Q: Engine revving, backfiring, cannot accelerate past 40 mph - 1990 Chevrolet G30

asked by on

Whenever I rev the engine, I notice backfiring. I think it's coming from the carburetor area. It makes a popping noise. I'm unable to accelerate past 40 mph. The engine never stops revving and cannot idle down. I had the fuel filter replaced. The carburetor hose to the distributor cap is good. What might be the problem?

The poor performance and backfiring through the intake you mention are signs of a "lean" condition - not enough fuel for the amount of air flowing through the engine. You may have a vacuum leak or Idle Air Control valve problem. If you find you are still having issues with this, a professional expert from YourMechanic can come to your home, and diagnose the backfiring issue and make any necessary repairs.

Was this answer helpful?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
  1. Home
  2. Questions
  3. Engine revving, backfiring, cannot accelerate past 40 mph - 1990 Chevrolet G30

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: What could be wrong with my truck?

When you have a vehicle that is 27 years old it can be most anything causing the vehicle to hesitate. Depending on the engine you have you may have a sensor issue that is not working correct or a fuel...

Q: Do you work on motorcycles? i need a carburetor r&r. 2004 Yamaha V Star 1100

We normally do not work on motorcycles but on that note you still should check with customer service to see if the mechanics in your area may be experienced and work on motorcycles. I for one have experience on motorcycles...

Q: Intermittently doesn't start

Hi there. There could be several reasons for your vehicle's intermittent no start issue. From the description you have given, I would not think the ECU (electronic control unit) is your vehicle's problem. Assuming the ECU is not recognizing the...

Related articles

What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...
What are the Car Pool Rules in Hawaii?
Hawaii is widely regarded as a land of vacation and relaxation, and as such, its scenic roads and routes are far better known than the state’s freeways. But, as with all...