View Full Version : Rough idle: 500-800 rpms

02-25-2012, 12:23 AM
I bought a 2000 Celica GTS with 155,000 miles on it (a lot I know) and so far I absolutely love it! I've had it for about a month now and fixed most of the minor issues. The issue I face now is that my idle is really low. I seafomed my Oil (yes, I changed my oil), Gas, and intake; which helped a little bit I guess. I haven't noticed any vacuum line leaks, though I'm not always sure which are vacuum lines and which are coolant lines. I also replaced my spark plugs and air filter. I reset my ECU and it hasn't seemed to help other than it doesn't try to jump up again by kicking on the radiator fans, which is what I noticed it does when it tries to save itself from dying. One last thing, when I got it the MAF threw a CEL which I fixed by cleaning the MAF.

So my questions would be: What's your average warm engine idle? Have you experienced this issue? I've read someone suggested to clean my throttle body, does that sound right? Lastly, any suggestions?

Thank you for reading! I love my Celica!

02-25-2012, 05:18 AM
Mine idles at 800rpm.

Try cleaning your idle control valve under the throttle body.

03-15-2012, 03:17 PM
750-850 is normal

03-15-2012, 03:18 PM
if low idel, you may want to do a tune up.

03-15-2012, 06:56 PM
Mine idles + or - 100 from 1,000 RPM. Clean the throttle body, and install a new air filter. See if that helps.

03-15-2012, 07:45 PM
My swap idles around 1000 +/- as well.

Our mazda idles around 600/650, 750 with the AC on.

03-15-2012, 09:03 PM
+1 to cleaning the TB and idle valve.

I assume no check engine light before and after ecu reset.

03-15-2012, 10:22 PM
Vacuum leak can also cause pooptastic idling, if the IACV and general cleanup don't help.