How to troubleshoot a Chevy 4.3 engine?

1 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. 2 Idle Air Control Valve and Throttle Conrtol Switch. Open up the hood and look at all the wires, spark plugs, tubes, vacuum lines and valves. 3 Check Your Oil. 4 Vehicle Fuilds. …

Which is the most fuel efficient Chevy Trailblazer?

The Trailblazer’s fuel economy only barely exceeds that of the one-size-smaller Trax, which is fully subcompact and comes with a turbocharged 1.4-liter four-cylinder engine and theoretically should be the smallest and lightest of the bunch, and therefore the most efficient.

What kind of engine does a trailblazer have?

We figured the Trailblazer’s smaller-than-usual three-cylinder engines—four-cylinders are still typical in most new small cars, with a few exceptions such as Mini’s Hardtop—might net a fuel-economy benefit relative to its rivals. That isn’t the case.

Can a GM TBI be used for fuel injection?

TBI Fuel Injection Conversion using a GM TBI EFI system! One of the most popular EFI conversions to older Chevy engines or any engine for that matter is the GM TBI system using the 1227747 ECM. There are many others that will do the same thing but the 1227747 is most well known and documented and will be the basis for this article.

What kind of fuel injector does a 4.3L engine use?

This system used on all 4.3L, 5.0L, and 5.7L engines from 1996 to present. This ‘Spider’ assembly has either 6 or 8 individual fuel injectors that feed 6 or 8 nylon fuel lines. The CSFI system does use a MAF sensor.

Are there any problems with the Chevy 4.3 Vortec engine?

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.

What kind of fuel injector does the Spider use?

The CPI system was used only on the 4.3L V6 engines from 1992 to 1995 only. The ‘Spider’ assembly has only one fuel injector that feeds the 6 nylon fuel lines. The CPI fuel injection system does not use a MAF sensor. CSFI stands for: C entral S equential F uel I njection. This system used on all 4.3L, 5.0L, and 5.7L engines from 1996 to present.

Why are the Spider injectors leaking in the L35 engine?

The spider system uses a central pump with 6 tubes connected to it that lead to each of the 4.3L vortec cylinders. In the L35 and LF6 engines, the spider injectors are known to leak at the pressure regulator and at the supply and return lines due to a design fault.

What kind of noise does a Chevy 4.3 make?

by Contributor. 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.

Why does my GM 4.3L engine not start?

No Start Condition Basics There are three very basic components that the engine, in your GM vehicle, needs to start and they are: Air, Fuel and Spark. When your 4.3L, 5.0L or 5.7L GM vehicle cranks but does not start, it’s because one of these components is missing from the mix.

What causes a Chevy 4.3 engine to stall?

Lack of oil will cause a knocking sound in the engine, stalling, poor acceleration and eventually engine break down. Lack of transmission fluid, battery fluids, radiator and cooling system fluids can all cause symptoms that mimic bad idle air control valves and throttle control switches.

Why is my Chevy Vortec 4300 V6 leaking fuel?

In the L35 and LF6 engines, the spider injectors are known to leak at the pressure regulator and at the supply and return lines due to a design fault. Outside of leaking fuel onto the exterior of the engine itself, it can cause excess fuel to get sucked into the engine.

What does the code 86 mean on a Chevy ECM?

Count the flash codes and record them onto a sheet of paper. The check engine light will flash the codes at you, in a series of long and short pulses of light. For example, General Motor’s code 86 will appear as eight long flashes, followed six shorter flashes. There will be a dark, silent pause between coding sets.

How does the Check Engine light work on a Chevy?

The check engine light will flash the codes at you, in a series of long and short pulses of light. For example, General Motor’s code 86 will appear as eight long flashes, followed six shorter flashes.

What are the problems with a 2005 Chevy Silverado?

1 Transmission Failure 2005 Silverado Average Cost to Fix: $2,800 Average Mileage: 66,000 mi 2 Speedometer Malfunction 2005 Silverado Average Cost to Fix: $400 Average Mileage: 69,000 mi 3 Clunking Noise From Steering 2005 Silverado

What are the symptoms of a Chevy Vortec engine problem?

Symptoms of Failing Idle Control Valve and Throttle Position Sensor 1 Rough idling 2 Engine stalling 3 Hesitation during acceleration 4 Hard shifting and lack of power 5 Lack of accelerator responsiveness 6 P0122 engine code (TPS sensor)

Why is my Chevy Silverado running rough at idle?

