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How do you know if you need fuel injectors on hummer h3 2007

How do you know if you ned fuel injector

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Posted on Jan 02, 2017

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SOURCE: fuel injector over fueling

all the injectors are supposed to constantly spray fuel when the car is runing,
but on the hard to start it might be a worn out fuel pump or
a leak on the fuel pressure regulator, unplug the vacium hose from the regulator and if there is any fuel at all then regulator is not good

Posted on May 29, 2008

  • 1010 Answers

SOURCE: changing fuel injectors

here is the answer,follow these steps one by one please: (1)relieve fuel pressure by using a fuel pressure gauge that also has a bleeder valve on it (2)disconnect the negative battery terminal (3)remove the intake manifold service cover (4)remove air intact duct between the air cleaner housing and the throttle body gasket.also remove the throttle body spacer bolts,remove the spacer and remove thegasket.discard the old gaskets. (5)Disconnect the fuel supply and return lines from the fuel rail. 960Disconnect the vacuum hose from the fuel pressure regulator. (6)Remove the nut that attaches the fuel rail end-point bracket retainer. (7)Disconnect the electrical connectors form all 8 fuel injectors and set the fuel injector harness aside. (8)Remove the fuel rail mounting bolts. (9)Remove the fuel rail and the fuel injectors as a single assembly. (10)Remove the fuel injectors one by one,by flipping up the U-clip retainer then pulling the injector from the fuel rail. (11)Remove the old O-rings from the injectors and be sure to use new ones when installing the new injectors. (12)Also use a new gasket when installing the spacer,also use a new throttle body gasket.>>when finished start car and check for leaks.and you're done.

Posted on Jun 23, 2008

  • 2004 Answers

SOURCE: Daewoo espero fuel injector

Try fuel injector cleaner. It is a solution/ solvent like that you pour into your fuel tank. It works perfectly well and great for cleaning that.

Good luck.

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Posted on Apr 27, 2009

  • 721 Answers

SOURCE: how to replace fuel injectors on 1990 chevy 1500 silverodeo

Ok, I'm assuming it's a T.B.I. Make sure the key is OFF!! Remove the air cleaner assembly.Or disconnect the battery altogether to be safe.Open the gas cap. Use a 20mm on the main fuel line to the throttle body ( the biggest line,usually driver's side), just hold that though, don't torque on it. At the same time use a 19mm on the nut going into the fitting you're holding with the 20mm. Crack the nut loose, using the 20mm to keep the larger nut from turning out of the throttle body. Remember, "righty tighty,lefty loosey". Just crack it loose until gas flows, btw you do this step with the engine cold & a rag under what your doing. This releaves the pressure that may be in the line. I just watch my eyes, but you may want goggles or a clear mask,I got 17+ years experience,so use proper caution if this is the first time. Ok,the fun begins, on top of the injector's (should have 2) grip the top of the plug & squeeze the clips ( with fingers!!) & pull off the one you want to replace. Most have 2 Torx screws holding them in. You need to buy a set if you don't have them. They look like a "star" & if they have a *** in the middle of them, then you need a tamper proof Torx set. Remove the ones from said injector(s) & remove the aluminum hold down piece. There's a name for it but I'm keeping this simple. Grab the injector you want to change & twist it from side to side while using upward pulling force. All this should be done by hand, but if neccessary, use pliers,gently to help out. Once it's out reverse the procedure. Be sure to use new o-rings where applicable or available & lube them with a little tranny fluid , oil, but no grease or thick stuff! When you're done re-assembling everything,leave the air cleaner off. Close the gas cap, turn the key on,don't start it yet, & look for leaks. No leaks,good to go. Leave the air cleaner off & hood open still & start it up. Re- check for leaks. No leaks then shut it off, put the air cleaner back on & you're done!! Now, keep in mind this system usually has a primary & secondary injector,some have the same on both sides. So make sure that's the problem. In 17 years haven't seen very many bad injectors period. It's usually something else. Hope this helps. Be safe! This is a pressurized fuel system, it will or should spay when you crack that line loose. If it doesn't you have a fuel pump issue or it sat overnight,which is ok. If you have a muti-port injection system,... man that would be so much to type. In that case I would buy a repair guide. That would be the same procedure,but with alot more to do.Good luck!

Posted on Jun 18, 2009

  • 1118 Answers

SOURCE: choosing fuel injectors for chevy 454

Go online to www.summit racing .com and i think you will find what your looking for, or call there tec line and talk to a real person (the phone number is 1-800-230-3030)

Posted on Jul 14, 2009

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You should hear the pump in the tank buzz on for a couple of seconds when you turn key to ON. It will come on and pressurize the lines, and then shut off if the computer doesn't get a cranking signal from the engine. Do you hear the hum or buzz from the gas tank? If so, pump is working alright. If no sound, then the pump has either failed, or the power to it has been interrupted.
If the pump is working, and you know the fuel filter is good, you should have fuel under pressure at the fuel rail on the engine. The only thing left for fuel to get into the cylinders, is for the injector circuit to work and pulse the injectors. Post back if you ned to test the injector circuit-very easy with a test light.
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Have you check the fuel system?

If you have spark getting to the spark plugs then it is possible that your fuel delivery is faulty.

Check that you got fuel at the main injector fuel rail.
If not then check that you have power supply to the fuel pump.

If you have power to the fuel pump then check that you have fuel getting to the fuel filter etc.

Let me know how you get on, if you ned more information.



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The fuel injector for these can be rebuilt. You can get the "nozzles" from Mercedes and then unscrew your injectors and replace the component inside. They come in little plastic containers and are very specific to your engine. Valve adjustment is very criticl on these engines and will affect performance profoundly. Let me know if you ned anything else or any maintenance tips or tricks.

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Wont crank it acts like it either isnt getting fuel or fire. Could it be a fuse issue ?

I doubt it's a fuse. Possibly the coolant temp sensor. Make sure you are getting fuel by pressing the fuel rail bleeder under the hood top of engine firewall side above injectors. ZGood Luck, Ned

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I have FORD F-250 96 Model Truck Engine is 5.8 When I started my car early morning, Engine is running Ok but after while when the engine become warm , the power of the engine become low and when I...

You should take it to a mechanic with a code scanner to determine the problem, as it could be so many things such as an O2 sensor, the mass air flow sensor, fuel pressure regulator, injectors, etc, etc, etc.....
And hunting and pecking (changing one part at a time) can be very costly and frustrating as a way of troubleshooting your problem.
You may even purchase an inexpensive code scanner yourself at your local auto parts store and decipher the meaning of the codes generated to figure out what is at fault yourself.
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