 12-10-2018, 10:48 AM
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2007 thread? 11 years ago? Thatís 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 isnít acting right. Nonetheless Iím here for help not an argument! Let me know what you think I should do next! Thx
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Old 12-10-2018, 11:04 AM
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I meant 2017 about not going over 4psi.
Post the latest tune and log of the non-start. I will look it over and give next step.

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Old 12-10-2018, 12:17 PM
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here they are. let me know if I messed something up. thx again
Attached Files
File Type: msq
CurrentTune.msq (274.3 KB, 13 views)
File Type: msl
cold start after changes.msl (260.3 KB, 8 views)
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Old 12-10-2018, 12:41 PM
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Originally Posted by 1stgen<3 View Post
2007 thread? 11 years ago? Thatís 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 isnít acting right. Nonetheless Iím here for help not an argument! Let me know what you think I should do next! Thx
The car isn't going to act right no matter what you do, with that setup.
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Old 12-10-2018, 12:53 PM
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What can I fix on my setup to make it better then?
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Old 12-10-2018, 12:55 PM
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Injectors that are properly sized. Then maybe report back if you ever fixed the issue that was keeping you from making more than 1-2psi.

Probably needs new pistons from the AFRs you were trying to make boost with before, too.
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Old 12-10-2018, 12:59 PM
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That was resolved. The problem was the butterflies in the intake. I donít 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 ďnew motorĒ in the car as of a month ago.
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Old 12-10-2018, 01:02 PM
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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.
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Old 12-10-2018, 01:11 PM
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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) AFRís 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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