I messed with the cobra again last weekend, I am still having trouble finding the correct thread of the passenger side exhaust header EGR bung pictured below. Does anyone
have any ideas on where i can find it or even know the correct thread?! i'm not sure if having this big of an exhaust leak could cause my vibration issue as i'm sure the engine is off from the leak.
Anyways I drove it around some more and noticed the clutch seems to feel strange, compared to my 99 GT it feels "numb?" I guess thats what i'm trying to describe. Again the clutch is a brand new FRPP kit, I know there is a break in period for clutch kits, however i'm afraid to drive it much further until i figure out the vibration issue as i don't want to risk damaging the brand new clutch.
I took some video of the vibration im trying to track down. The first video is at idle, it doesn't seem to be much more than my 99GT, in fact you can barely feel any vibrations when its at idle, however the engine seems to move more than it should? The second video is driving around in 2nd gear at around 20mph. in the second video you can see the shifter & steering wheel shaking. HOWEVER the vibration seems less harsh compared to the first time i drove it, which leads me to think the new motor and trans mounts need to break in??
Looks good! Just some personal feedback (take it for what it's worth) and hopefully some help on the vibration
-On the exhaust, I never use those cheap U clamps. It pinches the metal making it almost impossible to disassemble the exhaust if you plan on doing so in the future. I always use lap band clamps or since the metal is cut with slits on the M80 mufflers a heavy duty clamp. Examples linked below:
Summit sells house brand clamps for cheaper of these styles but I just linked the quickest to give you an idea.
-On the clutch, did it come with a FRPP TOB? I ask because I've had a TOB fail after 15K miles using the one that came with the kit. Did you replace the pilot bearing? How's the transmission mount look? I had a clunking noise when mine failed. Replaced it with FORD OEM RUBBER (this is important because I used an aftermarket one and it was crap) and it fixed that. Other uses reported when theirs failed it was vibrating like crazy. Did you replace the pivot stud and TOB clutch fork? These are wearable items.
Onto the vibration - Is it felt in your ass (whole car vibration), felt in the shifter (transmission vibration), or in the steering wheel? Does it happen when you rev,or at a certain speed regardless of RPM? Does it happen at a certain RPM while in neutral?
At a certain speed I was getting insane steering wheel vibration. Took my car in and got the wheels re balanced and all was fine. Whole car vibration can be the driveshaft. Transmission vibration (you an see the shifter going nuts) can be a bad trans mount to something improperly done with the clutch install (never did it myself so I can't start pointing out things to look at here).
I'm leaning towards a drive line issue. Gut says your drive shaft is out of balance. You can take your stock one to any driveline stop and get it rebalanced. You can also buy an aluminum one from Ford Racing that comes pre balanced which will also include new, beefed up U joints. Again this is internet diagnosis based on most plausible cause so take it with a grain of salt.
You can also check things like the steering components. How do the inner and outter tie rods look? Is there any play in the tires when the front is off the ground? Jack up the front and grab 12 and 6 oclock. Rock in and out. Same with 9 and 3 o clock. Check for play. On the rack pull back the boot - is there any steering fluid in there? This could indicate a leaking rack which destroys inner tie rods. Get the wheel half an inch off the ground and lift with a crow bar. Is there a clunking noise? This could indicate a bad lower ball joint. I see you tore into the lower control arms. How did the bushings look? People have indicated sloppy steering (which can translate into vibration at speed) if those are shot. I'm throwing rocks here as I don't know the answers to my original questions.
How's the motor mounts look?
I'm just throwing ideas out there.
---------- Post added at 07:08 AM ---------- Previous post was at 07:06 AM ----------
Also, why the Mercedes Benz front plate? lol - seems extremely out of place...
Wow thanks for the feedback!! ill try to answer it best i can lol
Exhaust - I'll look into the clamps that came with the catback this will be a last resort
Clutch - I installed a FRPP clutch kit and it came with a genuine Ford TOB. I did not replace the pilot bearing as the one in the car looked like it was replaced when someone put the clutch in that i took out. Pivot stud & TOB fork, these two i didn't replace as i didnt know they needed to be replaced.. would these cause vibrations or shifting issues down the road?
Vibration - The vibration is felt in the entire car, as well as the shifter and steering wheel (see videos above) the vibrations are "normal" or similar to my 99GT at idle, but as soon as it gets above 1,000 RPM it gets worse and keeps getting worse the high the RPM's climb. i havent gone past ~3,000RPM.
Motor/trans mounts - BOTH motor and trans mounts are brand new, do they need to "break in" ? really hoping i didn't incorrectly install or overlook something with the clutch
Steering components - they look fine, i did test the inner and outer tie rods, there is no play in them. Both front lower control arms are brand new Moog units.
Drive shaft - While im not outing this just yet, I really don't think the driveshaft is the issue because if it was i wouldn't feel it at idle because the driveshaft isn't spinning correct? and in my case i do feel a slight vibration at idle.
Mercedes Benz front plate - hahah this is a joke from my brother, just before I bought this cobra I purchased a green 2000 E430 4matic, a V8 AWD sedan as a beater to fix. I got it all fixed up and on the road, only to hit a deer and total it two weeks after getting it on the road. When they picked up the Benz my brother took the front plate off and put it on my cobra to be funny lol I just havent gotten around to taking it off.