Looking for junkyard fuel injector options

[evilmiata]

I've been blaming my Haltech for months as the reason that my car won't start. Turns out that 5 of my injectors aren't firing.

What makes a fuel injector go bad?

What cars should I look for in a junkyard and what size injectors do they provide? I'm using the stock 3.4 injectors.

Are there any DIYs for cleaning injectors?

[evilmiata]

Update:

I cobbled together a fuel injector cleaner with a spare fuel pump, FPR, a T barb, and four feet of fuel hose. The stock injectors cleaned up fine and the car is running, but my 550s aren't doing a thing. They heat up when I apply current to them, but they don't hum like the stock ones (with a stethascope). Does it make a difference that the 550s are low impedance and the stock ones are high impedance?

[Superdave]

Yes, it makes a difference. If the injector drivers can't handle the current you'll burn them up with the low impedance injectors.

[Alxsmt]

you could always send your old injectors to these guys http://www.rceng.com/

thats what i did with new injectors, the flow sheet i got back showed some were flowing like crap. of course now they all flow really close to eachother

[evilmiata]

Thanks for the advice, guys. Just to be clear, I was wondering why I can't hear the low impedance fuel injector hum when I applied 12v to it. I'm running a Haltech so I'm not so worried about the injector drivers.

I thought of RC engineering since my 550s are RCs. But $24 per injector is pretty steep, especially since I've since learned that the Haltech can't drive 6 low impedance injectors.

[gectek]

because it isnt the voltage that it takes to open them...its the current, the impedence is proportional to the amount of current it would take to open them...you will run high current loads with some low impedence injectors...stock are high impedence...the ones you are trying to open arent because the current is not high enough...thats why they dont hum

i have a set of 3400 22.5# injectors for sale...$60, they are used but they were flowmatched by witchhunter...

[evilmiata]

How much current are we talking to open the low impedance injectors?

[gectek]

depends...ull have to get ahold of whoever you bought it from, i know its enough to ruin a perfectly good driver if it isnt heavy duty and protected from current spikes and the backlash that happens when the field collapses...

[Joseph Upson]

How much current are we talking to open the low impedance injectors?

You can also ruin an injector if you are not careful when applying 12 volts directly, particularly since you mentioned injectors heating up during your test.

I believe the technical name for the low impedance injectors is peak-hold in that a high current is used to open them and then is immediately reduced while holding them open since the current requirement at that point is lower.

[gectek]

it really isnt that high of a current anyway though, the computer isnt made for much more over 10-15 amps...that spike is the higher part of the field, but you also get another inductive kick at the end when the pulse width is over...