Home Menu

Site Navigation


Toyota 4Runner Forum - Largest 4Runner Forum > > > rough idle
User Tag List

Reply
 
Thread Tools Rate Thread Display Modes
Old 11-22-2005, 01:13 PM #1
feloniousQ feloniousQ is offline
Junior Member
  
Join Date: Jan 2004
Location: Raleigh, NC
Age: 42
Posts: 16
feloniousQ is an unknown quantity at this point
feloniousQ feloniousQ is offline
Junior Member
 
Join Date: Jan 2004
Location: Raleigh, NC
Age: 42
Posts: 16
feloniousQ is an unknown quantity at this point
rough idle
I have a '01 SR5 4wd with 88k miles. Lately I have noticed that after cranking the truck and letting it warm up, that the RPMs intermittently drop (down to around 500rpm or below) when it is in gear and at idle speed. This is causing some engine shake when stopped at a red light or in traffic, etc.

Anybody have any ideas why the RPMs would start consistently dropping like that? I have had the truck since 33k miles and have not changed the plugs or wires. However, there is no associated spark knock or loss of power or any other reason for the plugs to be suspect.

Anyone have any suggestions on how to figure out what the problem is?? Anyone else had any similar problems?

Thanks
feloniousQ is offline   Reply With QuoteReply With Quote
Old 11-22-2005, 01:22 PM #2
alotawatts's Avatar
alotawatts alotawatts is offline
Member
  
Join Date: Oct 2005
Location: nw
Posts: 72
alotawatts is an unknown quantity at this point
alotawatts alotawatts is offline
Member
alotawatts's Avatar
 
Join Date: Oct 2005
Location: nw
Posts: 72
alotawatts is an unknown quantity at this point
Only guessing...vacuum leak ? check all of the small rubber hoses. IAC intake air control valve ?
__________________
2001 SR5 2WD Real chrome bumpers what a concept !
alotawatts is offline   Reply With QuoteReply With Quote
Old 11-22-2005, 01:26 PM #3
greasefingers's Avatar
greasefingers greasefingers is offline
Senior Member
  
Join Date: Aug 2004
Location: Northern VA
Posts: 1,944
greasefingers is on a distinguished road
greasefingers greasefingers is offline
Senior Member
greasefingers's Avatar
 
Join Date: Aug 2004
Location: Northern VA
Posts: 1,944
greasefingers is on a distinguished road
What are you waiting for? The truck needs a tune-up before trying to diagnose any further. And I am sure that your MAP sensor is dirty as well.
__________________
2003 4x4 Sport 4runner V8 with 287k miles and counting
2015 Lexus RC350 F-sport
greasefingers is offline   Reply With QuoteReply With Quote
Old 11-22-2005, 09:28 PM #4
mikes4runner's Avatar
mikes4runner mikes4runner is offline
Senior Member
  
Join Date: Jan 2004
Location: Hanover,PA
Age: 53
Posts: 1,185
mikes4runner is on a distinguished road
mikes4runner mikes4runner is offline
Senior Member
mikes4runner's Avatar
 
Join Date: Jan 2004
Location: Hanover,PA
Age: 53
Posts: 1,185
mikes4runner is on a distinguished road
Quote:
Originally posted by greasefingers
What are you waiting for? The truck needs a tune-up before trying to diagnose any further. And I am sure that your MAP sensor is dirty as well.

I think you mean the MAF(Mass airflow sensor).

oh yes 88K and this has never been cleaned is most likley your problem.

Try cleaning the MAF first cheap and easy to do.



Mike
__________________
01 MR2,96 Vette,93 4runner
mikes4runner is offline   Reply With QuoteReply With Quote
Old 11-22-2005, 10:58 PM #5
feloniousQ feloniousQ is offline
Junior Member
  
Join Date: Jan 2004
Location: Raleigh, NC
Age: 42
Posts: 16
feloniousQ is an unknown quantity at this point
feloniousQ feloniousQ is offline
Junior Member
 
Join Date: Jan 2004
Location: Raleigh, NC
Age: 42
Posts: 16
feloniousQ is an unknown quantity at this point
mass air flow sensor and O2 sensor replaced about 4 months ago.

