X Nissan Owner Seeking Answers

[hks33]

Hey all,

It's been some time now since I've been back on the forums. I've recently encountered an issue with my jzx100 I know this isn't the right place to be asking but thought I'd try my luck. Have posted on the jzx forums but nobody is providing me an accurate answer. Thought I'd swing past here and see maybe if someone with a bit more knowledge could point me in the right direction with somewhat of a more accurate response.

Here's a link to my thread on the jzx forums please let me know what you guys think it may be.

http://www.jzx100.com/forum/topic/13904-inconsistent-knocking-from-head-and-rough-idle/

Best regards and looking forwards to your responses.

[Shoota_77]

Could be just the camera amplifying the sound but that sounds bottom end noise to me rather than top end. It has the characteristic bottom end thump as opposed to top end rattle. Very unusual for it to be so intermittent thought.

Extremely hard to tell via a vid. Taken it to a workshop to get someone to check it?

[hks33]

It was definitely knocking coming from somewhere in the head. Got underneath the car to try and listen but couldn't hear a thing.. Ever since I've removed the cam covers and unplugged all the coilpacks and re plugged them back in the noise has stopped. If it was bottom end knocking it still doesn't explain the misfire and it just stopping all of a sudden.

The noise is very faint in the video you can barely hear it as opposed to listening to it in person, Haven't taken it to a workshop yet but leaning towards the ignition system or a crappy batch of 98 ron I purchased from woolworths service station.

The car also seems to idle hunt when holding the accelerator in a fixed position after 10 seconds or so and continues to idle hunt for a few seconds after releasing the accelerator.

[hks33]

Guys from the forums think it also may have something to do with a faulty vvt-i solenoid.

[AngryRB]

Guys from the forums think it also may have something to do with a faulty vvt-i solenoid.

im interested to know whats happened, have you tried a piece of pipe to your ear and place it on the rockers and underneath on the sump, might get closer to the noise,

Id like to know what effect a few cylinders not firing would have on the crank and bearings, some late model cars can shut down individual cylinders but that would be a balanced arrangement.

[hks33]

Since the noise has gone there's been no need to listen with a hose... The car still makes the same power under load but the misfire only occurs under the conditions I've mentioned throughout both of these threads.

[scotty nm35]

I have heard many a VQ make noise from the cam actuation, I wonder if they use the same design for the advance mechanism... They knock within a certain rev range and the noise disappears with the vct unplugged.