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Author Topic: Code 13  (Read 29166 times)

Offline VileZambonie

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Re: Code 13
« Reply #30 on: November 24, 2010, 11:34:09 am »
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74 GMC, 75 K5, 84 GMC, 85 K20, 86 k20, 79 K10

Offline Unofficial

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Re: Code 13
« Reply #31 on: December 05, 2010, 10:10:47 am »
Well I finally got around to testing it, and I'm getting voltage to the wire.

I'm gonna go check for a ground wire I might have missed... but wouldn't I be having other problems if I missed a ground wire?
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1987 Custom Deluxe R10
350 TBI bored .040 over
700r4 with a Transgo shift kit
MSD ignition
Long tube headers w/ true duals
Upgraded sound system w/ subwoofer

Offline VileZambonie

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Re: Code 13
« Reply #32 on: December 05, 2010, 12:34:41 pm »
You mean the O2 voltage is getting to the ECM? That ground is specifically the ECM ground for that circuit. It's one or the other so if the voltage is getting to the ECM then your problem is the ground circuit.
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74 GMC, 75 K5, 84 GMC, 85 K20, 86 k20, 79 K10

Offline Unofficial

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Re: Code 13
« Reply #33 on: December 05, 2010, 03:19:23 pm »
Well I went from d6 to the engin block and had pretty high resistance, so now what?
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1987 Custom Deluxe R10
350 TBI bored .040 over
700r4 with a Transgo shift kit
MSD ignition
Long tube headers w/ true duals
Upgraded sound system w/ subwoofer

Offline VileZambonie

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Re: Code 13
« Reply #34 on: December 05, 2010, 03:55:27 pm »
So you probably left that ground wire off. Did you check the grounds at the back of the cylinder heads?
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74 GMC, 75 K5, 84 GMC, 85 K20, 86 k20, 79 K10

Offline VileZambonie

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Re: Code 13
« Reply #35 on: December 05, 2010, 03:58:19 pm »
BTW it's a tan wire ckt 413 and should be grounded directly to the engine block.
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74 GMC, 75 K5, 84 GMC, 85 K20, 86 k20, 79 K10

Offline Unofficial

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Re: Code 13
« Reply #36 on: December 05, 2010, 04:16:04 pm »
Ok sweet, I'll look for it. Where can I find this wire?

Kinda weird that I was getting this code before I swapped motors...
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1987 Custom Deluxe R10
350 TBI bored .040 over
700r4 with a Transgo shift kit
MSD ignition
Long tube headers w/ true duals
Upgraded sound system w/ subwoofer

Offline Unofficial

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Re: Code 13
« Reply #37 on: December 10, 2010, 09:30:59 am »
I can't seem to find this wire...Can anyone give me a specific location?
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1987 Custom Deluxe R10
350 TBI bored .040 over
700r4 with a Transgo shift kit
MSD ignition
Long tube headers w/ true duals
Upgraded sound system w/ subwoofer

Offline VileZambonie

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Re: Code 13
« Reply #38 on: December 10, 2010, 08:21:57 pm »
Do you have continuity from that wire to ground?
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74 GMC, 75 K5, 84 GMC, 85 K20, 86 k20, 79 K10

Offline VileZambonie

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Re: Code 13
« Reply #39 on: December 10, 2010, 08:24:34 pm »
Because if you don't that ground wire is off. There are two wires going to the outlet. There should be one at the thermostat housing and two at the back of the cylinder heads.
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74 GMC, 75 K5, 84 GMC, 85 K20, 86 k20, 79 K10

Offline Unofficial

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Re: Code 13
« Reply #40 on: December 12, 2010, 05:58:53 pm »
Well I finally got around to checking it out and I took some pictures...


Here's the one at the thermostat housing like you mentioned Vile


I looked for the two wires you said should be grounded to the back of the cylinder head and I found these...As you can see, one of the wires doesn't have insulation on it all the way to the end, but I didn't think that would cause an open circuit, the bolt is on there tight. What's next?
« Last Edit: December 12, 2010, 06:02:37 pm by Unofficial »
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1987 Custom Deluxe R10
350 TBI bored .040 over
700r4 with a Transgo shift kit
MSD ignition
Long tube headers w/ true duals
Upgraded sound system w/ subwoofer

Offline VileZambonie

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Re: Code 13
« Reply #41 on: December 12, 2010, 06:09:12 pm »
Quote from: VileZambonie on December 10, 2010, 08:21:57 pm
Do you have continuity from that wire to ground?
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74 GMC, 75 K5, 84 GMC, 85 K20, 86 k20, 79 K10

Offline Unofficial

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Re: Code 13
« Reply #42 on: December 12, 2010, 06:53:25 pm »
Well I used an ohmmeter going from the d6 cavity to the back of the engine block and got like 50 ohms, so I figured that was bad... I'm sorry, I'm not so good with this electrical stuff, how do I test for continuity? Go from d6 to that wire this time? What should I measure this time? Ohms again?
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1987 Custom Deluxe R10
350 TBI bored .040 over
700r4 with a Transgo shift kit
MSD ignition
Long tube headers w/ true duals
Upgraded sound system w/ subwoofer

Offline VileZambonie

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Re: Code 13
« Reply #43 on: December 13, 2010, 10:36:18 am »
That wire is spliced into the DLC as well. I would suggest you tap into that wire and run another dedicated clean engine ground.
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74 GMC, 75 K5, 84 GMC, 85 K20, 86 k20, 79 K10

Offline Unofficial

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Re: Code 13
« Reply #44 on: December 13, 2010, 11:00:09 am »
Quote from: VileZambonie on December 13, 2010, 10:36:18 am
That wire is spliced into the DLC as well. I would suggest you tap into that wire and run another dedicated clean engine ground.

DLC=Data Link Control?

Which of the three wires should I come off of for another ground?
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1987 Custom Deluxe R10
350 TBI bored .040 over
700r4 with a Transgo shift kit
MSD ignition
Long tube headers w/ true duals
Upgraded sound system w/ subwoofer
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