hi, does anyone know what's wrong with my car, after it runs hot, when the car is idling , the Rpm of the car goes up and down from 500 to 900 rapidly, and the sound from the engine like the monster is cranking, can anyone tell me what's wrong and does POWER fc could help ??? please advise

thanks

 

are your aux fans coming on?

 

Is the car stock? What's the history of the car (engine miles, any work done on it lately, how long has this problem existed)?

 

Check your TPS reading when it's fully warmed. When your car heats up, the voltage goes up. You may be fine when cold, the heat may put your TPS voltage out of spec.

 

Check your clutch switch for the idle problem. If the prong is stuck in, you idle will be effected.

 

Front mount intercooler, 80000 miles, twin power, exedy clutch, i meant runs hot, meant that drive for long time or runs high RPM, not warming up, when the RMP goes up and down in the N, but if i put in 1st gear, so that the RPM is little bit stable, please help

 

SLOW DOWN!!!
please speak in a language we can understand.
ok so you drive for a long time and it does not warm up?
when the rpm goes up and down in neutral?
explain in full sentences and we will be able to help.

 

I had a similar prob and it was the LIM gasket. This was years ago so not sure if this will help. I may be totally off base.

 

you need to change your blinker fluid...worked for all the pesky problems i could never figure out

 

this happen only when the car was running hot, pull high RPM, and the RPM goes up and down in neutral, what's the LIM gasket though??? if I replace a new one, would it help??

 

Lower Intake Manifold...you want to eliminate all other possible solution before going to this one.

 

What exactly is blinker fluid?

 

what other things should i check, ??? i have no idea how to fix this problem,??

 

It's people trying to be funny.

If this only happens when the car is warm, I would start by checking the Idle Speed Controller. You can disconnect it as a test and see how the car reacts:

https://www.rx7club.com/showpost.php...6&postcount=12

 

Have you checked anything that was suggested? Diagnosing is a process of elimination, start with easiest solutions.

 

oh man tell me you didnt fall for that gem, silverTRD has been waiting months to bust that one out haha

 

so POWER fc WOULDN'T fix my problem???

 

Adam C: Where is the clutch switch located? Curious cause I have a little idle issue but it's not bad by any means it's just annoying that when I put in the clutch my cars idle will jump and the same when I put the car in neutral and roll to a stop. However the revs don't continue to jump after I do stop when I roll in neutral to a stop. Just been trying to figure out what my problem is for this but in no way does it affect driving so I haven't been to concerned but who knows it may be something worse then I think.

 

You shouldn't just put a Power FC on there without a properly running engine. It could possibly cause other significant problems.

 

My idle went crazy after installing the PFC. Turns out that the wire for the clutch sensor in the ECU wiring harness had been cut by a previous owner or an alarm installer (I have no idea why). I had idle issues on the stock ECU, but they just got worse on the PFC. Fix the problem before going to the PFC. It is definately a good ugrade when your car is ready.