Car Revs Up And Down on its own - AcuraZine Community

Go Back   AcuraZine Community > AcuraZine TL Community > Second Generation TL (1999-2003) > Problems & Fixes
Sign in using an external account
Register Forgot Password?
Search

Reply
 
 
 
submit to reddit
 
LinkBack Thread Tools Search this Thread
Old 02-04-2010, 6:43 PM   #1
Registered Member
 
Trader Rating: (0)
Join Date: Aug 2008
Posts: 5
Thanks: 0
Thanked 0 Times in 0 Posts
Points: 2,254, Level: 28
Points: 2,254, Level: 28 Points: 2,254, Level: 28 Points: 2,254, Level: 28
Activity: 0%
Activity: 0% Activity: 0% Activity: 0%
Car Revs Up And Down on its own

My 02 TL sat for about 4-5 months. I probably started like 3-4 times during that time. The last time I started it it ran fine for about 3 minutes than just started revving up and down. It revs down till it sounds like its about to stall and than shoots up. Up and down up and down. Even when Im driving if I just coast it does it.Im not sure what it should normally idle at but when im sitting at a red light I can feel more pressure on the brake pedal like the idle is running way to high, its at 1100rpms. I took out the IACV and cleaned it, still does the same thing.... Any Ideas?
This ad is not displayed to registered or logged-in members.
Register your free account today and become a member on Acurazine!
whistlekleen is offline   Reply With Quote
Old 02-04-2010, 7:15 PM   #2
Thread Police Chief
 
adamlee05's Avatar
 
Trader Rating: (0)
Join Date: Jul 2006
Location: Nashville, TN / Huntsville, AL
Age: 28
Posts: 1,391
Thanks: 0
Thanked 1 Time in 1 Post
Points: 7,480, Level: 57
Points: 7,480, Level: 57 Points: 7,480, Level: 57 Points: 7,480, Level: 57
Activity: 0.3%
Activity: 0.3% Activity: 0.3% Activity: 0.3%
Could be the MAP sensor, its located on the rear intake plenum.
__________________
Patrolling the 2G-TL Forums since 2006

3.5-S 6MT in progress
adamlee05 is offline   Reply With Quote
Old 02-05-2010, 8:55 AM   #3
Senior Moderator
 
fsttyms1's Avatar
 
Trader Rating: (0)
Join Date: Aug 2002
Location: Appleton WI
Age: 39
Posts: 76,276
Thanked 2,020 Times in 1,469 Posts
fsttyms1
Points: 99,710, Level: 100
Points: 99,710, Level: 100 Points: 99,710, Level: 100 Points: 99,710, Level: 100
Activity: 68.9%
Activity: 68.9% Activity: 68.9% Activity: 68.9%
Quote:
Originally Posted by adamlee05 View Post
Could be the MAP sensor, its located on the rear intake plenum.
Doubtful,

Its probably still the Idle Air Control Valve, or a vacuum leak. If the idle is reving up and down or high its usually one of those. It may also be a TPS sensor

Last edited by fsttyms1; 02-05-2010 at 8:57 AM.
fsttyms1 is offline   Reply With Quote
Old 02-05-2010, 10:58 AM   #4
Registered Member
 
Trader Rating: (0)
Join Date: Nov 2009
Posts: 386
Thanks: 0
Thanked 2 Times in 2 Posts
Points: 2,636, Level: 31
Points: 2,636, Level: 31 Points: 2,636, Level: 31 Points: 2,636, Level: 31
Activity: 0%
Activity: 0% Activity: 0% Activity: 0%
I vote for the TPS
rcb2000 is offline   Reply With Quote
Old 02-05-2010, 11:05 AM   #5
Senior Moderator
 
fsttyms1's Avatar
 
Trader Rating: (0)
Join Date: Aug 2002
Location: Appleton WI
Age: 39
Posts: 76,276
Thanked 2,020 Times in 1,469 Posts
fsttyms1
Points: 99,710, Level: 100
Points: 99,710, Level: 100 Points: 99,710, Level: 100 Points: 99,710, Level: 100
Activity: 68.9%
Activity: 68.9% Activity: 68.9% Activity: 68.9%
Quote:
Originally Posted by rcb2000 View Post
I vote for the TPS
But that doesnt typically cause the rpms to fluctuate though. That is usually the IACV.
fsttyms1 is offline   Reply With Quote
Old 02-05-2010, 12:34 PM   #6
Registered Member
 
