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Tech Talk Technical Discussion About The Nissan 240SX and Nissan Z Cars


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Old 03-06-2013, 07:01 PM   #1
headup240
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weird sr20 clicking noise

Ok I know I am constantly asking questions about my sr but the swap is complete and running good now... I just have one more weird issue. At idle there is a clicking noise sometimes near the vtc/tps/1st*injector. The click is completely random and does not match the revs and it only does it under 1k rpm. When it starts clicking it interrupts the idle and drops it to around 600. *** it doesnt do it when I unplug the tps or if the tps is adjusted UNDER .4 volts. Weird problems man.
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Old 03-06-2013, 08:40 PM   #2
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Pop the valve cover off and check and see if the timing chain is hitting the guide on the top
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Old 03-19-2013, 11:19 AM   #3
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Here. So you guys can understand more...

SR20 clicking sound - YouTube
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Old 03-19-2013, 11:35 AM   #4
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fan hitting wire?
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Old 03-19-2013, 11:37 AM   #5
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Quote:
Originally Posted by evilpanamajack View Post
fan hitting wire?
Nah man I have electric fans... and I would notice something like that.
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Old 03-20-2013, 09:31 AM   #6
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Bump still need help with this.
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Old 06-22-2018, 02:01 AM   #7
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Hate to bring up an old thread but any news on if it got fixed, I’m having the same issue
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Old 06-22-2018, 08:21 AM   #8
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Quote:
Originally Posted by Vdubbin32 View Post
Hate to bring up an old thread but any news on if it got fixed, Iím having the same issue
if its a s14/15 motor, the VTC gear will start to rattle when they get old and worn out. might be the issue.
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it'll fit JANK.. and no one likes Jank except Broke ass zilvians.
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Old 06-22-2018, 08:27 AM   #9
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i remember my first tick.

Ah, I was at idle sitting in the driveway. VTC had not been on for a week because I had cut the wire to diagnose something else.

The engine started softly at first. tick tick tick.
It got louder. The car drove fine but the noise sounded like a rod knock now. tack tack tack clack tack.

I freaked out. I called five places about a next engine. I was about to head down to a local place and pick one up when I remembered the VTC wire.

Sigh.
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Old 06-22-2018, 08:36 AM   #10
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so OP fixed now?
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Old 06-22-2018, 08:42 AM   #11
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A mod to get rid of vvt sprocket rattle or check if it's the sprocket making the noise
is ground the yellow wire going to the vvt solenoid, just 'T' into it and to ground will do
plenum support bolt is close and good earth/ground point
when grounded/earthed you will get full oil pressure to the sprocket constantly
you can run it like that to check if noise goes away but may notice loss of top end power after 5k revs

another thing is the oil feed drilling for the sprocket in the head is tiny
and it only needs a bit of engine crud to get in there and starve the pulley,
a good working sprocket can start to rattle after 100>500miles if
the oil feed is restricted
if oil spray bars for the rockers are blocked with engine crud
that's not a good sign regards the sprocket oil feed being clear and flowing oil
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Old 06-22-2018, 04:08 PM   #12
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One of the signs of a worn aging oil pump is the return of the VTC clacking at idle shortly after returning to idle. A nice mechanical oil pressure gauge will usually confirm the low oil pressure (often 7-9psi at idle) that accompanies the tick tick tick noise.

Note that there are two ticks. One is the solenoid when it turns on. That is not the noise I am referring to. You can turn this noise "off" by simply unplugging the solenoid.

The other noise is a consistent tapping that sounds like a rod knock. That is the gear slapping around due to either low oil pressure, low oil feed, or worn out internal gear.
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Old 07-11-2018, 12:12 AM   #13
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Unplug one of the plugs on the iac. I think its the brown. Mine made a similar but not as loud sound and I found that if I unplugged it it went away. Replaced the iac and that fixed it
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Old 07-11-2018, 01:31 AM   #14
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when i was adjusting the TPS on my s14 SR, i had a paperclip back-tapped into the middle wire for the TPS, and i swear i heard that same clicking as in the video when i'd play around with the paperclip while it was in the back of the harness plug. my clicking was not as fast as yours though. mine was a little more controlled. only clicked when i would move the paperclip a certain way. i felt like maybe i was shorting something? but the paperclip is just sitting in the back of the harness plug so that didn't make sense.

OP doesn't appear to get on here anymore, but i found him on facebook. let me know if you can't find him.

vdub, update this when you figure it out.
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