Dirty injectors

[JOB]

My daughter has a 94 Gimmy most likely a six cylinder. Six months ago she had some work done on the little truck and the mechanic said the injectors were a little dirty and she should run injector cleaner through them every other tank of gas. Now the truck goes zero to fifty in three minutes. She is a college student in Milwaukee and I am six hours away. What I was wanting to know is how hard is it to remove an injector and take it apart and clean it, and get it back in the engine? Or do you need special equipment? Thanks for any help

 

[msb]

No job for someone who has no training.Bad advice given about injector cleaner. May have scored the internal parts.Pull them out and take them to a diesel shop and have them tested.Sorry

 

[Revredneck]

If it has the 4.3 V6, it is most likely the CPI system. I would check the simple stuff first, plugged fuel filter or catalytic converter. The fuel pressure regulator and supply lines are bad about leaking into the intake on those engines. Put a fuel pressure gage on it and check to see if the pressure leaks down after you shut off the engine. It should hold pressure for several minutes -- if it leaks down, you probably have an internal leak. There is no taking apart and servicing that unit, you have to replace the whole thing, if it's bad. Not too complicated a process, just remove the upper intake assembly and replace the CPI unit. Be sure to replace the gaskets, too. If you take your time and pay close attention to where everything goes, you can do the job yourself. HTH
Good Luck and God Bless

 

[Uncle Ernie]

'94 Jimmie with a 6 would be a gasser.

 

[buickanddeere]

Is it the 1st year updated Jimmy, a 1995 with the rounded body styling?
We went through three replacements of those weird single injector, six spray nozzle headaches on the wife's Jimmy. One was a dud right out of the box and hydraulically locked the engine by filling it with gasoline.
Once they fail and slobber. The engine will never run decent. Brace yourself for the price.

 

[Crem]

I was surprised but our local diesel repair shop will clean and check the spray pattern of gasoline engine fuel injectors. I don't know if it is cost effective though.

 

[Brian Jasper co. Ia]

There is no taking the injectors apart and cleaning them. Pour in the tank cleaners are a waste of money. Like B&D says, the injector on a Vortec 4.3 is prone to fuel pressure regulator failure. They fixed that when they went to the plastic upper intake and sequential injection. When the regulator starts to leak, it floods the engine and it runs poorly. Continued running with a poorly performing engine usually plugs the catalytic converter. To clean injectors effectively, you need to disable the fuel pump and connect an air pressurized cleaning tank to the system that runs the engine on the cleaner. I do this frequently. The people who notice the most improvement seem to be the little old ladies who drive lots of short in town trips. I cleaned the injectors on my 80 year old mother's car and she later reported a 3 mpg average increase in mileage.

 

[RodinNS]

Don't know why one would assume it's an injector problem.
My first thought would be new plugs and wires if that hasn't been done in a while.
If the check engine light is on, find out what codes it's throwing.
Plugged Cat converter is another possibility. Is it making a whistle from the exhaust?

Rod

 

[Brad Gyde]

I'd look into the plugs/wires/etc, and the cat too..

Friend of mine's car was acting up.. not throwing a code.. would buck and carry on, take forever to get up to cruising speed, but once there, it would run decent. Checked fuel pressure.. OK..(but good pressure doesn't necessarily mean enough volume) Changed fuel filter.. MADE IT WORSE.. I was stumped.. Had next to no exhaust coming out.. New cat, drives like new again.

I have a newer truck with the 4.3 in it.. it too last fall was running "stupid", then one day it stalled and wouldn't restart.. Cap and rotor had developed a corrosion problem (which a service bulletin had mentioned and talked about a "potential" fix)

As for additives.. I had a 01 s-10 that developed a stalling and codes said running lean at roughly 70k miles.. New fuel filter, fixed for a minute.. but same thing.. had a mechanic look at it.. couldn't find anything wrong.. He recommended Lucas fuel additive.. I put it in, and it bothered for about 40 miles (2 days back and forth to work) and never did bother again.. Since then, I add it once a month (mileage depending.. sometimes more, sometimes less) to all 3 of my trucks (gas, diesel, and my company truck) and the girlfriend's car.. snowmobiles, lawnmower, tractors.. everything with a engine. DOES IT REALLY FIX ANYTHING?? I don't know, but I am convinced it does, and it seems like I've had less carb and injector issues since that point..

That's my opinions, and opinions are kinda like ... like u know what's.. we all have one..

Your mileage may vary as many say
Brad

 

[buickanddeere]

Two out of three of the 4.3 Snoretechs we've had and I'm waiting on the 3rd. They have managed to get the distributer rotor/sensor out of time with the the crank sensor.
The crank and dist sensors were sending the computer two different locations of TDC. The rotor was jumping the spark too far from the cap terminals.
All manor of phantom trouble codes and driveability problems.
Solution was to grind a little off the dist base and time the dist via good old fashioned rotation.

 

[36 Coupe]

Leave the injectors alone. A mix of alcohol and diesel fuel will clean them fine.