something it ticking in under my hood sounds like its by the firewall and i cant quite figure out were its coming for any ideas

 

miles?....and maybe u need a valve adjustment...

 

It's the purge control solenoid. It's normal to make noise. If it really bothers you, purchase a new one.

 

104k it doesnt sound like valves tho thats what i thought it was was lifter tick but it sounds like its driver side fire wall

 

just #2 how much do they run any idea

 

y my friends cls has the same problem, seems to be common. its no biggy, just a little annoying
my advise get some sub and u ll never hear the ticking

 

Hi All :

My 99 has ticked for the last five years and it's especially bad in the cold. I was told by my local stealership that it was a fuel injector and that it was not defective, only noisy.

I know a large group on this site has reported the tick is caused by the purge solenoid, but why does it tick in time (actually very slightly out of sync, which I attribute to the computer firing the injector in advance) with the engine ? And yes, I have no idea what the purge solenoid does.

This is still by far the best site for auto facts and advice !! You guys have saved me hundreds of $$$. Thanks !!!

smartypants

 

99 tl 3.2 top end knock but it goes away after 10-20 min? car has 70,000 mi

 

elroy. you need a valve adjustment https://acurazine.com/forums/2g-tl-1999-2003-98/valve-adjustment-diy-progress-643700/

 

1999 tl 3.2 top end knock ?

 

it knocks @1100rpms do 3.2s have lifters

 

You need to have your valves adjusted.

 

Hi All :

Without sounding like a "know it all" (I'm not) and fully admitting I've never taken apart a TL engine (some others though) here's my ramblings on engine noises and related effects.

Typically ticks and knocks are the two types of synchronous sound an engine makes. Ticks tend to be higher frequency and shorter duration whereas a knock is lower and longer in duration. Ticks most often are related to the engine's upper end and knock the lower end. One simple way to tell the difference is; upper end ticks tend to go away in higher RPM's and lower end knocks tend to increase at higher revs. One important additional factor is as the engine gets hotter, the moving parts will expand and that's why it's important to always assess ticks and knock with the engine at operational temps. Given the mechanical (and not electronic) cause of these problems, the noise should be in absolute "time" with the engine and if it's not, look somewhere else.

Ticks are most commonly due to a large gap between the valve actuator and the top of the valve. Overhead cam engines do not have "lifters" which are typically associated with hydraulic valve lifters and push rods on a non-overhead cam engine. It was a regular event for a mechanic to adjust the rocker arm play between the top of the valve stem and the rocker arm "nose". If left unadjusted, the rocker arm could beat the top off the valve, causing the valve to drop into the cylinder and destroy the engine.

Overhead cam engines are quite a different beast. In this case, the cam shaft sits on top of the cylinder head and directly actuates the valves. This means that there are no rocker arms, push rods or lifters. In most over head cam engines, the distance between the the valve stem and the camshaft lobes is factory set and are not adjustable other than to shim the entire camshaft up or down. Overall, overhead cam engines tend to have more upper end "rattle" than push rod engines.

Since many on this site have had a "valve adjustment" I'm going to assume the 3.2 engines have "cam followers" which sits between the cam lobe and the valve. These must be adjustable in some way as the mechanics must be doing something.

So, I hope this has set some basis for the discussion about ticks and knocks. I would encourage the Professionals out there to correct any of the information I have presented.

smartypants.