Good way to check injectors

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I cleaned injectors a couple times by using my mighty vac pump hooke dup to the rail end of the injector, create a vacuum.
Hook the injector up to a light 5v AC adaptor, and put the engine end of the
injector in a bowl with carb cleaner.
The 5V ac makes the injector pulsate and the carb cleaner gets sucked through it. You will be amazed how much crap comes out of the injector. U can also check the spraypatern like that.
Mathijs Derks
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Pretty good trick, bud. Do you have some kind of jar in the line between the rail and the vac. pump so you can see what kind of dirt, etc. are coming out of the injector and rail?
Garrett Fulton
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============== snipped-for-privacy@com.com (mathijs)
I cleaned injectors a couple times by using my mighty vac pump hooke dup to the rail end of the injector, create a vacuum.
Hook the injector up to a light 5v AC adaptor, and put the engine end of the injector in a bowl with carb cleaner.
The 5V ac makes the injector pulsate and the carb cleaner gets sucked through it. You will be amazed how much crap comes out of the injector. U can also check the spraypatern like that.
Mathijs Derks ====================== I don't believe you.
MarshMonster ~:~ ====================
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That's up to you
(mathijs)

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============== snipped-for-privacy@com.com (mathijs)
I cleaned injectors a couple times by using my mighty vac pump hooke dup to the rail end of the injector, create a vacuum.
Hook the injector up to a light 5v AC adaptor, and put the engine end of the injector in a bowl with carb cleaner.
The 5V ac makes the injector pulsate and the carb cleaner gets sucked through it. You will be amazed how much crap comes out of the injector. U can also check the spraypatern like that.
Mathijs Derks ======================"Marsh Monster" wrote:
I don't believe you.
MarshMonster ~:~ ==================== snipped-for-privacy@com.com (mathijs) replied:
That's up to you
================== ok
Marsh ~pours a little more JD in his coffee~ ================
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How does constant voltage make the injector pulse?
How do you check the spray pattern, when you are pulling cleaner through the spray nozzle end?
How do you prevent fuel from reentering the fuel rail, when you apply vacum to the rain, and the fuel return line is not valved with a check valve. Nor is the fuel pump a stop valve, it's a pass through design?
Refinish King

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Absolutely. It's AC. And the way I understand what he's doing, he's disconnecting the rail from the fuel lines, removing it, sealing it, applying vacuum, and cleaning the injectors with his method. As far as the spray pattern, I would imagine he's hooking the lines and injector harness back up before reinstalling the rail. Cranking the engine and checking the spray pattern. No it's not real safe, but I've done it myself on a 3.4 L DOHC Olds Cutlass engine. Didn't kill myself or burn the garage down.
Garrett Fulton
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It's The AC that makes them pulse,
And to check the spray patern, I remove the injectors from the fuel rail and I have a canister with fuel, Add 40 psi of air pressure, hook up the 5v AC and the injectors open 60 times a sec. Works fine for me

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==================Aug 1, 2004, 12:53am (CDT-1) From: snipped-for-privacy@com.com (mathijs)
It's The AC that makes them pulse,
And to check the spray patern, I remove the injectors from the fuel rail and I have a canister with fuel, Add 40 psi of air pressure, hook up the 5v AC and the injectors open 60 times a sec.
Works fine for me ====================== How do you know they're opening 60 times a second?
Marsh ~:~
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(mathijs)

I guess he's counting getting his 60 cycles from the 5 volt AC.
Brian
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========= ========== Aug 1, 2004, 12:53am (CDT-1) From: snipped-for-privacy@com.com (mathijs)
It's The AC that makes them pulse, And to check the spray patern, I remove the injectors from the fuel rail and I have a canister with fuel, Add 40 psi of air pressure, hook up the 5v AC and the injectors open 60 times a sec. Works fine for me ============ ============ MarshMonster scratched his head...sipped his coffee... and asked:
How do you know they're opening 60 times a second?
Marsh ~:~ ========== ========== . . ======= ======= snipped-for-privacy@spam.not (elDiablo) writes:
I guess he's counting getting his 60 cycles from the 5 volt AC.
Brian ========= ========= But Devil dude, you reckon his eyes is so good.....
he can actually see 60 pulses on a spray pattern......per second???
what if he's only get'n......mmmm..... 30 openings a second, reckon he could tell the difference?
hey..... how bout this..... what if it's staying open.... instead of sticking??
reckon he'd know the difference by looking a 1 second spray pattern?
after all....... he ain't said nut'n bout no leak down test.
There ain't no way he's ever gonna be sure that they're opening 60 times a second just by looking at the pattern.
No matter what he's led himself to believe with his home experiments.
It's not a good way to check injectors.
I will grant.....it is "A" way....... (a very basic way)
But....definately not a GOOD way.
lol
~:~ Marsh ~sticks his fanger in the light socket......
O O + /0\
yep.......she's a work'n alrighty~~ ======== ========
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HAAAAHAAHAAAAAAAAAAA!!!
~:~ Marsh ~sticks his fanger in the light socket......
O O + /0\
yep.......she's a work'n alrighty~~ ==============
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Up here the Frequency of the Household power is 60 Hz, and the transformer directly converts the Voltage not the Frequency.
(mathijs)

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(mathijs)

Using 60 Hz AC (sine wave) will do just fine for this purpose. If you're to run the injectors for their intended purpose you would need to feed them a PWM (Pulse Width Modulation) signal, which is typically a square wave. There are many wonderful articles on the net to make test bench setups for testing and calibrating the flow rate of injectors.
Rita
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Rita:
I never saw an article for making one, and have my own idea for making a test bench. With a flow rate and all.
Can you please lead me to any of these sites?
Thank you in advance!
Refinish King
(mathijs)

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http://www.cosworthvega.com/Articles/InjectorTester/Homemade%20Injector%20Cleaner.htm
Modify and build to your own needs.
Rita
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Thank you Rita:
Sincerely,
Refinish King

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AC is 60HZ at the wall:
So if his voltage reducer is AC, it makes 5V AC.
Sounds like a good idea for pulsing the injectors, at a bargain basement price, but the canister with gas and air scares me!
Refinish King
(mathijs)

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Sounds like a good idea:
The only scary thing is the canister with gasoline and air.
but, my apologies for misunderstanding the AC in your other post.
I have an OTC injector pulser, with three different settings, in milliseconds, and the gauge reads in both PSI and Kilopascals.
The Kilopascals seems more accurate for finding clogged injectors, and for leaky ones, you just see the pressure run right out of the line, then it's remove one at a time till you find the bad one.
Refinish King

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