Question about 1989 Chevrolet S-10 Blazer

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S10 idles too fast - 1989 Chevrolet S-10 Blazer

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SOURCE: 1991 S10 2.5L throttle body idles to fast

A vehicle that old will suffer from brittle and cracked vacuum lines. I would say there is a bad, or several bad lines leaking away vacuum from the intake manifold. Don't forget to check the hose going to the PCV on the valve cover. A vacuum leak will also cause the engine to stumble and miss intermittently when idling.

Posted on Jun 26, 2009

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2 Answers

Why is my 1994 s10 blazer idling very fast and doesn't seem to want to downshift?


First off is the check engine light on? There could be a few reasons for the fast idle. Vaccuum leak, Idle air control valve are a couple right off the top of my head. With the engine idling (as best as it will anyway) try spraying some carburetor cleaner around the base of the throttle body, any vaccuum lines connected to the manifold, and where the upper and lower intakes bolt together.

Jun 14, 2014 | 1994 Chevrolet S-10 Blazer

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My Chevy S10 2.8 idles fast in cold weather. What can I do?


Sounds like the fast idle screw needs to be adjusted on the throttle body or if it has an IAC, it may need to be replaced. A little more info on the vehicle might help to narrow it down.

Dec 12, 2012 | Cars & Trucks

2 Answers

Idle speed is to fast


They probably had your air filter out, 1st check the intake tube & vacume lines on the air cleaner box & intake tube. Make sure the clamps are tight & all vacume lines are on

Oct 15, 2012 | Daihatsu Sirion Cars & Trucks

1 Answer

My 93 s10 idols to fast when first started


With more air entering the engine [defective vacuum lines] to keep the fuel mixture correct ,,,,,fuel is increased causing the high idle.---------- Check the vacuum line and idle air control valve on throttle body checked.------------- Click this link below for car troubleshooting problems:--- http://schematicsdiagram.blogspot.com/2011/06/car-troubleshooting-guide.html ---------- Thanks.

Jun 27, 2011 | Chevrolet Chevy Cars & Trucks

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91 chev s10 V6 2.8L Very fast idle on startup , slows down a little after long warm up but not much. is their an adjustment that can be made


The solution is most likely the IAC(idle air control valve) or possibly the throttle position sensor. Both are electrical switches mounted on TBI(throttle body injection) unit. If you have a Autozone close by, they will test these for you for free.

Nov 01, 2010 | 1991 Chevrolet S-10

1 Answer

1991 S10 2.5L throttle body idles to fast


A vehicle that old will suffer from brittle and cracked vacuum lines. I would say there is a bad, or several bad lines leaking away vacuum from the intake manifold. Don't forget to check the hose going to the PCV on the valve cover. A vacuum leak will also cause the engine to stumble and miss intermittently when idling.

Jun 26, 2009 | 1991 Chevrolet S-10

1 Answer

Why is my 1994 Chevy S10 Blazer lugging? motor shakes and lugs.


Could be vacuum leak or bad ignition wire(s).

I had a similar problem on my "93 Ford probe. The engine idled pretty rough with shakes, Turned out to be a head gasket leaking engine coolant into the cylinder during low rpm's. At fast rpm's it was fine becuase the internal cylinder pressure was greater than the hot coolant pressure & would prevent the coolant from leaking in.

A friend has the same problem with his "94 Blazer 4.3 L, throttle body injection, manual tranny. He hasn't fixed it yet, It started a few weeks ago & is getting worse. His gets a fast idle with hiccups which causes the engine shake. He already checked the EGR valve. He also has a severe exhaust problem, Not oilly but very gray & terrible smelly, but only when the fast idle problem happens. THis fast idle hiccup problem starts when the engine is warmed up.

Nov 19, 2008 | 1994 Chevrolet S-10 Blazer

1 Answer

Idles to fast


Sounds like a vaccum leak at the throttle body or the intake. check for loose lines hissing with the motor running. Had a brake booster line come loose on my 92 and it ran at about 3000 rpms.

Oct 16, 2008 | 1985 Chevrolet Cavalier

2 Answers

Idles to fast


When I crank my truck it runs wide open for a minute of so and then it starts to idle down. What causes this? It is a 1992 Chevy S10 v6 pickup. How can I fix this problem? I have no manuel on this vehicle for a diagram of the engine at all.

Thank you. Dave

Oct 16, 2008 | 1992 Chevrolet S-10

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