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My 95 4.3 vortec blazer wont idle after its warmed up

My 95 4.3 vortec blazer runs mint for the first 5 mins then when i pull up to a red light my truck idle it just stalls and doesnt wanna run after that

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  • 33 Answers

IAC(Idle air control) and or TPS(throttle position sensor)

Posted on Jul 21, 2009

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03 chevy s10 4.3 vortec. runs fine until warmed up. then loses power. fuel pressure reads 53 at idle and 60 reved up. dropped exhaust and does the same thing, so think that rules out the cat. s


The older model vortec engines needed more fuel pressure than 60psi to run. You might want to verify the min amount for your model. Have you replaced the fuel filter recently ? Is the check engine light coming on ?

Aug 16, 2012 | Chevrolet S 10 Cars & Trucks

1 Answer

My wife's 95 blazer with the 4.3 vortec is having


I can be problem with IAC valve or motor,or there can be vacuum leak issue it its dirty Idle control valve or problem with dirt build up in throttle body.Click this link below and follow step by step troubleshooting:-----http://whatisbyme.blogspot.in/2012/05/high-idle-on-chevy-blazer.html
---------------this should help.Thanks.

May 15, 2012 | 1995 Chevrolet Blazer

2 Answers

Falls on Its face 3-5 min of driving


check the vacuum lines on the engine.sometimes these will crack or develop a small hole or break and it will **** too much air in the engine causing it to act that way.

Jan 15, 2010 | 1995 Chevrolet Blazer

1 Answer

1993 S-10 Blazer has erratic idle and stalls


Check the tps "trottle positioning sensor, on mine the idle would not stay steady, and shift so hard that it would sound like it was going to break something. it is located on the drivers side of the throttle body with a push in electrical connector.

Dec 06, 2009 | 1993 Chevrolet S-10 Blazer

1 Answer

Ok i have a blazer 95 4.3 vortec mi chk engin


Get the codes pulled, often an oil change place has all of the adapters. You need to know what the computer thinks is wrong, before you do anything.

Sep 25, 2009 | 1995 Chevrolet 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

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?

Nov 10, 2008 | 1993 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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