My4.6 l thunderbird is pulsing back an forth from 600-900 and back constantly?

Asked by Jan 18, 2015 at 09:09 AM about the 1997 Ford Thunderbird LX

Question type: General

It will start and drive fine but constantly pulse from 600 rpm to 900 or 1100 rpm and back
Seams to be getting worse!

3 Answers

465

Check your transmission fluid for both color and level.

20

Possibly throttle possition sensor

72,405

If this is an idle problem I'd suspect the IAC (Idle Air Control) valve. Unplug it. If the idle stops "hunting" replace the IAC. HTH. -Jim

Your Answer

Thunderbird

Looking for a Used Thunderbird in your area?

CarGurus has 1,053 nationwide Thunderbird listings starting at $6,800.

ZIP:

Ford Thunderbird Experts

  • #1
    Larry Sturgis
    Reputation
    1,660
  • #2
    Tom Demyan
    Reputation
    1,630
  • #3
    tennisshoes
    Reputation
    1,280
View All

Related Models For Sale

Used Ford Mustang
587 Great Deals out of 38,990 listings starting at $1,895
Used Chevrolet Corvette
170 Great Deals out of 17,497 listings starting at $3,000
Used Chevrolet Camaro
450 Great Deals out of 31,345 listings starting at $1,450
Used Ford F-150
3,217 Great Deals out of 219,866 listings starting at $1,200
Used Mazda MX-5 Miata
80 Great Deals out of 4,230 listings starting at $2,995
Used Porsche Boxster
47 Great Deals out of 1,288 listings starting at $4,500
Used Jaguar XK-Series
34 Great Deals out of 634 listings starting at $4,000
Used Mercedes-Benz SL-Class
68 Great Deals out of 3,528 listings starting at $4,500
Used Mercury Cougar
178 listings
Used Pontiac Firebird
9 Great Deals out of 770 listings starting at $4,000
Used Porsche 911
122 Great Deals out of 5,129 listings starting at $10,947

Used Cars For Sale

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.