hearing a clatter at high RPM but not at idle


Asked by Kims302 Jun 24, 2009 at 05:58 AM about the 2008 Mercury Mariner Premier

Question type: Maintenance & Repair

At first I thought it might be the gas but once the clatter starts it does not stop until the speed is reduced. The noise tends to get louder the longer I drive it. Dealer said it was a small piece in the parking brake release--give me a break! No engine light yet. Without the engine light on will the computer pick up anything?

1 Answer

Mike Sota

this sounds like a mechanical problem, it will most likely not set off a diagnostic trouble code at the PCM unless it effects some sensors there for no check engine light. Though it sounds like you may have a valve train problem, such as an incorrectly seating valve, which could be caused by worn valve guides, or worn valve springs which would float the valves causing your vacuum reading to pulse rapidly at idle, you should hook up a vacuum gauge and check.

Your Answer

Add photo

Related Questions

  • High Idle 8 answers

    i have a 93 5.0 thats idleing at 1800-2000 rpm have changed mass air,speed sencor,ia sencor, no vacume leaks and its throwing no codes anyone got any ideas???? thank you

    1993 Mercury Cougar 2 Dr XR7 Coupe


    Maintenance & Repair

  • Very high idle 5 answers

    Cleaned engine. Blew off, dried everything, disconnected all wiring connectors blew dry and reconnected all wiring, hoses, and removed all coilplugs blew out dried boots and applied dielectric lu...

    2002 Mercury Grand Marquis


    Maintenance & Repair

  • 93 merc topaz 2.3 idles too fast. 2000 rpm have to keep foot on brake at stop lights. 4 answers

    I get a tps (throttle positin sensor) code but the two screws are frozen in position.#3 and #4 Phillips screwdriver heads won't quite mesh. Liquid wrench doesn't help. The sensor is made out of plast...

    1993 Mercury Topaz 4 Dr GS Sedan


    Maintenance & Repair

  • why does my 92 topaz have an extreme high idle in park when car is warm 1 answer

    1992 Mercury Topaz


    Maintenance & Repair

  • Clattering noise from engine after doing timing belt service 8 answers

    The car has a clattering noise from the engine after doing a routine timing belt service. The shop did the job over and even replaced some of the completely new parts we installed but to no avail. I t...

    1992 Audi V8


    Maintenance & Repair

Search Mercury Mariner Questions

Mercury Mariner Experts

#1 2022erik
Reputation 160
#2 Tom Demyan
Tom Demyan
Reputation 120
#3 kbro
Reputation 70
View All

Related Models For Sale

Used Ford Escape"
1,359 Great Deals out of 92,417 listings starting at $750
Used Mercury Mountaineer"
69 Great Deals out of 1,669 listings starting at $1,395
Used Ford Explorer"
1,098 Great Deals out of 46,843 listings starting at $850
Used Mercury Mariner Hybrid"
6 Great Deals out of 99 listings starting at $5,449
Used Honda CR-V"
783 Great Deals out of 56,772 listings starting at $1,495
Used Jeep Liberty"
410 Great Deals out of 9,006 listings starting at $999
Used Jeep Grand Cherokee"
1,152 Great Deals out of 66,409 listings starting at $500
Used Toyota RAV4"
763 Great Deals out of 46,420 listings starting at $1,990
Used Mazda Tribute"
32 Great Deals out of 1,118 listings starting at $2,000
Used Ford Edge"
778 Great Deals out of 38,186 listings starting at $4,995
Used Toyota Highlander"
498 Great Deals out of 20,265 listings starting at $3,908
Used Nissan Murano"
356 Great Deals out of 24,223 listings starting at $2,980
Used Jeep Patriot"
414 Great Deals out of 33,371 listings starting at $3,995
Used Mercury Milan"
47 Great Deals out of 1,267 listings starting at $999
Used Kia Sorento"
486 Great Deals out of 32,886 listings starting at $1,795

Used Cars For Sale

2011 Mercury Mariner Premier For Sale
38 listings starting at $9,886
2010 Mercury Mariner Premier For Sale
81 listings starting at $7,825
2009 Mercury Mariner Premier For Sale
42 listings starting at $6,000
2008 Mercury Mariner Premier For Sale
4 Great Deals out of 74 listings starting at $5,995
2007 Mercury Mariner Premier For Sale
16 listings starting at $5,999