Does not start, code 41?

1993 TOYOTA COROLLA
347 MILES • 1.6L • 4 CYL • 2WD • AUTOMATIC
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BLUETHUNDY
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Hi, I have the car listed above and it’s throwing code 41 which is a throttle position circuit fault, and I was just wondering if this code could make the vehicle not start as mine won’t start. I tried changing the sensor and it still did nothing.
But it has it has fuel on spark, good compression too.
Dec 9, 2022 at 5:52 AM
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JACOBANDNICKOLAS
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Hi,

If you have spark, fuel, and good compression, the only other thing that would prevent it from running would be engine timing.

Do me a favor. We may not be getting the fuel injectors to actuate. See if the engine starts and then stalls if you use starting fluid. If it does, then we know it is a fuel-related issue.

Also, if you could record it cranking and upload it for me to hear, it may be helpful. Here is a link you may find helpful.

https://www.2carpros.com/articles/car-not-running-advanced

Let me know.

Joe

Dec 9, 2022 at 2:10 PM
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BLUETHUNDY
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Okay, so I checked the timing and it’s all on time and I tried spraying that into throttle body and still nothing.
Dec 12, 2022 at 6:17 AM
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BLUETHUNDY
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Okay so I checked the timing and it’s all on time and I tried spraying that into throttle body and still nothing
Dec 12, 2022 at 6:17 AM
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BLUETHUNDY
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Could you have spark with a bad crank sensor?
Dec 12, 2022 at 6:22 AM
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JACOBANDNICKOLAS
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If the crankshaft position sensor is bad, you shouldn't have spark. Did you check for spark? Just for curiosity, if you have a tachometer, does it move at all when cranking? Also, here is a link that explains how to check for spark. Do this if you haven't.

https://www.2carpros.com/articles/how-to-check-for-ignition-spark

If there was no change when using starting fluid, I suspect you will find there is no ignition spark.

Let me know.

Joe
Dec 12, 2022 at 12:38 PM
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BLUETHUNDY
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Yes, the tachometer does move when cranking it over and I have checked for spark and there is spark at the spark plugs, but when you go to the ignition coil the spark had no gap. when you put a test light near it you have to touch the Ignition coil with test light just to get any spark.
Dec 13, 2022 at 3:03 AM
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BLUETHUNDY
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Could that be a shorted coil?
Dec 13, 2022 at 3:04 AM
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JACOBANDNICKOLAS
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Hi,

If you are getting spark to the plugs, the coil must be working. When you checked the spark at the plugs, is it a blue snapping spark or does it appear white or orange in color? We may have a weak coil.

Let me know.

Joe
Dec 13, 2022 at 11:50 AM
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BLUETHUNDY
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A little orange, is that bad?
Dec 13, 2022 at 2:46 PM
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JACOBANDNICKOLAS
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Hi,

Not that it's bad, but rather, weak. Are the wires to the plugs and at the coil all clean, tight, and free of corrosion or damage?

At the coil, there will be a red wire to the + and a blue wire to the -. With the key on, check for battery voltage to the red wire.

Let me know. Also, let me know how old the spark plugs are.

Joe

See pic below.
Dec 14, 2022 at 12:46 PM
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BLUETHUNDY
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It ended up being the ignition coil had a big crack on the face of it. Thank you for all the advice though.
Dec 15, 2022 at 3:41 AM
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JACOBANDNICKOLAS
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Hi,

Thank you for the update. I had a feeling there was an issue with the coil. I suspected it was a poor connection, loose or corroded. However, a crack absolutely will do it too.

I'm glad to know you have it fixed. Take care and feel free to come back in the future. You are always welcome here.

Joe
Dec 15, 2022 at 9:59 AM
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