Really, your Silverado will be running rougher at any RPM, but a misfire will be most pronounced at idle. Spark Plug Wires – While not every model and engine combination of vehicles today comes with spark plug wires (a lot are now coil on plug), if your Silverado happens to have them, they can go bad and cause a rough idle.

Where is the idle control valve on a Chevy Vortec?

The idle control valve sits on the throttle body and is responsible for adjusting the amount of air that enters the engine at idle, ultimately controlling engine idle speeds. At idle, the valve blocks a small amount of air from entering the engine, keeping idle RPM’s low.

Why does my Chevy S-10 idle so bad?

Computer does show that it is in OPEN LOOP MODE and O2 Sensor shows RICH and while working the throttle and watching the code meter, the reading will move from RICH to LEAN and back to RICH again. While all of this has helped the engine somewhat, it still barely idles and it still lops really bad.

Can a GM 4.3L Vortec engine be tested?

This isn’t possible on the GM 4.3L, 5.0L, and 5.7L Vortec engines with a ‘Spider’ fuel injector (the fuel injector is inside the intake manifold plenum and its outside electrical connector doesn’t allow for such a test).

What causes spark plugs to get wet and foul out?

According to AA1Car.com, this occurs when the spark plug fails to fire, or fouls out. This can be caused by a number of variables, such as engine flooding, or excessive moisture build up. Failed vehicle starting attempts eventually lead to wet spark plugs, according to E3 Spark Plugs.

What to do if your Chevy Express won’t start?

It sounds like it’s trying to start but won’t. The key only comes out in vans that are equipped with the V.A.S.T system. Weirdly banging on the dash sometimes works too. If it does not try to start for a second and then die, replace the cap and rotor. This video is about an issue involving the disabling of the fuel pump for security. Loading…

Where are the fuses located on a Chevy Express?

Here you will find fuse box diagrams of Chevrolet Express 2003, 2003, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018, 2019 and 2020, get information about the location of the fuse panels inside the car, and learn about the assignment of each fuse (fuse layout) and relay.

What are the symptoms of a bad transmission speed sensor?

Symptoms of a Bad or Failing Transmission Speed Sensor. 1 1. Harsh or Improper Shifting. Without a valid speed signal from these sensors, the PCM will not be able to correctly control the shifting of gears 2 2. Cruise Control Does Not Work. 3 3. Check Engine Light Comes On.

What happens when you shift your transmission hard?

When the transmission shifts hard, it can damage internal components including valve bodies, hydraulic lines, and in some cases mechanical gears. If you notice your transmission is shifting harshly or roughly, you should contact a local ASE certified mechanic as soon as possible.

Are there any issues with the Chevy Silverado’s transmission?

Issue with the second gear apply circuit, service servo assembly, or 1-2 accumulator – pressure test No Reverse in 2nd or 4th gear, 1st and 3rd only: Transmission goes into gear harshly, vehicle sluggish from start, no 1st, 4th, or torque convertor lockup, manual 2nd, 3rd, reverse gears only working, check engine light is on:

What happens if your transmission fluid is low?

If your transmission fluid is low, the transmission may not be able to shift correctly. Plus, you can see and smell the fluid to tell if it is burnt. Add fluid to the correct level if low. Figure 3. Check your transmission fluid dipstick. If fluid level is acceptable, move on to Step 5. If fluid is burnt proceed to Step 4.

Are there no reverse gears in a Chevy Silverado?

No Reverse in 2nd or 4th gear, 1st and 3rd only: Transmission goes into gear harshly, vehicle sluggish from start, no 1st, 4th, or torque convertor lockup, manual 2nd, 3rd, reverse gears only working, check engine light is on: Transmission is in Limp Home Mode or has no electrical power. Also, PCM has lots of error codes.

Why is the transmission on my Chevy Silverado not working?

Enter the vehicle and put the transmission in gear. If there is a clunking sound as you do this, the transmission mounts may have failed. Drive the Silverado for a short time.

Why does my Chevy transmission not go into 3rd gear?

