skyhighclaw

Hey all! I posted this questions in the dumb questions thread and didn't get any responses there so I'm asking here. If this isn't the correct thread I apologize, let me know ill move/ delete it.

I'm trying to figure out a issue I'm having with my 2005 Rx8. When I'm in gear the rpm's keep bouncing between 1.5K and 1K in a almost rhythmic pattern, and it only does this when I'm in gear and the clutch pressed in. When its in neutral the idle is just fine without issue, and when I give it gas it runs fine as well, the RPM's only move around if it's gear and the clutch is pushed in.

There's no CEL for this issue(not yet anyway) I tried searching for a answer and I'm having a hard time finding it, my research states it seems it could be either the clutch pedal position switch or a bad neutral switch or something else, but tbh i have no clue.

Any advice would be greatly appreciated

Loki

iTrader: (1)

Sounds like clutch pedal is out of adjustment and the clutch isn't fully disengaging. The pedal has an adjustment screw, you need to raise the engagement point a little.

A quick way to confirm this: on level ground hold clutch in and put it in 1st. Does the car creep forward?

Mr_Insulin

Sounds like the clutch safety switch needs to be replaced.

skyhighclaw

Hey! sorry for the late response but the car doesn't creep forward at all. odd thing is, if i give it a tiny bit of gas its fine, no bouncing. in neutral its fine, doing nothing with clutch fully depressed, it moves.

I hope that's the case. researching that part looks fairly cheap. i just had my clutch replaced a month or 2 ago and that costed me a pretty penny. Think that could be related in any way?

Also ,i have a video of the issue. Please ignore my childish sense of humor.

skyhighclaw

Good News everyone!

Turns out Mr_Insulin was correct, it took forever but my car finally through a CEL, P0704, bad clutch switch!

Thanks for the advice!

MCCRX8

I'm having the same thing going on but I have no idea where the switch is. Recently my safety switch went bad and my friend I bought the car from just hard wired it and now I don't have to press the clutch in to start it up. Not sure if that has anything to do with it though.

skyhighclaw

I'm not much of a mechanic so take my advice with a grain of salt(i was asking for help here to begin with!), but it seems like this should be it (the item circled in red).