How to test used fuel injectors?

**ADrugDealer** · 05-10-2015

Originally Posted by coolone

And you were the one to post about people being negative? Really?

YOU have a Degree in Electrical Engineering?

Condescending remarks like talking out of the side of your mouths is real tough on a keyboard, and quite frankly, if you don't have anything good to say, something that's helpful, maybe it's best to just keep it to yourself.

For the record, it's not something as simple as ohms law, because hooking up the injectors to an external circuit or power source that has bypassed the circuitry and built in protections on the wiring harness in the vehicle 'CAN' damage the injectors. And yes, people DO do it, saying no one does it is counterintuitive. And then you contradict yourself by saying it is a problem in the past. So to surmise, your post in nothing more than diatribe... Lastly, please refrain from making assumptions about people and person characterizations that you know little of. Because you do what you do, or did, or want to do, does not make you the end all of knowledge. People come here for useful information, some are experienced, many not... so far I've seen more of you attacking posts than anything offered as useful. If you have a bench and experience why don't you just offer the info. On how to do it RIGHT!

So what does your ohms law tell you when the OP gave the injector 9v instead of 12? Hmmmmm... Meaningless right? Lol...

OP

heres the link I mentioned...
http://www.grandprixforums.net/threa...=Fuel+injector

have a nice day : )

this ^^

**ADrugDealer** · 05-10-2015

Love that word!

**Booba5185** · 05-10-2015

If anything, I'd just put a momentary switch on the power wires to the injector. This is a little redneck, but you kinda get the idea. The injector gets fuel and is "pressurized" then just tap it a few times.

**coolone** · 05-10-2015

Originally Posted by ADecker

Love that word!

See, even when I don't know what I'm talking about... At least I offered something useful and increased others knowledge (vocabulary)! Lolz... ; )

**ADrugDealer** · 05-10-2015

Originally Posted by Booba5185

If anything, I'd just put a momentary switch on the power wires to the injector. This is a little redneck, but you kinda get the idea. The injector gets fuel and is "pressurized" then just tap it a few times.

ooooooor if only there was a thing that used these fancy devices to run and had all this fancy circuitry and programming to pulse them perfectly.. hmmm wonder what we could do.. OH I KNOW! A F*CKING CAR!

OP
Remove bolts
Remove Injectors
Install New Ones
Replace Bolts
Start Car

Does it Run?
No --> Bad Injectors, see step 1
Yes --> Drive, enjoy.

**Booba5185** · 05-10-2015

I'd at least check resistance before doing that. I did that to my dad's Civic and the injector was stuck open completely and flooded the cylinder...then the piston came up and popped the head gasket like a ballon. That was fun.

**J57ltr** · 05-10-2015

Originally Posted by coolone

And you were the one to post about people being negative? Really?

YOU have a Degree in Electrical Engineering?

Condescending remarks like talking out of the side of your mouths is real tough on a keyboard, and quite frankly, if you don't have anything good to say, something that's helpful, maybe it's best to just keep it to yourself.

For the record, it's not something as simple as ohms law, because hooking up the injectors to an external circuit or power source that has bypassed the circuitry and built in protections on the wiring harness in the vehicle 'CAN' damage the injectors. And yes, people DO do it, saying no one does it is counterintuitive. And then you contradict yourself by saying it is a problem in the past. So to surmise, your post in nothing more than diatribe... Lastly, please refrain from making assumptions about people and person characterizations that you know little of. Because you do what you do, or did, or want to do, does not make you the end all of knowledge. People come here for useful information, some are experienced, many not... so far I've seen more of you attacking posts than anything offered as useful. If you have a bench and experience why don't you just offer the info. On how to do it RIGHT!

So what does your ohms law tell you when the OP gave the injector 9v instead of 12? Hmmmmm... Meaningless right? Lol...

OP

heres the link I mentioned...
http://www.grandprixforums.net/threa...=Fuel+injector

have a nice day : )

the op asked about testing the injector off the car before it was installed so I figured he just wants to see if it's stuck or will actually move the disc when he powers it. There was no need to involve the car whatsoever. I never said anything about leaving the injector connected to power for extended periods of time.

Yes I have an associates in electronic engineering and have had for more than 20 years.

when people tell me that PWM makes a huge difference in how to power and test an injector they are talking out of the side of their mouth. Real talk and I'm no keyboard warrior, I will literally fly out and say it to your face if I'm in the area.

In response to your "record" it's a moot point, because testing it on the car is never mentioned. He has used injectors and wanted to test them before he put them in.

a fresh 9V battery will usually get it to open under no load (ie pressure)

Booba I was going to suggest just the type of test you posted, but solvents and arcing could cause problems of the high temp variety. So I just said just test it and make sure it clicks. It is very rare that a used injector will be gummed up without being able to see the build up in the screen on the inlet. That is a very valid test off the car. Which was I thought what the OP asked.

you say people come here for useful information and I'm not seeing it. I ask questions put in extremely detailed information and no body knows, or ask questions that were answered in the original post. As far as asking why is everyone so mean, well after reading on this board for a while I guess you guys are rubbing off on me. That's my bad.

Jeff

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