Idle Air Control

Asked by Apr 13, 2017 at 09:47 PM about the 1999 GMC Sierra 1500 SLE Extended Cab SB

Question type: Maintenance & Repair

I thought my IAC was messing up so I tried to reset
it. So I unplugged the electrical connection turned
my truck on the replugged it. Now its worse than
before. What did I do wrong? Some one help

1 Answer

69,555

Sounds like you "taught" the computer a new closed position for the IAC. Not sure if this will work, but it's worth a try. Unplug the IAC and, using a scan tool, clear the computer. Turn off the ignition then unplug the scan tool. Plug the IAC back in and then start the engine. I've never heard of this happening with the IAC but that's the procedure for resetting the EGR valve. So it may work for the IAC too. BTW an EGR valve that's sticking open can cause poor idling, stalling, and hard/no starting. HTH. -Jim

Your Answer

GMC Sierra 1500 Experts

  • #1
    dragonflyoffshore
    Reputation
    5,300
  • #2
    John Saffrahn
    Reputation
    3,670
  • #3
    Glenn Clingenpeel
    Reputation
    3,350
View All

Related Models For Sale

Used Chevrolet Silverado 1500
181 Great Deals out of 10,712 listings starting at $2,500
Used Ford F-150
447 Great Deals out of 9,147 listings starting at $3,000
Used Toyota Tundra
14 Great Deals out of 771 listings starting at $3,999
Used Dodge Ram 1500
58 Great Deals out of 529 listings starting at $2,995
Used Toyota Tacoma
33 Great Deals out of 797 listings starting at $5,995
Used GMC Yukon
14 Great Deals out of 863 listings starting at $5,950
Used Chevrolet Tahoe
5 Great Deals out of 641 listings starting at $6,871
Used Ford F-250 Super Duty
18 Great Deals out of 784 listings starting at $3,000
Used Chevrolet Camaro
785 listings starting at $12,995

Used Cars For Sale

2017 GMC Sierra 1500 For Sale
13 Great Deals out of 6,570 listings starting at $25,988
2016 GMC Sierra 1500 For Sale
29 Great Deals out of 231 listings starting at $21,988
2015 GMC Sierra 1500 For Sale
68 Great Deals out of 556 listings starting at $20,950
2014 GMC Sierra 1500 For Sale
39 Great Deals out of 513 listings starting at $16,963
2013 GMC Sierra 1500 For Sale
25 Great Deals out of 263 listings starting at $10,560

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use.