Hard start when engine is hot
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Hard start when engine is hot
I am having this issue for a while now and I don't know what to start fixing.
Whenever the engine is hot coming from a ride (maybe for about 30 mins. or an hour) and when I turned off the engine for about 10-15 mins. then try to start again, it is hard starting and worst, not going to start at all. The last time that it didn't start, I have removed the fuse for battery and ignition then put it back again then the car starts.
Newly replaced fuel filter, spark plugs and battery are good, fuel pump is working, main relay is clicking. Though the IACV needs to be replaced but could that be a possible cause?
What do I need to check or replace?
Whenever the engine is hot coming from a ride (maybe for about 30 mins. or an hour) and when I turned off the engine for about 10-15 mins. then try to start again, it is hard starting and worst, not going to start at all. The last time that it didn't start, I have removed the fuse for battery and ignition then put it back again then the car starts.
Newly replaced fuel filter, spark plugs and battery are good, fuel pump is working, main relay is clicking. Though the IACV needs to be replaced but could that be a possible cause?
What do I need to check or replace?
Re: Hard start when engine is hot
You've scanned for codes right?
If you know someone with an obdii scanner, with live data, you can see if the temperature sensor is reading the correct temperature.
if not you can buy one that links to your phone for like $20 on amazon.
"android obdii bluetooth" or "apple obd2 bluetooth"
If you know someone with an obdii scanner, with live data, you can see if the temperature sensor is reading the correct temperature.
if not you can buy one that links to your phone for like $20 on amazon.
"android obdii bluetooth" or "apple obd2 bluetooth"
Thread Starter
Registered!!
Joined: Sep 2019
Posts: 34
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From: Manila, Philippines
Rep Power: 0 
Re: Hard start when engine is hot
You've scanned for codes right?
If you know someone with an obdii scanner, with live data, you can see if the temperature sensor is reading the correct temperature.
if not you can buy one that links to your phone for like $20 on amazon.
"android obdii bluetooth" or "apple obd2 bluetooth"
If you know someone with an obdii scanner, with live data, you can see if the temperature sensor is reading the correct temperature.
if not you can buy one that links to your phone for like $20 on amazon.
"android obdii bluetooth" or "apple obd2 bluetooth"
Thread Starter
Registered!!
Joined: Sep 2019
Posts: 34
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From: Manila, Philippines
Rep Power: 0 
Re: Hard start when engine is hot
Update:
I have the starter overhauled but it didn't solved the problem.
I've noticed that whenever I turn the ignition to ON, and the radiator fan starts to run, the stater won't turn and it's like it's not getting electricity. But if I turn the ignition to ON when the engine is not warm and the radiator fan is not running, the car will start in one click.
How do I solved this? Please help me.
I have the starter overhauled but it didn't solved the problem.
I've noticed that whenever I turn the ignition to ON, and the radiator fan starts to run, the stater won't turn and it's like it's not getting electricity. But if I turn the ignition to ON when the engine is not warm and the radiator fan is not running, the car will start in one click.
How do I solved this? Please help me.
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Re: Hard start when engine is hot
Beyond a fault code you want to see "live date" (as Mac suggested) to see if the temp sensor is emitting the correct voltage.
Also, remove and clean the IACV valve and gasket screen with brake cleaner. Clean the throttle body w/o removing.
Inspect spark plugs for wetness (gas)...possibly leaky fuel injectors?
Emissions systems parts such as failing evaporator solenoid or evaporator hoses can also cause a delayed or no start when engine is warm
Next time it does not start or hard starts at operating temp...press the gas pedal to the floor. This will disable the fuel injectors and allow max amount of air into the cylinders..if it starts let off the gas pedal to idle normally.
Here's a read that may help?: https://honda-tech.com/forums/honda-...ed%5D-3299655/
Also, remove and clean the IACV valve and gasket screen with brake cleaner. Clean the throttle body w/o removing.
Inspect spark plugs for wetness (gas)...possibly leaky fuel injectors?
Emissions systems parts such as failing evaporator solenoid or evaporator hoses can also cause a delayed or no start when engine is warm
Next time it does not start or hard starts at operating temp...press the gas pedal to the floor. This will disable the fuel injectors and allow max amount of air into the cylinders..if it starts let off the gas pedal to idle normally.
Here's a read that may help?: https://honda-tech.com/forums/honda-...ed%5D-3299655/
Thread Starter
Registered!!
Joined: Sep 2019
Posts: 34
Likes: 1
From: Manila, Philippines
Rep Power: 0 
Re: Hard start when engine is hot
Beyond a fault code you want to see "live date" (as Mac suggested) to see if the temp sensor is emitting the correct voltage.
Also, remove and clean the IACV valve and gasket screen with brake cleaner. Clean the throttle body w/o removing.
Inspect spark plugs for wetness (gas)...possibly leaky fuel injectors?
Emissions systems parts such as failing evaporator solenoid or evaporator hoses can also cause a delayed or no start when engine is warm
Next time it does not start or hard starts at operating temp...press the gas pedal to the floor. This will disable the fuel injectors and allow max amount of air into the cylinders..if it starts let off the gas pedal to idle normally.
Here's a read that may help?: https://honda-tech.com/forums/honda-...ed%5D-3299655/
Also, remove and clean the IACV valve and gasket screen with brake cleaner. Clean the throttle body w/o removing.
Inspect spark plugs for wetness (gas)...possibly leaky fuel injectors?
Emissions systems parts such as failing evaporator solenoid or evaporator hoses can also cause a delayed or no start when engine is warm
Next time it does not start or hard starts at operating temp...press the gas pedal to the floor. This will disable the fuel injectors and allow max amount of air into the cylinders..if it starts let off the gas pedal to idle normally.
Here's a read that may help?: https://honda-tech.com/forums/honda-...ed%5D-3299655/
Re: Hard start when engine is hot
Had this problem from new and later engine just stopped intermittently on really hot days.
In the end it turned out to be a faulty TDC sensor which was intermittent with heat soak after stopping engine.
When I replaced the sensor, Honda supplied a different P/n sensor so it was maybe a bad batch.
In the end it turned out to be a faulty TDC sensor which was intermittent with heat soak after stopping engine.
When I replaced the sensor, Honda supplied a different P/n sensor so it was maybe a bad batch.
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