04 ford taurus rev limiter problem

[muthstryker]

Hey guys, I have a question. We have an 04 ford taurus that we just got and the rev limiter is kicking in at 4000 rpm. When going up hills the car starts to jerk violently. If anyone has any ideas, I thought I would check here befor going to a mechanic or a dealer. Also when you put the car into park and give it gas it does the same thing.

[GetMore]

I have seen a few cars that have a lower rpm limit in park. I think they do that to limit the shock of doing a neutral drop. So, I think that's normal.
I'm guessing that maybe the PCM thinks it's not in gear.

[wedgehead]

check the park neutral switch to see if the PCM is seeing the trans in gear. You will need a scanner for this

[MonzaRacer]

First of all the rev limiter would not be that low, try putting a new set of plugs(proper motorcrafts) and new plug wires on (preferably Belden from NAPA or Motorcraft).
Also double check the fuel filter and fuel pump(pressure).

[muthstryker]

Ended up being the catalytic converter/O2 sensor. Both where out and thats what apperently was making the car jerk violently when going up hills. Just drove the car around for about an hour and nothing happend. Will watch and see what happens over the next few days.

[MonzaRacer]

Honestly if the converter was toast get a major tune up , light misfires may get missed by ecm but kill a converter