Chevy transmission won’t shift, stuck in 1st gear or limp mode – Speedometer may also display zero at all times. It could be internal transmission failure, low transmission fluid, or faulty Vehicle Speed Sensor (VSS sensor). Chevy transmission won’t go into 3rd or 4th gear – This is a good indication that 3 or 4 gear clutches are worn.

How to troubleshoot a transmission problem in a Chevrolet?

1 Symptoms. The first sign that you may have a possible transmission problem could be the check engine light coming on. 2 Troubleshooting Steps. The first steps in troubleshooting the Chevrolet transmission problem are to read the fault codes from the Transmission Control Module (TCM) and check the transmission fluid level. 3 Common Problems.

What causes a grinding noise in a Chevy transmission?

Transmission grinding noise – sun shell (planetary gears) may be damaged. Chevy will drive in 1st and 3rd only but not 2nd or 4th gear – Sunshell may be damaged, or splines are sheared off, servo seals may be worked out, bands themselves could be worn out.

Is the Chevy 4.3L V6 a good engine?

While the 4.3L V6 might not be the fastest, smoothest, or the most fuel efficient engine, it is a great workhorse, Being a 350 with 2 cylinders loped off, its reliable as dirt. +1 The 4.3 will last forever if maintained. Great reliability and good torque, but only about 200 HP in best trim.

What kind of engine does a 1999 Chevy Silverado have?

1999 Chevy Silverado 5.3L Engine Motor 8cyl OEM (Fits: 1999 Chevrolet Silverado 1500)

Where can I buy a 1999 Chevy Silverado?

This Chevrolet Silverado 1500 is well equipped and includes the following key features and benefits, LOCAL TRADE!, AWD 4×4 Four Wheel, Vortec 5.3L V8 SFI, 4-Speed Automatic, 4WD, ABS brakes.1999 Chevrolet Silverado 1500 4WD Vortec 5.3L V8 SFI Indigo Blue MetallicCorwin Public Wholesale! Located at 323 8th Avenue South, Nampa, ID 83651.

What’s the towing capacity of a 1999 Chevy Silverado?

Description: Used 1999 Chevrolet Silverado 1500 LT with 6000lb Towing Capacity, Extended Cab.

Which is the best engine for a Chevy Silverado?

10% OFF $75. Use Code: DIYSAVE10 Online Ship-to-Home Orders Only Your Chevrolet Silverado engine gives you the strength and durability a pickup truck needs with a fuel efficiency that goes easy on your wallet. When your engine starts steaming or knocking, you know you have a problem that needs fixing.

How often should I Check My oil in my Chevy 4.3?

If you have an older car, you may need to check your oil every other week. Lack of oil will cause a knocking sound in the engine, stalling, poor acceleration and eventually engine break down.

Is the GM TBI 4.3L a Vortec engine?

I hope you find the information below helpful. Main Recommendation is dont touch the TBI 4.3L and if your 1994-95 4.3L has Vortec valve covers that does not make it a vortec engine. GM ran out of valve covers in 1993 and put vortec 4.3L valve covers on both engines.

What are the specs of a 1993 Chevy c1500?

The table below shows all 1993 Chevrolet C1500 specs by style, including MPG (fuel economy), transmission details, and interior and exterior dimensions. Additionally, find 1993 Chevrolet C1500 warranty and reliability information, such as limits on bumper-to-bumper coverage and major components. 34.0 gal. 25.0 gal. 25.0 gal.

What kind of engine does a 1993 Chevy Silverado have?

The gross weight of the truck is 7,200 lbs. The 1993 Silverado is a 1-ton pickup truck. It has a standard 190-horsepower 5.7-liter V-8 engine and a five-speed manual transmission. Engine options for the vehicle include a 6.2L or 6.5L V-8 diesel engine and a 7.4L V-8 gasoline engine, and a four-speed automatic transmission is available.

What is the towing capacity of a 1993 Chevy Silverado?

A four-speed automatic transmission is available as an option, as is a 5.0L or 5.7L V-8 gasoline engine and a 6.2L V-8 diesel engine. The 1993 Silverado 1500 has a maximum towing capacity of 4,500 lbs. and the maximum payload is 1,619 lbs.

How long does a Chevy 4.3L Vortec engine last?

3 vortec is a very strong and reliable motor, proven by it being the longest lasting production vortec engine. Generally, these engines are extremely capable of lasting up to 300,000 miles.

