• Jan 07, 2017 · Hello everybody. I am having an idling problem on my 97 K1500 Suburban that I can't figure out. It's a Vortec 5.7. It idles at about 1000 when I'm in park and when I'm driving it will accelerate on it's own and rev higher than it should without applying any throttle.
  • Jun 28, 2019 · Re: My 4.3 vortec 84 FB « Reply #319 on: July 03, 2019, 01:05:16 PM » Oil must be getting into the intake, Idk how you could get so unlucky with the valve seals.
  • The 4.3L V6 Vortec LU3 is an engine produced by General Motors for use in full-size light-duty pickup truck and vans. Displacing 4.3 liters in a V6 configuration, the LU3 served as the standard ...
  • Hey Gang, I just purchased a 1995 S10 Blazer with the Vortec 4.3 V6 the other day. I got it running very poorly back fireing thrugh the exsaust lightly (poping), etc. After reading around the internet I figured it was the Spider (CPI injector). So I took off the upper intake, and found that the Nut kit (the fuel lines running into the injectoer), were leaking badly and dumping fuel into the ...
  • Jan 26, 2005 · Ive been battling a problem recently with my 4.3l vortec v6. I would hesitate while running kind of like a half second about every 10 seconds, take off was pitiful and as far a jumping into the passing gear to haul butt you could forget that. Well I broke down and took it to a mechanic shop yeste...
  • Hey Gang, I just purchased a 1995 S10 Blazer with the Vortec 4.3 V6 the other day. I got it running very poorly back fireing thrugh the exsaust lightly (poping), etc. After reading around the internet I figured it was the Spider (CPI injector). So I took off the upper intake, and found that the Nut kit (the fuel lines running into the injectoer), were leaking badly and dumping fuel into the ...
  • Hi Guys, I've got a problem with my truck (1997 F-150 4.2L V6 Long Bed) and I can't find a good mechanic to help, maybe you guys can. Last summer one day my truck wouldn't start, and then when it did the check engine light was on and it ran a bit rough especially at stop lights where it would rough idle and the engine would rev up and down, on the hwy it runs fine.
  • Jun 25, 2012 · Hey guys, just did the spider upgrade on my 97 5.7L Vortec Silverado to the MPFI and giving some input if anyone else was considering this swap. Firstly, my reasons for doing this: I just put a new crate engine in it last summer and Im trying to keep everything in good condition to make this truc...

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Aug 19, 2012 · I have a '95 Vortech 4.3 in my '37 Terraplane. I used an Edelbrock manifold and 500CFM carb. I also bought an aftermarket HEI distributor, it runs great.[/QUOTE I did the same on my vortec 4.3, except I used the distributor that came in the engine. I used the pickup in the stock dist pickup as a trigger for a MSD 6a box, ran good.
Chevrolet S10 Blazer Hard To Turn over and Start, Rough Idle, Poor mileage, 4.3 vortec, Strong Fuel odor - 2 reports. Learn about this problem, why it occurs, and how to fix it.

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Bad idle on my 1995 GMC Jimmy. 4.3 Vortec CPI 4x4. 163k miles. When I turn the truck over, fires right up, and then goes into a sick idle cycle. The idle throttles from 500RPM to about 1500RPM and repeats the cycle. It sometimes stalls at the bottom, but fires right back up. It also eases up quite a bit once the truck is warm.
I have a 96 Blazer with the 4.3 vortec. When you start the car, it revs up to a really high rpm and stays there. As soon as you tap on the gas, it bogs down and dies. Let me know if you have any ideas.

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If you are getting a code 34 you should look for a collapsed or blocked vacuum line going to the MAP sensor or electrical problem between the ECM and sensor. Normal output voltage of a MAP sensor should be about 4.5 volts or so with key on, engine off; and less than 1.5 volts with engine running at idle.
Bad idle on my 1995 GMC Jimmy. 4.3 Vortec CPI 4x4. 163k miles. When I turn the truck over, fires right up, and then goes into a sick idle cycle. The idle throttles from 500RPM to about 1500RPM and repeats the cycle. It sometimes stalls at the bottom, but fires right back up. It also eases up quite a bit once the truck is warm.