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Old 08-10-2008, 09:48 PM   #1
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04 GT hard start

Ive got a friends automatic 04 GT Ive been messing with for a long time. It has a hard start problem that happens everytime after filling up and the next few starts after that untill the fuel level is down some. Any thoughts on this? Things like tune up, fuel filter, pump, iac, etc can be rule out as they have been replaced. Ive heard on another board about the "horrible evap problem" but no one went into detail of what that problem is. I made note of what FTP and FTPv is while it was starting ok. I wonder if its a pressure sensor or something else down the line in the evap system, but, I also havent replaced the fuel cap. Thoughts?
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Old 08-11-2008, 08:11 AM   #2
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Re: 04 GT hard start

one test to try would be to fill up and let it sit for a few minutes before cranking to see if it makes a difference. If it does it could be something as simple as trash getting stirred up in the tank and messing with the filter~ but I doubt that one. Is the fuel pressure good?
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Old 08-11-2008, 09:01 AM   #3
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Re: 04 GT hard start

Ive got like 40-42 pounds at an idle, atleast when its not acting up. There shouldnt be anything in the tank, I steamed it out when I pulled it to put a new pump in, and I also replaced the filter then. Seems like nothing Ive done has even started to touch it.
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Old 08-11-2008, 10:06 AM   #4
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Re: 04 GT hard start

there is a check valve that keeps pressure up or something in the line for starting~ I know when 03/04 cobra guys turn this off (it causes a hesitation in shifting at high rpms) it makes the car harder to start~ thats about the only other thing I know of that might cause the issue, its a switch or something on the pump that can be turned on/off
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Old 08-11-2008, 11:10 AM   #5
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Re: 04 GT hard start

Where is that located?
How do you shut it off?
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Old 08-11-2008, 11:55 AM   #6
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Re: 04 GT hard start

it is a check valve in the fuel pump assembly in the tank, you have to remove the intank lines and use a non-deteriorating rubber hose to replace it.
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Old 08-12-2008, 06:06 AM   #7
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Re: 04 GT hard start

Well, I really dont think thats what the problem is since this isnt an intermittent problem. It will do it every time after filling and the next couple starts after that. Besides, the cobra fuel pump setups are different than the GTs arent they?
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Old 08-13-2008, 12:58 AM   #8
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Re: 04 GT hard start

Describe your 'hard start' does it crank a lot? does it crank slow? does it start then hesitate/stumble?


Hard to diagnose this type of problem without seeing how it acts first hand
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Old 08-13-2008, 05:53 AM   #9
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Re: 04 GT hard start

It cranks fast enough, but its an extended period of time. When it does start, sometimes it will die, but if you hit the key again, it will fire right up and be fine. If it does the extended crank and does start, it stumbles around quite a bit untill it gets itself going.
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Old 08-13-2008, 07:34 AM   #10
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Re: 04 GT hard start

try cycling the key a few time next time you fill up and start it, if that works fine, you are having a priming issue that can be cause by a failing pump.
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Old 08-13-2008, 09:15 AM   #11
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Re: 04 GT hard start

I know its not a low fuel pressure problem, we had a gauge on it while it was acting up and didnt see a problem, plus its got a new motorcraft pump in it because the sender went out a while back.
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Old 08-13-2008, 09:58 AM   #12
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Re: 04 GT hard start

May be gas getting into the canister? when you fill up to you top off?
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Old 08-13-2008, 10:21 AM   #13
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Re: 04 GT hard start

that is possible, has it had ethanol in it by chance?
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Old 08-13-2008, 10:32 AM   #14
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Re: 04 GT hard start

She always runs 87 octane from Quick Trip which as far as I know is ethenol free, although I think almost every gas company can put up to 10% in without labeling. As far as I know she fills it till it clicks and stops. Far as checking the canister for gas, its up under the right fender isnt it? If thats the case, whats the cause of it happening?
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Old 08-13-2008, 11:23 AM   #15
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Re: 04 GT hard start

Quote:
Originally Posted by 4.6fox View Post
She always runs 87 octane from Quick Trip which as far as I know is ethenol free, although I think almost every gas company can put up to 10% in without labeling. As far as I know she fills it till it clicks and stops. Far as checking the canister for gas, its up under the right fender isnt it? If thats the case, whats the cause of it happening?
overfilling could put gas in the canister vent tube. may cause hesatation. i know thats the case in Nissans not sure about fords.
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