People with heavily modded cars

[TIM TIM TIM]

does anybody know how to read? he didnt say anything about when his car starts up. All cars idle high when there cold, my integra, mustangs, civics and the rx8 all do it. He is talking about once it is steady and low, it will move a little bit. its just because your car is loud that you really notice it, the rx8 does it quite a bit too (not jump alot, just does it often). Im pretty sure your fine.

[omgwtfbbq!]

my lil honda only has intake and header, and when i start it is rather high, 1500, almost 2000 sometimes, but if i let it warm up it goes to 1000, but sometimes its still at 1500/2000 not sure why

Your idle is too high. According to your owners manual, it should be 1500 on warm up, then drop to 750-800 for normal operations.

To the OP, Idle problems can put you in the crazy house. As long as your car idles by itself, I wouldn't worry about jumps. Its pretty rare to see a modified car, or even an older car idle evenly.

[homemade wrx]

I won't comment as I have big cams and a long rod motor, big bore boxxer engine
steady but not smooth...they aren't smooth from the factory

[RX007CYM]

Once warmed up, my idle is solid. +/- 100 rpms is no biggie. Now my stock 2000 626's idle jumps all over the place. I believe it is the O2 sensor, just haven't felt like replacing it to find out (Not to mention I will probably be trading it within six months). 900 one moment, 750 the next, and then it takes a dip down to 500 and stays there for a little bit and then it decides to bounce around some more.

[B20.eg]

i couldnt get a steady idle on my old gt-42 haltech FC to save my damn life!

but now, on my 377hp integra, my idle is smooth as glass(*cough*JOHN VEGA*cough*) with the random pop.

plus, i think a decently ported rotary should have some lope to it, its the rotary sound.

[Kirk]

My car idles smooth at 900 rpms.. gt4276, aem ems, etc..

[GsT Racer]

i got bigger cams and dsmlink, gm maft, etc. my idle is pretty decent. I have it set to 1100 rpms, and it bounces about +/- 50 rpms.

As long as everything on your car is in good working order, like all sensors working, no vaccuum/boost leaks, everything tight, I wouldn't worry about it, sounds normal. No car will ever idle as good as a brand new accord

[nate91si]

I idle 1000cc (95lb/hr) at a rock solid 950 RPMs...

piston engine

[Digger_228SC]

I sounds to me like there may be a small vacuum leak somewhere. Those are easily found with a squirt of Dawn dish washing detergent in a glass of water, then gently pour the water over vacuum hoses and connections and see if you get any bubbling. Maybe a sticking PCV valve also.

[Miata GT]

What do you consider heavily modded? If you've bridged the ports then you would know enough to answer your own question.