MS2 Cold Start Issues

9

93CobraUSAF

New Member

Sep 14, 2019

11

0

1

Maine

Sep 14, 2019

#1

• Sep 14, 2019

• #1

Greetings to all,

Currently running the diyautotune MSPNP Gen 2 v1.2 on my 93 turbo stang with a standard 302/GT-40x heads/F-cam running with FRPP 42lb injectors.

I initially, downloaded the base tune from DIY and have been tuning. So far, it idles and runs really good.

The issue I'm having is with cold starts...when I start it, it barely stays running and oscillates ~500rpm (+/- 100rpm). Sometimes it dies but, once it reaches operating temps, the idle is spot on.

I've ran the Warm-Up Enrichment tuning but it doesn't help, after which, I revert back to the original numbers from the base tune.

I've attached the MSQ file and a short data log.

Any assistance/advice would be greatly appreciated.

Thanks!

 

Attachments

• Cold Start.msq

  90.6 KB · Views: 223
• 2019-09-14_11.54.42.msl

  796.6 KB · Views: 202

a91what

SendMeUrDataLog

10 Year Member

Apr 6, 2011

10,739

6,720

214

Hillsborough county

Sep 14, 2019

#2

• Sep 14, 2019

• #2

I am out right now, if I dont check back in by tomorrow morning bump your post. You should check out the warm up pwm% duty and cranking duty% tables. These are where you set the idle speed by temperature, it's a basic way to do idle (open loop) but works great for some.

 

9

93CobraUSAF

New Member

Sep 14, 2019

11

0

1

Maine

Sep 14, 2019

#3

• Sep 14, 2019

• #3

Sounds good...Thanks.

 

9

93CobraUSAF

New Member

Sep 14, 2019

11

0

1

Maine

Sep 15, 2019

#4

• Sep 15, 2019

• #4

a91what,

Thanks for the guidance!

Per your recommendation, I increased the PWM % Duty and it solved the issue. I'll be making adjustments each first start of the day to fine tune it.

Thanks again!

Now gotta work on the PIMPxs

 

a91what

SendMeUrDataLog

10 Year Member

Apr 6, 2011

10,739

6,720

214

Hillsborough county

Sep 15, 2019

#5

• Sep 15, 2019

• #5

Closed loop imho is the better way to go but requires a bit more experience to setup. What is your idle speed?

 

9

93CobraUSAF

New Member

Sep 14, 2019

11

0

1

Maine

Sep 15, 2019

#6

• Sep 15, 2019

• #6

Idle speed is 900ish.

 

a91what

SendMeUrDataLog

10 Year Member

Apr 6, 2011

10,739

6,720

214

Hillsborough county

Sep 15, 2019

#7

• Sep 15, 2019

• #7

F303 will idle as low as 700 steadily with closed loop idle and some ignition advance. It's not easy to get it there but it can be done without the car stalling out or seeming off.

Keep it up, your making good progress.