What was the misfiring code on my 1999 Chevy S-10?

First we replaced the plugs that were the wrong ones. With the computer conected we monitored the live data and were recordeing most of the misfires in cylinder 6, 4, 2 with an occational misfire on 5. We had no codes recorded in the ECM but the fuel trims were way off.

What to do if your Chevy truck misfires?

The truck will start and idle fine however as soon as you feed a little gas it starts to miss. Giving it even more gas is either covering up the misfire or it is clearing and seeems to run better. I’ve just replaced cap/rotor wires and plugs.

What should I replace on my 1998 Chevy k1500?

Here is what has been replaced to try and stop this misfire: spark plugs, spark plug wires twice, distributor cap twice, rotor, ignition coil, EGR, CTS on intake manifold, coolant temp gauge sender, fuel filter, fuel pump, MAF sensor, oil change.

How to help me with a Chevy k1500 misfire?

× Help us help you. By posting the year, make, model and engine near the beginning of your help request, followed by the symptoms (no start, high idle, misfire etc.) Along with any prevalent Diagnostic Trouble Codes, aka DTCs, other forum members will be able to help you get to a solution more quickly and easily!

Why is my Silverado 4.3 running so rough?

But it’s been running like that for years and the lean condition has been attributed to a probable lower intake manifold vacuum leak most likely. Guys on this forum have said that the 4.3’s are prone to those. I have changed all the gaskets on the UIM and throttle body.

What kind of engine does a General Motors 4.3 L have?

Engine Model: General Motors 4.3 L Powertrain Generator Models: 30–45 kW TP-6103 1/01 Service CAUTION Caution: In order to reduce the chance of personal injury and/or property damage, carefully observe the instructions that follow. The service manual of General Motors Powertrain is intended for use by professional, qualified technicians.

What kind of engine does a Chevy Vortec have?

The Chevy vortec engine line spans from small block V6’s to big block V8’s and also includes some inline 4, 5, and 6 engines used in less popular GMC brands. The term “vortec” is simply a marketing name used by Chevrolet to communicate its use of “vortex technology”.

How long has my Silverado Sierra been running?

We have had it for about 9 mos and put about 7k on it. Last week it started randomly stalling/dying, most times starting right back up. Then it died on my son and wouldn’t start. NO engines popping up. When I got to it I tried to go through the basics of troubleshooting- Turned on key to listen for fuel pump, pump came on.

What causes a Chevy Silverado to run rough?

If an oxygen sensor goes bad, it can make your Silverado run too lean (or rich). A super lean running engine will often idle rough. Fuel Injectors. The fuel injection systems job is to atomize the fuel into fine mist.

What size motor does a Chevy Silverado have?

The Chevrolet Silverado comes standard with a 4.3-liter V6 engine that produces 285 horsepower and 305 pound-feet of torque.

What are the Chevy Silverado engine options?

The turbocharged 3.0-liter Duramax diesel is also part of the Silverado and Sierra lineup, however it’s not available in work truck or lower-spec configurations. Presently, Chevrolet offers the 4.3-liter V6 and 5.3-liter AFM V8 engines on WT, Custom, and Custom Trail Boss trim levels.

What are Chevrolet engines?

The Chevrolet small-block engine is a series of V8 automobile engines used in normal production by the Chevrolet Division of General Motors between 1954 and 2003, using the same basic engine block.

How to troubleshoot a misfire ( GM 4.8L, 5.3L )?

Engine Mechanical: Misfire Troubleshooting. You can find this tutorial in Spanish here: Cómo Diagnosticar y Resolver Una Falla en Cilindro (GM 4.8L, 5.3L, 6.0L) (at: autotecnico-online.com ). The core symptom of a misfire is rough idle.

Is there cylinder 6 misfire on Chevy 4.3L?

This feature is not available right now. Please try again later. Chevy 4.3L OBD-II code P0306 is generic cylinder 6 misfire detected. In this video we take apart the engine in order to solve this nasty and annoying also very common issue on GM 4.3L engines. SUBSCRIBE ON YOUTUBE! LET’S CONNECT! Loading…

What is the OBD code for Chevy 4.3L Vortec?

Chevy 4.3L OBD-II code P0306 is generic cylinder 6 misfire detected. In this video we take apart the engine in order to solve this nasty and annoying also very common issue on GM 4.3L engines. SUBSCRIBE ON YOUTUBE! LET’S CONNECT! Loading…

Are there any problems with the Chevy Silverado?

