1994 E320 bad hfm where to find one used?
 

My grandma's 1994 e320 had the typical bad wiring harness which I replaced with a brand new one from MB. But not before the wires arched a couple times on the fuel rail, causing what I believe to be a hfm controller failure.

What I have is cylinder six has no ticking at the injector, I have pulled off the injector rail and swapped other injectors in # 6 slot but it will still not pulse, I realize the proper way to test is with a noid light but I don't have one. The other symptom is I have no a/c MB in Sioux falls, SD said that this could be controlled by the hfm being faulty.

2 questions:
#1 Is this what it sounds like to everyone else?
#2 Where can I find a cheap hfm I've looked on ebay http://cgi.ebay.com/ebaymotors/MERCEDES-300-E-E320-ENGINE-MANAGMENT-COMPUTER-HFM_W0QQcmdZViewItemQQcategoryZ33596QQihZ004QQitemZ140253820539QQrdZ1QQsspagenameZWDVW
but this hfm doesn't look like mine and the numbers are different. I need to get this car running. thanks for looking at my problem.

Check the plug and plug connector to that cylinder.. The ecu cuts injector power if HFM sees an ignition misfire on a cylinder to protect the Cat.

You can also go get the codes for HFM under the hood.

Forgot to mention all new coils, plugs and wires also. I have tried swapping coils around to make sure that the problem is not a faulty coil or wire.

Then get the codes...

I would be mostly intersted in pin #8 [HFM/SFI module]

http://www.peachparts.com/shopforum/showthread.php?t=107630