TimeFlip

Damn, i can't seem to fix my poor start or idle no matter what i check. It's too many things that could've gone bad. I have an 87 GXL that refuses to start when cold, i have to depress the accelerator for 5 minutes until it will get warm and idle on its own. Then the idle will stumble from 1500-950 rpm over and over. When i turn on the A/C it goes to 1000 rpm. When i unplug the TPS it goes down to 1000 rpm too. But if i depress the plunger on the TPS it'll bounce from 1000 to 600rpm almost stalling.
All this sh*t is so confusing i dunno if it's the TPS, dashpot, thermowax, fast idle cam, AFM, AWS or Bypass air Valve. I'm almost ready to give in and get a 5.0 mustang. The engine was from a wrecked 88 GXL. Some shop that didn't know alot about rotary engines put it in. But before that the engine was sitting outside their shop for 3 weeks before they actually decided to put it in. So it was exposed to rain and everything. Now it runs like crap. I just need to know ALL possible demons to rule out before i decide to sell my pride and joy.

VashtheStampede

the cycling idle sounds like a bad thermowax to me.
as for the TPS, there is an easy way to test it and adjust as well.
it takes 2 minutes, a multimeter, and a screwdriver. but heres the link
this writeup is for a turbo car, but i believe it to be the same for NA's

http://k2rd.freeservers.com/FC3S/TPS/tps.html

Antonio

Sometimes you just have to take it to a shop and have them do it. Where in Miami are you?

PaulC

damn dude that sucks. I would be askin for help too.

7Rebel

I wouldn't get tooooo down on your car .... Remember they are around 15 years old. My car is going through a lot of little problems. I'm just trying to fix them one at a time till she is perfect!

I am sure if you put the work into this car and make it perfect (In your opinion) you will get a lot more enjoyment out of it than some mustang

7Rebel

One more thing .... I have the stumbling idle too .... This week I used some chevron with techron fuel injector cleaner additive. Although it didn't fix it ... I did notice a little improvement

supergoat

my idle recently developed a bit of a stumble. I put new spark plug wires on and it is smooth as silk now.

TimeFlip

I'm in the miami shores area, on 10ave. NW 100ST. just off of i-95.
I took it to some rotary shop on 36 ST and i don't think the guy there knows a clue of what he's doing. I took the car to him three times and it still runs idles like sh*t. All he does is adjust the idle screw on top the TB and that's it. He sucks ***. I'm thinking of starting over and getting an S13 or another FC, one with less problems.