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Help!!! Mystery misfire no start when hot not main relay

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Old Jun 12, 2021
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Help!!! Mystery misfire no start when hot not main relay

Hi so the story is that i can drive my 2000 civic honda but after parking and trying to restart it I have much trouble as seen in this video https://youtu.be/8dTBpuEjLew it will take several hours to restart the car and clear misfire. Only codes that come up are the code for random misfire. Any ideas thanks

I already replaced the
  • Intake manifold
  • Map sensor
  • Oxygen sensor 1 and 2
  • Air and fuel filter
  • Main relay for fuel
  • Exhaust manifold and cat converter
  • Muffler
  • Fuel pump
  • Battery
  • Distributor
  • Wires to plug
  • Spark plugs
  • Fuel Injectors
  • Fuel rail
  • Fuel pressure regulator

Last edited by DrivenHonda; Jun 14, 2021 at 06:36 PM.
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Old Jun 12, 2021
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Re: Help!!! Mystery misfire no start when hot not main relay

Its not drivable until the "flood" clears I smell gas and hear the fuel pump prime but it has no power and i was pumping the pedal in video it has no pedal response at all
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Old Jun 12, 2021
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Re: Help!!! Mystery misfire no start when hot not main relay

Solve a fuel flood issue:
Remove the spark plugs, press gas pedal to floor and crank engine to blow gas out of cylinders. Add a tablespoon of oil to each cylinder, reinstall spark plugs, crank with gas pedal to the floor.

Spark, Fuel, Air... are all three present in the cylinders?

It may be leaking fuel injector o-ring seals?
That would cause excessive amounts of fuel in the cylinder(s)
Pull the spark plugs and look and smell for fresh gas on them.
Only way to check injector o-ringsbis to pull the injectors and inspect the prints for tears or dry rot.

Last edited by Wankenstein; Jun 12, 2021 at 08:18 PM.
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Old Jun 13, 2021
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Re: Help!!! Mystery misfire no start when hot not main relay

Originally Posted by HR Puffinblunts
Solve a fuel flood issue:
Remove the spark plugs, press gas pedal to floor and crank engine to blow gas out of cylinders. Add a tablespoon of oil to each cylinder, reinstall spark plugs, crank with gas pedal to the floor.

Spark, Fuel, Air... are all three present in the cylinders?

It may be leaking fuel injector o-ring seals?
That would cause excessive amounts of fuel in the cylinder(s)
Pull the spark plugs and look and smell for fresh gas on them.
Only way to check injector o-ringsbis to pull the injectors and inspect the prints for tears or dry rot.
They were soaked with gas. I have what smells like gas in oil from it flooding.
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Old Jun 13, 2021
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Re: Help!!! Mystery misfire no start when hot not main relay

Originally Posted by DrivenHonda
They were soaked with gas. I have what smells like gas in oil from it flooding.
Not getting proper ratios of air, fuel, spark in cylinders to burn off fuel. Do a power balance (rpm drop) test on it. 1st test: at idle slowly lift the spark plug wire off the spark plug (one cylinder at a time). If spark is good then rpms will drop when the spark wire lead is lifted farther away from the spark plugs. However, if lifting the spark plugs wire lead off the spark plugs doesn't cause an rpm drop then it's a sign of poor spark, poor compression or poor fuel injection. Do this test one cylinder at a time.

Do the same test again except do not remove spark plugs wires. Instead, remove the fuel injector harness one at a time on corresponding cylinder being tested. If rmps drop then fuel injection is good. If rpms do not drop then it's an injector issue Link: balance test ://troubleshootmyvehicle.com/honda/1.6L/how-to-do-a-cylinder-balance-test-1

Last edited by Wankenstein; Jun 13, 2021 at 03:17 AM.
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Old Jun 13, 2021
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Re: Help!!! Mystery misfire no start when hot not main relay

Flooded cylinder causes: https://despairrepair.com/flooded-en...oms-solutions/
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Old Jun 14, 2021
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Re: Help!!! Mystery misfire no start when hot not main relay

Originally Posted by HR Puffinblunts
Not getting proper ratios of air, fuel, spark in cylinders to burn off fuel. Do a power balance (rpm drop) test on it. 1st test: at idle slowly lift the spark plug wire off the spark plug (one cylinder at a time). If spark is good then rpms will drop when the spark wire lead is lifted farther away from the spark plugs. However, if lifting the spark plugs wire lead off the spark plugs doesn't cause an rpm drop then it's a sign of poor spark, poor compression or poor fuel injection. Do this test one cylinder at a time.

Do the same test again except do not remove spark plugs wires. Instead, remove the fuel injector harness one at a time on corresponding cylinder being tested. If rmps drop then fuel injection is good. If rpms do not drop then it's an injector issue Link: balance test ://troubleshootmyvehicle.com/honda/1.6L/how-to-do-a-cylinder-balance-test-1
I replaced all the injectors and the problem disappeared for a day and now its back but not as severe. Should I suspect someone was vindictive with my gas tank?
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Old Jun 14, 2021
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Re: Help!!! Mystery misfire no start when hot not main relay

Originally Posted by DrivenHonda
I replaced all the injectors and the problem disappeared for a day and now its back but not as severe. Should I suspect someone was vindictive with my gas tank?
Did you try the power balance tests yet?
Performed a dry and wet compression test on it?
Always test before replacing parts.

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