Could just be the injectors.They make a clicking noise when the engine is running and you usually can`t hear them when the hood is closed.Some are louder then others.If you know a good mechanic just have him listen to it or stop by a shop and have them listen to it.Go to more then one shop.Some places will might tell you your motor is going when it really is not.You need to be careful.Hope this helps.Good luck.
SOURCE: 2002 Chev Blazer has ticking noise when started.
Hi There;
Sorry I wasn't trying to suggest anything I was only trying to collect information.
The fact that you keep the oil fresh & the level up helps alot when trying to figure this out over the net.
With the information you have given me It looks like you have one of two possibilities.
To try to figure it out you'll need to start the truck cold with a friend around. have the hood open so you can hear the noise clearly. next have a friend plug the tail pipe with a rag or their boot or something. This will increase the presure in the exahst. as the pressure increases in the exahst I suspect you will notice the sound increases or changes substantially. if this is the case you have an exahst manifold leak. Either the bolts that attach it to the head are broken or the manifold it self is cracked. This is quite common on mid to high milage engines.
The next possibility & less likely is a weak or sticky lifter. this is less common in engines that have clean oil & are well maintained.
The fact that it was doing this more when cold & that you discribed it as a "TICK" pretty much rules out any other issues.
P.S. With this info I am assuming the noise is from under the hood. If you notice the sound is coming from somewhere else when you pressure the exahst would lead you to a leak elsewhere in the exahst of course but the fact that it is engine temprature related still leads back to the manifold.
I know this is a lot of info but if you follow it through step by step you should be able to figure this out.
Please let me know how this works out for you.
Farrout!
SOURCE: car won't start and makes a ticking noise
CHECK IF TURN SIGNALS WORK, USUALLY ON GM CARS IF A BULB IS BURNED IT WILL TICK FASTER, IT IS AN INDUCATION OF BURNT BULB - COULD BE FRONT OR REAR
SOURCE: ticking or knocking noise, speeds up when the idle
culd be lifter-rocker arm- rod/main bearing
SOURCE: Loud ticking noise in cab under glove compatment.
get your owners manual out and find where the fuse panels are. there is generally one under the hood and another one under the dashboard. when you find them, there are relays and flashers plugged in as well as fuses. put your hand on the one under the dash it when you hear the click and you can feel which one it is. if that is not it, i would suggest talking to a chevy service manager about vent and heater box flap actuators as being the cause.
SOURCE: 2003 Chevrolet Cavalier, 2 door,
this sounds like an imbalance in the fan cage(squirel cage),either something has fallen into the fan to cause the problem or the fan has a problem with it,or the fan motor is bad.either way it will have to be removed and either cleaned of the debris that has fallen into it or the squirel cage will need replacing or the fan motor will have to be replaced.
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