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EF Ground Floating??? 

 

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 Post subject: EF Ground Floating???
Posted: Wed May 28, 2008 11:45 pm 
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I have an EF Ghia. Seems my problems at the moment stem from a floating ground (There is up to .5v difference from the battery earth to the block).

Now seeing as this is the *major* connection - this presents a problem : o2 sensors see .5v more, or less etc etc.

The AU seems to have a strap back to the body from the engine as well (A decent one), and the EB also had one.

Is this a common problem on the EF?

Nigel
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Posted: Thu May 29, 2008 12:22 am 
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A lot of people add an extra Earth strap on all makes and models,

I myself have added another earth from battery to block and block to chassis.

 

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Posted: Thu May 29, 2008 12:55 am 
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Is there any change after cleaning the block connection and the battery post connection ???
What resistance are you getting from the engine earth strap ??

 

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Posted: Thu May 29, 2008 1:06 am 
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i replaced my factory earth straps from batt--->chassis--->block with thicker 4guage earth straps didnt really notice a difference but hey for $25 and a solid ground im not complaining :D

 

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Posted: Thu May 29, 2008 1:57 am 
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I cleaned the existing connections when I put the AU Engine in : I was *very* suprised that I had that much drop.

It was very measurable at .2-.3v during the day, and at night (Additional lighting load) it is higher - enough that the car struggles to run.

The EB used to have a strap from the gearbox to chassis as well.

I will be getting all 3 straps replaced I think tomorrow : $40 isnt a lot to pay for peace of mind. Im hoping I can get some custom ones done up at a welding shop.
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Posted: Thu May 29, 2008 6:54 am 
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I have a 0ag wire hose clamped to the O2 sensor and connected back to the gas earth. Thats the only sensor that matters for my LPG.

 

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Posted: Thu May 29, 2008 7:45 am 
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He he he - and oddly enough, its the only one that really gives me problems right now - its affecting petrol as well but not as much.

Im actually thinking of moving my LPG earth to the o2 Sensor instead.

but - if theres floating volts anywhere it also means the radiator tends to get hit with electrolysis as well - and the head gasket - and the head.

Nigel
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Posted: Thu May 29, 2008 7:54 am 
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You still need a solid earth from block to motor and block to battery.

 

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Posted: Thu May 29, 2008 8:08 am 
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Im going for both of those (Why on earth ford didnt do block to body I dont know - they did on EB, and AU)

Im also going battery to earth as well just for good measure.
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Posted: Thu May 29, 2008 9:22 am 
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I had an earthing problem in my ef so i cleaned the batterey to block cable and the little earth near the header tank and there is an earth on the passenger side under the intake manifold behind the A/C pump that you can reach from under the car with the oil filter removed why ford put one there i have no idea.
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