Question about 1999 Ford Mustang Cobra

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Why engine start at wide open throttle? - 1999 Ford Mustang Cobra

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Binding throttle cable , dirty throttle body . binding throttle butterfly shaft.

Posted on Apr 03, 2015

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Posted on Jan 02, 2017

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Had a p305 on my 2005 buick rendezvous engine light is on changed the coil pack. it still hard to start unless i mashed the gas. it stalls at the light


Starting Mode
With the ignition switch in the ON position, before engaging the starter, the PCM energizes the fuel pump relay for 2 seconds allowing the fuel pump to build up pressure. The PCM first tests speed density, then switches to the mass air flow (MAF) sensor. The PCM also uses the engine coolant temperature (ECT), the throttle position (TP), and the manifold absolute pressure (MAP) sensors to determine the proper air/fuel ratio for starting. The PCM controls the amount of fuel delivered in the starting mode by changing the pulse width of the injectors. This is done by pulsing the injectors for very short times.
Clear Flood Mode
If the engine floods, clear the engine by pressing the accelerator pedal down to the floor and then crank the engine. When the throttle position (TP) sensor is at wide open throttle (WOT), the PCM reduces the injector pulse width in order to increase the air to fuel ratio. The PCM holds this injector rate as long as the throttle stays wide open and the engine speed is below a predetermined RPM. If the throttle is not held wide open, the PCM returns to the starting mode .
You could have a dirty or bad mass air flow sensor .
You could have

Mar 25, 2016 | Buick Rendezvous Cars & Trucks

1 Answer

Wide open throttle engine will not pick up rpm like bad ignition


On most vehicles there is a wide open throttle cut out switch or it is programmed into the PCM/ ECM . Kills injectors ! To find out if yours has it , try an start the vehicle with gas pedal held to the floor .

Jan 05, 2016 | Cars & Trucks

1 Answer

Throtle gets stuck wide open i did tps worked for a day always pump to start runs ruff then goes bamm gets stuck wide open help me


You should not need to pump the throttle. That does not have any effect on starting the engine on a fuel injected car.
How do you un-stick the throttle ?

Dec 29, 2015 | 1999 Cadillac DeVille

1 Answer

Diagram distributor


Wide open as in wide open throttle?? You mean the engine is racing? Something is wrong with the throttle controls, or the throttle valve in the carburetor may be sticking open. Look down the carb throat. At its base will be the throttle valves-"butterfly" valves just like the choke valve on top of carb. The throttle valve should be closed at rest, or at idle, or when gas pedal is not moved. Rotate the throttle lever on the carburetor by hand (when gas pedal is pressed down, the throttle is rotated). The throttle valve at the bottom of the carb should open and close with the throttle lever.
If the valve is sticking, spray some carburetor cleaner down it, and spray the outside clean, too. Work the throttle back and forth to make sure it is free to move.
For a high idle, have the carburetor adjusted. Timing should be checked, too-that can cause a high idle, but wouldn't cause it to go wide open.
Let us know what you find. Good luck.

Dec 07, 2013 | Ford Ranger Cars & Trucks

1 Answer

I have a 2000 Lincoln ls v8 3.9 it will only start when I hold the throttle wide open


A wide open throttle cuts off power to the fuel pump.
Is it possible one of the injectors is flooding the engine ?

Jan 28, 2013 | Cars & Trucks

1 Answer

I have a 1999 malibu it start and run for short time but them stop.if i started again them it dosent have any signal at the spark plug. it have been 2 days that this is goin up this mornig i started and...


map sensor control fuel delivery and ignition timing.the map sensor is your load sensor when engine closed throttle high vacuum wide open throttle low vacuum.need more fuel and spark.when your engine at wide open throttle. low vacuum.cause electrical volts to increase to 5 volts in which pcm will increase fuel pressure and spark.the map sensor does control spark also.replace map sensor erase code and see what happens.

Apr 16, 2011 | 1998 Chevrolet Malibu

1 Answer

Had 2 problems occur at same time after some repair. 1st. After repair started up an engine runs wide open with no throttle .Checked an cleaned T>P>S. an throttle body . Checked for vacume...


The only way an engine can run Wide open is if the throttle plate is opened all the way, allowing a large volume of air in to the engine. Check the throttle plate and see if it is hung up or possibly the throttle cable is frayed and holding the throttle open. It is not the injectors, they operate on inputs from the PCM.

Nov 13, 2010 | 1999 Jeep Grand Cherokee

1 Answer

When starting car engine will rev wide open.


check the throttle return spring, possibly broken or has come off

Jul 23, 2009 | 2001 Lincoln LS

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