Ignition issue 87 N/A

jetjock

jetjock

creepy-ass cracka
Jul 11, 2005
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Redacted per Title 18 USC Section 798
While running a more solid ground from the intake to battery negative is a good thing you'll still need to test between there and ground at the ECU to eliminate wiring as the cause. I feel your problem is on the positive side though.

In response to your PM of course a positive jumper is going to arc if grounded. The solution is simple: don't ground it. Frankly if you're prone to making such mistakes you ought not to be doing this stuff. However putting a smallish fuse at the jumper end where it connects to the 12 volt supply will usually prevent damage.
 
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NiGMa

New Member
May 4, 2007
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Australia
Ok, so I added some bypass wiring from the main relay to the positive wiring on the ecu connector. and the ground as well, and guess what???

It solved the non-starting problem!!! finally!!!

Though it still cranks for a little bit, but then fires up and runs great! =) =) =)

I am still getting a code 11, interestingly enough, maybe I need thicker gauge wires???

I would never have thought the computer could've caused the problems I was having.
 
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NiGMa

New Member
May 4, 2007
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jd_kittle05;1344048 said:
Mine seems to be doing the exact same thing. So what exactly did you do to fix it?
Click to expand...

Thats actually good to hear in a strange kind of way, I was thinking that I couldn't possibly be the only person with this kind of problem.

What solved it was adding extra "jump" wires to the ECU. I tapped into the B1(positive) line at the connector to the ECU, and took this wire all the way to the main relay. I was looking at a wiring diagram that I know is correct for my car so I don't know if the colours/connections would be the same for your supra.

I also added extra "jump" wires from the ECU negative to nearby ground points.
 
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NiGMa

New Member
May 4, 2007
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Australia
Its the brown (BR) wire mate.

An update on my situation, a wire must have come loose because all of a sudden I am experiencing the same problem again. But it worked perfect for 2 weeks, where it definately should've happened and it didn't. I will get some thicker wire and do it again.

Are you guys getting a code 11 also?
 
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NiGMa

New Member
May 4, 2007
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Gday all. Got some final news on this long saga of mine.

The rewiring solution I last mentioned only worked for two weeks then it was back to the same old problem. I was sure I had finally solved it.

I now have finally solved it and no longer have the problem at all!!!! very yay!

The cause of the problem was....

drum roll...
......
......

the MAIN RELAY!!!!

Yep!

I had a mate come over to help me nut out the problem. Its a hard problem to diagnose, because you only have that 10min window where the problem occurs to do your testing... not easy

I thought it was the wiring to the ECU because thats where everything pointed with the code 11, and in a way it was true, because the main relay was part of the circuit I rewired. I now think the reason it worked for two weeks is because I bumped the relay around enough when redoing the wiring that it made it work better!!!!

When we were testing things, I was explaining that i redid the wiring and mentioned the main relay was on the circuit, but I didn't think it was that because I had tested it as per the TSRM. But when my friend had a look at it he touched it and it was very hot, a sign of high resistance, which is a sign of bad circuitry/faulty component. He gave it a good shake and the car started up right away! Wow!

So, its been about a month and I have not experienced the problem at all! I've got a new relay from toyota and so it should last another 2009-1986.5=22.5 years, lol.

I feel like making a new post describing the problem and solution because if my relay just died and it is one of the oldest MKIII supras around, then surely later everyone else will be running into this problem, plus I live in Australia and the extreme weather here would have made my relay age faster.

I am surprised that no one on here suggested anything like checking the relay, it seems to obvious now, but I guess things always look like that in hindsight. Anyways, thats all folks.
 
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