Hey guys I just picked up this 86 a few days ago for 600 bucks and its a project. when I bought it it wouldn't stay running. I got it to my place and found a bad coil and a semi plugged fuel filter. I replaced both and now it stats and will idle but won't accelerate. If you push the throttle and raise the rpm to around 2000 rpm it will bog down and act like a rev limiter and bounce from 800 to 2000 rpm. When I first start it up I can hit the throttle and it will work great but after about 10 seconds it stats with the trouble. I've checked the basics and everything seems to check out. What an I missing??? No engine light on either.
Thanks in advance, kevin

 

hmmm... haven't heard of this one yet. Does it bog down because it is running rich? (ridiculous fuel smell and black smoke from the ***) or maybe it's not getting adequate spark? I'm not well versed on the NA and 6 port induction systems, so something funky may be going on up there as well...

 

Would it be possible for you to post a video? I had this happen before on my 86 but I can't remember for the life of me right now what it was. Was the car sitting for a while? How many miles are on it? This could be a one of several things to do with either idle adujustment and or fuel. I recommend looking here https://www.rx7club.com/2nd-generation-specific-1986-1992-17/frequently-asked-questions-2nd-generation-rx-7-faq-fc-494667/ there is alot of great info in there. Look under the hood for wires not plugged in to it could be that simple.

 

I just remembered something check to make sure your CAS ( crank angle sensor ) is adjusted properly. If it is adjusted way to high or low I am pretty sure that would limit the rpms. I'm not saying I know for sure I would go out to my car and test it right now but I am working lol.

 

Thanks a lot guys. I checked all of that and I think its the tps that's causing the problem. The problem seems to go away when it gets warm. I of course started with the basics and it has strong spark and a 35-40 psi running fuel pressure. I'm amazed at how expensive everything is for these cars! The freakin tps us 230 bucks!! Weak.

 

Glad to hear your gettin er figured out.

 

you just gotta look around for a used one! haha got me a good working tps for 15bucks on the forums. searching or asking around will help you in the long run

 

Im fairly new to my rx and s4's but from my understanding there is no check engine light. You would hear a series of beeps, no light.?

 

Don't know bout the idiot lights, since I use a standalone EMS. But I might have a TPS sensor to sell ya, will have to check my parts bin .

 

S4s have no engine light but there is an led tool to check for codes and you can make one.. S5s do have an engine light and there is procedure for checking the amount of flashes of the light.

Your problem sounds to me like a tps issue. There is a procedure for checking and setting it as well. One involves a multimeter and one involves the same led tool for checking codes.

 

Oh man! If you did have a tps I would be so happy. Let me know what you find and I'll buy it from you. Thanks man

 

You do not have to buy a new TPS yet as I just posted. Search up "How to set your TPS" follow the instructions and if its out of spec replace it.

 

I'll check into that. Thanks

 

There are 3 wires running to the TPS. One of these wires is Green/Red. This wire needs to read 1 volt with key to "on" and when the engine is fully warmed. Red multimeter lead gets stabbed into the back of the TPS plug where the G/R wire resides and the black meter lead goes to a ground such as the negative battery terminal. There is a screw encased in a spring at the front of the throttle body that is part of the throttle linkage. This is the adjustment screw for the TPS if it isn't correctly set to 1 volt spec. If the TPS is in need of adjustment then carefully turn the screw til the meter reads 1 volt and be careful not to press down on the adjustment screw when adjusting or it will interfere with the adjustment process. Again, the engine needs to be fully warmed up before the TPS is set and the key to on to take the 1 volt reading.

 

Satch does the initial set coupler have to be jumpered out for that one? Thats what the FSM says.

 

Not for setting the TPS. The coupler would be jumpered when setting the idle, and timing if I remember correctly.

 

Not sure if its ok to post a pic of it in here but I figure I owe it to all that have helped me to at least show you my new project. Let me know what you think and any ideas you might have. The paint is a lil rough but that is all going to be taken care of in the next month or two.
Thanks for all your help guys!

 

I assume a mod moved my pic. Thanks guys! Sorry for the trouble.