Trader Rating: (0)
Join Date: Nov 2009
Posts: 386
Thanks: 0
Thanked 2 Times in 2 Posts
Points: 2,636, Level: 31
Points: 2,636, Level: 31 Points: 2,636, Level: 31 Points: 2,636, Level: 31
Activity: 0%
Activity: 0% Activity: 0% Activity: 0%
Yes the IACV is usually the issue but given he's cleaned that and it had no effect, guess I would get the multimeter out and verify the correct input voltage and that it is functioning correctly, but seems like there is too much of a swing in rpm for it to be the IACV. Can't you use a resistor to test it's functinality and rule it out or verify it's bad?
rcb2000 is offline   Reply With Quote
Old 02-06-2010, 12:45 PM   #7
Registered Member
 
nisreo's Avatar
 
Trader Rating: (0)
Join Date: Dec 2007
Location: Taunton, MA
Age: 29
Posts: 80
Thanked 3 Times in 2 Posts
Points: 4,603, Level: 43
Points: 4,603, Level: 43 Points: 4,603, Level: 43 Points: 4,603, Level: 43
Activity: 1.6%
Activity: 1.6% Activity: 1.6% Activity: 1.6%
Take your intake tube off, start the car. On the inside of the throttle body on the bottom, there is a hole. Cover about 3/4 of that hole with your finger and see if the idle smooths out. If it does, its a good sign you have a bad IAC.
__________________
Acura Certified Technician 2004-2009
2000 Acura TL
nisreo is offline   Reply With Quote
Old 02-07-2010, 12:40 AM   #8
Senior Moderator
 
fsttyms1's Avatar
 
Trader Rating: (0)
Join Date: Aug 2002
Location: Appleton WI
Age: 39
Posts: 76,276
Thanked 2,020 Times in 1,469 Posts
fsttyms1
Points: 99,710, Level: 100
Points: 99,710, Level: 100 Points: 99,710, Level: 100 Points: 99,710, Level: 100
Activity: 68.9%
Activity: 68.9% Activity: 68.9% Activity: 68.9%


Quote:
Originally Posted by rcb2000 View Post
Yes the IACV is usually the issue but given he's cleaned that and it had no effect, guess I would get the multimeter out and verify the correct input voltage and that it is functioning correctly, but seems like there is too much of a swing in rpm for it to be the IACV. Can't you use a resistor to test it's functinality and rule it out or verify it's bad?
Just because he cleaned it doesnt mean that its working correctly. First thing i would do is take some carb cleaner (in a spray can) and with the motor running is spray around the intake plumbing to see if there is a vacuum leak. If there is the idle will change.

Also there isnt too much of a swing for it to be the IACV, it can swing as much as a few thousand RPM.
fsttyms1 is offline   Reply With Quote
Old 02-07-2010, 12:48 AM   #9
Registered Member
 
AcuraTL99's Avatar
 
Trader Rating: (5)
Join Date: May 2003
Location: Diamond Bar, CA
Age: 28
Posts: 179
Thanks: 0
Thanked 0 Times in 0 Posts
Points: 9,257, Level: 64
Points: 9,257, Level: 64 Points: 9,257, Level: 64 Points: 9,257, Level: 64
Activity: 0%
Activity: 0% Activity: 0% Activity: 0%
Or a bad IACV, that happened to me last year.
Mechanic checked, cleaned, nothing, had to replace the whole IACV.
AcuraTL99 is offline   Reply With Quote
Old 02-11-2010, 7:42 PM   #10
Registered Member
 
Trader Rating: (0)
Join Date: Mar 2005
Location: Toronto
Posts: 479
Thanked 29 Times in 19 Posts
Points: 11,557, Level: 70
Points: 11,557, Level: 70 Points: 11,557, Level: 70 Points: 11,557, Level: 70
Activity: 1.4%
Activity: 1.4% Activity: 1.4% Activity: 1.4%
Hi Guys :

I swear this has happened to me twice and BOTH times it was bad gas ! This seems to happen when I drove up north and filled up in rural areas. I think it was water in the fuel and I resolved it by topping up the tank up with new/different gas.

It doesn't hurt to try it ?

smartypants
smartypants is offline   Reply With Quote
Old 02-17-2010, 10:26 PM   #11
Registered Member
 
Trader Rating: (0)
Join Date: Nov 2009
Location: Bowmanville, Ontario
Age: 42
Posts: 31
Thanks: 0
Thanked 0 Times in 0 Posts
Thanks for the advice guys, I had the same problem yesterday and I cleaned the IACV and voila, problem solved.
__________________
Believe everything you hear!
daquel is offline   Reply With Quote
Old 02-18-2010, 6:41 PM   #12
Registered Member
 
nsnrider's Avatar
 
Trader Rating: (2)
Join Date: Apr 2009
Location: chicopee, ma
Posts: 102
Thanks: 0
Thanked 10 Times in 5 Posts
Points: 3,872, Level: 39
Points: 3,872, Level: 39 Points: 3,872, Level: 39 Points: 3,872, Level: 39
Activity: 0%
Activity: 0% Activity: 0% Activity: 0%
definitely the IACV, how did you clean it, just spray cleaner in the throttle body or did you actually unbolt the IACV, sprayed the cleaner in the unit itself and verified that the shaft is turning? You might need to clean it again.

