Fast idle 1999 Toyota Tacoma

Tiny
MABER144
  • MEMBER
  • 1999 TOYOTA TACOMA
  • 187,000 MILES
Replaced ICV and computer. All other components seem to be ok.
Idles about 1000-1100 RPM in drive. In neutral from 1400-1700 RPM.
V6 3400 duel cam automatic.
Do you
have the same problem?
Yes
No
Friday, December 9th, 2011 AT 11:59 PM

15 Replies

Tiny
JACOBANDNICKOLAS
  • EXPERT
Have you checked for vacuum leaks? Are all electrical connections in good condition, not corroded, and tight to the IAC?
Was this
answer
helpful?
Yes
No
Saturday, December 10th, 2011 AT 12:03 AM
Tiny
MABER144
  • MEMBER
Will check again and get back but haven't heard or seen aything strange. Thanks. Will get back to you
Was this
answer
helpful?
Yes
No
Saturday, December 10th, 2011 AT 12:07 AM
Tiny
JACOBANDNICKOLAS
  • EXPERT
Check for vac leaks too.
Was this
answer
helpful?
Yes
No
+1
Saturday, December 10th, 2011 AT 12:08 AM
Tiny
MABER144
  • MEMBER
Where is the best place to hook up a vacuum
Was this
answer
helpful?
Yes
No
Saturday, December 10th, 2011 AT 12:28 AM
Tiny
JACOBANDNICKOLAS
  • EXPERT
You can put a vacuum gauge on any intake ports.
Was this
answer
helpful?
Yes
No
+1
Saturday, December 10th, 2011 AT 12:31 AM
Tiny
MABER144
  • MEMBER
Thanks.
Was this
answer
helpful?
Yes
No
Saturday, December 10th, 2011 AT 12:38 AM
Tiny
MABER144
  • MEMBER
Vacuum steady at 21 inches engine at temp. Idle in park 1500RPM in drive 1000rpm.
Was this
answer
helpful?
Yes
No
+1
Saturday, December 10th, 2011 AT 12:50 AM
Tiny
JACOBANDNICKOLAS
  • EXPERT
That sounds good. You need to recheck the IAC connection and wiring.
Was this
answer
helpful?
Yes
No
Saturday, December 10th, 2011 AT 3:19 AM
Tiny
MABER144
  • MEMBER
Okay I will. Idle cold with IAC hooked up 1300 park 800 in drive. No diff when upluging IAC.
Normal temp IAC hooked up 1500. Disconnected 900 idle 750 in drive.
Was this
answer
helpful?
Yes
No
Saturday, December 10th, 2011 AT 3:59 AM
Tiny
JACOBANDNICKOLAS
  • EXPERT
Remove the IAC and make sure the pintal at the end moves when the key is turned on and off. IF it doesn't, check for power to it.
Was this
answer
helpful?
Yes
No
Saturday, December 10th, 2011 AT 5:58 AM
Tiny
MABER144
  • MEMBER
I will have to do this in the am. The truck is back outside. I thank you for all your help and will be in touch tomorrow.
Was this
answer
helpful?
Yes
No
Saturday, December 10th, 2011 AT 6:02 AM
Tiny
JACOBANDNICKOLAS
  • EXPERT
I'm glad to help. I just hope I can get you pointed in the right direction.

Take care,
Joe
Was this
answer
helpful?
Yes
No
Saturday, December 10th, 2011 AT 6:06 AM
Tiny
MABER144
  • MEMBER
Sorry I didn't get back but just a few questions.
1. Does the IAC get a signal from a temp sensor and if so how and where is it.
2. How do you check to see if one wire is keeping the IAC in high idle mode.
3. The temp gauge on the instrument panel works fine with great heat.
Thanks, Dave
Was this
answer
helpful?
Yes
No
Sunday, December 11th, 2011 AT 6:35 PM
Tiny
JACOBANDNICKOLAS
  • EXPERT
No to the temp sensor. The IAC receives signal from the PCM. Remove it to see if it is moving while a helper turns the key on and off.
Was this
answer
helpful?
Yes
No
Sunday, December 11th, 2011 AT 11:06 PM
Tiny
MABER144
  • MEMBER
The flapper, as I call it, with key on has resistance, with key off moves freely. The valve is cold but doesn't open with power to it. Just resistance. I get the same results with two different computers with the same number, Toyota ECM 89661-4460.
Was this
answer
helpful?
Yes
No
Tuesday, December 13th, 2011 AT 2:51 AM

Please login or register to post a reply.

Recommended Guides