tp65

My rpm at WOT does not increase smoothly. Its smooth into about 4,000 rpm and then it looks like the rpm slightly slows down and then speeds up and then slows down again..like it hesitates a little... but i cant feel it, i just see it. What could be the problem?

tp65

can anyone help me?

67mustang302

If you feel the car accelerating smoothly and the tach is fluxuating, it's prolly the tach or wiring related to it. If the rpm changed enough for you to see it on the tach, you'd feel it

tp65

ok thanks! i feel much better now.

67mustang302

It could also be ignition related since that's where the tach gets signal from, but I'm not an expert in that area

90Lxstanger

Heres the real question, IS this the stock tach you tralking about? if so thats you answer them suckers are off like 200-300 rpms and fluxuate very weird

tp65

yes its the stock tach. do u mean there off 200-300rpm ahead or behind?

90Lxstanger

Mine is behind, as well as others im assuming behine also, but yeah there off a good bit sometimes almost 400, but it changes on different days i guess, just like every other gauge, wanter temp, and oil pressure thay all just suck, IMO[&:]

tp65

ok lol, i know what u mean now.. i just realized my gauges do change alot for some reason... and then the next day there different again.

tp65

i got one more question.. does the aode suppose to shift at 4800-4900 rpm at WOT because mine does.