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drshotty

Problems after clutch.

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Need all of your help. 

 

2010 Shelby. Put a 2.3L TVS on it. 2.4 pulley. 72lbs injectors. New Iridium colder plugs. intake. Twin 66 tb. Header. Xpipe. Bap. Bmr and Viking suspension. Tuned by Lund. Car ran fine. 

 

This is where the problem begins. Installed a new McLeod clutch, throw out bearing, and dss 1 piece driveshaft. Broke in the clutch. Car drives fine around town under 3k rpms. there is a large vibration above 4K+ rpms. Car will do a pull but it’s as if in won’t go full potential. Even a full pull cuts out around 130. And after the pull I get misfire codes and the car will run lean 17-18 afr and sounds like it’s cammed because at idle it struggles to even stay running. after turning it off and back on and letting it sit and run for a while it corrects itself back to normal. 

 

Lund turned off rear 02’s and said I may need the re-learn crank feature and have ford do it. Anyone have this issue before after clutch install? 

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Did you go with an aluminum flywheel?  The tune has to account for that as it is spinning less mass.  Could be the problem.... I would definitely try the crank re-learn and see what happens.  Good luck!

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26 minutes ago, ViperNC said:

Did you go with an aluminum flywheel?  The tune has to account for that as it is spinning less mass.  Could be the problem.... I would definitely try the crank re-learn and see what happens.  Good luck!

I didn’t think about that.. you would think Lund would have told me that they needed to do a retune with a new flywheel? I’ll shoot them a message Monday. appreciate it! 

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I would also question the installer for your clutch.  If that guy is worth his salt, he should know the computer has to be reprogramed to account for the aluminum flywheel.  :whistling:

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Update: Tried to have a crank re-learn done and the car is misfiring on cylinder 7. We did a relative compression test and cylinder 7 is 4% off from the rest of the cylinders. Swapped out the spark plugs because cylinder 7's was bent. After new spark plug it ran fine for 10 minutes and then started to misfire again. Pulled the new spark plug and it was bent just like the one before. We can believe that the piston would be hitting the spark plug but don't know what else would be hitting it so consistently. Were going to pull the head and figure out whats going on. So for now the Shelby is down.

If i build it, does anyone have suggestions on brands or pistons and rods?

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Edited by drshotty

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Holy Crap!  That is crazy.  Coincidence that this started right after your clutch install.  I'll defer to others about commenting on heads, pistons.  You may want to research with Revan Racing and Watson Racing.

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On 4/2/2018 at 7:41 PM, drshotty said:

Update: Tried to have a crank re-learn done and the car is misfiring on cylinder 7. We did a relative compression test and cylinder 7 is 4% off from the rest of the cylinders. Swapped out the spark plugs because cylinder 7's was bent. After new spark plug it ran fine for 10 minutes and then started to misfire again. Pulled the new spark plug and it was bent just like the one before. We can believe that the piston would be hitting the spark plug but don't know what else would be hitting it so consistently. Were going to pull the head and figure out whats going on. So for now the Shelby is down.

If i build it, does anyone have suggestions on brands or pistons and rods?

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Wow never seen a bent plug but that would explain the miss fire with no gap, You could send a scope down to  have a look inside cylinder but looks like you may already damaged the piston so i guess a tear down is in order.Good Luck

Edited by shelby001

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I would recommend to change the title of this very interesting thread because the problem has nothing to do with the clutch.

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