How do you test an injector solenoid?

[drus]

I have a 95 F-350. While towing my camper it lost power and the check engine light came on. It seemed like it was firing on only 6 or 7 cynlinders. I removed both valve covers and inspected the wire harnesses, gaskets, etc. Everything looked fine, but when I put the left valve cover back on and cranked it, it only ran on 4 cylinders. The entire left bank was now dead. I pulled it home, where it sat for a week. I pulled the codes with a snap on scanner and got P0270 and P1294. Problem is, it has run fine ever since. The buzz and contribution tests were fine. I've since made a 250 mile trip while towing a trailer and it ran perfectly. I've read where a bad injector solenoid can cause an entire bank to fail. If this is true, and assuming I can ever re-create the problem, is there a way I can test the solenoid on my #4 injector (code P0270)?

[kanuck15]

Poor Man's 7.3 Buzz test

that is the only way really to isolate the number 4 that i know of

[drus]

Thanks for the great info. Do you know if one bad injector solenoid can shut down a whole bank of cylinders?

[kanuck15]

no it shouldnt. First off only two injectors are tied together per harness. The only thing that links an entire bank is the UVCHs. they can go bad and shut down a full bank

[drus]

That was my initial thought, but I would have to have two uvch's go bad at the same time. Or, my valve cover gasket would have to fail in two places at the same time. Either seems unlikely - especially sense it now runs fine - or will one uvch or one valve cover gasket connector cause an entire bank to die? I would think that if the harness that controls #2 and #4 failed, or the gasket connector for that harness failed, cylinders #6 and #8 would be unaffected. Also, if the IDM failed I should have gotten a P1298 code, right?