No start when hot problem after tune... - Ford Mustang Forums : Corral.net Mustang Forum
 
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post #1 of 7 Old 03-12-2016, 10:52 PM Thread Starter
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No start when hot problem after tune...

Hey guys need help, pulling my hair out. My 92 GT has a mild 306 with S-trim Vortech making 10psi. I have ford racing 42# injectors, 70mm throttle body, GT40 intake, Edelbrock aluminum heads, E-303 cam, etc. My problem is, after the car is driven and gets warm, it will not re-start without stepping on the gas pedal a little bit. It starts cold perfect, and runs great. Just won't start after its driven. It will just crank away for ever, until you put your foot on the gas pedal, and then it fires up. I've had it dyno tuned twice, and tuner is having trouble figuring it out. Any advice on how to fix this issue? Thank you.

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post #2 of 7 Old 03-12-2016, 11:25 PM Thread Starter
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I have checked me engine grounds, all are good. Also tried another coolant temp sensor, no change. Problem started happening when the 42#'s went in for the boost. I think it's an issue in the tune, anyone have any advice for my tuner?

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post #3 of 7 Old 03-13-2016, 09:43 AM
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Your tuner needs to pull out start up fuel. With the big injectors they are squirting in a ton of fuel and you are essentially flooding the engine. which is why it will only start with the gas to the floor, it tells the eec to shut the injectors off. I've got 42lb injectors and i had to pull a ton of start up fuel on mine through my PMS.

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TEA 205cc Twisted Wedge, FTI cam, Ported Victor 5.0, 5 lug disc conversion, ROH ZS wheels, Anderson PMS, 4.30
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post #4 of 7 Old 03-13-2016, 10:51 AM
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if you need to step on the air pedal, then you are lacking air.

as said, this could be a result of too much fuel, or too little air,,,,,,,,the iac is used on startup to allow the right amount of air.

89 GT gr-40, KB2200(10psi), tweecer R/T,LC-1, 22gal cell, w/tailpipes.
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post #5 of 7 Old 03-13-2016, 11:10 AM
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I've seen several cases where the diaphragm in the fuel pressure regulator leaks, and fuel travels through the vacuum line and into the intake. You shut the engine off, and a few minutes later, the intake is full of fuel. But if you let it sit long enough, the fuel has evaporated, so cold starts are normal.

Do an experiment. Before you turn the engine off, disconnect the vacuum line from the regulator and leave it off. Then wait as long as you normally would, and see it it starts normally.
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post #6 of 7 Old 03-14-2016, 12:11 PM Thread Starter
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Thank you guys, I will try the regulator trick and see if its leaking. If not, I'll have to bring it back to my tuner!
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post #7 of 7 Old 03-14-2016, 07:16 PM
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Quote:
Originally Posted by 89lxdave View Post
I've seen several cases where the diaphragm in the fuel pressure regulator leaks, and fuel travels through the vacuum line and into the intake. You shut the engine off, and a few minutes later, the intake is full of fuel. But if you let it sit long enough, the fuel has evaporated, so cold starts are normal.

Do an experiment. Before you turn the engine off, disconnect the vacuum line from the regulator and leave it off. Then wait as long as you normally would, and see it it starts normally.
Absolutely a great test...you may even see fuel in the vacuum line or port when you disconnect it.

Stepping on the gas while starting is actually programmed to kill the injectors if I'm not mistaken.

If you smell fuel on warm cranking and you have the gas pedal to the floor, something else (FPR) is flooding the motor.
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