Engine starting to knock/tick.

cre · 02-24-2010, 05:02 AM

Sure, it could be something simple... I've seen a loose cam gear cause a tick which resonated down the length of the camshaft making it sound like it was coming from the back of the engine... but, sadly, I wouldn't count on it; it is worth checking for though.

Unless you pulled the cams and removed the shims and buckets you can't tell if you've lost a valve or broke a spring... pulling valve covers is only one fourth of the trip.

I'm not terribly familiar with all of the construction of the 1JZ, so the best I can offer is conventional diagnostic advice; I can't point you to common failure points.

The next thing I would do is: while the engine is running, pull the wires to the coils one at a time to determine if the sound is indeed tied to one specific cylinder and if so which one.

02-24-2010, 05:02 AM	#4
cre Toyota Racing Development Join Date: Apr 2007 Posts: 5,038	Sure, it could be something simple... I've seen a loose cam gear cause a tick which resonated down the length of the camshaft making it sound like it was coming from the back of the engine... but, sadly, I wouldn't count on it; it is worth checking for though. Unless you pulled the cams and removed the shims and buckets you can't tell if you've lost a valve or broke a spring... pulling valve covers is only one fourth of the trip. I'm not terribly familiar with all of the construction of the 1JZ, so the best I can offer is conventional diagnostic advice; I can't point you to common failure points. The next thing I would do is: while the engine is running, pull the wires to the coils one at a time to determine if the sound is indeed tied to one specific cylinder and if so which one. __________________ If something breaks or you need to contact a member of the administration please post HERE. Unless it's a private or administration matter please post it on the forum. It benefits no one else if car related questions aren't posted for future users and takes away from the time I'm able to spend helping on the rest of the forum. If you're so inclined I'm always more than happy to accept tips via PayPal. Tip Jar --->

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