Red7spear

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

My5ABaby

iTrader: (7)

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.

scrip7

iTrader: (6)

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.

Red7spear

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?

My5ABaby

iTrader: (7)

1k ohms at idle.

fcunderwater

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

-Six-

iTrader: (10)

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.