At Fixya.com, our trusted experts are meticulously vetted and possess extensive experience in their respective fields. Backed by a community of knowledgeable professionals, our platform ensures that the solutions provided are thoroughly researched and validated.
How do gas getting into the intake on a 91 f350 7.5? I removed the throttle body housing and found gas just sitting in the valley. I checked and plugs were filled with gas.
- If you need clarification, ask it in the comment box above.
- Better answers use proper spelling and grammar.
- Provide details, support with references or personal experience.
Tell us some more! Your answer needs to include more details to help people.You can't post answers that contain an email address.Please enter a valid email address.The email address entered is already associated to an account.Login to postPlease use English characters only.
Tip: The max point reward for answering a question is 15.
To remove a fuel injector or injectors you must remove the fuel supply rail that sits over them. Here is how you do that for both engine options, Turbo and non Turbo..
Removal & Installation
Except Turbocharged Models
WARNING Release fuel system pressure before servicing fuel system components. Service vehicles in well ventilated areas and avoid ignition sources. Never smoke while servicing the vehicle. This may result in personal injury or *****.
Release fuel system pressure.
Remove the air cleaner lid, disconnect the inlet air temperature sensor and makeup air hose.
Remove the negative battery cable.
Remove the engine cover or throttle control shield if equipped.
NOTE Wrap shop towels around hose to catch any gasoline spillage.
Disconnect fuel supply tube from rail.
Remove the Intake Manifold, refer to the Engine section.
Disconnect electrical connectors from fuel injectors.
Remove bolts holding fuel rail.
Remove the fuel rail and injectors.
Remove the injectors from the fuel rail.
To install:
Install injectors to the fuel rail.
Apply a light coating of clean engine oil to the O-ring on the nozzle end of each injector.
Insert fuel injector nozzles into openings in intake manifold. Seat the injectors in place. Tighten fuel rail bolts to 170-230 inch lbs. (19.5-25.5 Nm).
Attach electrical connectors to fuel injectors.
Connect fuel supply tube to fuel rail. Refer to Quick Connect Fittings in the Fuel Delivery section
Install Intake Manifold, refer to the Engine section.
Install the engine cover or throttle control shield if equipped.
Install the negative battery cable.
Install the air cleaner lid, connect the inlet air temperature sensor and makeup air hose. Tighten air inlet tube clamps to 20-30 inch lbs. (2-4 Nm).
Turbocharged Models
WARNING Release fuel system pressure before servicing fuel system components. Service vehicles in well ventilated areas and avoid ignition sources. Never smoke while servicing the vehicle. This may result in personal injury or *****.
Release the fuel system pressure.
Disconnect the negative battery cable.
Disconnect the throttle body inlet hose and remove from throttle body.
Disconnect the purge hose from the throttle body.
Unlock and disconnect the electrical connection at the throttle body.
Remove the throttle control shield .
Remove the throttle and speed control cables from the throttle body.
Remove the cables from the throttle body bracket.
Unlock and disconnect the MAP sensor electrical connector.
Remove the vacuum lines from the rear of the intake manifold.
Remove the 5 bolts from the front of the intake manifold.
Remove the 2 bolts from the rear of the intake manifold.
Remove the intake manifold. Cover the lower intake manifold openings.
Drain the Coolant system.
Move the upper radiator hose clamp, so that the hose can be rotated up and out of the way.
Remove the 2 small hoses from the thermostat housing.
Remove the 2 bolts from the thermostat housing and rotate the assembly up and out of the way.
NOTE Wrap shop towels around hose to catch any gasoline spillage.
Disconnect the fuel line from the fuel rail.
Unlock and disconnect the electrical connectors from the fuel injectors.
Remove the wiring harness from the fuel rail.
Remove the 2 bolts from the fuel rail.
Remove the fuel rail and injectors from the intake manifold.
To install:
Install the fuel injectors to the fuel rail.
Apply a light coating of clean engine oil to the O-ring on the nozzle end of each injector.
