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Everything posted by jalexquijano

  1. I recently carried out a compression test on my 240z engine and the result was perfect. Nevertheless, last sunday i left the car idling with the Hood open for 10 to 12 minutes and the engine started to idle roughly. I then decided to drive the car and the engine started missing at 2nd and 3rd gear. Surprise, when i got home i pulled spark plug 3 and 4 and both were black fouled. The other ones looks okay. If i already changed the spark plug wires, cap and rotor and the compression is good what could be causing this? Should i use some nose pliers to tighten the terminals?
  2. I recently installed a 1761 Pertronix module and 1.5 coil with ballast resistor in my 1972 240z. I also decided to change the 4 year old battery with a Brand new 500 amp battery. After all of these changes i am now noticing that the tach needle is fluttering when the car is sitting on idle. Is this normal? If not, how can it be solved?
  3. Problem solved. It was the Pertronix Ignitor Module. I had one spare lying around, replaced it and it no longer seems to affect the tach needle. Is this common with Pertronix ignitor?
  4. The weird thing is that the tach needle only flutters at idle when the car has been warmed and driven. At initial warm up it remains quite steady. Any other remedy?
  5. My 240z is sputtering, coughing and misfiring during the first 15 minutes since cranked. Is this normal? I have to run it with the choke lever pulled until the temp reaches to half of the temp gauge. After that it runs rough. I have cleaned all the plugs to see if it solves the problem. Airtex 8012sx electric fuel pump is just pushing 3.2 psi. Coud this be the cause of the symptoms addressed?
  6. jalexquijano

    Sputtering, coughing and misfiring on 1972 240z

    The FSM states 3.4 to 4.2 psi.
  7. jalexquijano

    Sputtering, coughing and misfiring on 1972 240z

    Float level set at .55 inches.
  8. jalexquijano

    Sputtering, coughing and misfiring on 1972 240z

    Twin SU Carb. Float level was already set to .55 inches. Pertronix Ignitor module with pertronix flamethrower coil. I am even getting intake backfire with the both idle mixture knobs set to 3.70 turns clockwise. No vacuum leaks.
  9. After watching the just su dvd produced by ztherapy i was wondering where can i get a ruler to neasure the 9/16 or .55 mm gap needed for the floats. How would you get a precise measurement?
  10. .55 inch with or without pressing the needle valve stem? still not clear!!!
  11. 9/16 drill bit with or without pressing the needle valve pin that shuts the fuel?
  12. jalexquijano

    hitachi float adjust?

    Does the float tang on the 3 screws su carbs touches or presses the needle valve pin? I am still confused how to obtain the precise .55 inch gap on both floats. Nobody seems to clear this out! Ztherapy Just SU DVD dealt with Grose jets and not needle and valve!
  13. My mechanic left the airtex 8012s electric fuel pump on the on position without cranking the engine and now the fuel pressure at the carbs has lowered from 4.3 psi to 3.2. Question? Could the filter that is besides the pump be clogged and thus causing the decrease in psi or could the pump be partially damage due to his negligence on not craking the engine immediately.
  14. Sorry its .55 inches which should be 12mm.
  15. Well when the pump was new the pressure was 4.3 and i had no hesitation or backfire between 3000 to 4500 rpms going from 2nd to 3rd gear.
  16. Its weird i used to have 4.3 psi and now only 3.2. Car hesitates and backfires between 3000 to 4000 rpms. Once i put in a new pump it raises to 4.3 and no more hesitation or backfire.
  17. Which air fuel ratio gauge is recommended to get the precise mixture on my 240z? Innovate??? Which model and brand?
  18. My 1972 240z has stock disc brakes and rear drum brakes. Anyway, the other day i suddenly hit the brakes and even though the car did stop, it did not stopped as my 2012 Honda Crv. I want to obtain the same stopping power as modern cars such as my crv. Should i invest on 4 wilwood disc brake set (2 front and 2 rear) or should i simply purchase the rear disc brakes and calipers? I just want to invest my money wisely.
  19. Just bought a new MSA Premium exhaust for my 1972 240z. Took it to a muffler shop to remove the former stock system and had it installed including the manifold to downpipe gasket and the 2 pipe to pipe gaskets. The kit brings a turbo muffler. The problem is that now whenever i speed up and reléase the car pedal (decelerate) the car pops at the tailpipe. It did not had this deceleration popping in the past with the former system. I was wondering if the gaskets provided by MSA are not of good quality or else?
  20. jalexquijano

    Deceleration popping at exhaust with new MSA Premium exhaust

    How many HP wil i loose?
  21. jalexquijano

    Deceleration popping at exhaust with new MSA Premium exhaust

    popping continues. Im still wondering why it did not popped on deceleration when it had the MSA Twice Pipe system installed. If i decide to go to the stock muffler with resonator how many hp will i loose?
  22. jalexquijano

    Is it really worth upgrading to rear disc brakes on a 1972 240z

    The exhaust popping was never solved. Lowered the fuel mixture or increasing it did not produced any effect. I also lowered the Timing to 11 btdc and increased to 15 btdc and the deceleration popping persists. When i bought the car PO had an MSA twice pipe system installed and it never popped. I guess the pipes dimension with this system are different and the material is Steel instead.
  23. jalexquijano

    Is it really worth upgrading to rear disc brakes on a 1972 240z

    Okay! Upgrade the front disc brakes to which kit and Brand?? You mentioned "fronts to larger caliper and vented rotors"!! But which Brand? I am looking for a bolt in kit.

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