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Old 04-21-2010, 08:27 PM   #1
spyder5016
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Default Car is struggling to start

Hello all,

I just had significant work done on my 2006 WRX including the following:

PPG Gears (straight cut 1 through 4)
Cosworth short block
Upgraded to the Turbo XS FMIC
HTA68 Turbo
BC Coilovers
Clutchmaster clutch
Walbro 255 fuel pump
Other supporting mods for the build

The issue that I am having is that the car seems to struggle to start. So, I would like to hear from others who may have encountered a similar issue. Just to give you a better idea, I need to hit the gas pedal a few times and the car will eventually start. But, it will not start on its own. One final thing that I noticed is the following:

In the morning or after work (when the car has been sitting for a while), the car seems to start almost right away. However, if I go out to dinner and come out an hour later, the car struggles to start. So, I am not sure if it is a fuel issue or what, but something is not quite right there.

Your thoughts/comments are welcome. I really appreciate all your input on this issue.
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Old 04-21-2010, 08:28 PM   #2
Mr_Snips
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what injectors are you running?
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Old 04-21-2010, 08:30 PM   #3
spyder5016
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Top feed 850cc injectors.
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Old 04-22-2010, 08:23 AM   #4
Bamofo
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sounds like a tuning issue. are you using opensource, standalone, cobb protune map? you can find some values to change in romraider to help with the starting issues when your car is warm.
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Old 04-22-2010, 11:14 AM   #5
the suicidal eggroll
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What tune? What did the tune previously cover, how did it run, and what is new?
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Old 04-22-2010, 01:43 PM   #6
907Bum
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Assuming that it's OS tuned and it ran fine before. Then if there are no vacuum leaks i would look at your cranking tables and your warm up tables.
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Old 04-22-2010, 08:37 PM   #7
spyder5016
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I have a Cobb AP version 2 and it was tuned by a very good tuner. I took the car back and he seems to think that it is fine. He indicated that the fuel and boost were perfect and there was no detonation whatsoever.

Using the AP, can I see the warm up table as you stated?
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Old 04-22-2010, 08:43 PM   #8
john 1badSTI
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Your fuel map and boost tables have very little to do with start up.It sounds like when it is cold its ok so like they said above some tweaking needs to be done in the start up maps in the warmer coolant temp load sites. good luck
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Old 04-22-2010, 08:48 PM   #9
spyder5016
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I had a custom map before the tune and then another custom map after the tune. So, since the car was starting fine prior, something else since the new build is causing the car to struggle.

I did notice one thing today when I popped the hood. My battery was changed during the build and the new one is smaller than what I had before. I think it was a honda S2000 battery or something like that. Could that be it?

My initial thought is the battery is not it because the car will "crank crank crank and then start". The car is not struggling to actually crank. So, I don't think it is the battery. But, I am thinking of switching batteries just to make sure
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Old 04-22-2010, 09:22 PM   #10
john 1badSTI
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are the injectors part of the new build?if they are the injector latencies may need tweaked depending on whose they are.It definitely sounds like it is not getting the proper fuel to start when warmed up.
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Old 04-22-2010, 09:29 PM   #11
spyder5016
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Quote:
Originally Posted by john 1badSTI View Post
are the injectors part of the new build?if they are the injector latencies may need tweaked depending on whose they are.It definitely sounds like it is not getting the proper fuel to start when warmed up.
yes the injectors are new. I had the stock blue injectors on my car before
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Old 04-22-2010, 09:51 PM   #12
spyder5016
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Quote:
Originally Posted by john 1badSTI View Post
are the injectors part of the new build?if they are the injector latencies may need tweaked depending on whose they are.It definitely sounds like it is not getting the proper fuel to start when warmed up.
If you are right, can the tuner fix that or is it something that I can mess with? I would prefer a professional to do it (obviously)
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Old 04-23-2010, 11:46 PM   #13
maxpowr
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i'm curious about this myself. i have a 2.0 with id 1000's. 440's open source.starts fine.
550's open source starts fine. 750's open source starts fine. 1000's crank crank crank crank crank crank struggles stumbles sometimes starts sooner then others. once its warmed up starts right up.

my question is what is the issue?

too much fuel not enough fuel? what is actually happening? i have a red top optima so plenty of juice.
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Old 04-24-2010, 12:39 PM   #14
sidewayz
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that sounds like a fuel pressure issue
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Old 04-25-2010, 10:52 PM   #15
spyder5016
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Well we shall soon find out. I am taking my car to another shop this coming Saturday and I will mention all of your potential suggestions. Hopefully, the car will be running smoother by the end of the week.

Assuming the car will be fixed, i will update this thread regarding the reason of this issue.
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Old 07-26-2010, 06:56 AM   #16
spyder5016
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Well, it has been a while and all the major issues have been fixed with respect to the tune. But, the start-up issue is still going on. I am going to ask the tuner to take a look at the start-up maps based on all of your suggestions.
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Old 07-26-2010, 07:23 AM   #17
project_skyline
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This is just a tuning issue without a doubt. I can't remember if cobb has released the new firmware that has the starting tables like OS does.

What fuel are you running?
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Old 07-28-2010, 06:46 AM   #18
spyder5016
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pump gas (93 octane)
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Old 07-28-2010, 07:24 AM   #19
jaxscuby
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what were the injectors scaled too?
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Old 07-29-2010, 10:18 PM   #20
spyder5016
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not sure. But, I am using DW 850cc injectors. I will be speaking with the tuner next week and can ask him.
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Old 07-30-2010, 01:09 AM   #21
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I have some startup issues as well. Sometimes it fires right up, sometimes it cranks quite a bit. I strongly suspect the problem is related to fuel pressure - specifically, the one-way valve in the pump - but I won't know for sure until I try replacing it.

The cranking pulse width tables definitely need to be scaled down. If that's been done, and the startup problem remains, then I suspect a fuel pressure problem.
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Old 07-30-2010, 01:51 PM   #22
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Since you put a new fuel pump in, could it be that it isn't sealed properly. It seems to be a common issue.
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Old 07-31-2010, 08:36 AM   #23
spyder5016
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but the car seems to crank fine in the mornings when it has been sitting for a while. I'm not sure exactly what the problem is. I think it could be many things. I definitely want to narrow it down though. Either way, the car always ends up starting. It never fails to start. It just takes me hitting the gas pedal a couple of times and then it goes.
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Old 07-31-2010, 11:37 AM   #24
kasra007
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struggle to start as in does it crank or no?
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Old 07-31-2010, 06:31 PM   #25
spyder5016
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it always starts. however, it would crank, crank, crank and then start after putting my foot on the gas for a few times. It always starts, but it struggles doing so. In the morning or after work (when the car has sat there for a long time), the car always starts with very little struggle.

However, if I go out to restaurant for an hour and come back out to start the car, it struggles then. If I don't hit the gas, it will struggle even more to start.
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