Hello,

I'm trying to trouble shoot a no spark problem on my 83. I have heard about jumping the terminals B and C on the plug to the distributor. However, my plug does not have these terminals labeled since the Chrysler distributor was previously replaced with a Bosch distributor. The wiring (colors) is exactly the same but I cannot tell which letters correspond to which wire colors. Anyone know???

Thanks in advance.
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KG4BKD
'67 144 205k
'83 245 306k
'87 245 506k

The B-C wire colors are in the 2nd of the 2 tests in the canned post below.
Also note the the spark should occur when the B-C jumper is removed, not when it is inserted.


==========canned post========>

Either test below can be done first, and both assume +12V at Coil terminal #15 with Key On.

(A) Hall Switch Test
1) Pull coil HT wire from distributor cap, attach/adapt to spare (grounded) sparkplug.
2) Remove distributor cap.
3) Rotate engine till an open Vane "window" is centered in front of the Hall Switch.
4) Turn Key ON.
5) Pass a feeler gauge blade (or similar) through the Hall Switch (simulating a moving Vane segment).
•) If the Hall Switch and ICU are OK, you should get a spark at the test plug and fuel pumps should run for a second.
•) Repeat step 5 as needed to verify spark and pumps.
•) If no spark, test ICU operation below (eliminating Hall Switch).

ICU Switching Test
1) Key OFF. (Coil wire and spare plug still set up as in Hall switch test).
2) Remove the 3-wire connector plug from distributor body.
3) Insert a jumper from plug socket B (Yellow wire) to socket C (Black wire). When jumper is REMOVED (step #4) the plug should spark, and the fuel pumps should run briefly.
4) Key ON. Check for spark and pumps as jumper is removed.
•) If Spark & Pumps operate briefly, suspect Hall Switch or wiring.
•) If no spark, suspect ICU or wiring.

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Bruce Young, '93 940-NA (current), 240s (one V8), 140s, 122s, since '63.

Just for reference, Bentley has a nice drawing of this parity between round and rectangular connectors, on p280-9. Assuming not everyone owns a Bentley, I'll try to find where they took it from in the green books and maybe scan it from there.
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Art Benstein near Baltimore

"Bigamy is having one wife or husband too many. Monogamy is the same." (Oscar Wilde)

Thanks guys, I'll give it some more work after work this evening. I actually just ordered a Bentley. I went years without one but I think it could prove very helpful.

They say the hardest problems are hidden in plain sight. I'll let you all know when I find out it's some so simple....

Thanks again!
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KG4BKD
'67 144 205k
'83 245 306k
'87 245 506k

That troubleshooting chart I gave you in your first thread applies to the 83-84 versions of V/C ignition. This one applies to the 85-88 versions for the B230 but includes the rectangular plug drawing. The insets with the plug pinout are the same you'll find in your Bentley when it arrives:

V/C ignition troubleshooting chart for 85-88
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Art Benstein near Baltimore

"The problem with the designated driver program, is that it's not a desirable job, but if you ever get sucked into doing it, have fun with it. At the end of the night, drop them off at the wrong house." (Jeff Foxworthy)

Hi,


I think a neater test would be to check the voltage at the coil and for ground pulses at terminal 1.


Goatman

Yeah I've got nothing there. I mean, I have 12V at #15 on coil but get no pulses, no unload, no spark. I've basically traced every wire in the ignition/engine harness, checked for continuity between wires, &c. Just not sure what else to do but I wanted to at least try this check before giving up.

Thanks.
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KG4BKD
'67 144 205k
'83 245 306k
'87 245 506k

LOL ‘‘Giving Up’’


Come on man, you can do better then ‘‘give it up’’.

Yeah, the hall sensor could be f**ked, But I’d bank on some other problem.


Did you connect the interface between the LH computer and the ignition computer?


Check for power to the ignition computer and to the hall sensor.


Goatman

Haha yeah I hear you. What interfect are you referring to? I might have missed this.

I know I have power on the ignition computer. I've checked all the leads to/from it and everything seems to be doing what it should, except possibly the 3 wires to the distributor. Those I am not entirely certain how they should behave. That's kind of why I was wanting to try the jumper test.

I'll keep at it though!

Thanks again.
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KG4BKD
'67 144 205k
'83 245 306k
'87 245 506k

Hi,


Yes, there is a connector that gives the ignition unit information on the throttle position switch. There is also a connection at the coil for the LH Jetronic computer.

These are the shared connections.


GoatmanI