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Old 06-28-2016, 02:41 PM   #1
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Engine RPM dropping below normal idle??

My cars RPM has been dropping below normal idle when I shift into park or from reverse into drive. Sometimes drops as low as 300-400 rpm and then back up to normal. Anyone know what might be wrong? Thanks
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Old 06-28-2016, 02:46 PM   #2
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Old 06-28-2016, 03:04 PM   #3
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Are we supposed to guess what car your drive?

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Old 06-28-2016, 03:07 PM   #4
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Given the user name I have to ask, does this only happen when you are running into shit?
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Old 06-28-2016, 03:30 PM   #5
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Have you hit and run recently?
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Old 06-28-2016, 03:32 PM   #6
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Same thing happens with my car, although it doesn't drop THAT low. I cleaned the TB and it helped a lot, could be caused by so many different things though.
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Old 06-28-2016, 03:40 PM   #7
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Old 06-28-2016, 03:41 PM   #8
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Are we supposed to guess what car your drive?

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Old 06-28-2016, 04:00 PM   #9
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Same thing happens with my car, although it doesn't drop THAT low. I cleaned the TB and it helped a lot, could be caused by so many different things though.
Could possibly be heat soak? My car was doing it back in April/May when it was really hot
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Old 06-28-2016, 04:59 PM   #10
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With little data to go on, when was the last time you did any maintenance it and what was done?

The cause could be a variety of things...
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Old 06-28-2016, 05:42 PM   #11
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With little data to go on, when was the last time you did any maintenance it and what was done?

The cause could be a variety of things...
I always do the basic fluid changes but havent touched tranny fluid for about 70k now. It has about 150k on it and I daily this car but for the past 2 months it was parked and I noticed this happening after i started driving it again 2 weeks ago. Would anyone recommend trying Seafoam ?
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Old 06-28-2016, 11:34 PM   #12
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Does your car ever stall out while it's idling from dropping rpms so low?

Last winter, my Mazda3 had an issue where it sometimes would stall itself out while idling.
Turned out I had to replace the Purge Solenoid Valve
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Old 06-29-2016, 12:20 AM   #13
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Could possibly be heat soak? My car was doing it back in April/May when it was really hot
I have full I/H/E with no tune, I've read and been told that it could potentially be non-ideal AF. Could be timing as well, or TB, or trans fluid, or a whole other list of things. Although I know for certain back when the car was devoid of any modifications, it never did this, which leads me to believe it's probably AF, in my situation at least.

If it makes a difference, my car has stalled before shifting from P to R and R to D not even a manual.

Try cleaning the TB, if your car is anything over 100k, chances are your TB is quite dirty. TB cleaner is cheap, buy a can and clean it, it doesn't hurt anyway.
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[13-03, 11:25] MG1 when you hit the brakes, it shoots cum at pedestrian - bukkake

[12-03, 19:06] meme405 That e30 is so mexiflushed I thought we were in albuquerque

[12-03, 23:03] rb when i see a modded element. I have nothing but respect. either the parents kicked him out or the guy is killing hookers in the back
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Old 06-29-2016, 03:16 AM   #14
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Sorry thread jack, there are headers for Honda Element? Cool!
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Old 06-29-2016, 11:13 AM   #15
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Quote:
Originally Posted by AzNightmare View Post
Does your car ever stall out while it's idling from dropping rpms so low?

Last winter, my Mazda3 had an issue where it sometimes would stall itself out while idling.
Turned out I had to replace the Purge Solenoid Valve
no it hasn't stalled yet just dips down and then goes back up. Gonna try cleaning the throttle body, anyone recommend a good brand?
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Old 06-29-2016, 12:32 PM   #16
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Try cleaning your Idle Air Control Valve along with your TB.
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Old 06-29-2016, 01:35 PM   #17
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If it consistently dips to a lower level it might be emissions related.

^+1 on the IACV

Does it ever drop when its cold?
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Old 06-29-2016, 07:30 PM   #18
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Sorry thread jack, there are headers for Honda Element? Cool!
Any K swap long tube works

Also, IACV didn't work for me. I changed it at around 310,000kms and it didn't help at all, but cleaning the TB made a huge difference.
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[13-03, 11:25] MG1 when you hit the brakes, it shoots cum at pedestrian - bukkake

[12-03, 19:06] meme405 That e30 is so mexiflushed I thought we were in albuquerque

[12-03, 23:03] rb when i see a modded element. I have nothing but respect. either the parents kicked him out or the guy is killing hookers in the back

Last edited by Akinari; 06-29-2016 at 08:17 PM.
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Old 06-29-2016, 11:34 PM   #19
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If it consistently dips to a lower level it might be emissions related.

^+1 on the IACV

Does it ever drop when its cold?
No it hasnt happened yet while the cars still cold. And I also noticed it only started happening once the weather got warmer recently.
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Old 06-30-2016, 12:39 AM   #20
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If you're going to clean the TB, wouldn't hurt to do an idle air relearn
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