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However, the most common set code is a P0300 that stands for multiple and random misfires. Unfortunately, this problem is easily mistaken with another common 4.3 L Vortec engine issue. Ignition misfires due to distributor problems, worn cap and rotors way past their maintenance guidelines can also set these codes. Mar 17, 2007 · I have a 1995 Chevy Blazer with a 4.3 litre vortec engine. The engine only has 20k. I have replaced the fuel pump, sending unit, and the fuel filter. When the vehicle is driven up a hill it spits and sputters. After about a week of normal driving conditions or if driven a long distance in a day.

Why does my 95 S10 Blazer 4.3 vortec cpi want to shut off coming to a stop but if I keep my foot on the gas and keep it idled while stopped it doesnt? The IAC (idle air control) valve may be at fault.
This is a must have upgrade for any GM Vortec motor that incorporates SCPI injection. By performing this upgrade you will notice a smoother idle, better throttle response and all-around better performance. please click on one of the links below to purchase your New Delphi MFI Spider unit today! 1996-2007 4.3L vin [W] complete spider unit
View and Download Marine Power 4.3 VORTEC MPI owner's manual online. 4.3 VORTEC MPI engine pdf manual download. Also for: 6.0 vvt, 6.2 ls3, 6.2 lsa, 5.7 vortec mpi.
The 4.3 Vortec engines made from 1996-2002 (L35 and LF6) have been reported to have engine knock problems. In a properly functioning engine, fuel burns in even pockets instead of all at once. The pockets burn in even timing, in sync with engine cycles. Engine knock occurs when the fuel burns unevenly and out of sync with the engine cycles.
Common Problems. A common complaint with the Chevy 4.3 engine is that it doesn't idle well, it's loud and makes awkward noises. Examples of this are staling, lurching and poor acceleration. Poor idling and loud engines usually go hand-in-hand. Chevy 4.3 engine are known for making bad throttle control switches (TCS) and Idle air control valves (IAC), which would cause all these problems.
can help you isolate the problem cylinder. Once the cylinder is identified, add propane at the throttle body until the rpm peaks. Then repeat the test. If the weak cylinder now contributes, the poppet valve for that cylinder should be suspect. One caveat: The intake design of the 4.3-liter Vortec V6 can prevent the propane from being evenly dis-
down), but the 4.3 V-6 is an unbalanced engine (two pistons up/one. piston down -- two pistons down/one piston up). This V-6 imbalance is. made worse due to the massive size and huge displacement...
I have been going round and round on this truck with no final fix. I have a 1997 Chevy 1500 5.7 V8, 4L80E. For the past 8 months now it has been running poorly. It will not idle right when in drive, but in park it is better. It will loose power when at speed and when accelerating. It has had...
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  • This almost sounds like you freaked out the learned idle correction. In some cases when you clean the throttle body on the drive by wire vehicles the pcm is limited in it's calibration and can not phisicaly learn back to normal idle. So the idle learn needs to be reset and in even more involved cases the pcm needs to be reprogrammed.
  • Nov 30, 2015 · In general however, there are two problems that can cause engine idle speed to fall outside of specifications: Issues with the idle control valve (or screw on a carburetor) Vacuum leaks or obstruction of fuel/air flow into the combustion chamber
  • Apr 05, 2007 · Basically it is very bad on gas, backfires, gutless, wont idle sometimes, smell of raw fuel out the tail pipe. All sensores are good and it is not 4.3 vortec custom computer programming
  • Feb 07, 2009 · I love the 6.0 vortecs, only downside is the fuel mileage when its in a 2500 chassis. They really wake up and make a ton of power with a few mods. I'm actually looking for an LY6 (Gen IV Vortec 6.0 w/ L92/LS3 heads) to replace the 4.8 in my Sierra RCSB. With a nice mild cam this thing will easily make well over 400whp/400wtq.
  • One of the most common problems is likely a rough running or poorly idling engine. The purpose of this article is to highlight some of these common problems and how to fix them, so your mighty "Five-Oh" runs just as good, if not better than it did during the Reagan/Bush Sr. years. Published Dec 7th, 2015

Oct 15, 2004 · This page goes over my 8.1L Vortec swap I put in my 67 C10 back in 2004. I don't have much specific swap details on this page, but wiring info is similar on this engine as the 4.8/5.3/6.0 info found HERE! Update: 10/15/2004. 8100 Destruction pictures are here! I have ordered a camshaft to replace the stock piece in the 8100.

This almost sounds like you freaked out the learned idle correction. In some cases when you clean the throttle body on the drive by wire vehicles the pcm is limited in it's calibration and can not phisicaly learn back to normal idle. So the idle learn needs to be reset and in even more involved cases the pcm needs to be reprogrammed.
Oct 15, 2004 · This page goes over my 8.1L Vortec swap I put in my 67 C10 back in 2004. I don't have much specific swap details on this page, but wiring info is similar on this engine as the 4.8/5.3/6.0 info found HERE! Update: 10/15/2004. 8100 Destruction pictures are here! I have ordered a camshaft to replace the stock piece in the 8100. Oct 30, 2006 · I only have this problem when > > >sitting at idle for a couple of minutes, then it starts to drop slowly > > >then stall.Before you go too far you migh pull TBI and check think gasket between > > it on intake as they are prone to fail. Mine did a few years ago and I > > had all kinds of weird idle problems from it. > > -----

GM 6.0L Vortec L96 V-8 6.0L Vortec V-8 Specifications and Information. General Motor's 6.0L V-8, or Vortec 6000, has been the gas engine of choice in the company's heavy duty applications, including the Chevrolet Silverado and GMC Sierra 2500/3500, since the 2010 model year.

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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.