Cascade Crew

LB985IROC · Posted: Mon Dec 25, 2006 6:20 pm Post subject: trouble

so im drivin my car to my cousins today for dinner and i noticed at off idel around 2-2500 rpm it was amaking aticking tnoise and got there and checked the oil and stuff it was good then on the way home about halfway back it started doing the noise all the time so i got home and you can hear it really loud its ticking at idle not liek a rod nock but loud ticking and if you reve it up slowly it seems to not get louder with the engine and it still runs and drives fine i put a screw triver on it and listened and you can definateley hear the sound when reving it seems to get a little quieter and thats listening throught the intake throught he valve cover i cant really hear it as wwell ....im thinking its a lifter my oil pressure is fine....im not sure im not as familiar wiht thoese engines as with small import motors

izcain · Posted: Mon Dec 25, 2006 10:07 pm Post subject:

Sound like you might have some valvetrain problems, You ought to take a peek under those valve covers aqnd see whats going on in there. Maybe a stud has pulled up or something...... Maybe just a loose rocker arm. Were you just driving normal when it happened or were you gettin on it when it started?

RSFreak · Posted: Mon Dec 25, 2006 10:16 pm Post subject:

Same thing happened to my 85 Z28 a few years back. When the ticking started I noticed a performance drop right away and pulled the valve covers immediately. Turned out to be a broken push rod! Damnest thing I ever saw! I've heard of bent push rods before, but this one was broken in two! I had to use a magnet to fish the lower half out of the lifter valley. Shocked

Quasi-Traction · Posted: Mon Dec 25, 2006 11:30 pm Post subject:

I hope its not that extreme.

noises like that can be mistaken for valvetrain noises when there something as simple as a blown exhaust gasket or exhaust leak.

Peek around and let us know!!

might not hurt to pull the valve covers and make sure the valvetrain events are occuring normally and without any problem!

LB985IROC · Posted: Tue Dec 26, 2006 8:48 am Post subject:

well it seems to perform normal and the noise is so damn intermitant like it would only do it at like 2500 rpm wiht no load on the motor then it went away after driving a bit and now it sounds different, really faint but only if you rev the motor

LB985IROC · Posted: Tue Dec 26, 2006 8:49 am Post subject:

oh ad i did notice i can hear the noise loudest through the water pump.....

LB985IROC · Posted: Tue Dec 26, 2006 9:40 am Post subject:

so this morning im doing a motor oil flush, oil change wiht royal purple and adding some lucas oil stabilizer

Quasi-Traction · Posted: Tue Dec 26, 2006 1:50 pm Post subject:

LB985IROC · Posted: Tue Dec 26, 2006 2:14 pm Post subject:

well the fluhs didnt really help but when i first start the car cold it takes a minute for it to statrt and when you rev the engine it gets a little louder but then starts to fade out as you rev the motor and intermitantley comes on while driving

LB985IROC · Posted: Tue Dec 26, 2006 5:27 pm Post subject:

well at this point my step dad believes its an exhaust leak...

aaron_sK · Posted: Wed Dec 27, 2006 3:00 pm Post subject:

Headers, or stocker manifolds? If it's headers, then yeah, probably a leak. Manifolds can leak if the bolts back out though.

izcain · Posted: Wed Dec 27, 2006 7:56 pm Post subject:

The manifolds can crack as well. I have seen this happen.

LB985IROC · Posted: Thu Dec 28, 2006 11:59 am Post subject:

well i had a few of the techs at work listen and play with it theyre all sure its a bottom end noise i.e. spun bearing....this sucks so much

mrpopo573 · Posted: Thu Dec 28, 2006 3:36 pm Post subject:

Are we talking about your new z28? I thought the motor was brand new...

LB985IROC · Posted: Thu Dec 28, 2006 5:10 pm Post subject:

YEA IT IS......thats why im so pissed about it and the shop that built the motor recently went out of business...im trying to decide my options i spent all my money on the car and now i want to fix it but could i get away with just either having the cranky turned or replacing it and putting in new bearings? or maybe just new bearings<<i doubt it but its worth asking

chevymad · Posted: Thu Dec 28, 2006 6:06 pm Post subject:

If it hasnt gone on very long then you very well could get off that easy. You won't know for sure until you pull the pan and take a look. Worst case scenario should be a crank kit and 1 new rod. If its a new engine then it's entirely possible something has come loose. Hopefully it hasnt worn the crank or rod too much yet.

LB985IROC · Posted: Thu Dec 28, 2006 7:32 pm Post subject:

lol just thought id put this in here but my step dad stil swears it has an exhast leak

aaron_sK · Posted: Thu Dec 28, 2006 9:09 pm Post subject:

Just throw a set of gaskets on the manifolds. It's a cheap test to rule that option out.

mrpopo573 · Posted: Fri Dec 29, 2006 10:14 am Post subject:

Always nice when the motor builder goes out of business...

Still with a fresh motor I would try to eliminate all external "theories" first.

Like he said, do the manifold gaskets.

Also, I am no motor pro by far, but aren't internal problems always constant noises in the RPM range? As in, they don't have a magical RPM number they only make noise during?

LB985IROC · Posted: Fri Dec 29, 2006 10:43 am Post subject:

IT DOES IT AT AN IDLE LOUDEST IT SEEMS TO FADE OUT SOME ABOVE IDLE AND SEEMS LIEK IT GOES AWAY BUT THE CAR IS LOUD SO IM NOT SURE IF IT GOES AWAY, IT IS DEFINATELY LOUDER WHEN THE CAR IS WARM