zerofz10
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Registered: Dec 9, 2023 17:32:49 GMT -7
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Post by zerofz10 on Dec 9, 2023 17:37:23 GMT -7
Itll crank but wont start. I bought new injectors because itll start on ether but dies right away. Fuel pump is working fine. Im at an absolute lose at what could be preventing it from starting. US model, new ignition so its not equipped with the immobilizor. Anything guys??
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zerofz10
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Posts: 8
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Registered: Dec 9, 2023 17:32:49 GMT -7
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Post by zerofz10 on Dec 9, 2023 19:38:44 GMT -7
Itll crank but wont start. I bought new injectors because itll start on ether but dies right away. Fuel pump is working fine. Im at an absolute lose at what could be preventing it from starting. US model, new ignition so its not equipped with the immobilizor. Anything guys?? update: sprayed fuel and it started, stayed on longer then shut off, tested the fuel pump again, it pumped out fuel. Still wont start |
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boilovepho
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Post by boilovepho on Dec 10, 2023 15:23:26 GMT -7
hm. how much miles it got? any major modifications done? flash? battery good?
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Post by willl84 on Dec 11, 2023 3:20:36 GMT -7
Itll crank but wont start. I bought new injectors because itll start on ether but dies right away. Fuel pump is working fine. Im at an absolute lose at what could be preventing it from starting. US model, new ignition so its not equipped with the immobilizor. Anything guys?? update: sprayed fuel and it started, stayed on longer then shut off, tested the fuel pump again, it pumped out fuel. Still wont start How much fuel pressure though? You'll need to check that. How many miles? When were the plugs last changed? Manual says to replace them every 12k. My guess is not enough fuel pressure though - weak pump, clogged filter, etc. Is it a Cali model? If so it'll have a charcoal canister for emissions. If the tank was overfilled it'll leak into that and cause a rich condition and not want to start. |
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zerofz10
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Post by zerofz10 on Dec 11, 2023 7:50:01 GMT -7
hm. how much miles it got? any major modifications done? flash? battery good? 7597miles no modifications brand new battery |
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zerofz10
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Post by zerofz10 on Dec 11, 2023 7:51:28 GMT -7
update: sprayed fuel and it started, stayed on longer then shut off, tested the fuel pump again, it pumped out fuel. Still wont start How much fuel pressure though? You'll need to check that. How many miles? When were the plugs last changed? Manual says to replace them every 12k. My guess is not enough fuel pressure though - weak pump, clogged filter, etc. Is it a Cali model? If so it'll have a charcoal canister for emissions. If the tank was overfilled it'll leak into that and cause a rich condition and not want to start. Fuel pump is running good, sparks are fine. 7597miles so this shouldnt be happening. And no not a Cali model |
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Post by willl84 on Dec 12, 2023 6:49:57 GMT -7
How much fuel pressure though? You'll need to check that. How many miles? When were the plugs last changed? Manual says to replace them every 12k. My guess is not enough fuel pressure though - weak pump, clogged filter, etc. Is it a Cali model? If so it'll have a charcoal canister for emissions. If the tank was overfilled it'll leak into that and cause a rich condition and not want to start. Fuel pump is running good, sparks are fine. 7597miles so this shouldnt be happening. And no not a Cali model Running good doesn't mean good pressure. If the pressure is too low it'll cause issues. If it's starting off of fluid then it's not an ignition issue and if it runs period it's not a compression issue so that leaves fuel. Low pressure, stuck/clogged injectors, etc. There really isn't much else. I'm assuming no CEL as you haven't mentioned it, am I correct? |
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zerofz10
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Post by zerofz10 on Dec 12, 2023 13:57:29 GMT -7
Fuel pump is running good, sparks are fine. 7597miles so this shouldnt be happening. And no not a Cali model Running good doesn't mean good pressure. If the pressure is too low it'll cause issues. If it's starting off of fluid then it's not an ignition issue and if it runs period it's not a compression issue so that leaves fuel. Low pressure, stuck/clogged injectors, etc. There really isn't much else. I'm assuming no CEL as you haven't mentioned it, am I correct? CEL only pops up briefly when ignition turns on. And the injectors are new so shouldnt be clogged. I can hear them spray into throttle body. Ill check pressure. thanks |
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Post by RedAndBlack on Dec 12, 2023 18:22:44 GMT -7
Did it sit for a while? Mix some new gas in.
