fuel injector problems?

2005 CHEVROLET SILVERADO
65,000 MILES • V8 • 4WD • AUTOMATIC
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KDOG05
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About a month ago while driving on the freeway the engine light came on, and engine started to act funny. If i tried to give it gas to quickly it wouldn't respond, but if i did it slowly ti did ok. Eventually after about two days of driving it carefully the engine started to run better, and the engine light went off. Since then i have had the engine light come on several times and get progressivly worse, and have noticed it that the light tends to come on if i hot rod it a little, then same thing happens a couple days later of taking it easy the light goes off. I did have a chip on it and thought that was causing it so i unhooked it, and about three days later i was driving normall and the light came on then the truck had no throttle response and sounds like its knocking realy hard it only idles and if you give it gas it has no response. I got a tester and it came up with three codes:
1: Fuel pump relay circuit malfunction injectors
2,3,5,8.
2: Fuel rail pressure range/perfromance
3: fuel injector 2 control circuit malfunction
I replaced the fuel pump relay under the hood fuse block and the engine still runs poorly. while the motor is running and i pull off the electrical connector on cylinders 2, 3, 5, and 8 one at a time nothing happens
if i pull off cylinder 1, 4, 6, or 7 one at a time the motor dies the second i pull it off. (not sure what this meens but tried it anyways). I don't think it's the injectors and the rely is fine any suggestions would be appreciated
Nov 3, 2009 at 7:50 PM
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JDL
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Welcome to the forum, Voltage to injector is pink wire, goes hot when you turn on the key. The other wire whatever the color is ground. You can use a noid lite on injector plug, engine cranking, the lite should pulse.
Nov 4, 2009 at 12:20 PM
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KDOG05
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I have tested each injector wire with a noid lite with key in the on position or while motor is running i have no voltage present on any wire what does this mean?
Nov 4, 2009 at 6:54 PM
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JDL
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Did you use a testlite on the pink wire to check for voltage. Ground the testlite to the engine block. If no voltage, there is an injector fuse for each bank.
Nov 5, 2009 at 8:23 AM
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KDOG05
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I finally fixed the problem apparently 0n the 05 duramax it is a common problem for the injector harnesses to go bad on cylinders 2 and 7. The dealer sells a kit with new harnesses and some heat shrink butt splices for $250 it took me 30 min to change out harnesses, and the truck runs perfect. Thanks.
Nov 13, 2009 at 7:14 PM
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JDL
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Glad you got it going your way.
Nov 14, 2009 at 8:19 AM
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CHAMPIONENT
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I have three injectors bad in a Duramax Diesel engine. I was wondering if you have the literature on how to replace them.
Aug 21, 2020 at 9:38 AM (Merged)
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BRIAN 1
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Remove the lower valve coverRemove the fuel injector return line from fuel injectors.
Remove the bolt from the fuel injector bracket.
Remove the fuel injector(s).
Remove the copper compression washer from the injector hole if the washer was not removed with the injector,you also need a special tool to remove the injector(s).it may sound easy but there not.without the special tool to remove the inj you will break the inj.doing these injectors are NO FUN!alot of work remving the lower v/c.
Aug 21, 2020 at 9:38 AM (Merged)
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EMD014
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I have a 2002 Chevy silverado 1500 HD 6.0L. The injectors are not pulsing when the engine is turned over, but they do have power when the key is turned on.
Aug 21, 2020 at 9:38 AM (Merged)
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JDL
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One possibility is your security system?

Engine cranking, do you have spark at the plugs? Even with coil-on-plugs, you can still check for spark.
Aug 21, 2020 at 9:38 AM (Merged)
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EMD014
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I haven't thought about the security system, I do have spark at all plugs, i was thinking crank sensor, cam position sensor, or pcm. I replaced the pcm (I did have it flashed / programmed to my VIN number) The crank sensor ohmed good, but I can't find the cam sensor. How would i check the security system?
Aug 21, 2020 at 9:38 AM (Merged)
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JDL
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When you try to start, is the security lite on? If so, leave the key in the on position, it will return to on from crank. Watch the security lite, it should go off in about 10 minutes. If the lite does go out, turn the key to off for 5 seconds, then try to start.

At the moment, I don't think your cam sensor is the problem? It should be located at rear center of engine. The wire colors at the connector are in the diagram.
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Aug 21, 2020 at 9:38 AM (Merged)
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EMD014
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The fuel injectors on my 2002 chevy silverado HD only pulse once when i turn the engine over, no matter how long it turns over. Any idea what could cause this?
Aug 21, 2020 at 9:38 AM (Merged)
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WRENCHTECH
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Is your spark doing the same thing?
Aug 21, 2020 at 9:38 AM (Merged)
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EMD014
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no, the spark is fine, it's a good strong spark too
Aug 21, 2020 at 9:38 AM (Merged)
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WRENCHTECH
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Have you determined if it's the ground pulse dropping out or the power supply?
Aug 21, 2020 at 9:38 AM (Merged)
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EMD014
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Hey, I apologize, my internet has been down, but I have been doing some more testing and realized that my spark plugs are doing the same thing, pulsing once, and then quitting, no matter how long i turn the engine over
Aug 21, 2020 at 9:38 AM (Merged)
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WRENCHTECH
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Sounds like possible bad Crankshaft Position sensor but that should be confirmed independently.
Aug 21, 2020 at 9:38 AM (Merged)
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EMD014
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Is there a way to check this sensor?
Aug 21, 2020 at 9:38 AM (Merged)
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WRENCHTECH
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Yes, but you need a portable lab scope to observe the wave patterns.
Aug 21, 2020 at 9:38 AM (Merged)
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RECOSERVICE
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how to replace injectors
Aug 21, 2020 at 9:39 AM (Merged)
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BRIAN 1
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these suck to do,you have to remove both valve covers and the fuel rails.the injectors are down in the head,you need a special tool to remove the injectors or you cant remove them. and you have to clean the injector bore and each fuel line,they get deposits of rust that has to be cleaned.this is the tool you will need,


