Exactly WHY is my car hard to start when warm?
#328160
05/25/09 12:39 PM
05/25/09 12:39 PM
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Joined: Jan 2003
Posts: 1,978 Southaven, MS
BossRide
OP
top fuel
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OP
top fuel
Joined: Jan 2003
Posts: 1,978
Southaven, MS
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I've asked around and all my friends say it's "just how it is." I am having trouble believing that Mopars rolled off the showroom floors with a hard starting condition.
Cold- Turn the key, push the pedal to the floor to set the choke, Boom! Starts right up.
Runs good, drives nice... pull in and park... go to leave and either it fires right off if less than, say 15 minutes has passed, or it spins over and over and finally catches.
Trial and error of different procedures (pumping the gas, not touching the gas, giving it full throttle or partial throttle) is basically all the same.
Fresh 360... tuned up... (good plugs, wires, cap, etc..) new fuel tank, filter, and pump, 600cfm Holley carb with electric choke, timing on the money... what is the secret? Any thoughts on what to check or how to remedy?
Does YOURS fire right off when warm?
The Blue Goose
My instagram: Bossride
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Re: Exactly WHY is my car hard to start when warm?
[Re: BossRide]
#328161
05/25/09 12:44 PM
05/25/09 12:44 PM
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Joined: Jan 2004
Posts: 357 The Garden State
LimelightCuda
enthusiast
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enthusiast
Joined: Jan 2004
Posts: 357
The Garden State
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My slant six equipped Scamp does the same thing. I think it is due to it boiling the fuel when it sits after it is fully warmed up but I'm not sure. My Barracuda with a 440 does not have this problem. My former Barracuda with a 318, which I had many years ago, would start up with a flick of the ignition switch, you didn't even have to give it any gas or even get in the car if it was warmed up.
Phil
1970 Barracuda Gran Coupe 1970 A66 Challenger Convertible
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Re: Exactly WHY is my car hard to start when warm?
[Re: LimelightCuda]
#328162
05/25/09 01:04 PM
05/25/09 01:04 PM
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Joined: Nov 2003
Posts: 3,577 Long Island, NY USA
BergmanAutoCraft
master
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master
Joined: Nov 2003
Posts: 3,577
Long Island, NY USA
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Couple reasons. First, fuel boils at 100 deg F. This was not so back in the day. The only place fuel usually boils is in the bowls, because here it is not under pressure. During heat soak, the fuel evaporates, and sometimes pushes out of the bowls into the motor, causing a flooding condition momentarily. The extended cranking is to refill the bowls. I have found wood spacers, and a cool running motor to comat this pretty well. I am also a proponent of electric fans, which keep good airflow over the motor at low speeds.
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Re: Exactly WHY is my car hard to start when warm?
[Re: 71valiant]
#328164
05/25/09 01:47 PM
05/25/09 01:47 PM
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Joined: Apr 2007
Posts: 2,327 Glendale, AZ
69L78Nova
Banned. Forever.
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Banned. Forever.
Joined: Apr 2007
Posts: 2,327
Glendale, AZ
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All my stuff starts within 1-2 seconds, whether hot or cold
1969 Nova 454/M21/3.31 Mild mid-11 second weekend cruiser
1994 F150 XLT Super Cab 2WD 5.0/4R70W/3.55 (Daily driver)
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Re: Exactly WHY is my car hard to start when warm?
[Re: 69L78Nova]
#328166
05/25/09 01:55 PM
05/25/09 01:55 PM
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Joined: Nov 2008
Posts: 1,565 tennessee
pushbutton
pro stock
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pro stock
Joined: Nov 2008
Posts: 1,565
tennessee
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Quote:
All my stuff starts within 1-2 seconds, whether hot or cold
Man thats fast! Wish my stuff would start that quick.
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Re: Exactly WHY is my car hard to start when warm?
[Re: SomeCarGuy]
#328168
05/25/09 02:52 PM
05/25/09 02:52 PM
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Joined: Nov 2003
Posts: 36,040 Lincoln Nebraska
RapidRobert
Circle Track
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Circle Track
Joined: Nov 2003
Posts: 36,040
Lincoln Nebraska
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k.i.s.s. next time BEFORE you crank it see if there's an A/P shot then pull the coil to dist wire & hold it 1/4" from ground & have someone crank it.
live every 24 hour block of time like it's your last day on earth
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Re: Exactly WHY is my car hard to start when warm?
[Re: SomeCarGuy]
#328169
05/25/09 06:23 PM
05/25/09 06:23 PM
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Joined: Jan 2003
Posts: 1,978 Southaven, MS
BossRide
OP
top fuel
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OP
top fuel
Joined: Jan 2003
Posts: 1,978
Southaven, MS
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Quote:
Mine starts fast, I have aluminum intake, heat riser blocked. Eddy carb. No spacer, just two gaskets.
Is your timing chain tight?
I have an Offy aluminum intake, and the timing chain should be tight, the motor has around 5,000 miles on it since the rebuild.
The Blue Goose
My instagram: Bossride
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Re: Exactly WHY is my car hard to start when warm?
[Re: 68Bullit]
#328175
05/26/09 12:20 AM
05/26/09 12:20 AM
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Joined: Feb 2003
Posts: 21,318 Manitoba, Canada
DaytonaTurbo
Too Many Posts
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Too Many Posts
Joined: Feb 2003
Posts: 21,318
Manitoba, Canada
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Quote:
Mine did the same thing, and recently I put a wooden spacer there to help. It helped out some, but not much. Even with the wooden spacer the carb is too hot to the touch once the engine is up to temp. No heat riser or anything. I'm thinking about using some fuel line insulation next to see if that will help. My fuel line runs cloe to the header on the passenger side, and is routed up very close to the front of the engine block before it ties into the carb.
If your fuel is boiling out like that your best bet is to just switch to an electric fuel pump with a return style regulator. That way when you turn your key to 'run' and the pump kicks on it fills up your carb bowls and the return style regulator keeps the fuel in the lines cooler plus stops the pump from overflowing your carb and pushing fuel past the needle/seat.
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Re: Exactly WHY is my car hard to start when warm?
[Re: BergmanAutoCraft]
#328176
05/26/09 12:22 AM
05/26/09 12:22 AM
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Joined: Feb 2003
Posts: 21,318 Manitoba, Canada
DaytonaTurbo
Too Many Posts
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Too Many Posts
Joined: Feb 2003
Posts: 21,318
Manitoba, Canada
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Quote:
During heat soak, the fuel evaporates, and sometimes pushes out of the bowls into the motor, causing a flooding condition momentarily.
How would this happen? Would not the evaporating/boiling fuel simply vent out of the bowl vent tubes?
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