Hi guys,

I've been having bucking issues with my rx7 (1987 TII) and I've looked around the site and it seems to point to the tps. I tried to adjust the TPS via measuring the resistance in ohms but it did not read any resistance when I measured, only volts. I adjusted it for voltage to 1 volt at closed throttle but it only measures 4.67 at WOT.

Can anyone give some input? Is the TPS bad because it didn't read any resistance? Is it bad because it only measures 4.67 volts at WOT?

Thanks in advance.

 

At most it would read 5 volts when fully extended so your reading is proper.

 

Try setting via Aaron Cake's method (link below). If you want to set using resistance you need to unplug the tps connector.


https://www.rx7club.com/showthread.p...hreadid=235007

 

also, during cold start up, there is no cold start (rev to 3k for ~10 seconds). instead it idles normally as any other car would.

Is something wrong with my bac?

 

The high rev cold start is based upon the coolant temp. If the temperature is too cool then the system is overridden and does not occur so your car is acting normal. If the same thing occured to you during the dog days of summer then it would indicate some type of problem.

 

My TPS was sticking on occasion, this caused the car to basically idle well but fall on its face when accelerating. very frustrating when your in traffic! I replaced it set the resistance to 1 Ohm per Arron Cake and the car was fine. I looked at my old TPS and noticed it was not aligned in the center which was causing it to stick. A little tweak on the vise and it was fixed and put away as a spare.

 

I thought the high rev cold start starts when the engine is cold? Do you mean "If the temperature is too hot"? Because it isn't working at all, then again the car has been sitting around waiting for me to fix it.

 

If you reread what was stated is says the high rev start is based upon the coolant temp. Either the coolant is too cold for the High rev or it isn't. If the coolant temp is too cold then it won't work on a cold start regardless of the situation because it's not designed to high rev if the engine is too cold to protect the engine from being damaged by a high rev. The coolant temp needs to be about 60 degrees or warmer on a cold start or it's not going to work, the high rev that is. Once the car has been used then the high rev won't engage because the car is not being cold started. A cold start is the first start of the day. Drive the car, park it and come back out and start the car after it has been sitting for an hour or so and the high rev will not engage because the car is not being cold started.

 

Ah gotcha thanks.