Question about 1994 Chevrolet S-10 Blazer

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Idle problems i have a 94 blazer that idles rough but when i drive it it then straigthens up can u help me with this

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  • Anonymous Dec 01, 2008

    I had the same problem. It only did it once in a while. Then the service engine light came on and then off a few times. Thanksgiving I went to drive my daughter home and it wouldn't start. My husband did something to it and then it started but you have to keep your foot on the accelerator until it idles ok. I wont drive it now, I don't want to get stuck on the side of the road.

  • Anonymous Mar 14, 2009

    mine does the same thing , it,s a 94 4.3 vortec idles is up and down and it sounds like its a misfire but i have replaced the cap rotor plugs and wires so iam at a loss here ...elec is not for me lol it may just burn to the ground if no helps comes soon .........dave......just kiddin i love my blazer but i almost had it with it

  • Anonymous Mar 19, 2014

    runs rough only at idle

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  • 124 Answers

If it is a vortec 4.3l they were real common for egr valve problems. you can remove the egr check for carbon stuck in the plunger. after cleaning reinstall with a new gasket. New gaskets with a screen are available to keep this problem from happening again the standard part number is VG57. When carbon gets stuck in the egr valve it causes a vaccum leak and rough idle. please rate this if it helps

Posted on Dec 04, 2008

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Idle problems


location of egr valve and is it available? check the link below.
http://www.autozone.com/addVehicleId,1938801/initialAction,repairGuide/shopping/repairGuide.htm?pageId=0900c1528008f04e
ps dont forget to rate my solution please. Thanks.

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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.

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Nov 09, 2008 | 1994 Chevrolet S-10 Blazer

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