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Why does my 1994 blazer 4.3 vortec idle rough

Had a major tune up so thats not it..also the exhaust smells bad too

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Cat converter plugged?

Posted on Apr 20, 2013

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SOURCE: strong gas smell and idles rough. did tune up. no

look at the fuel lines and injectors for signs of leakage.

Posted on Feb 14, 2010

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4 Answers

What would cause 93 chevy c1500 rough idle smells of excess gas at exhaust


Does the truck seem fine when you first start it & then acts up when it reaches operating temp?
That would lead me to look at my oxygen sensor, a bad sensor can cause the truck to run "rich" which would explain the fuel smell in the exhaust.

Jun 28, 2014 | 1993 Chevrolet K1500

2 Answers

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...


two things pop to mind with this truck, first these motors are notorious for having bad intake gaskets take a flashlight and look very carefully around the valley of your intake/block-head seal you'll possibly see either antifreeze leaking or a weird looking whitish or greenish sort of foam you can also use propane around the seal and look for obvious idle changes, I have done tons of these intakes in my shop, the other two things I would suspect if that looks fine are 02 sensors, or maf sensor.

Dec 29, 2013 | 1993 Chevrolet S-10 Blazer

3 Answers

Strong gas smell and idles rough. did tune up. no


look at the fuel lines and injectors for signs of leakage.

Feb 14, 2010 | 1997 Chevrolet K1500

1 Answer

I have a 1994 chevy blazer 4.3 vortec it is displaying fault codes 32,35,45,82 can you tell me what thay mean?


32 is baro sensor or egr valve/35 isi.a.c idle air control/45 is rich exhaust probably faulty O2 sensor in exhaust pipe/82 isign fault or ecm module or transmission solenoid(open or short circuit condition)

Oct 02, 2009 | 1994 Chevrolet S-10 Blazer

3 Answers

I have a 1994 with vortec 4.3 that shakes sometimes


Shakes how? While stopping? Or solely while idle, Engine light on?

If if shakes while stopping you need to check you're wheel hubs and or Suspension ,

Shakes at a light, You may have a bad fuel Injector, Check you're psi in you're fuel pump, A TPS would cause low idle or sometimes high idle, With low idle and a bad motor mount it would shake,

I know theres a few things I'm missing but,.. I have a major Headache atm so I'll get back to you with some more, when i can think better. :)

Sep 08, 2009 | 1994 Chevrolet S-10 Blazer

1 Answer

Rough idling sluggish acceleration


These 4.3L W motors are common for fuel leaking inside the plenum causing them to run rough and smell like raw fuel. The fuel pressure regulator leaks internally, also the injector spider leaks and the two fuel lines feeding the fuel to the spider. You have to remove the plenum and look for the clean spot. Where the fuel leaks it cleans the oil off. Before you try this check your EGR valve. The EGR valves on these get stuck open with carbon and cause a rough idle. Remove it and look for the plunger it is a small round piece that you can push in and out, make sure it closes fully. You can also clean it with carb clean and they make a replacement gasket with a screen in it to keep chunks out of it. Start with the EGR because it is easier. The parts for under the plenum are available at most any parts store. If you have any problems just ask, and if you can not find the parts I will give you part numbers. Let me know what you find I will be back tomorrow.

Jan 07, 2009 | 1994 Chevrolet S-10 Blazer

1 Answer

Idle problems


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

Nov 29, 2008 | 1994 Chevrolet S-10 Blazer

1 Answer

94 blazer vortec 4.3 idle revs up and dont come down


check your Throttle Positioning sensor that should fix your rough idle the TPS controls the breather on the front of the engine its affixed to the right hand side of the throttle body just infront of the spyder on the V6 Vortec 4.3L Models

Nov 09, 2008 | 1994 Chevrolet S-10 Blazer

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