Question about 1993 Chevrolet S-10 Blazer

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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 by the waay it runs great out on the highway and around town just when sitting idle its kinda rough

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  • Dan Olson Dec 29, 2013

    Depends on which engine you have. the eight diget in the vin tell you. If you have the w engine then two possibliltys are a leaking pressure regulator or a cracked plastic line supplying fuel to the injector unit. These are both under the intake manifold plenum. when you key up the unit you will see the raw fuel leaking from one of these areas. Be carefull and do not attemp to start engine with this apart.

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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.

Posted on Dec 29, 2013

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  • 159 Answers

Check gap on plugs or choke not operating properly,or fuel filter

Posted on Dec 29, 2013

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bunnydawg
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SOURCE: rought idle

blown head gasket

Posted on Apr 25, 2009

Molson02536
  • 3854 Answers

SOURCE: 95 Chevy C-1500 runs rough at idle and during accelleration

Check the vacuum line to the fuel pressure regulator and check to see if the fuel pressure regulator has gone bad. Give the throttle body a good cleaning and the injectors too. Do not use carb cleaner, it's to corrosive for the gaskets used in the throttle body. The other thing too that would cause this is a stuck or bad EGR valve, Try cleaning the EGR valve too since your cleaning the throttle body. Good luck and keep me posted.

Posted on Jun 11, 2009

csmock132
  • 4669 Answers

SOURCE: 1987 Chevy Blazer Vortec 4.3 engine.

What is the 8th digit of the vin?

Posted on Jun 06, 2010

rfoulds85
  • 128 Answers

SOURCE: 1994 CHEV 4.3L VORTEC 1500

Going on the information you have provided it sounds to me like the fuel pressure regulator.It is located unthe intake manifold and is a lenghty job to do and is exspensive to have done.If you have a good mechanical ability it can be done by yourself in about 4-5 hours.and cost about $100 bucks.

Posted on May 04, 2011

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1993 Chevy S10 Blazer engine hesitation with smoke from exhaust


Had a 94 Olds Bravada that did a similar thing and it was EGR valve on the front of the intake. It' s easy to take off and clean with WD 40 and if you have an air compressor blow it out good.

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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?


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1999 S10 Blazer 2WD 4.3L V6. Starts hard, idles rough.


you have a single injector under the intake plenum it has 6 branching fuel leads off of this.A very common problem is the regulator attached to this and it leak off fuel which falls into the intake .causing this problem. it needs to be replaced .i have done at least 80 of these in my career.this will fix your problem.thanks for choosing fix ya

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


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.

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1993 Chevy Blazer Oil Pressure


nothing ..normal low pressure at idle while hot ...but really should be thinking fresh oil change and filter soon..also what are the RPM's at idle hot in gear with A/C radio and other accessories running?

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1 Answer

94 blazer vortec 4.3 idle revs up and dont come down


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Nov 09, 2008 | 1994 Chevrolet S-10 Blazer

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