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Author Topic: Need a wiring harness  (Read 167 times)

Offline Aj Nyland

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Need a wiring harness
« on: Apr 07, 2022, 01:27:41 am »
Hey my 85 celica gts only has 2 cylinders working while the other two aren’t I’m pretty sure it’s a wiring harness issue but if y’all now other things that have caused this please tell me and if any of y’all have a wiring harness I could buy please also tel me
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Offline cmtremor

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Re: Need a wiring harness
« Reply #1 on: Apr 07, 2022, 02:14:04 pm »
i have a engine harness intact for a 85 gts if needed
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Offline twotone_ra64

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Re: Need a wiring harness
« Reply #2 on: Apr 07, 2022, 03:47:52 pm »
Quote from: Aj Nyland on Apr 07, 2022, 01:27:41 am
Hey my 85 celica gts only has 2 cylinders working while the other two aren’t I’m pretty sure it’s a wiring harness issue but if y’all now other things that have caused this please tell me and if any of y’all have a wiring harness I could buy please also tel me

Well, what factors led to you thinking its a wiring issue when you looked into it? Data is helpful. :)
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Celica the '84 Two-tone RA64 - Phase 2 In Progress! (159k); 1UZ-FE V8 Swap, W58 5-speed swap, Koni x Swift x T3 suspension, 6G Celica seat belts, TRD 2-way LSD, Corolla tape deck
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Offline ozzie

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Re: Need a wiring harness
« Reply #3 on: Apr 10, 2022, 05:00:54 pm »
I agree. Harness issues aren't usually a problem on these cars. The only thing I can think of in the engine harness that would cause 2 cylinders to fail is if one of the 2 injector ground wires broke off the terminal. IIRC that terminal is bolted onto one of the bolts holding the upper and lower intake manifold halves together. It should be relatively obvious, it's a ring terminal that has 2 places for wires to connect, and IMO the most likely place to break would be at the terminal.
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'84 Celica GT - 261k mi

Offline Aj Nyland

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Re: Need a wiring harness
« Reply #4 on: Apr 25, 2022, 07:45:41 pm »
Quote from: ozzie on Apr 10, 2022, 05:00:54 pm
I agree. Harness issues aren't usually a problem on these cars. The only thing I can think of in the engine harness that would cause 2 cylinders to fail is if one of the 2 injector ground wires broke off the terminal. IIRC that terminal is bolted onto one of the bolts holding the upper and lower intake manifold halves together. It should be relatively obvious, it's a ring terminal that has 2 places for wires to connect, and IMO the most likely place to break would be at the terminal.
Thanks ill definitely look into that today
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Offline 1933beer

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Re: Need a wiring harness
« Reply #5 on: Apr 25, 2022, 11:33:06 pm »
Knod lights can help. I hand a broken wire on my 87 supra.ithe breake was on the 3rd cylinder. Not on the cylinder that   it shares a spark with it helped me locate it to a small part of the harness. I am not sure how the 22r ecu works with the firing  but if the 2 cylinders that dont work may have something in common to help narrow it down.
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