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Slow run down to idle 2.8 '93 s-10


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litewerx
New User

Mar 4, 2012, 8:18 PM

Post #1 of 5 (1820 views)
Slow run down to idle 2.8 '93 s-10 Sign In

My truck has a problem with the idle after it warms up. '93 Chevy S-10, 2.8. I read in an earlier post to check the IAC. Cleaned, then replaced it. It's better but it still takes 15-30 seconds for it to idle down(if it does) when getting to a stop light or stuck in traffic. I have sprayed around the engine with carb cleaner to check for vacuum leaks but found nothing. My mileage has gone from around 17mpg to 10 and @ 4.50 a gallon, it's killing me. Other recent work done was replaced "O"ring on distributor and new valve cover gaskets. It runs well, passed emissions last week but still at a loss. Any help would be greatly appreciated. Thanks.


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Mar 4, 2012, 8:21 PM

Post #2 of 5 (1818 views)
Re: Slow run down to idle 2.8 '93 s-10 Sign In

It's not just the IAC that you needed to clean. It was the entire throttle body, especially both sides of the throttle plate.



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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



litewerx
New User

Mar 4, 2012, 8:31 PM

Post #3 of 5 (1804 views)
Re: Slow run down to idle 2.8 '93 s-10 Sign In

Thank you. I didn't see that in what I read before. I will give that a try.


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Mar 4, 2012, 8:33 PM

Post #4 of 5 (1801 views)
Re: Slow run down to idle 2.8 '93 s-10 Sign In

 Remove the intake snorkel, have someone hold the throttle wide open for you and scrub the back side of the throttle plate and surrounding bore with an old tooth brush and some carb cleaner. Be sure to spray some into the small holes next to the throttle plate.



~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



litewerx
New User

Mar 4, 2012, 8:39 PM

Post #5 of 5 (1782 views)
Re: Slow run down to idle 2.8 '93 s-10 Sign In

That sounds pretty do-able. Thanks again. I'll let you know how it turns out.






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