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2003 Mountaineer V8 AWD, The engine idle is up and down and sounds like a knocking from the back side of the engine.it will run no problem, but I was advised not to run it and research the problem.

I was thinking an exhaust or EGR problem, but I am not sure. At first I thought a rod because there was a pop before the noise started.

Posted by Anonymous on

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  • Cars & Trucks Master
  • 1,089 Answers

Start with checking for a vacuum leak (that may have been the pop?) Scan the ECM for codes & get readings. Poss TPS?

Posted on Aug 11, 2017

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Posted on Jan 02, 2017

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  • 315 Answers

SOURCE: loud knocking sound, complete loss of power, 1991 300zx

Wont know till you take it to a mechanic for troubleshooting.

Posted on Mar 05, 2009

johnjohn2
  • 5763 Answers

SOURCE: My 2003 Mercury Mountaineer V8 AWD transfer case

the problem is the chain inside strechs, could cause case damage, it will soon break and then truck wont move, depending on how bad it is you may be able to drive a bit more, threres just alot of strain there because of it being awd, if it is noisey it doesnt have to be replaced just fixed,good luck.

Posted on Oct 27, 2009

Testimonial: " Thanks! It does make noise, a clunking sound when I back up and cut the wheel to the left or right. The tires skip also. "

  • 70 Answers

SOURCE: 96 Suburban v8/7.4L/454 K2500, Knocking Noise??

sound like an internal engine problem. either one or more of the pistons has "piston slap" and that knocking will diminish as the engine warms up or possibly a rod bearing is worn out. have a tech do a manual oil pressure test to make sure the oil pump and main bearings are ok. piston slap or knock that decreases when the engine warms up is not that serious, but a rod bearing knock or possible oil pump failure should be taken care of asap.

Posted on Oct 29, 2009

Testimonial: "thanks, after reading what you've described it sounds exactly like the problem I'm having, looks like we'll be going to the shop."

  • 1 Answer

SOURCE: running rich. No power. 5.2 v8

93 Jeep grand cheorkee 5.2 L engine, no power is getting yo fuel pump

Posted on Feb 15, 2010

  • 335 Answers

SOURCE: 07 mountaineer awd front end

Check the front drive shaft u-joint, and front cv shafts on the front axle, may be worn and need to be replaced. These parts will make a clicking or popping noise may sound like a thud sound.

Posted on Mar 19, 2011

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1 Answer

Cylinder_diagram_location_2002_mercury Montaineer V8 AWD


1,2,3,4, Passenger Side
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1&5 are at the front of motor

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I have a 2003 Mountaineer v-8 AWD with "check


Left side,Drivers side

Either in the converter inlet or just ahead if it

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My 1997 Ford Explorer Eddie Bauer v8 AWD makes a really deep ticking/clicking sound when running. It's hard to describe the sound, but it's almost as if you can hear each piston cranking. As I accelerate...


It could be rod knock: if so, plan on an engine change/rebuild. On my 97 F 250, 5W motor oil is recommended,so you can't put in heavier oil. But that's not a solution. Something mechanical is askew.

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Engine sounds like a diesel


Need more info...

Whats the mileage??

Have you checked the oil level??

Take to Auto Tech to be sure.

May 11, 2010 | 2004 Mercury Mountaineer

2 Answers

Front differential broke in my 2003 mercury mountaineer v8 how much to fix


Depends I had a whole new used one put in for 1300...I had the front diff replaced 2x and the front driveshaft 2x a Drive shaft by shaftmaster is about 340. Some type of frame tweakage that throes it off. Always make sure you have the same tread on your Mountaineer if you have AWD.

Feb 08, 2010 | 2003 Mercury Mountaineer

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Idling Rough and check engine light


use a propane torch when the propane hits the vacuum leak the engine will stumble. try that... most likely an intake or plenumn gasket failure..........let me know how that works out

Dec 08, 2009 | 2003 Mercury Mountaineer

1 Answer

My 2003 Mercury Mountaineer V8 AWD transfer case needs to be replaced. What problems can occur if left untreated?


the problem is the chain inside strechs, could cause case damage, it will soon break and then truck wont move, depending on how bad it is you may be able to drive a bit more, threres just alot of strain there because of it being awd, if it is noisey it doesnt have to be replaced just fixed,good luck.

Oct 27, 2009 | 2003 Mercury Mountaineer

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Starter loction


starter is located on the lower passenger side of the engine on the tranny side underneather. you may have to remove skid plate or protective panels if so equipped

May 11, 2009 | 2000 Mercury Mountaineer

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2003 Mercury Mountaineer no heat


no you have to remove the vent between the hood and the windsheild its on the out side of the car it sounds like your freshair vent is stuck open

Dec 17, 2008 | 1997 Mercury Mountaineer

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