1999 civic starts hard when cold once started runs great once warmed starts great too Have already changed lots of stuff no codes?

Engine starts hard after sitting. Once it starts it runs ok and on rare occasion stalls. Once it’s warmed up it runs great and starts easily. Have recently installed plugs, rotor, distributor cap, wires,fuel filter, purge solenoid and canister vent valve. battery checks good.

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  • 2 years ago

    Every Honda motor has a common problem with the valves getting tight.They need adjusting every 60,000 miles.

    Does it make a difference when cold starting if you hold the gas pedal to the floor?

    Have you checked to see if the timing belt jumped?

    Source(s): Mitsubishi Master Tech
  • Anonymous
    2 years ago

    Clean the IACV. Check fuel pressure while cranking when the engine is cold. Pressure is low, check for power and ground at the fuel pump. Power and ground is good, replace fuel pump. No power, replace the main relay. Pressure is good, replace the igniter (ignition module) and ignition coil. Those three items are common faults of Civics of that vintage.

    You can also check if there is a fuel delivery problem by spraying starter fluid when the engine is cold. If the car starts right away, there is a fuel delivery problem due to bad fuel pump or bad main relay. If the car still has a hard start, check for spark.

  • 2 years ago

    Poor starting is often symptomatic of low compression. Get it checked. Also the battery needs to be in good order. Modern electronic ignitions need a good shot of juice to light up, and your battery may test OK but still not have enough grunt to do the job. Check it gives 12.5V with the engine off.

  • Anonymous
    2 years ago

    1) not sure what you mean by "starts hard"..

    2) why not have a qualified mechanic do an inspection ?? better to spend $ 100 or so that replacing parts that may not need to be replaced

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