Hard to imagine it isn't something simple at such low mileage.
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zerofz10
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Post by zerofz10 on Dec 12, 2023 19:12:38 GMT -7
Did it sit for a while? Mix some new gas in. Hard to imagine it isn't something simple at such low mileage. Sat for a year. I drained the old gas, did oil change, filled it with brand new gas |
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Post by RedAndBlack on Dec 12, 2023 23:34:13 GMT -7
Some fuel stabilizer couldn't hurt. Something seems like it fouled up. Maybe check/replace fuel filter.
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Post by willl84 on Dec 13, 2023 4:36:00 GMT -7
replied to your PM
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travis
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Post by travis on Dec 23, 2023 19:12:28 GMT -7
I was just watching a youtube video today of a mechanic who was diagnosing a similar condition on a Corvette. Would run for a minute and stall. With a diag scope, he tested crank position sensor, cam position sensor, fuel injectors, power, ground, everything checked out. Close examination of some fuel injector pulses lead to the discovery of the ECU sporadically resetting itself. Turned out the owner had some battery trouble prior to the no run condition and it seems that the ECU was damaged somehow. Reverse polarity? Voltage spike? Nobody knows.
Replacing & reprogramming the ECU fixed the issue on that one.
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Post by mindcrime79 on Dec 24, 2023 11:05:00 GMT -7
I like the effort and the theory here, Travis, but you are comparing crappy American engineering to fine Japanese quality engineering. I suppose ecu damage is possible but there are fuses and other safeties in place to prevent voltage spikes and such. I guess it wouldn't hurt for the OP to try another ecu and give it a go. There's one on eBay for $250.
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Post by willl84 on Dec 26, 2023 6:00:26 GMT -7
I like the effort and the theory here, Travis, but you are comparing crappy American engineering to fine Japanese quality engineering. I suppose ecu damage is possible but there are fuses and other safeties in place to prevent voltage spikes and such. I guess it wouldn't hurt for the OP to try another ecu and give it a go. There's one on eBay for $250. On that note check all the fuses first! |
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Post by mindcrime79 on Dec 26, 2023 23:57:48 GMT -7
Did you check the main fuse and/or the electronic throttle valve fuse?
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zerofz10
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Post by zerofz10 on Dec 30, 2023 10:41:37 GMT -7
So found out it was the ECU and the ignition now being paired. So i have to reprogram it. When the old ignition was taken out it fried the chip in it so it went into limp mode. Gonna bring it to yamaha to get reprogrammed, thank you all for the help
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Post by mindcrime79 on Dec 31, 2023 5:29:55 GMT -7
I was just watching a youtube video today of a mechanic who was diagnosing a similar condition on a Corvette. Would run for a minute and stall. With a diag scope, he tested crank position sensor, cam position sensor, fuel injectors, power, ground, everything checked out. Close examination of some fuel injector pulses lead to the discovery of the ECU sporadically resetting itself. Turned out the owner had some battery trouble prior to the no run condition and it seems that the ECU was damaged somehow. Reverse polarity? Voltage spike? Nobody knows. Replacing & reprogramming the ECU fixed the issue on that one. Travis for the win. Nice work. I wouldn't have guessed an ecu. |
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Post by willl84 on Jan 2, 2024 4:39:18 GMT -7
So found out it was the ECU and the ignition now being paired. So i have to reprogram it. When the old ignition was taken out it fried the chip in it so it went into limp mode. Gonna bring it to yamaha to get reprogrammed, thank you all for the help I'm guess that you're not in the US then and have an immobilizer, correct? That makes sense. Strange it would have fried anything though. I've had my ECU in and out a bunch of times and no issues. Glad you found the cause though. |
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zerofz10
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Post by zerofz10 on Jan 17, 2024 6:36:10 GMT -7
So found out it was the ECU and the ignition now being paired. So i have to reprogram it. When the old ignition was taken out it fried the chip in it so it went into limp mode. Gonna bring it to yamaha to get reprogrammed, thank you all for the help I'm guess that you're not in the US then and have an immobilizer, correct? That makes sense. Strange it would have fried anything though. I've had my ECU in and out a bunch of times and no issues. Glad you found the cause though. Nope its a US model, but the old ignition got cut out and it shorted the chip |
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