help 1990 300zx motors knocking

[me91]

Hey I'm nee to this site and having some problems with
My 1990 300zx so if any one could help I would really appreciate it

I have a knock coming from the motor but when I
Unplug the connection on the coil pack for the
#1 cylinder it stops also it doesn't nock at idle only
When you give it gas..... Also Its misfiring on #1 cylinder
Any suggestion or advice on what's goin on

here a video of the noise

http://youtu.be/1BgoNjRqzHI

[t.mcginley.jr]

If you do anything and the noise stops, then it isn't rod knock. Real knocking doesn't go away without rebuilding the engine, so if you unplugged the coil and it it stopped then it isn't knock. Post up a video of the noise, it will be easier for us to tell you whats going on.

And for the misfire, your injectors are probably going bad. Pre-1992 cars had old style injectors that are prone to failure due to the ethanol in today's gas. The best option is to upgrade to new style injectors, they sell a conversion kit for ~$100. If you look at your injectors, you can tell if they are old or new style, old ones had square connectors and new ones have oval connectors.



Don't pay attention to the color, but you can see where the connector part is different between the two. You can Ohm test your injectors with a multimeter, each one should be between 10 and 14 ohms.

[me91]

Thanks I'll be putting every thing back together after while and can get a video

But it didn't start doin in till after I changed the crank seal so I got it all torn back down
Again thinkin my timing belt may have skipped a tooth after i replaced it but that didn't happen I think it may be a lifter tick but I'm not sure so hopefully I can post a video on here in a few hours

[me91]

here is a link to see the noise on you tube again any help or advice would be nice



http://youtu.be/1BgoNjRqzHI