Q: 61 ford Galaxie with 390. Low rpm, car backfires no power and stalls. Fine at freeway speeds.

asked by on

I have a 1961 ford Galaxie with a big block 390.. it starts up fine. After driving for awhile she will backfire every so often, but at low speed/rpm’s she loses power at acceleration, backfires loudly and stalls. Have to shift back into park to keep car idling..At normal driving or freeway speeds car seems to run fine. Noticed the other night we went on cruise with bunch of other cars looking at Christmas lights through neighborhoods.. cars started to run rough at the slow pace we were driving... but once I was able to get some speed she ran normal
My car has an automatic transmission.

Backfiring is often caused by a too lean or too rich air-to-fuel ratio although a few other causes are discussed below. A backfire in the intake manifold is caused by a ratio that is too lean (not enough fuel). A backfire out the exhaust system is caused by a ratio that is too rich (too much fuel). If backfiring is occurring, it is recommended that you request a diagnostic to identify and resolve the root of the problem. Some other possible causes of backfiring are moisture or resistance in the car’s ignition system that allows a crossover generation of current to the wrong cylinder; a lean mixture caused by either an engine vacuum leak or low fuel-pump pressure; faulty ignition components or spark plugs may also cause backfires if the ignition timing drifts off or the plugs fire intermittently; and an exhaust leak such as broken welds or other small holes can take in cool air during deceleration and cause a popping or backfiring in the exhaust system. If you request a backfiring diagnostic the responding certified mechanic will get this taken care of for you. If you have further questions or concerns, do not hesitate to re-contact YourMechanic as we are always here to help you.

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. 61 ford Galaxie with 390. Low rpm, car backfires no power and stalls. Fine at freeway speeds.

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: Check engine light and fuel cap stay on.

Hi there: In most newer trucks, like your 2014 Ram, if an error light is triggered and the repairs are made, you'll have to clear those stored error codes in the ECU with a digital scanner or they will stay...

Q: How do I use the navigation system?

If your vehicle is equipped with a navigation system, it will help you find directions where you need to go. Your navigation will appear on the center display. To use the navigation system. Type in the address you need...

Q: High temperature with acceleration - 2013 Dodge Challenger

Hello there, under all driving condition your 2013 Dodge Charger, the temperature should not rise outside normal operating temperatures. If the engine is getting hot during acceleration, then there is likely a problem. The most common faults would be a...

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 Distributor O Ring Last?
The distributor is part of the ignition system in your vehicle and its purpose is to route high voltage from the ignition coil to the spark plug. The spark plug then...
How to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...