What's causing my vacuum leak?

5

Asked by Apr 14, 2015 at 12:37 PM about the 2000 Mercury Cougar 2 Dr V6 Hatchback

Question type: Maintenance & Repair

I have a 2000 Mercury cougar  v6.  Whenever the outdoor temperature is below 75
degrees and i go more than 45 mph, a vacuum leak opens up causing a host of issues
(including failure of the vacuum assist breaks), but once the engine warms up, the leak
closes and the car drives fine.  Because it's so sporadic, neither me nor my mechanic can
find the leak. What are the most likely culprits to be causing this?

1 Answer

5

Update: I replaced the IAC which helped a little bit, but didn't eliminate the problem. I have also noticed that the engine will rev ( usually up to 2500 rpm) whenever I use the brakes.

Your Answer

Add photo

Related Questions

  • vacuum assist brake problem 2 answers

    I have a 1968 Mercury Cougar XR7. The brakes hardly work(very hard ) The lines, wheel cylinders and master cylinder are all new. the engine is rebuilt and has a low end cam in it. How can I test the b...

    1968 Mercury Cougar

    -

    Maintenance & Repair

  • Tranny slippage in OD only 1 answer

    I just failed AZ Emissions Ck yesterday. Not due to emissions. Transmission slippage in O/D gear position. Any other gear selections. No slippage. I can hear a vacuum leak. Sound adjustable by accele...

    1992 Mercury Cougar 2 Dr LS Coupe

    -

    Maintenance & Repair

  • Leaking gas in engine compartment 4 answers

    My car is leaking gas, it's a 2000 cougar manual transmission, not sure if it makes a difference, but it's not the gas tank and its not from underneath, any idea What I can do to fix it? I'm g...

    2000 Mercury Cougar 2 Dr V6 Hatchback

    -

    Maintenance & Repair

  • 2001 Mercury cougar rpm's racing in idle, dying at a stop. Already replaced the air control valve. What is it now? 4 answers

    My sons mercury cougar was racing in idle, rpm's would go up. We were told to replace the idle air control valve, which we did. It is still doing it and sometimes at a stop it will die, it didn't s...

    2001 Mercury Cougar 2 Dr V6 Hatchback

    -

    Maintenance & Repair

  • What could cause a small vacuum leak 3 answers

    Unfortunately right before I went to sell my deceased fathers 2010 mercury Milan the check engine light came on, according to dealer because of a very small vacuum leak, anyone know what could cause...

    2010 Mercury Milan V6 Premier

    -

    Maintenance & Repair

Search Mercury Cougar Questions

Mercury Cougar Experts

#1 lisagayle
lisagayle
Reputation 2,180
#2 Tom Demyan
Tom Demyan
Reputation 700
#3 Jessica Cornelison
Jessica Cornelison
Reputation 590
View All

Related Models For Sale

Used Ford Mustang
331 Great Deals out of 45,576 listings starting at $2,000
Used Mercury Grand Marquis
27 Great Deals out of 1,801 listings starting at $500
Used Chevrolet Camaro
136 Great Deals out of 35,100 listings starting at $1,995
Used Chevrolet Corvette
117 Great Deals out of 20,537 listings starting at $3,499
Used Chevrolet Impala
543 Great Deals out of 28,509 listings starting at $700
Used Chevrolet Monte Carlo
12 Great Deals out of 1,410 listings starting at $2,511
Used Pontiac Firebird
9 Great Deals out of 758 listings starting at $1,800
Used Pontiac Grand Prix
19 Great Deals out of 2,825 listings starting at $1,595