Vibration after TR55's and Mounts
Vibration after TR55's and Mounts My 98 Z28 M6 had been getting bad gas mileage lately. I pulled the plugs and they were shot. I replaced the plugs with TR55's and installed MSD wires. Durring the test drive I heard a big CLUNCK while shifting hard into 2ed gear. I went home and put the car in the air. The trans mount had broken. I replaced it with a poly unit.
On a second test drive I felt a strong vibration above 1500 rpm. It happens in Neutral, with the clutch in, and with thing clutch out. Once again I put the car in the air and found a broken motor mount. I replaced the mounts with poly ones. I went out in the car this morning after a long night of installing mounts!!!!! and it STILL vibrates
On a second test drive I felt a strong vibration above 1500 rpm. It happens in Neutral, with the clutch in, and with thing clutch out. Once again I put the car in the air and found a broken motor mount. I replaced the mounts with poly ones. I went out in the car this morning after a long night of installing mounts!!!!! and it STILL vibrates
I just pulled off each plug wire individualy while the car was running. Each time the RPM's dropped slightly as normal, except for number 5 where the idle only slightly changed. Nothing was realy out of the ordinary.
I pulled the number 5 plug and it was white as if it was running lean. Then I pulled number 3 and it was the same. The white color on the ground could just be oxidation since they are brand new and have not became carbon coated yet. I gapped all plugs to .055, that is what I read on the forum in the past. What does everyone else gap their LS1's to?
I pulled the number 5 plug and it was white as if it was running lean. Then I pulled number 3 and it was the same. The white color on the ground could just be oxidation since they are brand new and have not became carbon coated yet. I gapped all plugs to .055, that is what I read on the forum in the past. What does everyone else gap their LS1's to?
Originally Posted by Cory1970
I have had F-bodies before with Poly engine and tranny mounts without vibrations even close to this bad.
Originally Posted by you2slo
Maybe something other than plugs/wires causing the poor gas mileage and vibrations. What other mods?
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Originally Posted by TUFAS4U
i had crabs once 
just thought id share
just thought id shareI wish I could have used a poly trans mount. The stock one sucks. My shifter just moves as it pleases when the motor is under load.