When it rains it POURS!!!

[C4Fanatic]

Originally Posted by rhipsher

I've had the car 5 years and never had it tuned. Who ever owned it before me had the 1-4 shift disabled. I never have to press the clutch down to start the car amongst other things. I know that the tac needs to be recalibrated because the first time I took the car to top speed to where it had no more to give in 5th gear my tac was sitting at 7100-7200 rpms. After top end porting I ran the car top speed all out again to 181 and the tac was at 8000. But both times the tac was always at 950 rpms at idle. But im getting ready to have corey do headers and all so he with tune the car where everything should be.

This sounds almost like my car to a "T". No skip shift, no clutch in to start, and no rev limiter at 7200.

After more input from local folks and more searching, we are of the consensus that it is most likely a bearing in one of the auxiliaries, either power steering or water pump, alternator or the A/C.

There is no miss, even if you rev it. Idles smooth etc.
So, when I return home from Virginia I'm going to begin checking all the things I mentioned. And ONE OF THESE DAYS I'm going to get a tune and chip from Mark or Corey so I know exactly what's what in regards to all that chit.


"Anyway, Hope yours turns out well. Learning how to change a lifter (and while I'm in there timing chains) on my LT5 is nice to know, but I'd rather wait until I HAVE to know to learn about it."

AMEN BROTHER!!!

[cvette98pacecar]

Dave, Haven't heard from you in a couple of weeks. Hope your issue was a secondary bearing.

[Pete]

Put a stock chip in it go 1st gear WOT till rev limiter hits at 7200 and see what your tech reads.

My tech used to be off by 1500 rpm it would show past 8K when me rev limit hit.

You can not hurt this motor by overevving once.

Also the 1-4 skip shift anyone can disable just unplug the plug on the side of the trans.

PS
I totally doubt this but,you could've just bled down a lifter or 2 by either slapping a valve with a piston which in turn will bend a valve, if you only bled them down from overevving it will idle funny and clatter for a bit till they load back up once they load back up idle should be fine which means you just bled down the lifters from overevving.


Pete

[C4Fanatic]

Hey guys, sorry, been out on the east coast on business.

Had a couple folks listen to it, and here's what it seems to be.

On the headers are two air valves for the emissions system. At some time someone disconnected them and brazed them shut, but left the valves there. It seems that the guts of one of them is loose and clattering. The noise has actually gone nearly away.
I did a bunch of digging yesterday, removed the serpentine belt, no change. Put it back on, started the car and just let it sit and idle. As it warmed up, the clatter slowly went away, and was pretty much non-existent at idle.
Went ahead and drove the car yesterday to a local car show, no issues, pulls hard through the gears. Took it on a long drive today and she never missed a beat. So it seems all is well. When I get real motivated I'm going to have to drop the headers and have those things removed and the holes welded up.

[cvette98pacecar]

Glad to hear it is nothing major.

[C4Fanatic]

Originally Posted by cvette98pacecar

Glad to hear it is nothing major.

AMEN BROTHER!

[Paul Workman]

Originally Posted by C4Fanatic

AMEN BROTHER!

Wow... It is easy to see how you could be lead to think something loose in the valve train, due to proximity. Glad it weren't nuttin impotunt, uh-huh!

I have one of those mechanic's stethoscopes with the metal probe and the diaphram. It has worked - so configured, but sometimes the sound gets transmitted through the block and everthing I touch sounds like (whatever). Marc Haibeck removed the probe and diaphram and used just the open tube as the probe to isolate what turned out to be a bearing on the water pump. I tried it too, and in that case there was a distinct amplitude change when the tube was near the cause.

Slick trick!! Thanks, Marc for the tip!

P.

[cvette98pacecar]

Originally Posted by Paul Workman

Wow... It is easy to see how you could be lead to think something loose in the valve train, due to proximity. Glad it weren't nuttin impotunt, uh-huh!

I have one of those mechanic's stethoscopes with the metal probe and the diaphram. It has worked - so configured, but sometimes the sound gets transmitted through the block and everthing I touch sounds like (whatever). Marc Haibeck removed the probe and diaphram and used just the open tube as the probe to isolate what turned out to be a bearing on the water pump. I tried it too, and in that case there was a distinct amplitude change when the tube was near the cause.

Slick trick!! Thanks, Marc for the tip!

P.

That is great idear, Okay I was watching Orange Country Choppers.

[Kevin]

no clutch in to start has nothing to do with your chip by the way