Loss in Perfomance

[bryanjoseph]

I timed my '91 GTP, an automatic, at about 10.5 sec. from 0-60. Published numbers for a 3.4L GTP with an automatic when new are at 8.5 sec for 0-60. Obviousy you'd expect an engine with 125 000 miles to be a little worn but this seems to be a large loss of power. Besides internal engine wear of piston rings, etc , What other worn engine parts would decrease the performance of an engine?

[phantomFE3]

valvetrain, all the lifters and springs and the cams and everything will wear out

[93GTP]

-Timing belt wear, knocking out timing.

-Bad O2 sensor

-Vacuum leaks

-Dirty injectors

 

By the way, the stock number is more like 7.5 for 0-60

[cutsup1996]

run some topend cleaner, fuel system cleaner, how are plugs and wires? O2 sensor, is CAT good? timing, what octane gas you run, clean IAC too.

[whitetrack]

... could also be that the catalytic converter is breaking down. When that happens is clogs the pipe and builds up back pressure, reducing performance.