Question about 1999 Chevrolet Blazer

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Hard start, rough idle, some black smoke, engine service light on

1999 S10 Blazer 2WD 4.3L V6. Car starts hard then idles rough. Some black smoke from exhaust. At speed the car runs fine though it may run rough at a traffic light. The air filter is clean. I removed the air induction tube from the throttle body to get a look inside. I opened the throttle plate and noticed that it was wet on the back side. To my way of thinking this indicates an abundance of fuel at low engine speed. I don't know how this fuel injection system works other than it is the throttle-body type. Any suggestions besides shoving it off a cliff, which would be difficult here as it's quite flat?

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  • Anonymous Mar 14, 2009

    really rough idle at idle then when i rev it up it seems to go away for the most part i thought it might be the cap and rotor so i changed that along with plugs and wires ,,still the idle prob is there .........? these probs can cost a barrel of cash if i let them so any help would be a welcome sight !!!!!!!!

  • Uriel Tello
    Uriel Tello May 11, 2010

    CHECK FOR ANY DIAGNOSTIC CODES. WRITE BACK it sound like your having the open loop mode operation in your engine, it could be a coolant temperature sensor.

  • heriberto muniz Jul 24, 2012

    check fo codes and also inspect e.g.r. valve stock open with carbon deposits replce valve or cleaned

  • Anonymous Mar 13, 2014

    drawing to much vacume through throttle body. running very rough. dies if I take off air box.

  • Anonymous Mar 17, 2014

    i suspect the problem is fuel related. i cleaned the throttle body, but prblem presist.

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  • Chevrolet Master
  • 6,674 Answers

A scan for trouble codes may point you in the right direction quickly, rather than hit & miss, with replacing parts. Some of the autoparts stores will scan for free, and your right where you need to be to get the right part at the same time.

Posted on Mar 04, 2009

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I would start by changing the fuel filter. Run some injector cleaner through it. And check for more of those rotten lines. You can check by spraying a little starting fluid around the vacuum lines. Be careful though. Its flammable. But the engine should speed up if you have a leak.

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I have a 1993 chevy s-10 blazer 2wd with a 4.3. vortec and it sometimes idles rough and when it does black smoke comes out of th exhaust i have changed the plugs wires rotor button and distirbutor cap and...


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Will not idle when cold


Its cold start issues:----
Go through the list of help links mentioned below:----

Click the link :----

Cold start problem and vehicle shudder around 2500 to 3500 rpms
http://repairhelpcenter.blogspot.com/2012/10/cold-start-problem-and-vehicle-shudder.html
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Low idle when cold out side?
http://repairhelpcenter.blogspot.com/2011/12/low-idle-when-cold-out-side.html
--------------
Ford explorer 4.0 will not idle when cold?
http://technoanswers.blogspot.in/2012/02/ford-explorer-40-will-not-idle-when.html
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Automatic transmission shift lever hard to move on cold mornings?
http://technoanswers.blogspot.com/2012/01/automatic-transmission-shift-lever-hard.html
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Car won't start when cold?
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It can be issue with IAC( idle air control valve) causing the problem.


There are many other possibilities causing these idle issues. Engine idles rough.

There are few help links with solutions to troubleshoot such idle issues.

I suggest you refer the link below and follow its troubleshooting details:------

Click the link below:-----

Ford Expedition IAC valve replacing

http://technoanswers.blogspot.com/2012/12/ford-expedition-iac-valve-replacing.html

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http://technoanswers.blogspot.com/2012/01/bad-miss-at-idle.html

-----------

Stumbling and stalling at idle after engine rebuild?

http://schematicsdiagram.blogspot.in/2012/03/stumbling-and-stalling-at-idle-after.html

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http://technoanswers.blogspot.in/2012/01/1999-ford-f-150-idles-rough-and-quits.html

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Engine stumbles coming off idle when warm?

http://repairhelpcenter.blogspot.com/2012/01/engine-stumbles-coming-off-idle-when.html

------------------

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http://schematicsdiagram.blogspot.com/2011/12/erratic-idle-on-car.html

-----------


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http://repairhelpcenter.blogspot.com/2012/10/cold-start-problem-and-vehicle-shudder.html

----------

Low idle when cold out side?

http://repairhelpcenter.blogspot.com/2011/12/low-idle-when-cold-out-side.html

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GMC Idle Air Control (IAC) Valve Replacing?

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http://schematicsdiagram.blogspot.com/2012/01/while-stop-engine-idles-like-cylinder.html

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These details will help.

Thanks.

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