i plan on running some fuel injector cleaner (done), recharging my K&N (done today), and changing the plugs and see how that helps
feloniousQ is offline   Reply With QuoteReply With Quote
Old 11-22-2005, 11:02 PM #6
mikes4runner's Avatar
mikes4runner mikes4runner is offline
Senior Member
  
Join Date: Jan 2004
Location: Hanover,PA
Age: 53
Posts: 1,185
mikes4runner is on a distinguished road
mikes4runner mikes4runner is offline
Senior Member
mikes4runner's Avatar
 
Join Date: Jan 2004
Location: Hanover,PA
Age: 53
Posts: 1,185
mikes4runner is on a distinguished road
Quote:
Originally posted by feloniousQ
mass air flow sensor and O2 sensor replaced about 4 months ago.

i plan on running some fuel injector cleaner (done), recharging my K&N (done today), and changing the plugs and see how that helps
Is the K&N filter lubed with oil if so try cleaning the MAF. they can get dirty quick.

Mike
__________________
01 MR2,96 Vette,93 4runner
mikes4runner is offline   Reply With QuoteReply With Quote
Old 11-23-2005, 11:19 AM #7
greasefingers's Avatar
greasefingers greasefingers is offline
Senior Member
  
Join Date: Aug 2004
Location: Northern VA
Posts: 1,944
greasefingers is on a distinguished road
greasefingers greasefingers is offline
Senior Member
greasefingers's Avatar
 
Join Date: Aug 2004
Location: Northern VA
Posts: 1,944
greasefingers is on a distinguished road
Oops sorry about that, my Jeep has a MAP sensor and the T4R has a MAF sensor.

It would be more efficient to receive all pertinent information in the first post. Leaving out the fact that a new MAF & O2 sensor was installed, only leads us to guessing instead of more effective trouble shooting
__________________
2003 4x4 Sport 4runner V8 with 287k miles and counting
2015 Lexus RC350 F-sport
greasefingers is offline   Reply With QuoteReply With Quote
Old 01-02-2006, 12:05 AM #8
feloniousQ feloniousQ is offline
Junior Member
  
Join Date: Jan 2004
Location: Raleigh, NC
Age: 42
Posts: 16
feloniousQ is an unknown quantity at this point
feloniousQ feloniousQ is offline
Junior Member
 
Join Date: Jan 2004
Location: Raleigh, NC
Age: 42
Posts: 16
feloniousQ is an unknown quantity at this point
update
Just to update the situation - I got some time to get into the engine, and the throttle body was completely gunked up. Cleaning it out with some engine cleaner and a toothbrush completely resolved the idling issue. I also changed the plugs for good measure and she purrs like a kitten
feloniousQ is offline   Reply With QuoteReply With Quote
Reply

« Previous Thread | Next Thread »

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts
BB code is On
Smilies are On
[IMG] code is On
HTML code is On
Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
1995 4Runner rough idle soupie Maintenance/Detailing 1 10-12-2010 04:41 PM
intermittent rough idle doug2004toyota 4th Gen T4Rs 3 12-19-2008 08:53 PM
rough idle markdifferent Classic T4Rs 13 11-16-2006 06:22 PM
Rough Idle, Codes 25,26 Paulc Problems & Warranty Issues 0 02-22-2006 08:25 PM
91 4 Runner runs rough at idle in gear stearnes3462642 Problems & Warranty Issues 2 08-21-2004 05:21 PM

» Follow Us!!!
» Log in
User Name:

Password:

Not a member yet?
Register Now!
Powered by vBadvanced CMPS v3.2.2

All times are GMT -4. The time now is 08:27 AM.

Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2024, vBulletin Solutions Inc.
Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2024 DragonByte Technologies Ltd.
Feedback Buttons provided by Advanced Post Thanks / Like (Lite) - vBulletin Mods & Addons Copyright © 2024 DragonByte Technologies Ltd.
User Alert System provided by Advanced User Tagging (Lite) - vBulletin Mods & Addons Copyright © 2024 DragonByte Technologies Ltd.
***This site is an unofficial Toyota site, and is not officially endorsed, supported, authorized by or affiliated with Toyota. All company, product, or service names references in this web site are used for identification purposes only and may be trademarks of their respective owners. The Toyota name, marks, designs and logos, as well as Toyota model names, are registered trademarks of Toyota Motor Corporation***Ad Management plugin by RedTyger
 
Toyota - 4Runner . org Forum Terms and Privacy Policy
Copyright © 2020