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(Mk1 tech, electrical) My car won't work! (long, but I need help!)
- Subject: (Mk1 tech, electrical) My car won't work! (long, but I need help!)
- From: bronson@inwave.com (Nate Mellom)
- Date: Sat, 11 Jan 2003 10:05:01 -0600
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Rocers,
On Monday, I went to leave work, when I started my car it started kind
of funny (erratic stumbly idle, but it smoothed out after a few
seconds). I took off to leave and it died on me, instantly. Tach
dropped to zero, no run-on. Got it started again, where it promptly
died. I jumped my fuel pump relay contacts, thinking my relay was shot,
it started, I made it half a block away, and it died again. The last
time I had this kind of problem, it turned out to be a bad distributor.
I installed a new (used) one, and it's been fine ever since. So,
symptoms: Instant death, instant tach drop. No fuel pump. No spark.
Distributor cap contacts are all nasty, I sanded them down but never
got to metal. Rotor has seen better days.
I did some tests, and I came up with the following:
1) Battery voltage: 12.4v
2) Pulled all 5 wires (2 grounds, 2 positives and the high tension wire)
off the coil, and got 12.34v at the hot lead to the coil.
3) Put the hot lead only on the coil, and tested at 12.29v at the coil.
4) Hooked up the hot lead and the other positive wire (I'm assuming the
second hot connection runs the fuel pump relay and tach) and got 3.47v
at the coil.
5) Hooked up all 5 wires, and I got 3.33v at the coil.
I did some tests on the signal wire:
5) No continuity, but...
6) 121.5k ohms resistance.
7) Hooked up my tester with positive being the battery and the signal
wire as ground, and I got 11.94v, key on or off.
8) Hooked up my tester with negative being the battery and the signal
wire as hot, and got nothing.
I checked resistance at the coil, no wires attached and got the following:
9) From hot to ground, I got .8 ohms. Bentley said it should be .52 - .76.
10) From the high tension to hot, I got 6000 ohms. Bentley....2400 - 3500.
My impressions:
Somewhere down the line on the signal wire from the coil, I'm losing
ground or have a short to ground somewhere. (See #4) I get voltage, but
I don't get continuity. I'm really at a loss unless I have bad wires in
my dash somewhere. The ignition switch is 6 months old, so I don't
think that's the problem.
Any ideas would be VERY appriciated, my car is stranded at work....
Nate
'81
'84
Both dead.
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Rocers,<br>
On Monday, I went to leave work, when I started my car it started kind of
funny (erratic stumbly idle, but it smoothed out after a few seconds). I
took off to leave and it died on me, instantly. Tach dropped to zero, no
run-on. Got it started again, where it promptly died. I jumped my fuel pump
relay contacts, thinking my relay was shot, it started, I made it half a
block away, and it died again. The last time I had this kind of problem,
it turned out to be a bad distributor. I installed a new (used) one, and
it's been fine ever since. So, symptoms: Instant death, instant tach drop.
No fuel pump. No spark. Distributor cap contacts are all nasty, I sanded
them down but never got to metal. Rotor has seen better days.<br>
I did some tests, and I came up with the following:<br>
1) Battery voltage: 12.4v<br>
2) Pulled all 5 wires (2 grounds, 2 positives and the high tension wire)
off the coil, and got 12.34v at the hot lead to the coil.<br>
3) Put the hot lead only on the coil, and tested at 12.29v at the coil.<br>
4) Hooked up the hot lead and the other positive wire (I'm assuming the
second hot connection runs the fuel pump relay and tach) and got 3.47v at
the coil.<br>
5) Hooked up all 5 wires, and I got 3.33v at the coil.<br>
I did some tests on the signal wire:<br>
5) No continuity, but...<br>
6) 121.5k ohms resistance.<br>
7) Hooked up my tester with positive being the battery and the signal wire
as ground, and I got 11.94v, key on or off.<br>
8) Hooked up my tester with negative being the battery and the signal wire
as hot, and got nothing.<br>
I checked resistance at the coil, no wires attached and got the following:<br>
9) From hot to ground, I got .8 ohms. Bentley said it should be .52 - .76.<br>
10) From the high tension to hot, I got 6000 ohms. Bentley....2400 - 3500.<br>
<br>
My impressions:<br>
Somewhere down the line on the signal wire from the coil, I'm losing ground
or have a short to ground somewhere. (See #4) I get voltage, but I don't
get continuity. I'm really at a loss unless I have bad wires in my dash
somewhere. The ignition switch is 6 months old, so I don't think that's
the problem.<br>
<br>
Any ideas would be VERY appriciated, my car is stranded at work....<br>
<br>
Nate<br>
'81<br>
'84<br>
Both dead.<br>
<br>
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