Insert fuel injector nozzles into openings in intake manifold. Seat the injectors in place.
Install the 2 bolts to the fuel rail. Tighten fuel rail bolts to 170-230 inch lbs. (19.5-25.5 Nm).
Install the wiring harness to the fuel rail.
Connect and lock the electrical connectors to the fuel injectors.
Connect the fuel line to the fuel rail.
Rotate the assembly back into place and install the 2 bolts to the thermostat housing tighten to 110 inch lbs. (12.5 Nm).
Move the upper radiator house clamp back into place.
Install the 2 small hoses to the thermostat housing.
Fill the Coolant system.
Install the intake manifold.
Install the 2 bolts to the rear of the intake manifold tighten to 250 inch lbs. (28 Nm).
Install the 5 bolts to the front of the intake manifold and tighten to 250 inch lbs. (28 Nm).
Install the vacuum lines to the rear of the intake manifold.
Connect and lock the MAP sensor electrical connector.
Install the cables to the throttle body bracket.
Install the throttle and speed control cables to the throttle body.
Install the throttle control shield.
Connect and lock the electrical connections at the throttle body.
Connect the purge hose to the throttle body.
Connect the throttle body inlet hose to the throttle body and tighten clamps to 20-30 inch lbs. (2-4 Nm).
Connect the negative battery cable.
Use the DRB® scan tool ASD Fuel System Test to pressurize the fuel system. Check for leaks.
The thermostat is located inside the steel thermostat housing, which is located on the front of the engine right in front of the throttle body housing and halfway between the alternator and a/c compressor. Remove the air intake assembly and remove the front bracket connected to the front two bolts of the throttle body. Then remove the two main bolts of the thermo housing. Lift up the thermo housing and you will see the thermostat sitting there.
The thermostat is located in the thermostat housing which is located on the intake manifold under the throttle body. If you have small hands, you can remove the air intake tube from the throttle body and the exhaust crossover heat shield. Once there out of the way, you can remove one of the bolt and losses the other to slide the thermostat housing off to replace the thermostat.
If you can not get to the bolts, then your going to have to remove the throttle body and don't forget the order the new throttle body gasket also. Not that the coolant temperature sensor is on the intake manifold in front of the thermostat housing, so take caution not to damage it when removing the housing.
If the manifold was replaced, install or connect the following:
Vacuum source manifold.
Positive Crankcase Ventilation (PCV) valve.
Manifold Absolute Pressure (MAP) sensor.
Throttle body assembly.
Upper-to-lower intake manifold carrier gasket to the upper intake manifold.
Carefully place the upper intake manifold onto the lower intake manifold. Ensure that the alignment pins in the upper intake manifold align with the holes in the lower intake manifold.
NOTE: Apply thread lock compound, to the bolt threads before assembly.
Install or connect the following:
Upper intake manifold. Tighten the upper intake manifold bolts in sequence to 89 in lbs (10 Nm)
Accelerator and the cruise control cables with the bracket to the throttle body.
EVAP purge solenoid vacuum line to the throttle body.
Connect the electrical connectors to the following:
Mass Air Flow (MAF) sensor
Manifold Absolute Pressure (MAP) sensor
Idle Air Control (IAC) valve
Throttle Position (T/P) sensor
EVAP purge solenoid
Install or connect the following:
Throttle body upper support bracket bolt. Tighten the bolt to 89 in lbs (10 Nm)
EGR valve wiring harness heat shield, nut and the bolt. Tighten the nut and the bolt to 89 in lbs (10 Nm)
Before servicing the vehicle, refer to the Precautions section.
Relieve the fuel system pressure.
Drain the cooling system.
Remove or disconnect the following:
Negative battery cable
Supercharger
Thermostat housing
Exhaust Gas Recirculation (EGR) tube at the intake manifold
Engine Control Temperature (ECT) sensor
Intake manifold
To install:
Install or connect the following:
Intake manifold with new gaskets. Torque the bolts, working from
the center out, to 11 ft. lbs. (15 Nm).
