1986 740 GLE NON TURBO HELP!!!!

  • Thread starter Thread starter Jeff Bergmann
  • Start date Start date
J

Jeff Bergmann

Symptoms:

Car was idling normally then went very quickly oscillated from 2K-3K for
five or six iterations and then died. I checked for spark....NONE. I
checked for a fuel pulse at the injectors...NONE. Any thoughts?

1. After looking at the schematics, the only things I see common to
both systems are

A. The ignition switch
B. The ICU (Ignition Control Unit)
C. The ignition relay.

Any of you techs ever runt across this? Am I going in the right
direction? Is there anything else common?

I replaced the distributor because I was getting no spark out of the
coil but when that didn't fix the problem , that is when I checked for
the fuel pulse and surprise, surprise, it wasn't there either. The
idling just before it died is really strange.

C'mon people, help me out. I love that old bird.

Thanks,

Jeff
 
The black relay is the injector pulse try this 1st if your car has 2 just
swap & see what happens

--
"*-344-*Never Forgotten"
Is for the New York City Firemen who lost their lives on September 11,2001.
The official count is 343, but there was also a volunteer who lost his life
aiding in the initial rescue efforts. And I will never forget them as long
as I live,
nor should any American.
"Mow Green"
 
Jeff said:
Symptoms:

Car was idling normally then went very quickly oscillated from 2K-3K for
five or six iterations and then died. I checked for spark....NONE. I
checked for a fuel pulse at the injectors...NONE. Any thoughts?

1. After looking at the schematics, the only things I see common to
both systems are

A. The ignition switch
B. The ICU (Ignition Control Unit)
C. The ignition relay.

Any of you techs ever runt across this? Am I going in the right
direction? Is there anything else common?

I replaced the distributor because I was getting no spark out of the
coil but when that didn't fix the problem , that is when I checked for
the fuel pulse and surprise, surprise, it wasn't there either. The
idling just before it died is really strange.

C'mon people, help me out. I love that old bird.

Thanks,

Jeff
Click to expand...

The fuel computer reads the signal from the primary (low voltage) side
of the ignition. If you have no ignition primary, the fuel pump won't
run and the injectors won't pulse.

Common failures that kill the ignition primary (in addition to the black
relay that Glenn mentioned) are the hall sender in the distributor (you
seem to have eliminated that) and the power stage that is located on the
inner fender up beside the air filter box.

--
Mike F.
Thornhill (near Toronto), Ont.

NOTE: new address!!
Replace tt with t (twice!) and remove parentheses to email me directly.
(But I check the newsgroup more often than this email address.)
 
I am sorry that you are having this trouble. We have had similar troubles
with ours but I cannot tell you what exactly finally fixed it. If I ever
find out I will let you know.
I was also wondering if you could point in a direction of some website
that would give me a diagram of the fuse box - what each fuse is for. I
loaned my car to someone and they took all my paperwork and my manual out
of my car and I have been unable to get it back. I have to change the
flasher relay and I want to make sure I have all fresh fuses at the same
time.
Thank you for any help you can give.
 
I am sorry that you are having this trouble. We have had similar troubles
with ours but I cannot tell you what exactly finally fixed it. If I ever
find out I will let you know.
I was also wondering if you could point in a direction of some website
that would give me a diagram of the fuse box - what each fuse is for. I
loaned my car to someone and they took all my paperwork and my manual out
of my car and I have been unable to get it back. I have to change the
flasher relay and I want to make sure I have all fresh fuses at the same
time.
Thank you for any help you can give.
 
You must log in or register to reply here.
Back
Top