About 6 months ago (right at 100k miles) I pulled out my injectors while doing some other stuff and sent them off to be cleaned, etc. Less than 1,700 miles later, they crapped out and this was found out by doing every other damn thing I could think of because I never suspected the injectors. Well after doing every other damn thing, that was the only thing left in the system. Well, I got ahold of another set of injectors and low and behold, that was the problem. Recently I read on a board, mighta been this one, that by placing a washer under the fuel rail where it bolts to the manifold will give them more space, not forcing them "all the way down", and I think it was also on the same post that someone else said to read out the injectors and that they should all read 16.0-16.5. Well, for giggles the other day when I was bored, I read the old injectors out, and they all read between 16.0-16.5, so would this indicate that they should be good? The problem I had was a couple of months ago, and the symptoms were that of a bad misfire. (plugs were firing, but injectors weren't) I just wonder now if I had known about the placement of the spacer washers if it might have cured the problem or not. I got a great deal on the injectors from someone else, so I don't really care about that, but curious to know if I coulda fixed it the other way...

 

TS,

A resistance check of a fuel injector operating coil does absolutely nothing to indicate the condition of the screens, pintle, seat, oriface, and spring. It only determines if the coil MAY have been subjected to overvoltage of high current.

The post regarding the spacing of the fuel rail to prevent mechanical binding and distortion of the injectors was applicable to some Edelbrock intake bases which were machined differently than the O.E.M. manifolds. The injectors were apparently bound by the fuel rail, possibly causing mechanical distortion of the injectors and affecting their flow and sealing abilities.

Apparently, your injectors are just fine - electrically. Your test only eliminated that possibility. If they were installed in a manifold base that caused them to bottom in the injector bores and distort, they may be scrap. They might also still be good, once the binding was eliminated and the injector bodies were allowed to relax to their normal dimensions. The only way to determine this is with an operational flow test and pintle propagation delay analysis. Some injectors will flow acceptably once they are opened, but the pintle may be "sluggish" in opening due to wear, dirt, or damage. This is the reason for the second test.

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Later,
Vader
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"Make Me Bad"
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