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ticking or rattling at idle only

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Old 12-21-2011, 07:49 PM   #1
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ticking or rattling at idle only

96 4x4 2.7 5spd 145k miles. it has a rattling sound at idle only. the first time i start it in the day after its been running for about 30 seconds to a minute the rattle/tick starts. Any rise in the rpm's the ticking stops completely then as soon as it goes back to idle the rattling starts again. no loss in power, mpg, or anything like that runs great just a little worried about the noise. im guessing its not the valves since it stops as soon as i hit the gas. also guessing its not a exhaust leak for that reason also. anyone have any ideas?

also its not a the same rythme kinda noise.
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Old 12-22-2011, 07:56 AM   #2
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Bump bump
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Old 12-22-2011, 02:36 PM   #3
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hmmmmm
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Old 12-22-2011, 09:40 PM   #4
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does it tick louder when you give it a little gas? cuz my truck does that too
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Old 12-22-2011, 09:58 PM   #5
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Quote:
Originally Posted by rll131 View Post
96 4x4 2.7 5spd 145k miles. it has a rattling sound at idle only. the first time i start it in the day after its been running for about 30 seconds to a minute the rattle/tick starts. Any rise in the rpm's the ticking stops completely then as soon as it goes back to idle the rattling starts again. no loss in power, mpg, or anything like that runs great just a little worried about the noise. im guessing its not the valves since it stops as soon as i hit the gas. also guessing its not a exhaust leak for that reason also. anyone have any ideas?

also its not a the same rythme kinda noise.

Check lash on your valves, one is probably a little out of tolerance.
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Old 12-26-2011, 10:07 AM   #6
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Heat shield on exhaust manifold or possible cat, had the same issue. My heat shield mounts were broke and the cat would rattle due to bad rubber mount bushings but under throttle it'd go away.
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Old 12-28-2011, 01:47 PM   #8
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doesnt tick at all if i give it gas only ticks at idle more of a rattle sound. also its not the manifold or shield i checked them out. and i just replaced both o2 sensors and cat. runs great no cel or anything just wondering what it is.
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Old 12-28-2011, 04:33 PM   #9
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how can i tell if its a check lash and will that cause any issues?
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Old 12-28-2011, 07:01 PM   #10
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Quote:
Originally Posted by rll131 View Post
how can i tell if its a check lash and will that cause any issues?
You have to pull the valve cover and get some feeler gauges and measure the clearance between each cam lobe and the shim that the lobe rides on. It can cause issues if not taken care of eventually, record your measurements on a piece of paper for each intake and exhaust valve then compare them to factory specs, if out of the given range you will have to order new shims thru toyota and then install those on your motor. Hint sometimes you can switch shims with other valves and get them back in spec that way but not a gurantee. If this sounds confusing your better off taking it to a capable mechanic as it is a little involved, but at least spec out your valve lash clearances as anyone can do that. Good Luck man
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Old 12-30-2011, 01:02 PM   #11
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ive been doing alot of research on valve lash almost every search ive done and every video ive watched if it where valve lash the noise became faster under throttle the noise on my truck dissapears as soon as there is any throttle. im stumped lol i almost dont care because it runs great just a little annoying.
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Old 01-03-2012, 02:22 PM   #12
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Same problem. Valve lash in spec. It's something else.. hmmm.
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Old 01-03-2012, 02:23 PM   #13
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I have an 09 and when my A/C is on at idle it ticks and rattles. Then i push the clutch and it stops too hmmm...
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Old 01-03-2012, 06:11 PM   #14
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Quote:
Originally Posted by xwillx93 View Post
I have an 09 and when my A/C is on at idle it ticks and rattles. Then i push the clutch and it stops too hmmm...
Sounds like TOB is your problem if it is clutch dependent.

To OP if you checked your lash then i don't know what to tell you, maybe post a video of your noise. My lash is outta whack but i have no time for my stuff fixing everyone elses problems. Good Luck to you guys.
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Old 01-04-2012, 11:41 AM   #15
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i will try to get a video up today or tomorrow.
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Old 01-12-2012, 08:01 AM   #17
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update video

http://s810.photobucket.com/albums/z...t=MVI_1384.mp4
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Old 01-12-2012, 08:09 AM   #18
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Dayum. Check your timing since you have a cap and rotor.
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Old 01-12-2012, 08:20 AM   #19
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Not sure how to do that but i was thinking it was the timing chain also.
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Old 01-12-2012, 08:35 AM   #20
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Quote:
Originally Posted by rll131 View Post
Not sure how to do that but i was thinking it was the timing chain also.
The 3rz has two balance shafts and a cam shaft sub gear. The sub gear was design to eliminate the infamous "Toyota tick" the previous engines were noted for. The balance shafts are for the higher compression of the 3rz (the 2rz does not have these).

The balance shafts are turned by a separate chain different from the timing chain. There are several tensioners in the system too.

You could have any one of these tensioners going bad, maybe a stretched chain, worn sprockets, etc.

To me, it sounds like it is in the valve train somewhere based on the video.
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