# Nissan 300z misfire **URL:** \ **Category:** Maintenance/Repairs\ **Created:** [June 10, 2008, 10:42pm UTC](https://community.cartalk.com/t/nissan-300z-misfire/15140 "2008-06-10T22:42:01Z")\ **Posts on this page:** 12\ **Page:** 1
**Author:** ![Rotortrash](https://avatars.discourse-cdn.com/v4/letter/r/278dde/32.png) [@Rotortrash](https://community.cartalk.com/u/Rotortrash)\ **Post date:** [June 10, 2008, 10:42pm UTC](https://community.cartalk.com/t/nissan-300z-misfire/15140/1 "2008-06-10T22:42:01Z")
My fiance is having trouble diagnosing a misfire on the second cylinder of his 300z. He has ruled out electrical. Any ideas for us? ---
**Author:** ![the\_same\_mountainbike](https://avatars.discourse-cdn.com/v4/letter/t/c89c15/32.png) [@the\_same\_mountainbike](https://community.cartalk.com/u/the_same_mountainbike)\ **Post date:** [June 10, 2008, 10:44pm UTC](https://community.cartalk.com/t/nissan-300z-misfire/15140/2 "2008-06-10T22:44:36Z")
Sticky injector? ---
**Author:** ![crankwalk5](https://avatars.discourse-cdn.com/v4/letter/c/3e96dc/32.png) [@crankwalk5](https://community.cartalk.com/u/crankwalk5)\ **Post date:** [June 10, 2008, 10:51pm UTC](https://community.cartalk.com/t/nissan-300z-misfire/15140/3 "2008-06-10T22:51:10Z")
more info would be good. that question is WIDE open. what has he done? ---
**Author:** ![Rotortrash](https://avatars.discourse-cdn.com/v4/letter/r/278dde/32.png) [@Rotortrash](https://community.cartalk.com/u/Rotortrash)\ **Post date:** [June 10, 2008, 10:59pm UTC](https://community.cartalk.com/t/nissan-300z-misfire/15140/4 "2008-06-10T22:59:44Z")
nope but thx ---
**Author:** ![Rotortrash](https://avatars.discourse-cdn.com/v4/letter/r/278dde/32.png) [@Rotortrash](https://community.cartalk.com/u/Rotortrash)\ **Post date:** [June 10, 2008, 11:12pm UTC](https://community.cartalk.com/t/nissan-300z-misfire/15140/5 "2008-06-10T23:12:00Z")
He says he has done everything and it all leads him back to square one. He is very frustrated right now so I cant get a real answer other than he even followed up in the FSM, you know, the book that Nissan Tech’s refer to? And it’s not even helping him. ---
**Author:** ![the\_same\_mountainbike](https://avatars.discourse-cdn.com/v4/letter/t/c89c15/32.png) [@the\_same\_mountainbike](https://community.cartalk.com/u/the_same_mountainbike)\ **Post date:** [June 10, 2008, 11:21pm UTC](https://community.cartalk.com/t/nissan-300z-misfire/15140/6 "2008-06-10T23:21:12Z")
Does a “reading” of the spark plugs show any abnormalities on that cylinder? ---
**Author:** ![ok4450](https://avatars.discourse-cdn.com/v4/letter/o/e9bcb4/32.png) [@ok4450](https://community.cartalk.com/u/ok4450)\ **Post date:** [June 11, 2008, 12:02am UTC](https://community.cartalk.com/t/nissan-300z-misfire/15140/7 "2008-06-11T00:02:11Z")
A definition of “ruled out electrical” and “has done everything” would help. How has this been determined, what if anything has been replaced, what codes are being shown, how many miles on the car and what year, etc.? If the car has half a million miles and finally dropped a cylinder due to low compression then one can throw parts at it all day long without solving anything. ---
**Author:** ![Rotortrash](https://avatars.discourse-cdn.com/v4/letter/r/278dde/32.png) [@Rotortrash](https://community.cartalk.com/u/Rotortrash)\ **Post date:** [June 11, 2008, 12:16am UTC](https://community.cartalk.com/t/nissan-300z-misfire/15140/8 "2008-06-11T00:16:03Z")
Its flooded with fuel, plug itself is drenched ---
**Author:** ![Rotortrash](https://avatars.discourse-cdn.com/v4/letter/r/278dde/32.png) [@Rotortrash](https://community.cartalk.com/u/Rotortrash)\ **Post date:** [June 11, 2008, 12:22am UTC](https://community.cartalk.com/t/nissan-300z-misfire/15140/9 "2008-06-11T00:22:27Z")
Power Balance Test Swapped coil packs swapped plugs Check continuities of coil packs Check ohm reading on injectors ohm read PTU ohm read CAS did continuity test between PTU terminals / ECU terminals / Coil harness swapped PTU’s ran ecu codes, no codes did a pulse signal test on dead cyl #2 Its a 1991 with over 95000 miles ---
**Author:** ![Rotortrash](https://avatars.discourse-cdn.com/v4/letter/r/278dde/32.png) [@Rotortrash](https://community.cartalk.com/u/Rotortrash)\ **Post date:** [June 11, 2008, 12:23am UTC](https://community.cartalk.com/t/nissan-300z-misfire/15140/10 "2008-06-11T00:23:15Z")
Power Balance Test Swapped coil packs swapped plugs Check continuities of coil packs Check ohm reading on injectors ohm read PTU ohm read CAS did continuity test between PTU terminals / ECU terminals / Coil harness swapped PTU’s ran ecu codes, no codes did a pulse signal test on dead cyl #2 Its a 1991 with over 95000 miles ---
**Author:** ![the\_same\_mountainbike](https://avatars.discourse-cdn.com/v4/letter/t/c89c15/32.png) [@the\_same\_mountainbike](https://community.cartalk.com/u/the_same_mountainbike)\ **Post date:** [June 12, 2008, 5:55pm UTC](https://community.cartalk.com/t/nissan-300z-misfire/15140/11 "2008-06-12T17:55:02Z")
You checked to see that the signal to the injector was good, but did you try swapping the injector itself? My gut suggests that the inject may be leaking. A single saturated plug where all the ignition items have been checked is a real strong symptom of same. ---
**Author:** ![crankwalk5](https://avatars.discourse-cdn.com/v4/letter/c/3e96dc/32.png) [@crankwalk5](https://community.cartalk.com/u/crankwalk5)\ **Post date:** [June 13, 2008, 12:07am UTC](https://community.cartalk.com/t/nissan-300z-misfire/15140/12 "2008-06-13T00:07:24Z")
compression check? cylender leakdown test? back to basics,(seems that way) good luck.