If this sensor or switch fails, the vehicle will display the service 4WD message. This faulty 4WD issue is among the most common problems with the 2008 Chevy Silverado, according to reports from owners.

What was the problem with my GMC pickup truck?

Specifically, the lawsuit claimed the active fuel management (AFM) system, piston rings and PVC system in these vehicles were faulty and caused excessive oil consumption, as well as premature spark plug degradation and engine malfunction.

What’s the problem with the Chevy LT1 V8?

This engine featured a new distributor design called Optispark that was plagued with issues. If you own an LT1 car, here’s what to watch for and what to do when that Opti fails. Source | Rich Niewiroski Jr. The original small-block Chevy (SBC) V8 was built for decades, spanning from the mid-1950s through the 1990s.

What causes a car to swerve to one side while braking?

If your vehicle swerves to one side while braking, look at one of these possible causes: Possible Cause #1: Uneven tire pressure. Possible Cause #2: Vehicle out of alignment, typically uneven caster or camber. Possible Cause #3: Brakes grabbing. …

When did the Chevy small block V8 end?

The original small-block Chevy (SBC) V8 was built for decades, spanning from the mid-1950s through the 1990s. But changing times demand changing designs. Increasing efficiency, horsepower, and emissions reduction was the name of the game in the late 1980s and early 1990s, and the camshaft-driven HEI distributor on the SBC was no longer effective.

What causes a car to have excessive kickback?

Although some kickback are normal and unavoidable, excessive kickback can be caused by: 1 Possible Cause 2 1: Low or uneven tire pressure. 3 Possible Cause 4 2: Sagging springs. 5 Possible Cause 6 3: Defective shocks. 7 Possible Cause 8 4: Looseness in steering gear or linkage. More

What happens when the EGR valve gets stuck on a GM 4.3L?

This tutorial addresses a very common problem I’ve seen on the 1987-1995 GM 4.3L, 5.0L, and 5.7L engines with throttle body fuel injection system: a stuck open EGR valve. And when the EGR valve gets stuck open, it’ll cause a rough idle condition that may hard to diagnose.

Why is my Chevy 4.3 engine still running?

Checking your vehicle’s fluid levels is always a good idea to maintain the overall longevity of the engine. Once you have ruled out all the basics, you can go back to what the Chevy 4.3 engine is known for: bad idle air control valves and throttle control switches.

What causes engine knock on a 4.3L Vortec?

Engine knock can be caused by a ton of factors, such as low-grade fuel, bad spark plugs, carbon build-up, etc. Engine knock is terrible for your engines internals and can cause serious damage to the pistons and to the cylinder walls. On the 4.3L vortec, the cause of the engine knock has not necessarily been figured out, still to this day.

Can you swap a 4.3 Chevy for a 5.7?

I have a 1989 4.3 Chevy Scottsdale and I want to swap a 5.7 out of a complete 1990 Silverado . What do I need from the 5.7 engine & body to do this well deserved swap into my 89 Scotty

Is the 4.3 L V6 engine interchangable?

I believe that the 4.3L V6 block and heads from 1988 to 1995 are fully interchangable. In other words, a 4.3 L Engine from a 1995 will bolt in perfectly into blazers of earlier years that also were equipt with a 4.3 L engine.

I have a 1989 4.3 Chevy Scottsdale and I want to swap a 5.7 out of a complete 1990 Silverado . What do I need from the 5.7 engine & body to do this well deserved swap into my 89 Scotty

When did the 4.3 L V6 come out?

The 4.3L V6 engine was introduced in the S10, S15, & S10 Blazer in 1988. I believe that the 4.3L V6 block and heads from 1988 to 1995 are fully interchangable. In other words, a 4.3 L Engine from a 1995 will bolt in perfectly into blazers of earlier years that also were equipt with a 4.3 L engine.

How to troubleshoot a 1991 Chevy 700R4 transmission?

Drive the vehicle and listen to the revving of the engine. If you have a high revving sound when you change gears from “Park” to “Drive,” as you push down on the gas pedal to accelerate, or if you feel the transmission lag on changing gears, you could have internal transmission problems.

How to troubleshoot a Chevy 4.3 engine?