I just bought my second rx7 its a 87 turbo 2 i runs good at idle and full throttle but when you give it 1/4 to 1/2 throttle it hesitates but if you floor it , it goes fine what could be the problem grounding issue maybe ? or what should i check

 

Sounds like a TPS issue. Test your TPS via the resistance (Ohms) method and look for dead spots. It works best with a multimeter that has a needle as opposed to a digital screen.

 

5A is right.....the TPS can develop "dead spots" along it's range of operation, also the air flow meter and boost sensor can develop it as well. My boost sensor did and caused a hesitation on accel. I was unable to see the "glitch" with a multimeter but I did see it with my lab scope, which is the best way to test these sensors. Realizing that most people don't have access to a lab scope, your best bet is to backprobe the signal wires from these sensors with a multimeter and hope to find the dead spots. The wiring diagrams in the FSM would be helpful, as well as doing a search in the forum for proper grounding of all components.

 

I will check the tps and see if thats the case. What sould the tps be set at if it ends up being that and i need to install a new one?

 

1k ohms at idle.

 

or if your really rolling in the dough you could get an oscilloscope. That would work better than a DMM.

 

That's the only thing that would really work well, if you are looking for dead spots. It is pretty tough to get an accurate read just using a mulitmeter, since it is not reading fast enough to give you the same picture an oscilloscope would.

Edit- did some quick google searching and found this PC based oscilloscope: http://www.dynoninstruments.com/common/s2x100.php

I'm assuming one could use a laptop with this thing to diagnose, and it is very affordable ($250) Interesting. Sorry if I am getting off topic.