SPONSORED LINKS

Possible IAC valve replacement?

Tiny
TEX
  • MEMBER
  • 2001 HYUNDAI ELANTRA
  • 120,000 MILES
Engine revving high. When I disconnect the IAC valve, engine stops idling high but it is still rough. When I put the IAC back, it revs up high again. Already checked for vacuum leaks and didn't find any. It wasn't sticking, but I cleaned it anyways. I had 1 TPS code - P0121. I also checked the value and everything is in spec on TPS. Checked throttle.
How do I bench test the IAC valve? Could this be the problem? How would I check the values between the terminals on the IAC?
SPONSORED LINKS
Friday, June 22nd, 2012 AT 2:02 AM

7 Replies

Tiny
SATURNTECH9
  • MECHANIC
  • 30,870 POSTS
So when you cleaned the iac did you remove it?Also does the tps code come right back when you clear it?
Was this
answer
helpful?
Yes
No
Friday, June 22nd, 2012 AT 6:01 AM
Tiny
TEX
  • MEMBER
  • 6 POSTS
I did the bench test on tps. All the values are in spec. Didn't clear the code as yet.
SPONSORED LINKS
Was this
answer
helpful?
Yes
No
Friday, June 22nd, 2012 AT 10:56 PM
Tiny
SATURNTECH9
  • MECHANIC
  • 30,870 POSTS
Please clear the code and see if it comes right back?
Was this
answer
helpful?
Yes
No
Saturday, June 23rd, 2012 AT 3:32 AM
Tiny
TEX
  • MEMBER
  • 6 POSTS
Code came back. So I got a hold of a new IAC and checked the values with mine. The values are the same, which leads me to believe that the IAC is ok. I now feel that it may be the map sensor. How would I go about checking that? Thanks.
Was this
answer
helpful?
Yes
No
Saturday, June 23rd, 2012 AT 4:42 PM
Tiny
SATURNTECH9
  • MECHANIC
  • 30,870 POSTS
We need to find out why it keeps setting the tps code thats where I would start. Follow the directions I posted and let me know what you find.
Images (Click to make bigger)
Thumb
Thumb
SPONSORED LINKS
Was this
answer
helpful?
Yes
No
Sunday, June 24th, 2012 AT 3:57 AM
Tiny
TEX
  • MEMBER
  • 6 POSTS
Thanks for your help. So it turned out to be an intermittent vacuum leak between the 3rd and 4th cylinder gasket. The gasket was broken and stuck. Map sensor needed replacing too because it had a high value resistance between the map sensor terminals (15 k-ohms) when a new one only had 3.0 ohms. Because of the faulty MAP sensor, I couldn't check for the vacuum leak properly. So I hope this helps anyone out there who may have same the problem I had. My care is working GREAT now, even better than before. Thanks again.
Was this
answer
helpful?
Yes
No
Monday, June 25th, 2012 AT 8:58 PM
Tiny
SATURNTECH9
  • MECHANIC
  • 30,870 POSTS
Your welcome glad to hear you got it fixed.
Was this
answer
helpful?
Yes
No
Monday, June 25th, 2012 AT 9:02 PM

Please login or register to post a reply.

Related Idle Air Control Replace/Remove Content

Idle Air Control Motor Replacement
GUIDE
Idle Air Control Motor Replacement
The idle air control motor or idle speed control motor is designed to adjust the air flow into the intake manifold at engine idle. Engine idle speed is monitored by the PCM...
VIEW MORE

Sponsored links