72 F100 recommended RPM? Tuning Eddy w/ vac gauge...
35

Asked by maravich14 May 10, 2016 at 11:23 PM about the 1972 Ford F-100

Question type: Maintenance & Repair

Trying to tune my 72 F100 in w/ vac gauge and tachometer. The vac doesn't increase past 6 turns on each mixture screw. For some reason, it runs ok in park, then is rough in drive. Is there a recommended RPM I should aim for in park and drive? C4 trans.

4 Answers
159,085

Bob answered 8 years ago

Way back when we just turned the mixture screws for highest rpm at engine idle and then turned them out an additional 1/8 to 1/4 of a turn. Not sure if that is the correct procedure, but it seemed to work. Spark plugs wires and other ignition parts need to be in good working order for the carb adjustment to work properly. I would think 700 to 800 rpm in Park would be good.

Mark helpful
223,915

Rowefast answered 8 years ago

Screw the vacuum gauge, If everything is good, no vacuum leaks, the gauge will show 15 to 18 inches per square pounds. Use your tack. Start by screwing in the idle mixture screws until they stop, then back them out 1 1/2 turns, then start the engine. From this point you adjust the idle mixture screws in or out (more than likely out) to the highest RPM you can get out of them, adjusting the idle to keep it at 650 RPM's when you do. Once you cannot get any more RPM's out of the idle mixture screws from 650 RPM (idle) turn them out further 1/4 turn for proper air/fuel mixture.

1 people found this helpful.
Mark helpful
159,085

Bob answered 8 years ago

Good job Rowefast, I forgot about turning the screws out 1 1/2 to 2 turns from the bottom.

Mark helpful

Your Answer:

Related Questions

  • 72 F100 recommended RPM? Tuning Eddy w/ vac gauge... 4 Answers

    Trying to tune my 72 F100 in w/ vac gauge and tachometer. The vac doesn't increase past 6 turns on each mixture screw. For some reason, it runs ok in park, then is rough in drive. Is there a recommend...

    1972 Ford F-100

    -

    Maintenance & Repair

  • F100 1 Answer

    Restoring 54 F100 using 84 351 Windor need wiring help

    1954 Ford F-100

    -

    Maintenance & Repair

  • 1971 F100 manual transmission 1 Answer

    I'm replacing the 3 speed manual trans in my 1971 F100. Before I install the replacement trans I'd like to put fresh fluid in. What is the best fluid to use for a manual 3 speed trans of that age?

    1971 Ford F-100

    -

    Maintenance & Repair

  • 81 Ford f100 4.9 inline 6 dips rpm during idle sometimes dies. Possible problem? 3 Answers

    Hey I've been working on an 81 Ford f100 4.9 online 6 manual. She runs very well. The only issue I've been having is that sometimes when I let it idle after driving (usually about 30 minutes into t...

    1981 Ford F-100 Standard Cab LB

    -

    Maintenance & Repair

  • 1970 Ford F100 Stalls At Highway Speed 2 Answers

    I bought a 1970 F100 this week. After two days of running perfectly on two long trips - morning of day three started fine and at highway speed of 65 started to lose power as if running out of gas. ...

    1970 Ford F-100

    -

    Maintenance & Repair

F-100

Looking for a Used F-100 in your area?

CarGurus has 2 nationwide F-100 listings and the tools to find you a great deal.

Postal Code:

Shortcuts

Search Ford F-100 Questions

CarGurus Experts

  • #1
    Gene Arnett
    Reputation
    810
  • #2
    MrBlueOval
    Reputation
    510
  • #3
    Rowefast
    Reputation
    460
View All

Find great deals from top-rated dealers

Search

Related Models For Sale

Used Ford F-250
6 listings
Used Chevrolet C/K 10
3 listings
Used Ford Mustang
65 Great Deals out of 1,259 listings starting at $4,995
Used Chevrolet Blazer
19 Great Deals out of 872 listings starting at $19,499
Used Chevrolet Camaro
16 Great Deals out of 307 listings starting at $10,500

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.