engine rattling when accelerating

[ddog1216]

when i accelerate i can hear a rattling noise in the engine when i put in park or neutral and accelerate i cant hear anything rattling goes away what is causing the noise. been happening for 2 weeks and i drove the car today and it sound good no rattling at all just seening what can cause the rattling

[fastblackmerc]

when i accelerate i can hear a rattling noise in the engine when i put in park or neutral and accelerate i cant hear anything rattling goes away what is causing the noise. been happening for 2 weeks and i drove the car today and it sound good no rattling at all just seening what can cause the rattling

That sounds like it's knocking / detonation. Detonation = death to the MM's engine.

What grade fuel are you using?

Any work done recently?

http://en.wikipedia.org/wiki/Engine_knocking

[Curless]

Sounds like bad fuel...

[martyo]

Any mods on car, recent or otherwise?

Any tune on car?

[ddog1216]

changed fuel filter cleaned idle air control valve and added rxp to the gas

[ddog1216]

premium gas only

[martyo]

added rxp to the gas

Garbage and probably trashed your plugs.

[Marauderjack]

WTF is rxp??:confused:

[ddog1216]

rxp is fuel treatment

[Marauderjack]

What's it supposed to do??:cool:

[RubberCtyRauder]

http://www.rxp.com/

[fastblackmerc]

premium gas only

When did it start?

Is it possible there was regular gas added by mistake...... yours or the station?

[fastblackmerc]

I was up in New Jersey a few years ago. Told the attendant to fill up with premium / high test.
Moron filled up with regular. Had to baby the Marauder until I could fill up in Virginia.

I believe New Jersey is the only state that requires an attendant to pump gas.

[robertmoreno14]

Cause #1
try not to use any other gas than premium. I bought my marauder and the previous owner was using regular. talk about knocking. lol. took 3 weeks for the knocking to go away.

Cause #2
you could be low on oil. or your oil filter is dirty. try using motorcraft filters. seem to work the best.

Cause #3
your timing chain tensioners are going bad.

bottom line, take care of your engine. and in return it will take care of you.

[ddog1216]

car sat for a few months before i bought, car stalled alot so gave tune up, change cops, change oil and added k&n cold air intake. Then I changed fuel filter which was real dirty and cleaned iacv so i added fuel treatment since fuel filter was dirty. Could be bad gas but i only use premium gas

[fastblackmerc]

car sat for a few months before i bought, car stalled alot so gave tune up, change cops, change oil and added k&n cold air intake. Then I changed fuel filter which was real dirty and cleaned iacv so i added fuel treatment since fuel filter was dirty. Could be bad gas but i only use premium gas

You can be pumping and paying for premium when actually your getting regular. It's happened before.. gas delivery driver fills tank with wrong grade of fuel.

[Logizyme]

Some wild guesses no one has metioned yet:

Cracked flexplate

damaged catalytic converter


oh and oregon also requires an attendant to pump your gas.

[PuntyMario]

sounds like you have what i have. A rattle during low rpm acceleration. Very apparent in 3rd and od as the torque converter locks up. how often does youre rattling occur? all rpm ranges? i either put in 91 oct or 94 oct. when i bought the car the dealer put in a nice complimentary half tank of regular......

[71cyclone]

sounds like you have what i have. A rattle during low rpm acceleration. Very apparent in 3rd and od as the torque converter locks up. how often does youre rattling occur? all rpm ranges? i either put in 91 oct or 94 oct. when i bought the car the dealer put in a nice complimentary half tank of regular...... If you have a SCT tunner, retard your preliminary zero to 2000 rpm 2 degrees and ,that should correct it.:burnout:

[Curless]

Its spark knock, bad gas, wrong grade of gas, what ever the cause, drive it lightly till you run this tank out. Head to a name brand station and fill with premium. Try it again after about half of that tank is gone.

[ddog1216]

it was bad gas

[fastblackmerc]

it was bad gas

Stop eating all those tacos!!!!!!!!!!!!

Glad you found it.