I have a 91 fc3s, I know it needs to OMP at least hooked up or limp mode is unavoidable. Well the car I have has no omp and a stock ecu... The problem I'm having is the car will not take more than 1/4 throttle at any time. I can rev to redline and drive the car 60mph plus but as soon as I push the gas pedal to far it spudders / will eventually die unless I back off. This occurs free reving/ no load and driving along!? I know the tps needs adjusting some but I don't think that's the only problem. I also plan on checking the grounds and have found no vacuum leaks. Now I've read about the 3800 hesitation but I don't think this is it. The car will do it at 1500 or 5500 and any where in between, it's all dependent on how far in the gas is pushed. I am leaning toward limp mode and tps out of whack combined. Could someone (who premixes) unplug their omp and rev their engine? And post a video so I can see if my car is doing the same!... Please
Oh and I'm about sick of this ( you must have this many threads before you can see this seemingly helpful thread) ! And I really don't want the junk up others threads just to up my post count...:-/ it's really annoying and keeps me from scouring the forum for my answers and looking at classifieds!

 

So you're in limp mode.

You need to plug in a metering oil pump.

 

So in limp mode you can rev the car but only with lite throttle? I'm used to limp mode just not letting you rev past 3k like with my z31 or 944...

 

It's limp mode. The ECU limits the amount of throttle you can apply.

 

Cool deal... So now I'm on the hunt for an omp for an s5, thanks for the help! Any one need z31 parts? Lol