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Replacing a fuel ijnector

Need schematic and directions for replacing a bad injector

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I have Chevy Equinox 2008, I replaced injectors rrecently, I have just some notes:
-Some times you just need to replace injector filter (a small cone)
-Take Care of washer when you plced back the injector put some Engine oil around it
- take Care of lables for Injector wire for the right place if there are no lables put them by your self befor disconnecting injectors

Posted on Oct 15, 2012


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Hard starting

This problem can be hard to track down , it could be caused by several thing's ! A bad check valve in the fuel pump letting fuel drain back into the tank , not keeping fuel line pressure up , a crankshaft position sensor can also cause this as well as an ignition control module !
DEFINITION: Engine cranks OK, but does not start for a long time. Does eventually run, or may start but immediately dies.
Refer to Important Preliminary Checks Before Starting in Symptoms - Engine Controls .

Inspect the powertrain control module (PCM) grounds for being clean, tight, and in the proper locations. Refer to Engine Controls Schematics .

Search for bulletins.

Test the engine coolant temperature (ECT) sensor for being shifted in value. Connect a scan tool. Compare the engine coolant temperature against the intake air temperature (IAT) on a cold engine. The ECT and IAT sensor values should be within ?± 3?°C (5?°F) of each other. If the ECT sensor is out of range with the IAT sensor, check the resistance of the ECT sensor. Refer to Temperature Versus Resistance for resistance specifications. Replace the ECT sensor if the resistance is not within the specification. If the sensor is within the specification, repair the ECT signal circuit for high resistance.

Inspect the mass air flow (MAF) sensor installation. A MAF sensor that is incorrectly installed may cause a hard start. Important: The embossed arrows on the MAF sensor indicate the direction of the intake air flow. The arrows must point toward the engine. Install the MAF in the proper direction. Refer to Mass Airflow Sensor/Intake Air Temperature Sensor Replacement .

Inspect the camshaft position (CMP) sensor for proper mounting and/or a bad connection. A long crank time occurs if the PCM does not receive a CMP signal.

Fuel System
Inspect the fuel pump relay operation. The fuel pump should turn ON for 2 seconds when you turn ON the ignition. Refer to Fuel Pump Electrical Circuit Diagnosis .

A faulty in-tank fuel pump check valve allows the fuel in the lines to drain back to the tank after the engine stops. Refer to Fuel System Diagnosis .

Inspect both injector fuses for being open. An open injector fuse causes four injectors and four ignition coils not to operate. Replace the fuse. Inspect the injector circuits and the ignition coil circuits for an intermittent short to ground.

Inspect for incorrect fuel pressure. Refer to Fuel System Diagnosis .

Inspect for a restricted fuel filter. Refer to Fuel System Diagnosis .

Inspect for a contaminated fuel condition. Refer to Alcohol/Contaminants-in-Fuel Diagnosis .

Ignition System
Test both injector fuses for being open. An open injector fuse causes four ignition coils and four injectors not to operate. Replace the fuse. Inspect the ignition coil circuits and the injector circuits for an intermittent short to ground.

Inspect for proper ignition voltage output with J 26792 Spark Tester. Refer to Electronic Ignition (EI) System Diagnosis .

Remove the spark plugs and check for the following:

Correct heat range

Wet plugs



Improper gap

Burned electrodes

Heavy deposits

Refer to Spark Plug Inspection in Engine Electrical.
Determine the cause of the fouling before replacing the spark plugs if the spark plugs are gas, coolant, or oil fouled. Refer to DTC P0172 or P0175 for diagnosis of the rich condition. Refer to Spark Plug Inspection in Engine Electrical for diagnosis of coolant or oil fouled spark plugs.

Inspect for bare or shorted ignition wires.

Inspect for loose ignition coil grounds. Refer to Electronic Ignition (EI) System Diagnosis .

Jul 14, 2015 | 2002 GMC Sierra 1500

2 Answers

Replace fuel injectors

Disconnect the battery. Ground the Injector circuit to discharge any stored energy. disconnect and remove the injector rail which should pull the injectors from the intake then remove the retaining clip on each injector to be replaced and replace them one at a time and reverse the process to put everything back. If you need further directions on removing the individual injectors I highly recommend the Haynes repair manual on your vehicle.

Nov 27, 2011 | Cars & Trucks

1 Answer

Need a fuel injector schematic for a 1988 maxima

BBB Industries should list schematics back to 1986.

Apr 06, 2017 | 1988 Nissan Maxima

1 Answer

One fuel injector is not shooting out gas. new fuel injectors, new fuel pump, new fuel fitler,fuses ok, and relay are okay. so what is the problem/

either the wiring between the injector and the computer is bad, or the computer is bad. (ecm) the RED wire on both injectors should have 12V. connect a test light to the positive of the battery, now connect the tip to the DARK GREEN wire or the DARK BLUE wire on the injectors. you should get a rythmic flicker at the light when cranking the engine.. if both wires flicker, the injector thats not flowing fuel could be bad. if 1 does not flicker, check the wire to the computer, those wires go directly to the computer, no connectors. if the wiring is good, I suspect the computer is bad.

