Question about 1991 Nissan 300ZX

1 Answer

Engine misfire :(

Ive got a rb26dett engine that shakes on idle, and ive been told by a number of people that im misfiring. I unplugged the coilpacks one at a time and the engine responded by shuddering untill i unplugged the coil on the cylinder closest to the firewall. The engine ran no differently if that coil was disconnected or not. I swapped it with a different coil and it didnt solve it, so the coils are good. I checked the wiring harness and grounds, they seemed ok as well. This has become quite frustrating and i don't know where else to turn, any help would be appreciated 
thanks in advance.
1991 r32 gtr rb26dett 145,000 kms

Posted by on

  • rioman1 Apr 27, 2009

    My engine has been misfiring, I changed the coil and the spark plug but it didn't make a difference. I then went and changed the injector but is still faced with this problem. Any help would be greatly appreaciated. Its a 1992 300zx na

  • Scott Bauer
    Scott Bauer Apr 29, 2009

    hey, it turned out as i was testing/inspecting my injectors, i found that the plug on the injector that was with the misfiring cylinder wasn't clipped in. It was just sitting on top! Once i clipped it in the engine instantly went sound! now she purrs, its like a whole new car. way more fuel efficient and 50+ more hp. I was going to sell the thing but now im having 2nd thoughts... haha thanks for the follow-up



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  • Nissan Master
  • 599 Answers

Put a vacuum gauge on the engine,the needle should fluctuate back and forth, take a timing light and instead of putting on the number one plug put it on the plug wire with the problem.point the light at the gauge if the needle looks like it is steady you have a problem with one of the valves or the cam shaft.

Posted on Apr 22, 2009

  • Ray Keckeisen Apr 29, 2009

    just wondering how you made out get back to me if you need more help Thanks Ray

  • Ray Keckeisen Apr 30, 2009

    glad you found the problem kind of hard for me to diagnose without being there to see the car but i try my best if you ever need more help get back to me,i guess you can't rate my fix but keep this test in mind as it has solved a lot of problems, this is a test from the OLD DAYS. when cars were simpliar but works on any car



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