[Mspbcguy]

so ever since I got that car around 40mph I get a vibration and disappears if I go 5 miles under or over. Originally I blamed it on the tires that I still need to replace. However I did the valve cover and valvetronic gasket 2 weeks ago. The vibration disappeared for a few days and than came back. I did relearn the valvetronic start stop limits and also noticed that the previous owner replaced 5 out of the six ignition coils. could the one mismatched coil cause something like that. I'm not getting any error messages at all.

[Brian86]

Usually vehicle speed specific vibrations are in the driveshaft.

Go coast down a modest hill at a steady 40mph, in drive, then in neutral. If the vibration persists it's not the engine.

[2one3E90]

Originally Posted by brian86

usually vehicle speed specific vibrations are in the driveshaft.

Go coast down a modest hill at a steady 40mph, in drive, then in neutral. If the vibration persists it's not the engine.

smart way! How bout if u clutch in

[e90yyc]

Originally Posted by 2one3E90

smart way! How bout if u clutch in

Lol I can’t tell if you’re serious or not, but yes… same diff. If you really want to go for the adrenaline, just kill the engine altogether for 100% certainty . But don’t…