Have a 1988 crown vic, recently it started to idle very fast when letting off of gas pedal. I was in line at bank when it revved up. I put it in neutral and rpms must have increased to 3000.

Asked by Dec 01, 2013 at 07:15 PM about the 1988 Ford LTD Crown Victoria

Question type: Maintenance & Repair

When I put it in drive the rpms went back to normal.  this has happened several times.  It almost seems the throttle has stuck open.  I have also noticed that I can let off gas at 45 miles per hour and the speed will be maintained for mile or more or until I put on brakes to turn into drive.  What could be causing engine to just speed up while idling?

4 Answers

105,825

I would check for a vacuum leak.

1 out of 1 people think this is helpful.
15

i have a 86 crown vic lTD and my car did the same thing,there is cooling lines that go into the throdle body i by passed it and it has not done it since! all so could be EGR valve sticking

23,015

dandyoun has the right idea. 3000 RPM seems like a lot though. Your 302 (5.0L) is susceptible to vacuum leaks at the intake manifold too. Another thing to look at is the IAC valve and throttle body. They get a big build-up of crud over time and should be cleaned on occasion. (Another concern caused by the poor placement of the EGR)

2 out of 2 people think this is helpful.
15

yes i pulled my EGR off to clean, it was pretty drity carboned up

1 out of 1 people think this is helpful.

Your Answer

Add photo

Related Questions

  • when car idles the rpms pulse like someone is pumping the gas 18 answers

    I have a 2003 Explorer sport and recently when the car idles the rpms pulse like someone is pumping the gas. the rpms only jump up about 500 and its seems like its getting worse. It pulses about twice...

    2003 Ford Explorer XLT Sport V6

    -

    Maintenance & Repair

  • Why does the idle jump to 3000 rpm when ac is turned on? 4 answers

    I work at an automotive repair shop, we have a 2000 Ford Taurus 3.0L Duratec Vin "S". Customer complaint was originally misdiagnosed and an IAC valve was replaced. Customer returned and I found a va...

    2000 Ford Taurus SE

    -

    Maintenance & Repair

  • idles wont pick up rpms 3 answers

    car starts , idles fine when you step on the pedal rpm goes up a little if you prmp the pedal you might get it up to 3000 rpm when you try to drive it you might get it up to 20 mph. fuel pump changed...

    1993 Ford Thunderbird LX

    -

    Maintenance & Repair

  • What could be the possible reasons my 91 Mustang turns over rev's to 3000 RPM's and cuts off? 2 answers

    When I start my 1991 Mustang it will turn over, I step on the gas and it will rev to 3000 RPM's and cuts off.

    1991 Ford Mustang LX Hatchback

    -

    Maintenance & Repair

  • why wont my 4.3 rev past 3000 rpm 9 answers

    my 4.3 idles good but wont rev over 3000 rpm. it has new tuneup, fuel filter

    2003 Chevrolet S-10 3 Dr LS 4WD Extended Cab SB

    -

    Maintenance & Repair

LTD Crown Victoria

Looking for a Used LTD Crown Victoria in your area?

CarGurus has 16 nationwide LTD Crown Victoria listings and the tools to find you a great deal.

ZIP:

Search Ford LTD Crown Victoria Questions

Ford LTD Crown Victoria Experts

#1 Tracy Hooks
Tracy Hooks
Reputation 240
#2 Michael Tutty
Michael Tutty
Reputation 150
#3 dandyoun
dandyoun
Reputation 70
View All

Related Models For Sale

Used Ford Crown Victoria
10 Great Deals out of 1,210 listings starting at $1,700
Used Mercury Grand Marquis
23 Great Deals out of 2,174 listings starting at $1,995
Used Lincoln Town Car
31 Great Deals out of 2,075 listings starting at $1,995
Used Chevrolet Caprice
175 listings starting at $12,998
Used Ford Thunderbird
15 Great Deals out of 1,106 listings starting at $6,900
Used Ford F-150
2,878 Great Deals out of 212,656 listings starting at $1,000
Used Ford Mustang
398 Great Deals out of 44,403 listings starting at $1,000
Used Lincoln Continental
3,737 listings starting at $42,995
Used BMW 7 Series
165 Great Deals out of 5,889 listings starting at $3,400