ECT sensor connector
EGR tube to the intake manifold
Thermostat housing
Supercharger
Negative battery cable
Refill and bleed the cooling system.
Run the engine and check for leaks and proper engine operation.
VIN K Engine
Before servicing the vehicle, refer to the Precautions section.
Disconnect the negative battery cable.
Drain the cooling system.
Relieve the fuel system pressure.
Remove or disconnect the following:
Fuel injector sight shield
Air inlet duct
Spark plug wires from the right side
Manifold Absolute Pressure (MAP) sensor
Vacuum lines from the intake manifold
Fuel lines
Fuel injector electrical connectors
Fuel regulator vacuum line
Fuel rail from the intake manifold
Exhaust Gas Recirculation (EGR) heat shield
Throttle cable bracket from the cylinder head mounting bracket and
the throttle body cables
Throttle body support bracket
Upper intake plenum and gasket
Thermostat housing
Electrical connector from the Engine Coolant Temperature (ECT)
sensor
Drive belt tensioner assembly
EGR valve outlet pipe
Lower intake manifold
Fig. Exploded view of the intake manifold and related
components-3.8L (VIN K) engine
Install or connect the following:
Intake manifold using new manifold gaskets. Torque the bolts in
sequence to 11 ft. lbs. (15 Nm); then, re-torque to 11 ft. lbs. (15 Nm).
EGR valve outlet pipe
Drive belt tensioner assembly. Torque the tensioner bolts to 37
ft. lbs. (50 Nm).
Electrical connector to the ECT sensor
Thermostat housing
Upper intake plenum. Torque the intake plenum bolts to 88 inch.
lbs. (10 Nm).
Throttle body support bracket
Throttle cable bracket to the cylinder head mounting bracket and
the cables to the throttle body lever
EGR heat shield
Fuel rail. Torque the fuel rail bolts to 88 inch. lbs. (10 Nm).
Fuel lines
Fuel regulator vacuum line
Fuel injector electrical connectors
Vacuum lines to the intake manifold
MAP sensor
Spark plug wires
Fuel injector sight shield and air inlet duct
Negative battery cable
Refill and bleed the cooling system.
Run the engine and check for leaks and proper engine operation.
the engine management system is trying to find correct idle speed/no fuel (when you take your foot of the gas above 850 rpm no fuel goes into the engine.help economy/egr system to burn off.try using a higher/lowe octane fuel to see if any change occurs.also try a gas treatment like unwins/redexe
DETACH CABLE FROM THROTTLE LINKAGE..MOVE CABLE IN AND OUT OF CABLE HOUSING..IF IT MOVES FREELY,YOUR PROBLEM IS MOST LIKELY IN THROTTLE BODY/PLATE..YOU CAN REMOVE THROTTLE BODY..FIRST REMOVE AIR CLEANER,UNPLUG TPS,IDLE MOTOR AND INTAKE TEMP SENSOR..USE BRAKE CLEANER OR THROTTLE BODY CLEANER AVAILABLE AUTO PARTS STORES..DO NOT LET AND CLEANER GET IN TPS..YOU CAN USE A PLASTIC OR WOOD SCRAPER..SO YOU DON'T SCRATCH THROTTLE BORE AND CLEAN DEPOSITS FROM THROTTLE BODY/PLATE..HAVE SEEN THIS CAUSE STICKING OF GAS PEDAL..I HOPE THIS HELPS..WHEN DONE CLEANING,REINSTALL THROTTLE BODY AND RELATED PARTS
Yes, that sensor could cause that symptom.
Cleaned everything first?
Part is around $50 I think, used obviously cheaper. Try removing the cable going to the sensor, this usually forces the computer to a default setting. If your performance improves you found your culprit. It also never hurts to clean the throttle body and air intake. Are there any codes getting set by the onboard computer? Part house can help you there.
×