Topic: What is a good top engine additive for our 2.5's?

[Jeffy]

You're lucky that dust cover made noise then.

[Sine Deviance]

You're lucky that dust cover made noise then.

Why is that? I would have still looked because of the vibrations on takeoff anyway.

[GBJeep]

Thats funny.  I had the same thing happen to me a while back.  I had to rebuild my transmission (should have swapped out for something better) and I had a horrible noice underneath about a week later.  Scared the crap out of me until I figured out that is all that it was. 

[jeep2.5]

You should use top engine cleaner. Pull the vacuum hose off the brake booster, have some body rev the motor up so i doesent dye and suck the top engine cleaner up the vacuum line. You will know it is going through because there will be alot of white smoke out yourf tail pipe. Dont use the hole bottle, you can hydrolock the motor. Rev it up a couple times until it will idle on its own. Then shut it off and let sit for about an hour, the go drive it to blow it out. my 2.5 has a head and new valves and it is still noisy but not like it was. It will help the performance also.

[sharpxmen]

You should use top engine cleaner. Pull the vacuum hose off the brake booster, have some body rev the motor up so i doesent dye and suck the top engine cleaner up the vacuum line. You will know it is going through because there will be alot of white smoke out yourf tail pipe. Dont use the hole bottle, you can hydrolock the motor. Rev it up a couple times until it will idle on its own. Then shut it off and let sit for about an hour, the go drive it to blow it out. my 2.5 has a head and new valves and it is still noisy but not like it was. It will help the performance also.

this technique is risky imo, you shouldn't suck in any liquid into the cylinders - but just my opinion

if you pull the  booster hose it wont die unless is carbed or uses a MAF sensor, for Jeeps with a MAP will rev up due to more air being let into the intake and less vacuum read by the MAP sensor (same as with opening the throttle).

[Jeffy]

A product called Seafoam is commonly used.

[sharpxmen]

there's a difference between pouring or spraying in a small quantity and sucking into the intake, but to each his own - just a heads up to watch for bent connecting rods or cracked cylinder head or even damaged pistons afterwards. if you get more liquid into the cylinder than the volume of the compression chamber you're in for some fun, if it's less than that would probably be ok.

[brokenwrist21]

I dont know what ya'll are hearing in your motors, mine has 155,000 miles on it, and even before the roller rockers the engine was quite. so if your hearing valve train noise there's issues. i pulled a rocker assembly off my 92 and found a bent rocker bridge from over revving. i would pull the valve cover and check the valve lash. push rods should not move up and down, only able to spin.