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  #1  
Old 08-01-2008, 01:31 AM
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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.
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  #2  
Old 08-01-2008, 01:39 AM
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Join Date: Aug 1999
Location: Florida / N.H.
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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.
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Last edited by Arthur Dalton; 08-01-2008 at 01:45 AM.
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  #3  
Old 08-01-2008, 08:41 AM
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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.
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  #4  
Old 08-01-2008, 12:07 PM
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Join Date: Aug 1999
Location: Florida / N.H.
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Then get the codes...

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

E320 16 PIN DTC Charts inc. pin 8, pin 14
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