my FC is only revving to 1500 RPM soem days and i dont know why. if somone could enlighten me that would be sweet, and how do i FIX that problem as well?

 

be more specific. What does it do? sputter?

 

its almost liek a computer cutout for some reason, it kind of chugs back down. and then i can gas it again.

 

something like this happened to me before (my car is an 88 na rx7)and then the problem just went away (guess it fixed itself), I had reason to believe it was something to do with the tps, so I would disconnect that and see if my car would rev up normally and it would be fine but then the problem would come back while i was driving it sometimes. Then after a while it just went away and has been fine ever since, I'm now over 1000 miles on my engine rebuilt by rotaryresurrection.com and lots of other mods and stuff by me.

 

ive put 3000 on this car and its still doing it randomly. problems dont jstu cure themselves. its frustrating. i think it may be related to cold weather.

 

well mine fixed itself somehow , I dont know how. But i would definitely check the intake hoses and all your wire connections for the maf and boost sensor etc. Make sure nothing is loose because im sure if it wasnt registering a maf it would want to cut out. Or maybe if the mafsensor is bad ? these are just my guesses, im not sure what it could be.

I think my car needs new sparkplugs and wires because it runs really rich and i bet it could use them even if its only been 1500 miles since i last replaced the plugs.

 

check the fuel pump mine would go and just sound like it stoped running no power nuthing then go again and not only when i turned it do it randomly

 

When in gear, can it go abovve 1500?

 

Your tps is bad, most ppl say that these cars run like crap without a tps. I had 2 gxl's and I ran them with no tps for a year and had no problems. And the car ran alot better without it actually.

 

how? would it run rich or? What is bad about unplugging the TPS? I cant get mine to work correctly, I still get some pretty bad bucking. Maybe I should try just taking it off.

 

I didn't plug my TPS on my old TII over 5 years,
I changed 3-5 different TPS and set million times and didn't cure the idle
problem, so I unplugged it , it ran better , just a slightly bucking when light throttle.
right now my TII has the same problem like yours,
when I plug the TPS , it can't rev above 2000rpm,
If I unplug it , it just likes normal

 

I just tried an unplugged TPS, my engine is louder, and ... the car seems more .....
"true" in a drift, but decel backfires and I have a weird miss or hesitation around 4.8k RPM.
any ideas? Im guessing its going to just throw fuel into the engine and make it very rich with no TPS, explaining the backfire?
I could be wrong though :notice the time: Its like 5:30 here AM haha

 

wait a minute, you guys are saying that you can run a FC with the TPS unplugged?!?!? thats awesome but i want to know hardcore before i do it because this is my daily.

 

no it cant

 

both my cars ran alot better without a tps, I guess im not the only one

 

awesome, how thehell do you remove it? and is it an emissions thing or soemthing?

 

removing the tps is as simple as disconnecting its power by unplugging the wire where it plugs in. The tps can be found on the throttle body, its black and its basically a black button that comes out as the throttle is opened and pushes back in when the throttle is closed. All you have to do is disconnect the wire where it connects into the wiring harness. Make sure you do this while the car is off and not on.

The tps tells the ecu how much gas the car needs dependant on how much throttle you are giving it. If not tuned properly or if bad, it will cause a crappy idle. Not sure about making the car run rich, but I'm sure it does because mine seems like its bad and runs rich too.

 

so then what of these reports of the TPS not bieing needed on my car? (87 fc)

 

The tps is not essential for the car to run thats all that means.

 

My car when I got it was doing the exac same thing. What it was is theres a ground on the firewall and the passenger side that goes down and connects to the bell housing. Make sure this ground is in place and has a good ground as if it doesn't the ecu sees it as a major issue and shut downs.

 

I had this issue as well. The solution I found was to lubricate the 2 plungers or buttons that are on the TPS. I used WD40 first, but that sucked. Next I tried power graphite. That worked like a champ. I have not had this problem since!

 

awesome ill try that, and where is the bell housing? because i a NOOB

 

Removing the TPS is just not right.

First of all the injectors will NEVER shut off while the throttle is closed coming down from revs. It wont go into closed loop mode. Will run more rich then it should which means your AFR could change for the bad.

If you ever wanted to run an SAFC, would never happen without the tps unless you hooked it up to the boost/pressure sensor which I wouldn't reccomend. I would install a S5 TB on a S4 engine and run the full range on the afc.

Sounds like a short in the TPS wires to me. Take some male and female spade connectors and run 3 wires from the TPS plug on the harness, to the plug on the TPS its self. make sure no wires are shorting and see if the helps.

If not. You can also, with some agrivation, remove the spade connectors from the TPS plug on for the TPS and the harness. Connect them individually and see if it goes away.

Also check your TPS with an OHM meter. Make sure there are no dead spots or pausing while moving the plunger, in ot out.

I have found on the cars I work on, that S4s like 0.95-1.00K ohm TPS adjustment. S5s I found like 1v and nothing else.

How do you know the TPS is bad? did you test it over the internet?

I ran without a TPS on my car for a few weeks years ago too but the car didn't run smooth at all.

Its an electronic, liquid lubricants should never be used

What? The ECU doesn't SEE this ground nor does it see ANY ground. That ground simply helps to continue the ground through the chassis so the chassis can be grounded as well since the main ground from the battery bolts to the bolt near the starter.

some vehicals don't run very well with this ground disonnected or corroded since its a pretty important straight forward ground.

 

The bell housing is what blots the trans to the engine. So just look on the back side of the motor. the ground runs from the top on the fire wall down to the bell housing.

 

whats tps? new to rotory and cars lol