02-14-2023, 11:36 AM
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#1
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Engine turned off after I took of the radiator cap.
Hello,
Need your help asap.
Earlier today I was adding coolant to the radiator since it had been leaking and was hoping to get another today. I might have forgotten that the engine was running, so I took the radiator cap to add more and the engine lost power and turned off. Now the vehicle won’t start. Is there something I should do? Could I have damaged something in this process? I’ve been looking online and haven’t come across anything.
Thanks in advance.
Quick update:
Located the fuel pump under the seat and hit on it with a flashlight. It started!
Looks like it was just clogged.
I’m going to need to replace it soon.
How long do y’all reckon I could drive it around until it fails completely?
Last edited by Madarasskishbosh; 02-14-2023 at 10:58 PM.
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02-14-2023, 11:50 AM
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#2
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Elite Member
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Join Date: May 2017
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Real Name: Jon
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Quote:
Originally Posted by Madarasskishbosh
Hello,
Need your help asap.
Earlier today I was adding coolant to the radiator since it had been leaking and was hoping to get another today. I might have forgotten that the engine was running, so I took the radiator cap to add more and the engine lost power and turned off. Now the vehicle won’t start. Is there something I should do? Could I have damaged something in this process? I’ve been looking online and haven’t come across anything.
Thanks in advance.
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You dump antifreeze in your oil and seize the engine? Or you seize the engine by running it past H?
As that's the only way I see an engine seizing from what you are explaining .
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02-14-2023, 11:57 AM
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#3
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I was just adding coolant to the radiator. Put the radiator cap on and took it off again hoping to put some more. As soon as I took it off the engine lost power and the vehicle turned off. Honestly, I do not know what I was thinking opening the radiator while it was running.
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02-14-2023, 12:01 PM
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#4
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Quote:
Originally Posted by Madarasskishbosh
I might have forgotten that the engine was running, so I took the radiator cap to add more and the engine lost power and turned off.
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I'm a bit curious about this scenario, it's not like the engine isn't inches away, and the fan is spinning, and it's making a lot of noise. How could you forget? Ah well, you did it, either way.
Quote:
Now the vehicle won’t start. Is there something I should do? Could I have damaged something in this process? I’ve been looking online and haven’t come across anything.
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It's very unlikely that the two things are related. The engine will happily run with no pressure in the cooling system, the ECU doesn't even know what the pressure is, only the temp. And it won't shut the engine off if it's too high (or low, or the sensor if shorted or open circuit). It might alter the mixture enrichment some based on what the sensor says the engine is doing.
Did coolant spray out and back onto the running engine in any significant amount? It's faintly possible that could have shorted something out. But generally, the engine can run with water getting doused on it (like when you're driving in the rain).
Was it really low on coolant before this and eventually overheated and was in the process of seizing up when you took the cap off? Did it just happen to run out of gas at the same time?
But no, there's probably no direct connection between you taking the cap off and the engine dying. You'd need to start troubleshooting with the basics. Air, spark, fuel.
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02-14-2023, 12:07 PM
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#5
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Quote:
Originally Posted by JohnMc
I'm a bit curious about this scenario, it's not like the engine isn't inches away, and the fan is spinning, and it's making a lot of noise. How could you forget? Ah well, you did it, either way.
It's very unlikely that the two things are related. The engine will happily run with no pressure in the cooling system, the ECU doesn't even know what the pressure is, only the temp. And it won't shut the engine off if it's too high (or low, or the sensor if shorted or open circuit). It might alter the mixture enrichment some based on what the sensor says the engine is doing.
Did coolant spray out and back onto the running engine in any significant amount? It's faintly possible that could have shorted something out. But generally, the engine can run with water getting doused on it (like when you're driving in the rain).
Was it really low on coolant before this and eventually overheated and was in the process of seizing up when you took the cap off? Did it just happen to run out of gas at the same time?
But no, there's probably no direct connection between you taking the cap off and the engine dying. You'd need to start troubleshooting with the basics. Air, spark, fuel.
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It could have ingested the coolant he just poured in and stalled.
Pull some spark plugs
Check for spark
See if any plugs are wet with coolant or smell of gas.
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02-14-2023, 12:10 PM
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#6
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I guess it depends on where they actually poured the coolant. Or a severely blown HG?
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'99 Highlander 5-spd manual e-locker no-running-board
SS 3" suspension lift/1" body lift/33" tires/'Snowflake' TRD Taco wheels/231mm Tundra brakes/bumpers/armor/sliders/winch/Sherpa Matterhorn rack
Manual front hubs, NWF Eco-crawler transfer case doubler, second gas tank
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02-14-2023, 01:04 PM
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#8
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It does attempt to start. You could say it starts (faintly) but then immediately shuts off again.
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02-14-2023, 01:05 PM
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#9
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Quote:
Originally Posted by JohnMc
I'm a bit curious about this scenario, it's not like the engine isn't inches away, and the fan is spinning, and it's making a lot of noise. How could you forget? Ah well, you did it, either way.
It's very unlikely that the two things are related. The engine will happily run with no pressure in the cooling system, the ECU doesn't even know what the pressure is, only the temp. And it won't shut the engine off if it's too high (or low, or the sensor if shorted or open circuit). It might alter the mixture enrichment some based on what the sensor says the engine is doing.
Did coolant spray out and back onto the running engine in any significant amount? It's faintly possible that could have shorted something out. But generally, the engine can run with water getting doused on it (like when you're driving in the rain).
Was it really low on coolant before this and eventually overheated and was in the process of seizing up when you took the cap off? Did it just happen to run out of gas at the same time?
But no, there's probably no direct connection between you taking the cap off and the engine dying. You'd need to start troubleshooting with the basics. Air, spark, fuel.
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Thank you. Will have it looked at by a mechanic.
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02-14-2023, 01:08 PM
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#10
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Quote:
Originally Posted by JohnMc
I'm a bit curious about this scenario, it's not like the engine isn't inches away, and the fan is spinning, and it's making a lot of noise. How could you forget? Ah well, you did it, either way.
It's very unlikely that the two things are related. The engine will happily run with no pressure in the cooling system, the ECU doesn't even know what the pressure is, only the temp. And it won't shut the engine off if it's too high (or low, or the sensor if shorted or open circuit). It might alter the mixture enrichment some based on what the sensor says the engine is doing.
Did coolant spray out and back onto the running engine in any significant amount? It's faintly possible that could have shorted something out. But generally, the engine can run with water getting doused on it (like when you're driving in the rain).
Was it really low on coolant before this and eventually overheated and was in the process of seizing up when you took the cap off? Did it just happen to run out of gas at the same time?
But no, there's probably no direct connection between you taking the cap off and the engine dying. You'd need to start troubleshooting with the basics. Air, spark, fuel.
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No, coolant did not spray on the engine.
It was a cold start, had been running for a few minutes only and still had coolant in the system (not significantly low). Gas is at half tank.
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02-14-2023, 05:23 PM
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#11
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Do you have fuel in the tank? Clogged fuel filter?
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02-14-2023, 11:01 PM
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#13
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Quote:
Originally Posted by nissanh
Do you have fuel in the tank? Clogged fuel filter?
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Turns out this was it. Hit on the pump and it started right up.
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02-15-2023, 11:10 AM
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#15
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The pump is inside the tank, what did you hit?
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'99 Highlander 5-spd manual e-locker no-running-board
SS 3" suspension lift/1" body lift/33" tires/'Snowflake' TRD Taco wheels/231mm Tundra brakes/bumpers/armor/sliders/winch/Sherpa Matterhorn rack
Manual front hubs, NWF Eco-crawler transfer case doubler, second gas tank
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