i have a 83 f 150 4x4 with a 300 6cyl. starts great and runs good for about 5 min.

Asked by goodysoleford Apr 03, 2016 at 09:48 PM about the 1983 Ford F-150 STD Standard Cab 4WD LB

Question type: Maintenance & Repair

after about 5 mins it loses power,idles rough and backfires threw carburetor
when i give it gas. after it sits for a bit it fires right up runs great for about
5mins. carb is new and has been working good. any ideas

4 Answers

345

Check the fuel pressure going to the carburator. If you have a weak fuel pump, the pressure might be insufficient to maintain pressure after the engine has run awhile. Try a heavy throttle foot as soon as the engine is fired up. If it starts losing power immediately, that's another clue. If you have good fuel pressure, try testing the PCV valve, and see if it is sticking. If the truck hasn't been tuned up in a while, some new ignition parts may be in order, and you should have the output of the coil tested.

74,190

The condition is known as "spitting" or "front-fire" through the carb. Check all components of the electrical system, expecialy the spark wires - making sure they are in good condition and not touching. Also check the distributor cap for cracks. As this occurs when the engine has warmed up, check any and all plastic-rubber components for failure which will expand after heating up.

check the cat. converter on the ex system. its prob. stopped up. mine was

Your Answer:

F-150

Looking for a Used F-150 in your area?

CarGurus has 15,725 nationwide F-150 listings starting at $1,712.

Postal Code:

CarGurus Experts

  • #1
    OJ
    Reputation
    42,460
  • #2
    Gene Arnett
    Reputation
    16,040
  • #3
    Rowefast
    Reputation
    15,840
View All

Find great deals from top-rated dealers

Search

Related Models For Sale

Used Ford F-250
6 listings
Used Ford Ranger
15 Great Deals out of 1,439 listings starting at $2,888
Used Ford Mustang
49 Great Deals out of 1,268 listings starting at $4,995

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use. Content will be removed if CarGurus becomes aware that it violates our policies.