It was running fine one day, then the next day i went to crank it up and it was hard to start, it wouldn't hardly idle and it wont rev past 3000 rpm. I checked for vacum leaks, replaced fuel filter, and cleaned the bac valve. It still wont hardly idle and it will rev up to 5000 rpm now but it still revs really slow.

 

check compression after letting the car cool off for 30 minutes, numbers should read 85-120psi

if that checks out, put new spark plugs in and i would replace the fuel pump

 

Do you have an S5. I ask because it sounds like your car is on Limp mode. Is your check engine light on?

 

nope its a 13b, but anyways i found problem. i just knew in my heart heart it would be this but i took my catalytic converter off and there was broken pieces of apex seal in there. i didn't want to think that was it but oh well. Thenks for your help guys. But ive got a project at hands now.

 

For future reference 88rx7man89, S4 and S5 are the different series of the cars, 86-88 is Series 4 and 89-91 is Series 5. They all had the 13b (the turbo was 13bt).

 

Thanks but im going to have to put a new motor in it. And not a rotary.

 

Someone shoot him, now.

 

Yes you need a new motor but not pistons.

 

Sorry don't shoot i cant afford another rotary, and im thinking of a lincoln mark 8 motor with a supercharger wana make this the perfect drag car bc of its weight.