Sep 08, 2011 | 1991 Chevrolet Caprice

1 Answer

What are the advantages of using an injector car compared to carburettors? Is the injector better than carburettor?

Injectors are better!
Fuel injected engine is..........
  • More fuel efficient
  • Don't need to mix air & fuel manually.
  • Works in any altitude.
  • Faster distribution of air/fuel to the combustion.
  • Maintenance free( multiple fuel filters ).
Now a days all cars are electronically controlled fuel injectors, 50 years ago they use mechanical ijnectors.
Info on carb uses are other way around of the injectors.
More info will be in this site

Hope FixYa helped you out!

Aug 23, 2011 | 2006 Peugeot 505

2 Answers

Engine light on. Scanner shows code P0172. What is the problem?

Overly rich fuel ratio, this is usually an issue with a leaking injector or unusually high fuel pressure which can be caused by a damaged fuel regulator.

May 31, 2011 | Ford Taurus Cars & Trucks

2 Answers

Have a 2001 ford f250 super duty need to know how to check fuel injectors......truck was running fine and then the enine ran real rough and when you push the gas pedal to the floor there is little...

The fuel injectors have a resistance of between 10 to 18 ohms.Test each injector. If any of the injector readings are higher or lower than they should be, you need to replace them.
For more troubleshooting:---

Put a long screwdriver directly on the injector while the car is running. Hold the handle up to your ear. You should be able to hear a rhythmic clicking sound. If you do, your injector is good. Hearing a clunk-clunk type noise means you have found your problem. Hearing silence or unusual clicking patterns means either the injector, wires or plunger may be bad or sticking. You will either have to clean or replace them.

---------- To know more about fuel injectors and troubleshooting.Please click on the link below:---


Many a times you get black smoke from exhaust due to faulty injectors.Check fuel injectors. Leaking injectors create an overly rich air/fuel mixture and cause black smoke. Take the valve cover off and look at the exhaust part of the injector, when it is running. Each time the injector fires, you should see oil exhausting from it. If you see oil coming out, then the injector is good. When replacing a bad injector, take the glow plug out and crank the engine to get any oil out of the cylinder.----------------- This should help.Thank you.

Jan 25, 2011 | 2001 Ford F250 Super Duty Super Cab

1 Answer

I have a 1992 acura legend it's been sitting up for about three years replaced the fuel pump, fuel filter, spark plugs, injector resistor, ran compression check on all cyl. all above 150 psi. swapped ign....

Put a meter on the firing and non firing side on the injectors and see if the reading is the same. Sometimes a whole bank of injectors loose the pulse to inject. If this is what is going on you need to check all the fuses, and look for wiring harness grounds on the engine near the injectors. A bad connection, or a bad fuse can shut down one side of the engine. It is also possible the engine computer has lost a driver, and is bad, this also can shut down a bank of injectors. Most of the time problems like this are caused by bad connections. If a quick check of these mentioned items doesn't help then get a good service manual with a wiring schematic in it and start checking out the wires to see if there is a break in the wires.

Dec 18, 2010 | 1991 Acura Legend

2 Answers

Can bad fuel injector damage spark plugs on a 2005 Ford Expedition? and if fuel injectors being replaced should less labor be needed for spark plug replacement?

A bad fuel injector can cause spark plug issues. If the injector does not supply enough fuel, the cylinder(s) without enough fuel will run hot, often damaging the spark plugs.

But your mechanic needs to make sure that the injector is the issue and not a fuel pressure issue from regulator, filter, or pump. Hopefully he/she has already done those checks.

As far as the labor cost being less the spark plugs wouldn't be removed during the fuel injector replacement. Even if they did, most mechanics won't cut the price. But if you are a regular customer it can't hurt to ask.

Jan 11, 2010 | 2005 Ford Expedition

1 Answer

Injectors not getting electrical power and not releasing fuel into the cylinders, hence no engine start

All pre 2008 powerstrokes use oil pressure supplied by a High Pressure Oil Pump(HPOP)to activate a plunger setup in the injector to inject fuel into the cylinders at 21 PSI. More than likely some of the HPOP components need to be replaced- i.e. valve, regulator, seal, feed tube...or the pump itself. I've replaced seals on these units since 2003, when Ford wanted to replace the pump and injectors. Did you notice a gradual increase in hard starting conditions? Do you have any visable oil leaks? Did you run the crankcase oil level down to below the add mark recently? All of these could be a factor. Ford wont tell you anything about a price because they dont like to do that before they do a diagnostic check on it and determine exactly how much needs to be fixed. Test alone will run around 100 buxs. If you are within warranty requisites then it wont matter and you likely wont be charged anything. If they crack into it have em fix as much as you can while theyre in there, because after warranty is out you are looking at a 3000 dollar repair bill from your friendly Ford dealer. Good luck...i hope this helps.

May 10, 2009 | 2005 Ford F 350 Super Duty

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