1991 240 DL Loose Wire in engine compartment

[Glenn and Janice]

I have a loose wire - It is mounted/screwed to the firewall on the rear
of the engine. By itself. It is a flat wire that is sort of cloth/mesh
looking about 10-12" long and goes to nothing. The loose end is fraid
and looks like its some kind of ground wire, Anybody have a clue what
this is?

Also how do I know if the Fuel Pressure Regulator is bad?

 

[Johan Plane]

I have a loose wire - It is mounted/screwed to the firewall on the rear
of the engine. By itself. It is a flat wire that is sort of cloth/mesh
looking about 10-12" long and goes to nothing. The loose end is fraid
and looks like its some kind of ground wire, Anybody have a clue what
this is?

Also how do I know if the Fuel Pressure Regulator is bad?

It's a ground wire to ensure engine has negative ground.

 

[M-gineering]

It's a ground wire to ensure engine has negative ground.

and it is bolted with a crimped eyelet to one of the camcover bolts

 

[Tim McNamara]

I have a loose wire - It is mounted/screwed to the firewall on the
rear of the engine. By itself. It is a flat wire that is sort of
cloth/mesh looking about 10-12" long and goes to nothing. The loose
end is fraid and looks like its some kind of ground wire, Anybody
have a clue what this is?

Sounds like the engine ground wire. There should be a crimp-on eyelet
for the loose end held onto the engine by one of the cam cover bolts.

If you don't have one, get a good book about your volvo which will have
diagrams for this stuff, as well as trouble shooting procedures. Even a
mediocre one like the Haynes manual would help, but the Bentley manual
is better.

 

[zencraps]

As I've posted before, the BEST wiring schematic I have come across is
in the Mitchell Repair Manuals in the public library.

 

[User]

I have a loose wire - It is mounted/screwed to the firewall on the rear
of the engine. By itself. It is a flat wire that is sort of cloth/mesh
looking about 10-12" long and goes to nothing. The loose end is fraid
and looks like its some kind of ground wire, Anybody have a clue what
this is?

Also how do I know if the Fuel Pressure Regulator is bad?

The FPR is bad when fuel runs out of the vacuum hose going to the intake
manifold. At that point the diapragm inside the capsule is ruptured and
raw fuel is gushing into the intake manifold in a large enough quantity
to flood and hydrolock the motor.

Bob

 

[John Robertson]

Its a ground wire on my 740 which has two , it went as well so I just
replaced it after all we dont want power using our cables to earth do we?