https://www.2carpros.com/forum/automotive_pictures/147643_injector_1.jpg

post back with any other questions.
Aug 21, 2020 at 9:39 AM (Merged)
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JODY SHEETS
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I fill my tank every 2 weeks. My question is: am I harming my engine by adding a bottle of Heet with each fill up? Will repeated use of this product harm my engine? I had been having injector problems, I put injector cleaner in, and used a bottle of Heet. I just want to be sure my injectors are clean. :?
Aug 21, 2020 at 9:39 AM (Merged)
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SERVICE WRITER
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The pour in additives are only somewhat effective. If you add it only do it every 4 tank fulls or so. It will affect it in the long run.

Are the injector problems still present? Why injectors?
Aug 21, 2020 at 9:39 AM (Merged)
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JODY SHEETS
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I was getting a spark knock noise. And ask what I could do to get rid of it. And I was told to clean the injectors. At first I thought it was a knock sensor an had a friend scan it. And they didn't show up. Plus is what the dealership told me. :?
Aug 21, 2020 at 9:39 AM (Merged)
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GOGO1949
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When driving the truck it would suddenly lose power and stop, like I was running out of gas. After it sat for awhile I can dirve it again. I replaced all 4 O2 sensors and the fuel filter.

I was told I could try adding BG44K to the gas tank and this would clean the fuel injectors. A mechanic said he uses transmission fluid instead and it works just as well.
Aug 21, 2020 at 9:39 AM (Merged)
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JDL
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When the problem occurs, have a helper crank it, while you visually check for spark at the plugs. If that check out, use a gage and check fuel pressure. Some of the national brand autostores used to loan out a fuel pressure gage, if you don't have one. Don't let gas spray all over a hot engine. Safety is your responsibility.

To check for spark, you can use a known good spark plug or spark tester, carry it in the glove box, it won't get hot. If the engine is hot, wear gloves and/or use a spark plug wire puller. Pull the plug wire, stick tester in the boot, ground metal part of plug/tester to metal part of engine. Engine cranking, watch for spark. Let us know what you find.
Aug 21, 2020 at 9:39 AM (Merged)
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COREYLEO
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I replaced the junkie stock spider injectors and now it won't start.. It's filling cylinder 7 with to much gas it hydro locks.. Also had a lot of gas in the oil what is causing it.. Can it be fixed of is it finally time to replace the engine?
Aug 21, 2020 at 9:41 AM (Merged)
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CARADIODOC
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Pull the vacuum hose off the fuel pressure regulator and check if it's wet inside. If it is, the regulator is leaking fuel into the intake manifold and needs to be replaced.
Aug 21, 2020 at 9:41 AM (Merged)
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COREYLEO
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One problem the fuel pressure regulator is attached to the spider injector unit under the upper intake manifold and when it was replaced there was no hose connected to it!
Aug 21, 2020 at 9:41 AM (Merged)
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CARADIODOC
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Here's a photo from Rock Auto. The red arrow is pointing to the hose connection on the regulator.
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Aug 21, 2020 at 9:41 AM (Merged)
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JOE1953
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i have not been able to find any
Aug 21, 2020 at 9:41 AM (Merged)
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FACTORYJACK
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Fuel injectors? It should have eight of them. Since you can't see them, it is probably a central fuel injection system. The are actually poppet style injectors, housed inside of the intake manifold.
Aug 21, 2020 at 9:41 AM (Merged)
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JOE1953
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how do i replace the injectors
Aug 21, 2020 at 9:41 AM (Merged)
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FACTORYJACK
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You need to remove the upper intake, why would you want to replace all of them? If you have cold start running problems, try having them cleaned. The poppet nozzles are known to stick.
Aug 21, 2020 at 9:41 AM (Merged)
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JOE1953
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i have a misfiring on no.5 cylinder at idle sometime check engine light be blinking when i take no.5 sparkplug out it have white carbon build up on it i believe no.5 injectors is going bad is there something i can put in the gas to fix it, or is it better to remove the lower and upper intake manifold to replace the spider injectors, how many hours it take to replace the spider injectors?
Aug 21, 2020 at 9:41 AM (Merged)
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HMAC300
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you cold try a cleaner but you should only use the pro type cleaner that mechanics use not the stuff added to tanks
Aug 21, 2020 at 9:41 AM (Merged)
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JOE1953
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where do i get the pro type cleaner from?
Aug 21, 2020 at 9:41 AM (Merged)
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HMAC300
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normally only garages have that as its' a whole kit that they use.
Aug 21, 2020 at 9:41 AM (Merged)
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JOE1953
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if i just replace all the injectors and don't worry about cleaning the old one do i need to remove the lower and upper intake manifold.
Aug 21, 2020 at 9:41 AM (Merged)
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HARVEYBRIAN1
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I just replaced the fuel pump on my truck and not it doesnt want to fire. I am getting fuel to the top of the upper intake manifold, but it doesnt seem to be going thru the injectors. Is there a reset or a code? Someone told me there is a sequence I can do with the key in the ignition.
Aug 21, 2020 at 9:41 AM (Merged)