Trouble starting when hot after F.I install
#1
Trouble starting when hot after F.I install
Here's what I'm running:
2006 350z roadster
Vortech v3sci supercharger
Deatschwerks 600cc injectors
Walbro gss342 fuel pump
Uprev Osiris tuner
Here's the story, I just installed all of the above parts on the car and it was tuned on a dyno making 390whp, idles fine, runs fine through all rpm ranges, everything is perfect
The problem: when I attempt to start the car when it's hot or at normal operating temps I have to put my foot on the gas to start it, if I don't touch the gas it will just crank over and not start. When it's cold it starts perfect without an issue. This was never a problem until after I did the FI install.
I had my tuner look into it but he can't figure it out. He isn't 100% familiar with uprev either so that could be a bit of the problem.
Has anyone had this problem? I'm thinking it's definitely a tuning issue.
2006 350z roadster
Vortech v3sci supercharger
Deatschwerks 600cc injectors
Walbro gss342 fuel pump
Uprev Osiris tuner
Here's the story, I just installed all of the above parts on the car and it was tuned on a dyno making 390whp, idles fine, runs fine through all rpm ranges, everything is perfect
The problem: when I attempt to start the car when it's hot or at normal operating temps I have to put my foot on the gas to start it, if I don't touch the gas it will just crank over and not start. When it's cold it starts perfect without an issue. This was never a problem until after I did the FI install.
I had my tuner look into it but he can't figure it out. He isn't 100% familiar with uprev either so that could be a bit of the problem.
Has anyone had this problem? I'm thinking it's definitely a tuning issue.
#7
Registered User
iTrader: (1)
It's actually a little more than that. Check out the uprev DIY thread where I posted all my tables. There's like 3 or 4 tables/columns for enrichment (can't remember, it's been almost 2 years since I messed with my tune) that has to be changed for the larger injectors (I explained it in the thread). Increasing the timing doesn't hurt either.
Last edited by djamps; 08-01-2014 at 02:03 PM.
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#9
New Member
iTrader: (7)
It's actually a little more than that. Check out the uprev DIY thread where I posted all my tables. There's like 3 or 4 tables/columns for enrichment (can't remember, it's been almost 2 years since I messed with my tune) that has to be changed for the larger injectors (I explained it in the thread). Increasing the timing doesn't hurt either.
edit: thats right forgot about injector priming pulse!
Last edited by jdm-v35; 08-01-2014 at 10:30 PM.
#10
New Member
iTrader: (11)
the reason its starting when you push on the gas, is that you are allowing more air in and and leaning it out. You are too rich. pull fuel from the cranking tables at that appropriate coolant temps.
No need to mess with cranking timing at all.
hot start issues are easy to fix. If you press the gas pedal and it start, pull fuel. If you press the pedal and it still doesnt start of backfires, add more fuel.
No need to mess with cranking timing at all.
hot start issues are easy to fix. If you press the gas pedal and it start, pull fuel. If you press the pedal and it still doesnt start of backfires, add more fuel.
#11
New Member
iTrader: (5)
I too have intermittent hot starting issues....... As I can't tune a FM radio station........I've wondered if the car being tuned during winter in the Midwest might have something to do with my starting troubles down here in 105 degree weather with an engine bay much MUCH hotter than that?
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