Cylinder #1 Misfire
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It probably only happens when your engine is cold because when your engine warms up everything expands with heat and that might be just enough to prevent the misfire. I'd be inclined to follow the good advice that's been given in previous posts, that should see you getting rid of your irritating misfire.
Sounds like mine when I had a cracked plug causing blowout. But if you already checked sparks and coils that it's more likely a cracked ring or other major engine problem. It's almost amusing how many times people think their injectors are bad and almost NEVER is an injector the cause of the issue in the end.
I guess I'll try the unplugging my ecu and testing out the ohms resistance on the injectors for starters
no he said plug but that dosnt make sense if you already changed it.
So you think I have a cracked ring ? I did a compression test and it was around 165,170 I Beleive when I checked . The cars idle isn't irraatic and it still drives and pulls hard threw out all gears .
I guess I'll try the unplugging my ecu and testing out the ohms resistance on the injectors for starters
I guess I'll try the unplugging my ecu and testing out the ohms resistance on the injectors for starters
I'm outside doing the injector ohm test , I do t know which fuse your talking about ? Is it engine control inj on the upside ^ of the kick panel ? And I keep my battery connected while removing the ecu? Is there any procedures in which I should follow when reinstalling it (ecu)? Thanks
key off is fine, that means your injectors are good you dont need power or ground going to anything since your just testing the wiring and injector itself, when injectors start to go bad the resistance increases alot. thats all you want to know is if the wiring is broken(if you get a reading its not since a broken wire would show OL or open line on a multimeter) and how easily electricity flows through. all an injector is, is a larger length of wire wrapped around the core repeatedly to make a solenoid to open and close they arnt that complicated honestly.
what did the plug you took out look like? hate to say it but there is a possibility that someone dropped the new one and its bad too, parts store people arnt that careful alot of times.
arnt you glad you didnt pull the intake? lol
what did the plug you took out look like? hate to say it but there is a possibility that someone dropped the new one and its bad too, parts store people arnt that careful alot of times.
arnt you glad you didnt pull the intake? lol
Last edited by jerryd87; Oct 20, 2013 at 02:49 PM.
key off is fine, that means your injectors are good you dont need power or ground going to anything since your just testing the wiring and injector itself, when injectors start to go bad the resistance increases alot. thats all you want to know is if the wiring is broken(if you get a reading its not since a broken wire would show OL or open line on a multimeter) and how easily electricity flows through. all an injector is, is a larger length of wire wrapped around the core repeatedly to make a solenoid to open and close they arnt that complicated honestly.
what did the plug you took out look like? hate to say it but there is a possibility that someone dropped the new one and its bad too, parts store people arnt that careful alot of times.
arnt you glad you didnt pull the intake? lol
what did the plug you took out look like? hate to say it but there is a possibility that someone dropped the new one and its bad too, parts store people arnt that careful alot of times.
arnt you glad you didnt pull the intake? lol
Haha yes I am lol but to be honest I don't think my meter is working properly . I'm actually an apprentice to be an electrician and can prob get my hands on a better multi meter . Btw I can't Beleive how small the pinouts are on the Z's ecu , I'm used to working with and around 240s lol . Ok so tomorrow I will pull the plug and post pics when I get home from work . If the plug isn't the culprit , what else could it be ? Thanks a lot jerryd , I think you've answered so e of my questions in the past and just wanted to say thanks for taking the time out to help a fellow Z owner out .
honestly i wouldnt be sure, if its only the one cylinder fuel either isnt getting there properly or spark is breaking up be it coil or plug, you could also try regapping the plug. its number 2 so you didnt switch the coil plugs although thats what it really sounds like(common to switch 4 and 6), and it not likely to be the VVT solenoid since it would be the entire bank malfunctioning.
Yea it's only cylinder 2 . Ya know what's funny I'm actually friends with the parts guy at nissan and he said to use oem nissan plugs only . Which plugs do you suggest and at what gap ? Do you use oem? Or .... From what I recall I replaced this one a few months back with an ngk after researching . And at what gap should they be at ? I've been driving like this for just about a year now since it has no effect ( that I know of ) on drivability and performance for a 97,000 mile care .
lol a plug is a plug some are better in terms of quality but nothing special about em. i use LFR6AIX-11 NGK's gapped at .030, but im heavily boosted.
so this isnt affecting performance at all? if thats the case i wouldnt even worry about it it could just be some random *** thing that happens sometimes. how did you determine its cylinder 2? code reader?
so this isnt affecting performance at all? if thats the case i wouldnt even worry about it it could just be some random *** thing that happens sometimes. how did you determine its cylinder 2? code reader?
Last edited by jerryd87; Oct 20, 2013 at 04:48 PM.
Yea with a crummy autozone style one nothing crazy lol . I'm just hoping it's not serious since I don't want to use the couple of bucks I have ready to get my suspension in order this week but alright I'll check back in tomorrow hopefully if I have enough time after work with a picture of the plug from cylinder 2 along with cylinder 1 for a comparrison
To further my previous comment, a slight idle misfire seems common. My G always did it when stock and before I went from 440cc to 600cc injectors and retune. My Z does it as well with 440's and UTEC. However, neither ever threw misfire codes unless there was a more serious problem like bad plugs or coil packs.
Cylinder 2( missfire )
Cylinder 4( comparison )
Cylinder 2(left) cylinder 4 (right)
Any ideas ? They both don't smell like gas or oil ?
Last edited by NOLAGG; Oct 22, 2013 at 12:55 PM.
they dont look too awful but getting close. kinda hard to see but oddly enough #4 seems like it might have a bit more deterioration. when you swapped plugs did you just swap from one cylinder to another? i would try all new plugs then since not are looking too aweful hot