Idle high on start
 

I have an idle problem with my s5 rx7 fc NA, when I turn on my car the RPMs shoot up to 4K and to bring it down to normal RPMs I have to rev it. What could be the cause? Thank you

When started the engine should run at about 3000 RPM for about 15 seconds, then fall to around 1500 RPM, then gradually decrease to a final idle of around 750RPM.

By blipping the throttle you cancel the 3000 RPM startup.

Does it hang at high RPM until you touch the throttle? Or if you wait, does it drop down on its own?

When I turn the car it goes to 3500 rpms and then drops to 1500rpms and finally 900rpms
The idle does drop even if I don't touch the gas pedal.
What could be the problem?
Thanks

Nothing, thats normal

Thank you

The Factory Service Manuals for all years of RX-7 (and many other rotary cars) can be downloaded for free here: Foxed.ca - Mazda RX-7 Manuals . They contain all common service information and more, and are an essential tool for any sort of service work that needs to be performed on these cars.

Additionally, the Haynes service manual for the 1986 thru 1991 RX-7 (both turbo and NA) can be found at most local auto parts stores or purchased from any good bookstore (ISBN number 1 56392 007 7). It is only about $25 and is a great quick reference for things like this. Not only does it contain most of the information in the FSM condensed into an easy to read format, but it includes full wiring diagrams as well.

These manuals will answer 99% of service related questions for the car and if you intend to do your own repair work, you will need at least one of them. Preferably both, since the FSM is a free download. The Haynes is a good quick reference covering 99% of questions, while the FSMs show complete and detailed procedures.

You have that whole thing saved in a word file so you can just copy and paste don't you?