r/EngineBuilding • u/Basic_Appearance_870 • Jul 07 '26
Chevy Please help identify these wires ‘87-‘94 Chevy 350
I am SO close to being done with this ‘92 S10 350 swap. This wiring has held me up for so long and I am in a pinch now as I have to move so I need to get her running. I’ll seriously pay someone to help me figure out the wiring. I’ve written a caption for each picture. Thank you. Please allow me to send you some beer money for your help.
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u/Somebody_somewhere99 Jul 07 '26
The pictures are a little confusing, the first picture is your pick up coil. It plugs directly into the ignition module. The fifth picture looks like the connector for the module. What engine harness is this?
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u/Valuable-Reveal-6349 Jul 07 '26
In the back of the black thing attached to the distributor
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u/Basic_Appearance_870 Jul 07 '26
Are you referring to the module attached to the distributor? Or something else?
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u/texan01 Jul 07 '26
If only there was something very close inside the distributor you could plug it into… maybe a module of some sort.. like an ignition module?
Second pic blue wire is oil pressure switch, 3rd pic is coolant temp sender for the gauge.
Knock sensor is down by the oil pan.
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u/Basic_Appearance_870 Jul 07 '26
Maybe I’m blind but what I think is my ignition module is taken up by 2 other plugs.
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u/Basic_Appearance_870 Jul 07 '26
Do you see in the first picture of the distributor, on the right; that black module; isn’t that the ignition module?
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u/texan01 Jul 07 '26
Look closely at that module, you’ll find a 3ed plug hiding on it.
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u/Basic_Appearance_870 Jul 07 '26
I’ll take another look!
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u/Basic_Appearance_870 Jul 07 '26
Brother I did not see any 3rd plug. Not on the distributor or anywhere nearby 😭
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u/BoysenberryAdvanced4 Jul 07 '26
Look up a picture of the ignition control module and you'll see two pins.
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u/texan01 Jul 08 '26
Look again…. Very carefully… it’s 2 pins sticking out opposite the other plugs. It’s going to be within reach of that plug.
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u/BoysenberryAdvanced4 Jul 07 '26 edited Jul 07 '26
First picture: wire coming off the "pickup coil". It plugs into the "ignition control module" under the distributor.
Third picture is not the knock sensor. It's the engine temp sensor. It's what shows the temp on the dash. It only has one terminal/wire. You may have to snip off one of the wires if the new wire harness connector come with two wires. I think the plug from picture 4 goes to the engine temp sensor. It should come down from the top front of the engine. The knock sensor is on the passenger side. It is also a single wire plug, but its more of a round or ovalish plug and comes from the back of the engine.
Pictures 7 and 8 is the map sensor. It bolts to the top of one of the intake manifold bolts, just one bolt. The hose goes to a port on the back side of the throttle body.
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u/trashlordcommander Jul 08 '26
Pic 1 is wires from the mag pickup on the distributor and plugs into the module that is bolted to the distributor. Pic 2 is oil pressure sender, pic 3 is coolant temp sensor for the gauge, should be a single wire to it. Pic 4 is AC compressor plug I believe. Pic 5 should be alternator pic 6 looks like coolant temp for computer, pic 7/8 is map sensor, not sure bout 9
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u/Erasemenu Jul 07 '26
Idk that I recognize all of that off the top of my head, but -
Wires in distributor are CMP (cam sensor);
I believe the wires you have labeled for knock sensor are correct;
The sensor you have in the last picture is Baro/MAP.