long crank slow start
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hello to those kind and wise enough to know what's going on and help.
so basically i got a new pnp2 went to start it and it took about a minute of cranking and power cycles to get the car to start. I figured it was the old "you never start a new computer on the first try" thing. then i tried to start it again and same thing. i was able to play with my timing and fuel, and now the car starts after ~ 10s! I dont think that is good enough so I'm here for advice. I know my way around tuner studio but I am NOT a tuner. What I have done so far: checked base timing and set to 10 deg. set timing map to this: https://cimg4.ibsrv.net/gimg/www.mia...7cb79826bb.png set fuel to this: https://cimg7.ibsrv.net/gimg/www.mia...64a167f4f5.png all help is appreciated! anything else needed available on demand! |
So i'm no expert, heck i'm barely a novice so I may be wrong. These are the notes I have regarding start-ups that I wrote. I'm hoping somebody more experience can chime in and confirm if what I wrote is correct. If so, the notes may be of help to you. If they are incorrect somewhere, then please tell me
Fuel Prime (Pulse Prime Table) Fuel delivered with key-on. This shoots fuel into the walls and back of the valve to remove air from system. This helps when starting engine when cold starting. Cranking Fuel Table After Fuel Prime, the Cranking Fuel Table takes effect. Cold engine needs more fuel than a warm engine. This is coolant temperature based Lot of cranking means more fuel needed. Hard cranking that requires throttle needs less fuel After start Enrichment (ASE) Occurs right after Cranking Fuel Table for when the car starts to idle. As the engine warms up (20 or so seconds), the number tapers downwards as less fuel is needed. The main Fuel Table is used after ASE ends. |
Originally Posted by skylinecalvin
(Post 1492578)
So i'm no expert, heck i'm barely a novice so I may be wrong. These are the notes I have regarding start-ups that I wrote. I'm hoping somebody more experience can chime in and confirm if what I wrote is correct. If so, the notes may be of help to you. If they are incorrect somewhere, then please tell me
Fuel Prime (Pulse Prime Table) Fuel delivered with key-on. This shoots fuel into the walls and back of the valve to remove air from system. This helps when starting engine when cold starting. Cranking Fuel Table After Fuel Prime, the Cranking Fuel Table takes effect. Cold engine needs more fuel than a warm engine. This is coolant temperature based Lot of cranking means more fuel needed. Hard cranking that requires throttle needs less fuel After start Enrichment (ASE) Occurs right after Cranking Fuel Table for when the car starts to idle. As the engine warms up (20 or so seconds), the number tapers downwards as less fuel is needed. The main Fuel Table is used after ASE ends. |
It's all dependent on the car. I am struggling with this as well. It is trial and error. Once you get the car idling playing with the idle ve table will help stabilize it. Ensure you have no vacuum or boost leaks or you wont ever get a stabile idle. Make sure base timing and all sensors are calibrated right. Playing with priming pulse helped me a lot.
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Remember you'll generally be cranking below 500rpm, and at 100kpa, so everything is based off the 500rpm/100kpa cell. So in your case your ve is 58, timing is 18 degrees.
You can try two things, bump that fuel cell up ~10-20% to see if it needs more fuel, or crack your throttle while cranking to see if it wants more air. If that's the case, you'll want to increase your cranking duty. |
Originally Posted by curly
(Post 1492621)
Remember you'll generally be cranking below 500rpm, and at 100kpa, so everything is based off the 500rpm/100kpa cell. So in your case your ve is 58, timing is 18 degrees.
You can try two things, bump that fuel cell up ~10-20% to see if it needs more fuel, or crack your throttle while cranking to see if it wants more air. If that's the case, you'll want to increase your cranking duty. |
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