Friday, January 27, 2012

How to Remove CMFI Assembly on GMC Truck Sonoma?

See the details mentioned below :----


See Figures 1 and 2
The CMFI assembly is mounted to the lower intake manifold. The upper intake manifold assembly must be removed for access. The CMFI assembly includes a fuel meter body, gasket seal, fuel pressure regulator, fuel injector and six poppet nozzles with fuel tubes. Should a failure occur in any components of the CMFI unit, the entire assembly must be replaced.
  1. Remove the plastic cover and properly relieve the fuel system pressure.
  2. Disconnect the negative battery cable, then remove the air cleaner and air inlet duct.
  3. Unplug the wiring harness from the necessary upper intake components including:

    Throttle Position (TP) sensor
    Idle Air Control (IAC) motor
    Manifold Absolute Pressure (MAP) sensor
    Intake Manifold Tuning Valve (IMTV)
  4. Disconnect the throttle linkage from the upper intake manifold, then remove the ignition coil.
  5. Disconnect the PCV hose at the rear of the upper intake manifold, then tag and unplug the vacuum hoses from both the front and rear of the upper intake.
  6. Remove the upper intake manifold bolts and studs, making sure to note or mark the location of all studs to assure proper installation. Remove the upper intake manifold from the engine.

Click image to see an enlarged view
Fig. Fig. 1: Exploded view of the upper and lower intake manifolds and the CMFI system components
  1. Unplug the injector wiring harness connector at the CMFI assembly.
  2. Remove and discard the fuel fitting clip.
  3. Disconnect the fuel inlet and return tube and fitting assembly. Discard the old O-rings.
  4. Squeeze the poppet nozzle locktabs together while lifting each nozzle out of the casting socket. Once all six nozzles are released, carefully lift the CMFI assembly out of the casting.
To install:
  1. Align the CMFI assembly grommet with the casting grommet slots and push downward until it is seated in the bottom guide hole.

To reduce the risk of fire and personal injury, be ABSOLUTELY SURE that the poppet nozzles are firmly seated and locked into their casting sockets. An unlocked poppet nozzle could work loose from its socket resulting in a dangerous fuel leak.

  1. Carefully insert the poppet nozzles into the casting sockets. Make sure they are FIRMLY SEATED and locked into the casting sockets.
  2. Position new O-ring seals (lightly coated with clean engine oil), then connect the fuel inlet and return tube and fitting assembly.
  3. Install a new fuel fitting clip.
  4. Temporarily connect the negative battery cable, then pressurize the fuel system by cycling the ignition switch ON for 2 seconds, then OFF for 10 seconds and repeating, as necessary. Once the fuel system is pressurized, check for leaks.
  5. Disconnect the negative battery cable.

Click image to see an enlarged view
Fig. Fig. 2: Upper intake manifold torque sequence
  1. Position a new upper intake manifold gasket on the engine, making sure the green sealing lines are facing upward.
  2. Install the upper intake manifold being careful not to pinch the fuel injector wires between the manifolds.
  3. Install the manifold retainers, making sure the studs are properly positioned, then tighten them using the proper sequence to specifications. Refer toEngine and Engine Rebuilding of this repair guide for the manifold specification.
  4. Connect the PCV hose to the rear of the upper intake manifold and the vacuum hoses to both the front and rear of the manifold assembly.
  5. Connect the throttle linkage to the upper intake, then install the ignition coil.
  6. Attach the necessary wiring to the upper intake components including the TP sensor, IAC motor, MAP sensor and the IMTV.
  7. Install the plastic cover, the air cleaner and air inlet duct.
  8. Connect the negative battery cable.

See below latest solved car problems :------

Mazda MPV cranks but will not start?


Freightliner fl112 fuse box diagram?

Car will not turn the ignition to start?

Car only starts when gas pedal is pressed?

Hyundai coupe f2 hazard fault?

Where is the bulb located in glove box?

Additional wiring harness needs to be installed in a brake controller for electric brakes on 2012 Toyota Highlander?

Fail smog test due to gas filter hose?

Clutch squeaking under hood?

Replace door stay assemblies on Toyota?

Acceleration lag problem?

How to Replace rear quarter glass on Toyota Tacoma?

Overdrive light in the dash blinks?

How to bypass immobiliser on Rover 200?

Hood clear coat peeling off?

Engine stumbles coming off idle when warm?

How to Refit Rear seat on Rover 600?

How to replace the speakers on 2011 Ford Edge?

How to Remove Rear seat on Rover 600?

Toyota solara rattling in rear?

Parking light stay on constantly?

Engine hard to start after gas refill?

How to replace wheel bearing on Honda Civic?

Do snow tires go on the back or front?

Where is Key chip memory located on 2004 ford Freestar?

How to fill Brake line antifreeze on freightliner classic?

Orange O/D warning light flashing on dash?

GMC ENVOY spare tire system stopped working?

Car starts and cuts off immediately?

Where is ECM located on 1997 Ford Ranger?

Ford Pickup Alarm will not disengage?

Temperature gauge keeps fluctuating up and down close to red?

How to remove Chevy idler arm?



