i have a 99 durango slt 5.2 stock ,when i rev my engine up it makes this rattling noise like if i had the wrong gas but its really loud, if i let go of the gas the engine is really quiet ,if anybody has any ideas it would be great.thank you

 

Yes, Your engine making a pining noise. To fix the problem is buy better fuel or a flash update on the PCM.

 

i will try thank you ill give update

 

Papo:

Since you have the 5.2 motor, remove the air hat from your throttle body, and look down inside with a flashlight. If it appears to be oily and wet down there, your belly pan gasket has gone south. If this is the case, you will want to repair it before the engine self destructs on you. BTWm are you seeing anyblue smoke from your tail pipe?? Is the engine using a greater amount of oil between changes than normal?? These are all signs of the belly gasket syndrome.

Don

 

the size of my engine it actually a 5.9 and the rattling happens at high rpms ,im waitting to get it registerd today then i going try better gas

 

Papo:

The syndrome I speak of applies to both the 5.2 and 5.9 engines are they are from the same design family. When you say at high rpms, do you mean that you can sit in your driveway and run up to say 2500-3000 rpms and hear this noise?? How is your oil consumption??

Have you had this D for a while, or did you just buy it??

Don

 

i just bought it and yes when i sit in my driveway and rev it up i hear it

 

its not the gas it sounds like there is some thing loose somewhere in the front middle part of the engine getting ground up by some gears is the only way i could discribe it i just ran the truck through emmisions and it pass my oil pres is fine a little under 40, i was thinking waterpump or ac comp thats the places that it hit hardest.

 

Papo:

Ok, if you feel that it might be either the WP or the A/C, try removing the serpentine belt. Then fire up the motor for a minute or so and see if you still hear the noise. If not, then you have narrowed it down quite a bit.

Only run it for a short time though, as you will have not water pump flowor cooling fan with the belt off.

Don

 

well i got bad news today it was my engine it was rod knock my engine was blown ,i had to get one from the junkyard its coming of a 94 dodge ram i just hope everything fits good when they swicth it over i found some one to put it in for 450 every body else i spoke to wanted over 3000 to swicth it if they got one from a junk yard .thank you guys for your input