Hondas are notorious for having IACV valve stick after the engine sat for any extended period of time.
nsnrider is offline   Reply With Quote
Old 03-09-2010, 10:03 PM   #13
you know me...
 
unINSPIREd's Avatar
 
Trader Rating: (0)
Join Date: Jan 2010
Location: Lynwood, CA
Age: 28
Posts: 9
Thanks: 0
Thanked 0 Times in 0 Posts
Points: 1,178, Level: 18
Points: 1,178, Level: 18 Points: 1,178, Level: 18 Points: 1,178, Level: 18
Activity: 0%
Activity: 0% Activity: 0% Activity: 0%
this thread saved me so much trouble.
unINSPIREd is offline   Reply With Quote
Old 03-10-2010, 9:20 PM   #14
Registered Member
 
Trader Rating: (0)
Join Date: Feb 2007
Location: S.E. Wisconsin
Posts: 63
Thanks: 0
Thanked 2 Times in 2 Posts
Points: 5,779, Level: 49
Points: 5,779, Level: 49 Points: 5,779, Level: 49 Points: 5,779, Level: 49
Activity: 0%
Activity: 0% Activity: 0% Activity: 0%
It is your IACV valve, I had a same problem, Acura replaced mine under warranty and no more idle issues.
__________________
2010 Acura TSX V6
Palladium Silver - Unique

2003 Acura TL-Type S
Satin Silver - Sold
03TLS4me is offline   Reply With Quote
Old 03-12-2010, 11:31 PM   #15
you know me...
 
unINSPIREd's Avatar
 
Trader Rating: (0)
Join Date: Jan 2010
Location: Lynwood, CA
Age: 28
Posts: 9
Thanks: 0
Thanked 0 Times in 0 Posts
Points: 1,178, Level: 18
Points: 1,178, Level: 18 Points: 1,178, Level: 18 Points: 1,178, Level: 18
Activity: 0%
Activity: 0% Activity: 0% Activity: 0%
Question

I went through the process of cleaning and reinstalling the IACV and it did not work. Theres a plastic screw on the IACV and I read somewhere that this screw is to tune the idle. Does anyone know if this is true?
__________________
murdered out coming soon
unINSPIREd is offline   Reply With Quote
Old 03-13-2010, 10:27 AM   #16
Senior Moderator
 
fsttyms1's Avatar
 
Trader Rating: (0)
Join Date: Aug 2002
Location: Appleton WI
Age: 39
Posts: 76,276
Thanked 2,020 Times in 1,469 Posts
fsttyms1
Points: 99,710, Level: 100
Points: 99,710, Level: 100 Points: 99,710, Level: 100 Points: 99,710, Level: 100
Activity: 68.9%
Activity: 68.9% Activity: 68.9% Activity: 68.9%
I havent seen a plastic adjustment screw on the IACV. Dont know where you read that. If you cleaned it and it still doesnt work, its likely you need to replace it.
fsttyms1 is offline   Reply With Quote
Old 03-13-2010, 12:07 PM   #17
Registered Member
 
Trader Rating: (0)
Join Date: Aug 2008
Posts: 5
Thanks: 0
Thanked 0 Times in 0 Posts
Threadstarter
Points: 2,254, Level: 28
Points: 2,254, Level: 28 Points: 2,254, Level: 28 Points: 2,254, Level: 28
Activity: 0%
Activity: 0% Activity: 0% Activity: 0%
It was the IACV. I cleaned it once by just taking it off and spraying it down with throttle bottle cleaner and wiping it down and that didnt fix it. So I decided to take it off again and clean it good with Qtips and throttle bottle cleaner. Spent a good 20 minutes cleaning it good and that fixed the problem. I appreciate everyones advice.
whistlekleen is offline   Reply With Quote
Old 03-13-2010, 9:12 PM   #18
you know me...
 
unINSPIREd's Avatar
 
Trader Rating: (0)
Join Date: Jan 2010
Location: Lynwood, CA
Age: 28
Posts: 9
Thanks: 0
Thanked 0 Times in 0 Posts
Points: 1,178, Level: 18
Points: 1,178, Level: 18 Points: 1,178, Level: 18 Points: 1,178, Level: 18
Activity: 0%
Activity: 0% Activity: 0% Activity: 0%
Unhappy

I think its the TPS that lets you adjust the idle. I replaced the whole IACV and even ran sea foam thru the vacuum lines and fuel tank and the issue didnt go away. Throttle body was cleaned as well.
__________________
murdered out coming soon
unINSPIREd is offline   Reply With Quote
Old 03-13-2010, 9:12 PM
AcuraZine
Acura Integra




Paid Advertisement


 
 
 
submit to reddit
Reply

Tags
02, 2002, 2003, acura, car, down, idle, idling, mdx, own, reving, revs, revving, tl, tsx

Thread Tools Search this Thread
Search this Thread:

Advanced Search

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 Off
Trackbacks are On
Pingbacks are On
Refbacks are On



All times are GMT -5. The time now is 8:25 PM.



Honda and the Honda marquee are registered trademarks of the American Honda Motor Company, Inc. Neither American Honda Motor Company nor its subsidiaries or affiliates shall bear any responsibility for Acurazine.com content, comments, or advertising. Acurazine.com is not affiliated with American Honda Motor Company in any way. American Honda Motor Company does not sponsor, support, or endorse Acurazine.com in any way. Copyright/trademark/sales mark infringements are not intended or implied.
Passwords Backup