[mascotlee]

Hi all,

I have a 93 corolla (AE101) and recently I noticed my rpm to be lower than before. Previously, at 100km/h, 5th gear, the rpm was around 3000rpm. But now at 100km/h, the rpm was only around 2000rpm.
I've recently changed the tyres but the tyre profile is still the same as the previous tyres. The spark plug and spark plug cables were also checked and changed so these shouldn't be the problem to the drop in rpm. Was wondering what can be the problem? Any suggestion is appreciated. Thanks.

 

[REN69]

Maybe the tachometer is not getting a proper signal from the motor anymore, not sure where the wiring for the tach would be, you may want to look into it and verify it's not cut or grounding somewhere.

 

[mascotlee]

Thank you REN69.
I will check to see if the tachometer is faulty. these two days the rpm reading dropped again to around 1800rpm. Think you should be right about the tachometer.

 

[93geoprizm]

3000 revs in 5th gear doing a 100 sounds too much, 2000 rpms actually make more sense
it hits 3000 for me when im doing 70 mph (113 kph)