Chevy 350 Throttle Body Problems & Fixes

If you own a Chevrolet vehicle with a 350 engine and you are wondering why your car wont accelerate or you are having other throttle related issues, then this article on the top 5 Chevy 350 Throttle Body Problems is the ultimate guide for fixing them.

Here we take a look at how to fix your Chevy 350 Throttle Body Problems.

Top 5 Chevy 350 Throttle Body Problems

Chevy 350 Throttle Body Problems

This are the Top 5 Chevy 350 Throttle Body Problems and their fixes:

1. Excessive Release Of Emissions

Chevy 350 throttle body problems lead to an increase in the release of harmful gases from the vehicle. This problem occurs as a result of the engine running rich (too much air in the air-fuel ratio). This problem is not only detrimental to the vehicle, but also to the environment.

Fix:

To reduce the emissions from your vehicle, clean the throttle body. This is necessary, as most Chevy 350 throttle body problems are caused by the dirtiness of the throttle body.

Also, check the fuel, oil, air filter, and tire pressure to know if any of them are faulty and need a repair or replacement.

2. Stalling Of The Vehicle

Chevy 350 Throttle Body Problems can cause your vehicle to stall at irregular intervals. This Chevy 350 throttle body problem occurs when the airflow through the throttle body is blocked. This is usually caused by a dirty or clogged throttle body.

Fix:

Cleaning the throttle body should be the first action to take. This is because vehicle stalls are usually the symptoms of heaped dirt on the throttle body. The dirt obstructs airflow to the engine. Thereby making the engine stall.

Check out the Chevy Starter Engagement Problems, as they might help you if you have any issues related to the starter.

3. Idling Problems

Clogging up of the throttle body is usually the most common cause of this Chevy 350 throttle body problem. When the throttle body is bad, the vehicle tends to start shaking or vibrating while idling. It also starts idling roughly and unsteadily.

Fix:

As this Chevy 350 throttle body problem is mostly caused by the clogging of the throttle body, cleaning the throttle body should stop your car from idling erratically.

4. Illumination Of The Check Engine Light

A faulty throttle body can also cause the check engine light to be turned on. This Chevy 350 throttle body problem occurs when there is an issue with the throttle position sensor, and when the throttle body is dirty.

Fix:

Examine the throttle position sensor for any damage or fault. If found faulty, fix the throttle position sensor. Cleaning the throttle body can also fix this check engine light issue.

5. Increased Fuel Consumption

Since a bad throttle body blocks the airflow to the engine, the car engine will have a greater workload to bear while running. This leads to an increase in the consumption of fuel by the engine.

Fix:

Inspect the throttle body for any damages or faults, and repair or replace it based on the result of your inspection. If the throttle body is dirty, use an appropriate cleaner to clean it. These should solve the fuel economy issue of the vehicle.

You may also like this article on the Common Problems with Chevy 305.

Best Chevy 350 Throttle Body Cleaner

Berryman B-12 Chemtool Throttle Body Cleaner

Berryman B-12 is capable of dissolving varnish, fuel residue, gum, and carbon build-up from the throttle body, choke, PCV valve, carburetors, and the linkages.

Berryman’s B-12 cleaner is manufactured with 100 percent high-energy solvent technology that enables it for excellent performance. The cleaner provides your vehicle with better fuel economy and improved vehicle operation.

Chevy 350 Throttle Body Repair Guide

Some Chevy 350 throttle body problems can be solved by just cleaning or a few repairs. On the other hand, most severe throttle body problems are fixed by replacing the throttle body with a new one.

Chevy 350 Throttle Body Repair

Here is a guide to repairing the Chevy 350 throttle body engine yourself:

  1. Break the connection of the battery’s negative terminal. This is necessary to avoid electrocution while performing the throttle body replacement.
  1. To get more passage to the throttle body, remove the air intake hose.
  1. Use a ratchet and a socket to take out the bolts holding the throttle body in place.
  1. Take the throttle body out of the vehicle.
  1. Use an appropriate throttle body cleaner, a towel, and a brush to clean the throttle body.
  1. Take back the throttle body and screw its bolts to hold it in place. If the throttle body is damaged past fixing, replace it with a new, compatible, and properly functioning throttle body.
  1. Restore the battery’s negative terminal connection.
  2. Start the vehicle, and test it to confirm that the problem is completely fixed.

What Are The Symptoms Of A Failing Chevy 350 Throttle Body?

Symptoms Of A Failing Chevy 350 Throttle Body

These are the Symptoms Of A Failing Chevy 350 Throttle Body:

  1. Accumulation of dirt on the throttle body.
  2. Illumination of the check engine light.
  3. Vacuum leakage.
  4. Inadequate production of power.
  5. Problems with acceleration while driving.
  6. Increased fuel consumption.

How Do I Reset My Chevy 350 Throttle Body?

You will need a stopwatch for this exercise.

Follow these steps to Reset My Chevy 350 Throttle Body:

  1. Completely release the accelerator pedal of the vehicle.
  1. Turn the ignition switch on for two seconds and turn it off. After ten seconds, turn it on for another two seconds and turn it off.
  1. With the accelerator pedal fully released, turn on the ignition switch for ten seconds and turn it off for ten seconds. While the ignition switch is on, the throttle sound is supposed to be heard and terminated when the ignition switch is turned off. You can use this sound to determine if the throttle valve is functioning.
  1. Ensure that all appliances that consume power are turned off. Then, turn on the ignition switch for three seconds. Use full force to press down on the accelerator pedal and release it five times in five seconds. 

After this, wait for seven seconds and completely press down on the accelerator pedal again. Release the pedal for three seconds and idle the engine for twenty seconds. The lights are supposed to shine during this period.

What Problems Can A Bad Throttle Body Cause?

  1. Misfiring of the engine.
  2. Low power production.
  3. Failure of the catalytic converter.
  4. Damage to the engine.

Top 5 Chevy Spark Throttle Body Problems

These are the Top 5 Chevy Spark Throttle Body Problems:

  1. Transmission shifting problems.
  2. Issues with the engine’s idle speed regulation.
  3. Illumination of the check engine light.
  4. Vehicle stalling.
  5. Lack of power.

It can also cause solenoid issues and if that’s the case, check out my fixes for Chevy Equinox Solenoid Problems.

Chevy 350 Throttle Body Diagram

This is the Chevy 350 Throttle Body Diagram:

Can A Throttle Body Be Adjusted?

The throttle body of your Chevy 350 can be adjusted.

Does Changing Throttle Body Increase Horsepower?

Changing the throttle body with one that has a larger spacing and bigger straps will increase the airflow into the engine. This also boosts the power and torque production of the engine.

Conclusion

Chevy 350 throttle body problems are better fixed earlier than later. I hope that with the help of this article, you will be able to fix your Chevy 350 throttle body problem(s) and get your engine running smoothly.