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HONDA PRELUDE MULTIPLE/RANDOM MISFIRES

Posted in Ignition Systems | Asked on Jun 19, 2010

I have a 2000 Honda Prelude that keeps throwing trouble codes. Code for P0300 random multiple misfire and P1399 Random cylinder misfire. I just replaced the whole ignition system with msd parts: NGK iridium plugs, msd 8.5 mm super conductor wires, msd cap and rotor, msd blaster ss coil, and msd 6al2 cd ignition box. I figured this would solve the problem but it is still occuring. Car seems really sluggish and when the ac is on, I will rev it in neutral and let rpms drop to idle and it almost stalls on itself before barely catching and returning to idle. I have an intake and have recently also replaced brand new oem o2 sensor. I only run premium gas and have checked the plugs gaps multiple times. I baby my car and she keeps throwing the finger… Can anyone HELP???? Please? EGR Valve a possibility? Anything is appreciated. Thank you.

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There are 4 Answers for "HONDA PRELUDE MULTIPLE/RANDOM MISFIRES"

  1. mikrp says:

    engine has jumped timing chain/belt possible bad distributor. check to see if enginge in is time, align timing mark to TDC and see if distributor points to #1 cylinder. slim possibility of bad crank sensor

  2. Theneelster says:

    Iridium plugs are junk…I used to throw codes with them all the time (even the NGKS!) switch back to copper resistor plugs (NGK or Denso)…

    I’ve never dealt with a distributor system but that’s where I’d start. It sounds like an electrical problem (especially the A/C comment) probably related to the distributor or at least the voltage that the distributor is getting. The cheapest thing you could try is a voltage stabilizer (versus swapping alternators and buying a new distributor). It’s voodoo car mechanics and most people say they don’t work for performance but I have one in my car and it does alleviate the electrical issues and rough idle to a decent degree.

  3. misterwizard says:

    clean the egr ports, and check the egr valve for leaks.

  4. evil dude says:

    i have a dodge that was doing this for months couldent figure it out till one day it wouldent run then i did all what you said and still no spark come to find out the timming belt sliped a coulpe notches hope this helps