Made a vid of my "flywheel noise" , is it the flywheel? ---

[alwayscode390]

Thanks guys for the heads up.

I will replace the injectors with the Accel units also ... they are good with the new gas , and shouldn't go bad again ... right? Does anyone have the part numbers I need off hand? Is Jegs the best deal on them?

Why does the injectors cause anything with the flywheel ... sorry Im being ignorant here. Could someone explain what exactly is happening?

Should anything else be replaced while the plenum is off for the injectors ( starter? ignition stuff? ).

Would I be safe running down the 1/4 mile a couple times the way the car sits right now, or should I wait until I get all this situated? ---

[RyanChappel]

As the efficiency of the injectors begins to decrease, the 'timing' becomes erratic, and the dual-mass system tries to compensate for this....hence the 'clacking' noise

But I'm sure there is a much more accurate technical description of what is happening...I was scared sh*!less that I had damaged the engine and I put it on a truck and sent it up to Marc. I gave him carte blanche to completely review and repair every flaw he found.

I have twice the car now, thanks to Marc.

[alwayscode390]

Thanks for that Ryan ... it made it a lot more clear to me ---

[alwayscode390]

I just talked to the previous owner who installed the headers. The Air System has been totally uninstalled.

Its looking like I either have a single mass flywheel ... or I am having issues with my Ford injectors.

Would a vacuum leak cause any noise?

If I run at the track Wed. , and it is the injectors ... whats the worst that can happen? It will stutter and I get out of it, or can I possibly cause a lean condition? The Dyno showed solid A/F ratios throughout the 7k rpm pull.

THANKS ! ---

[XfireZ51]

Typically, a SMFW will stop knocking once the clutch is depressed. You're saying that doesn't happen. So....

[Pete]

Check for loose exhaust screws.

Pete

[alwayscode390]

I will test my injectors and the exhaust screws first.

I was told by a respected member through PM that I should have no problem going to the track ... it would actually be a great place to test everything out.

If I am having a miss the car wont pull the numbers its supposed to ... if its running strong , I shouldn't worry about anything major happening ; but there are things I can do to quiet down the flywheel. He also said it could very possibly be the way my flywheel reacts to the cams at low idle.

I appreciate everyones advice and troubleshooting for me. I feel like I have a direction to follow , and I am not in the dark anymore ---

[alwayscode390]

I was also told by someone I spoke with at LPE that most Dual Mass Flywheel noises are caused by a mis-fire.

Should I just plan on swapping out the plugs and wires? Besides those , what else causes a misfire ... the injectors or coils?

Would I have a code?

The car idles STRONG and smooth when you look at the tach. I don't hear a miss

Here is the dyno vid and graph. This is with a rattling broken center resonator , it now has an x-pipe in the same spot. The A/F seems solid, the graph seems smooth ... and the car drives GREAT as long as you are over 30% throttle when the secondaries kick in (then all other times its great). Its also putting out the power I would expect it to, its the 465hp LPE package with Watson headers. 43k on bottom end, 20k on top end ---



DYNO:



http://www.youtube.com/watch?v=bMdFUoaL6R4

IDLE Vid :



http://www.youtube.com/watch?v=6ESq4xpNY88

[alwayscode390]

Im thinking more than likely I will find injector issues.

How many hours should I expect a shop to charge for the injector swap?

Is this something I should take to a Chevy Dealership , or use my normal performance shop ... so they can get more acquainted with the LT5? I am pretty sure they had never seen one before I drove mine in.

I don't have anywhere to do it , or it would be neat to pull the plenum and learn more myself. I will find the time and place someday.

What tool do I need to buy to check the injectors using Haibecks method?

THANKS! ---

[alwayscode390]

I took a new vid of the flywheel from the passenger side after my trip to the track. I can almost picture the weights bottoming out. :

http://www.youtube.com/watch?v=jaGDqqvrMjY


Track Vid / Time Slips thread :

http://www.zr1.net/forum/showthread....940#post172940