wierd RPM issue with a 3.0 Fuel pump?

[68ragtop]

Hey guys, workign on my mother-in-laws 2001 3.0 V6. The car won't rev over 4K & can't get it past 40MPH. REminds me of a rev limiter in a gas power golf cart. Any extra gas pedal does nothing. It is setting codes for a lean fuel condition on both 1&2 banks. TPS seems fine, & fuel pressure sits right at 40psi. Are these supposed to be closer to 60PSI I have no clue.
I can hold the accelorater to the floor in park & it stops at 4K, not sure if thats part of the problem, of if these have a 4K rev limiter when its in park?

Any ideas?

[68ragtop]

I got it. It was the MAFS

Thanks for checking in.

[wraith05]

My car has the exact same problem I already switched out the MAF and no go. The scanner shows that it has multiple miss-fires so they said it was a bad ignition module but to switch both to be safe. Both ignition modules have been change and still the same problem. I was thinking it might the fuel pump as well but my car has good fuel pressure. Now the only thing I can think of is problems with the torque converter? I read a while back that the torque converter in these cars engage at 3000 rpm and that's where the rpms stop, any ideads?

[Crvett69]

did you change the plugs and your plug wires?

[wraith05]

I switched the plugs but not the wires.

[Ruley73]

Originally Posted by wraith05

My car has the exact same problem I already switched out the MAF and no go. The scanner shows that it has multiple miss-fires so they said it was a bad ignition module but to switch both to be safe. Both ignition modules have been change and still the same problem. I was thinking it might the fuel pump as well but my car has good fuel pressure. Now the only thing I can think of is problems with the torque converter? I read a while back that the torque converter in these cars engage at 3000 rpm and that's where the rpms stop, any ideads?

Please post what code numbers you are getting. I'm thinking that one of your transmission's speed sensors (input or output) may be bad. Either one might cause the 4000 RPM/40MPH limitation. I would try unplugging one of the speed sensors at a time and going for a drive. The one that doesn't make any noticeable difference during the drive while being unplugged is the bad sensor. Either sensor costs around $20 so it would be a relatively cheap fix.

[wraith05]

I found the problem it was a clogged catalytic converter, thanks for the help