Loud rattle noise from right rear portion of the car?

Now Voltage at O2 sensor on 1996 Toyota Land Cruiser?

Bank 2 Sensor 1 Heater circuit Failure?

Left bank sensor running lean?

Rear view mirror fitting details for 2008 Toyota FJ Cruiser?

GPS not charging in car?

How to remove passenger side head rest on 2007 Toyota Avalon?

Where is OBD-II Connector located on the 2007 Lexus rx 400h?

Car cranks, then run for second and then quit?

How to replace Starter on Infiniti Q45?

Where is Radio Fuse located on 2007 Dodge charger?

Relearn Theft deterrent module?

Buick theft deterrent module Relearning?

2006 Ford Expedition radio not powering ON?

Ticking noise at the top end on Toyota Tundra?

Trunk button Not Working on Buick car?

EGR Hoses melting?

Location of Freeze Plug on 1998 Ford Expedition?

Car Engine Stalls While Driving?

O/D OFF light flashes on Ford Explorer?

Engine will not crank after relearning Theft deterrent module?

Problems with the rear defroster?


How to remove Front differential?

Chevy NAV disc slot Location?

No power due to weak turbo?

Before purchasing Second hand car?

Purchasing second hand Chevy Lumina?

Buying second hand 2007 Toyota Corolla sedan?

Testing mass air flow sensor?

Where is MAF sensor located on 2000 Ford Expedition?

Car won't start without hitting the gas pedal?

Ford Keyless Remote Fob Reprogramming?

1995 Oldsmobile Eighty Eight has bad O2 Sensor?

Dual Exhaust on 1996 Chevrolet camaro z28?

How to replace TDM module to Pro module wiring ?

4X4 Truck makes roaring noise in the front end?

Ford Freestyle second row seat will not fold?

Front struts installing are bit longer?

How to adjust rpm on 2009 dodge charger SRT8?

No power to the control side of the fuel pump relay?

Heater fan and headlights will not turn off with ignition off?

Car takes time to Crank and start?

Car jerks while going uphill and Check engine light is ON?

Car turns over, but only starts, if starter is jumped?


Service Engine Soon light stays on?

Gasoline around gas cap?

Cruise control not working?

Car will not run after resetting inertia switch on Mercury Mystique?

It sounds like a door is open or window is down on the rear passenger door of crew cab?

VAN emits whitish bluish smoke and bad fuel smell from exhaust

Car stalls and throws white smoke from exhaust?

Car cigarette lighter fuse blows out?

Car will not start security lock out?

After replacing glow plugs Truck will not start?


Car will not go into 4WD high or 4WD low?

Where is master cylinder located on Lexus RX 300?

Truck is hard to start and Emits smoke while starting?

Engine cuts out at 3000 RPM?

Car turns over but will not start, only makes clicking sound?

Catalytic Converter glowing hot?

After getting car washed, check engine light is ON and key less entry not working, tried reprogramming. Also car shows fuel pressure?

Fuel gauge jumps from empty to full?

Why airbag light flashes 7 times?

Passenger side Folding Mirror is not operating?

Very low air output on Chevrolet Trailblazer?

Complete loss of brake pedal then all gets normal?

Car sitting for year, now will not crank and go in gear?

After replacing battery, ignition not working?

Where is Fuse box located on 2002 Honda Accord?


How to reset Radio code after car battery is died?

How to open rear lift gate?

Car still runs Rough after tune up?

No 4x4 light on dash?

Car cranks, has spark but will not start?

Cylinder 6 Misfire?

Chevy s-10 blazer 4.3l Spark Plug Firing Order?

2008 Ford Ranger Shifter Knob Removal?

Erratic idle on car?

Car dies when gas pedal is pressed?

Low idle when cold out side?

MAF, IAT, MAP and Coolant Level Sensor problem all together on Mazda MPV?

GMC Engine Coolant Temperature (ECT) Sensor Replacing?

Coolant temperature sensor dies again and again?

GMC Idle Air Control (IAC) Valve Replacing?

Car Surging?

EVAP connecting hose to PCV valve Collapse?

How to replace a distributor on Chevrolet Camaro?

Cadillac Seville Digital Dash Display not working?

Can car radio code block Passkey anti theft system ?

Toyota Avalon Factory Alarm will go off?

Rear oil seal leaking?

Car water leak around the Starter area and Bell Housing?

Where are TPS and IAC Located on Ford Escort?

Front tires leaning IN?

Where is Vent fan located on Chevrolet Impala?

1982 dodge rampage Spark plugs Firing Order Diagram?

Engine Misfire codes on Chevrolet Malibu?

2006 Suzuki Forenza Spark plug Firing Order Diagram?

Chevrolet Tahoe Hood open warning on dash and alarm sounds?

How to wire new Radio on 1990 Toyota Celica?

Valve clearance details for Toyota 2.0 rav4?

Where is the EGR feedback sensor located on 2004 Ford Explorer ?

How to wire toggle switch to Push button on Chevrolet Camaro?

Emissions schematic Diagram For 1984 Chevy K10 silverado 305 engine

Radio Stereo Wiring Diagram for 1991 Chevy 1500?