1979 ford f250 460 knock??
195

Asked by Holden Jul 08, 2015 at 04:47 PM about the 1979 Ford F-250

Question type: Maintenance & Repair

Hi guys, i have a 79 f250 with the 7.5 v8 that has been modified. Just today the engine
started making a knock sound. Its fairly loud and every time i give it throttle it gets
louder and faster and comes close to stalling. The truck has been sitting for about a
month or so due to some electrical issues (electrical fires) and a bad starter. I finally
got it back up and running good today and when i went to pull out of my shop it started
making the noise. It could be the gas from just sitting. It sat almost on empty. I dont
think it would be spark plugs because its ran fine up untill now. Within the past few
months ive ran 2 or 3 bottles of fuel additive through it. Any ideas or comments are
much appreciated. It was my great grandpas truck he bought in 79 and he modified it
fairly heavily. Im pretty sure he put a cam, edelbrock 4 barrel carb, intake manifold,
lifters, and 429 heads on it. Thanks for the help!

4 Answers
70,055

Kelly answered 8 years ago

get a long screwdriver ,broom handle...place it on each exhause port and to your ear and listen with it running.....if one is more pronounced pull that side valve cover off and look for anything funny.if all is ok....next thing drop the pan..

3 people found this helpful.
Mark helpful
195

Holden answered 8 years ago

this is a video to help what it sounds like https://www.youtube.com/watch?v=SzLW2pM_e_k&feature=youtu.be

2 people found this helpful.
Mark helpful
395

Eric answered 8 years ago

exhaust leak, or dropped a valve is what pops in my head from what I read about it.

Mark helpful
20

Brokeee answered 5 years ago

Does it have oil pressure if not your lifters may not be filling with oil you may have crap clogging the oil pump screen not allowing oil flow at least this is what happens to my 1979 460

2 people found this helpful.
Mark helpful

Your Answer:

Related Questions

  • 1979 ford f250 460 knock?? 4 Answers

    Hi guys, i have a 79 f250 with the 7.5 v8 that has been modified. Just today the engine started making a knock sound. Its fairly loud and every time i give it throttle it gets louder and faster and ...

    1979 Ford F-250

    -

    Maintenance & Repair

  • F250 1979 460 - auto 2 Answers

    What type of auto do I have in 1979 f250 with a 460?

    1979 Ford F-250

    -

    General

  • My 97 F250 Ford, 460 cubic inch engine (gasoline) is hard to start 2 Answers

    My 97 F250 Ford, 4x4 460 cubic inch engine (gasoline) is hard to start sometimes it will crank and sometimes it smokes the power cable the one that burns is the smaller ground cable that goes to the ...

    1997 Ford F-250 2 Dr XLT 4WD Extended Cab LB HD

    -

    Maintenance & Repair

  • 1994 Ford F250 460.. no power 9 Answers

    I have a ford that has been worked on a lot in the past years. Ran strong till.... I recently placed a new EGR and the IAC valve. Then went to drive it to work and it loses power. The rpms are up ...

    1994 Ford F-250 2 Dr XL 4WD Standard Cab LB

    -

    Maintenance & Repair

  • 1989 f250 w/460 4 Answers

    We have a 1989 f250 with a 460. No spark to the distributor. We replaced the coil and still no spark. Checked all connections and fuses. And nothing. What else could it be?

    1989 Ford F-250 XLT Lariat Standard Cab 4WD LB

    -

    Maintenance & Repair

F-250

Looking for a Used F-250 in your area?

CarGurus has 7 nationwide F-250 listings and the tools to find you a great deal.

Postal Code:

Shortcuts

Search Ford F-250 Questions

CarGurus Experts

  • #1
    Gene Arnett
    Reputation
    2,070
  • #2
    MikeSt
    Reputation
    990
  • #3
    MrRatchet42
    Reputation
    800
View All

Find great deals from top-rated dealers

Search

Related Models For Sale

Used Ford F-150
336 Great Deals out of 13,399 listings starting at $3,000

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.