Notices
General Maintenance & Repairs Leaks | Squeaks | Clunks | Rattles | Grinds

RPMs drop very low when coming to a stop

 
Old 04-23-2019, 10:05 AM
  #1  
Teching In
Thread Starter
 
Join Date: Jan 2018
Posts: 25
Default RPMs drop very low when coming to a stop

My car has a manual transmission, and when I press the clutch pedal in, or take the car out of gear when I am coming to a stop, the RPMs drop quickly to around 500, at which point it shuts off the alternator, the battery voltage drop almost to red, and the lights dim. The RPMs will bounce back and forth between 500 and 850 until I have come to a complete stop. Once stopped, the car idles like normal, and the battery voltage comes back up. Does anyone have any idea what would cause this? I assumed it may be a vacuum leak somewhere, but I used a smoke machine and was unable to find a leak anywhere.
AnotherDeadCylinder is offline  
Old 04-23-2019, 10:50 AM
  #2  
Teching In
Thread Starter
 
Join Date: Jan 2018
Posts: 25
Default

I also forgot to mention that I replaced the IAC Valve, so that has been ruled out.
AnotherDeadCylinder is offline  
Old 04-25-2019, 01:28 PM
  #3  
TECH Regular
iTrader: (2)
 
Join Date: Jul 2003
Posts: 439
Default

reading this and from your other post it really sounds like you should check misfire/spark issues.... coil(s) about to go maybe?
pillagenburn is offline  
Old 04-25-2019, 03:16 PM
  #4  
Teching In
Thread Starter
 
Join Date: Jan 2018
Posts: 25
Default

Originally Posted by pillagenburn View Post
reading this and from your other post it really sounds like you should check misfire/spark issues.... coil(s) about to go maybe?
They're actually two separate cars, but it's definitely worth checking out. Plugs and wires on this car were replaced a few months back, so I'll have to take a look at the coils. Thank for the input!
AnotherDeadCylinder is offline  
 


Thread Tools
Search this Thread

About Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service

© 2019 MH Sub I, LLC dba Internet Brands

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.
 
  • Ask a Question
    Get answers from community experts
Question Title:
Description:
Your question will be posted in: