Very high idle at startup

40

Asked by GuruWWNYF Apr 23, 2018 at 05:38 PM about the 1992 Ford F-150 S SB

Question type: General

I have a 1992 F150 4.9 l. Everytime I start her up
she revs high and then backs down in approx. 5
seconds. We've checked or changed everything as
far as sensors. Cleaned valves and butterflies.
What might be going on? Help!!

5 Answers
40

GuruWWNYF answered 6 years ago

Yea, I've had it for 5 years. This revving just started 2 weeks ago. Other than that it runs great and idles fine. Whatever is happening, is stopping it from throwing a code. We've cleaned and changed out sensors but rev still there. I'm thinking vacuum leak somewhere.

4 people found this helpful.
Mark helpful
50

Julio80211 answered 5 years ago

Did you find out what the problem was?? That's the same issue with my truck?

5 people found this helpful.
Mark helpful
30

denver answered 3 years ago

a bad throttle position sensor does this - should 1 volt at idle and go up with throttle

1 people found this helpful.
Mark helpful

Your Answer:

Related Questions

  • Very high idle at startup 5 Answers

    I have a 1992 F150 4.9 l. Everytime I start her up she revs high and then backs down in approx. 5 seconds. We've checked or changed everything as far as sensors. Cleaned valves and butterflies. Wh...

    1992 Ford F-150 S SB

    -

    General

  • Very high idle 3 Answers

    So i have a 92 Ford F150 Flareside that I am rebuilding. 2 WD, single cab, 4.9L straight 6. I just replaced the whole exhaust system. Everything from the manifold down to the pipes are new. It alw...

    1992 Ford F-150

    -

    Maintenance & Repair

  • High idle at startup 9 Answers

    My 01 jeep grand Cherokee 4.0 recently started idling high when started around 1500-2,000rpms and it doesn't come down sometimes it will actually go higher like someone is punching the gas and has...

    2001 Jeep Grand Cherokee Laredo 4WD

    -

    General

  • Why is the charge gauge on my 1985 ford f150 reading very high? 3 Answers

    After I installed a new alternator in my 1985 Ford F150 about a month & half ago the charge gauge started to fluctuate, a mechanic friend checked the voltage & said it was fine. Last weekend my daug...

    1985 Ford F-150

    -

    General

  • 2006 FX150 High Boy? 1 Answer

    Was this "High Boy" edition a factory option, or is the lift and suspension upgrades all after market ?

    2006 Ford F-150

    -

    General

F-150

Looking for a Used F-150 in your area?

CarGurus has 13,742 nationwide F-150 listings starting at $3,800.

Postal Code:

Shortcuts

Search Ford F-150 Questions

CarGurus Experts

  • #1
    OJ
    Reputation
    41,830
  • #2
    Gene Arnett
    Reputation
    15,990
  • #3
    Rowefast
    Reputation
    15,480
View All

Find great deals from top-rated dealers

Search

Related Models For Sale

Used GMC Sierra 1500
132 Great Deals out of 8,251 listings starting at $3,000
Used Ford F-250
6 listings
Used Ford Mustang
37 Great Deals out of 1,639 listings starting at $8,800
Used Ford Ranger
24 Great Deals out of 699 listings starting at $8,999
Used Jeep Wrangler
128 Great Deals out of 5,963 listings starting at $6,500
Used Ford Explorer
63 Great Deals out of 2,041 listings starting at $6,990
Used Toyota 4Runner
26 Great Deals out of 542 listings starting at $9,999

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.