Bad fuel injectors... - Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum



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Go Back   Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum > 2002 - 2009 TrailBlazer/Envoy Tech > 02-09 Vortec 4.2L I-6 Engine and Drivetrain > OEM Issues

OEM Issues Original Equipment Repairs and/or Problems

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  #1  
Old 09-25-2008, 04:38 PM
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Bad fuel injectors...

I have fuel injectors that are really dirty and need to be cleaned ASAP. i'm thinking about sending it into a company that cleans them using the "off-car" method and charges about $120 for them ($18/per injector). The reason why i'm looking forward to cleaning them is because the cold-carbon knock is getting worse, and performance is robbed! plus gas mileage is going down. I've tried using techron, that only helps the problem a little bit, then comes back, and i don't want to use techron in every tank and have my engine running to hot. the only question that i have is how do i take out the injectors? i've never taken them off an i6 before, yet alone finding them. any help? and is there a less expensive way into cleaning them? thanks for any help!
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  #2  
Old 09-25-2008, 05:02 PM
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You might try a can of Seafoam first, its quite a bit more powerful than adding Techron cleaner into the tank. You disconnect a large vacuum hose, usually the brake booster, and suck in 1/3 of the can. Turn off the engine and let it sit for 30 minutes or so. Reconnect the hose and when you start it, you'll usually need to rev it a bit to keep it running.....be prepared to fog the neighborhood, this produces HUGE amounts of white smoke for several minutes. Pour the balance of the can into your fuel tank and it will clean out the rest of the fuel system. - This is what many of the repair shops use to clean the fuel system and injectors, its really strong stuff. This will also clean the valves and upper cylinder head as well.
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Old 09-25-2008, 06:18 PM
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theres a post around here somewhere- one of the members cleaned the injectors on his own using some stuff that he connected to the fuel system (left the fuel system off)... it was like a week ago... so its around here somewhere/....
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Old 09-25-2008, 09:53 PM
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Quote:
Originally Posted by rbarrios View Post
theres a post around here somewhere- one of the members cleaned the injectors on his own using some stuff that he connected to the fuel system (left the fuel system off)... it was like a week ago... so its around here somewhere/....
yea i read that thread. I'm just looking to take off the fuel rail with the injectors. anybody know?
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Old 09-26-2008, 12:38 PM
AbsoluteZero AbsoluteZero is offline
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Several years ago I bought a set of reconditioned injectors for a 3.4l Pontiac van from http://www.lindertech.com/reconinj.htm
Was very satisfied with both the injectors and response from lindertech.
Might be an option to buy and have on hand to minimize downtime.
For future reference use of toptier gas should prevent/reduce future occurances. see. www.toptiergas.com
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Old 09-27-2008, 12:16 AM
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[QUOTE=AbsoluteZero;613633]Several years ago I bought a set of reconditioned injectors for a 3.4l Pontiac van from http://www.lindertech.com/reconinj.htm
Was very satisfied with both the injectors and response from lindertech.
Might be an option to buy and have on hand to minimize downtime.
For future reference use of toptier gas should prevent/reduce future occurances. see. www.toptiergas.com[/QUOTE


how is BP Amoco (with invigorate) not a top tier gasoline???? i've been using it for about a year now!
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  #7  
Old 09-27-2008, 08:38 AM
AbsoluteZero AbsoluteZero is offline
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"how is BP Amoco (with invigorate) not a top tier gasoline???? i've been using it for about a year now"

The deal with toptiergas is to "qualify" the fuel meets a performance standard for additives. This isn't to say Amoco is bad, it's you don't know. It might contain an additive but not of sufficient level to meet the standard. I just mentioned it 'cause often deposits are the result of the fuel used.
I don't have personal experience but a neighbor's TB had set a "too lean" code. He had an extended warranty. The GM injector cleaning process didn't work and they replaced the injectors. Apparently the intake manifold had to come off for access.
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  #8  
Old 09-28-2008, 02:05 AM
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Quote:
Originally Posted by rbarrios View Post
theres a post around here somewhere- one of the members cleaned the injectors on his own using some stuff that he connected to the fuel system (left the fuel system off)... it was like a week ago... so its around here somewhere/....
I think it's this one

http://forums.trailvoy.com/showthread.php?t=45911



if you REALLY want to take out the fuel rail, be prepared, yuo must remove the intake manifold, (wich is a bitch) and then call the magic gods of acrobatic bolt removers...the last bolts are a bitch to remove, try the pressurized can like i did, not only does it clean you injector and removes all the carbon and cleans your intake valves also....
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  #9  
Old 09-28-2008, 02:28 AM
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Removing the intake manifold is a MAJOR job and takes a lot of time and effort. Try some Seafoam or BG44K before you decide to attack the injectors!
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  #10  
Old 06-22-2009, 03:44 PM
tvidit04 tvidit04 is offline
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Lightbulb Vacuum Hoses

I want to try the seafoam to clean my injectors before I replace one of them. Where do I find the vacuum hose to suck out 1/3 of a can? 2002 Trailblazer with a 4.2 straight six.
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