ok, we took my entire engine apart pretty much. the only thing that was connected to the engine was one engine mounting bracket and the tranny. when i got the oxygen sensor replaced the dodge dealer left the oxygen sensor tool on the sensor. we found that right before we were going to pull the head. um.. so ya... we thougt that was the issue, but when we put it together again, it only fixed one knock. all the valves move up and down, nothing loose there. the rods are perfect, adn the rod bearings are perfect. the piston wrist pin bearings are perfect, nothing loose on the piston. felt good. new timing belt, all the belts are fine. engine compression is 1) 185 2) 190 3) 175 and 4) 195, all within spec. the leak down test did not find anything. tapped on the caddalitac converter, and nothing is lose. nothing wrong with the alternator, no metal shavings in the pan, no marks inside the motor, rods and pistons move perfectly. we chaged the gaskets around the spark plugs b/c oil was going in to the spark plugs. dont know how the engine knocks when i am in idle no matter what gear, and its getting louder too.

:banghead:

What kind of gas do you feed her? If you put 87 oct, that could be problem. I know this is a stupid question, but you know, i had to ask.

What kind of gas do you feed her? If you put 87 oct, that could be problem. I know this is a stupid question, but you know, i had to ask.

I will try a tank of higher octane. maybe some fuel injector cleaner. Maybe sea foam.

thanks

Try atleast 91 oct or even 94oct if possable. Like i said, it was a kind of stupid question, but then agine, it could help, you never know.

ill try that

When you do that, run some fuel injecter cleaner through there, this will help get rid of any carbon build up if there is any.

When you do that, run some fuel injecter cleaner through there, this will help get rid of any carbon build up if there is any.

Put some fuel injector cleaner in got 1/2 tank of 87. The noise is less when the car is warm and you cannot even here anything when driving. If you rev the motor it goes away. Going to do a Marvel mystery oil cylinder soak. Maybe there is some carbon in one of the cylinders.

later

Wont that be to consintrated?(sp)

Wont that be to consintrated?(sp)

I just put 2 oz of marvel mystery oil down each cylinder and let the car sit for 24 hours. It is a fix for oil consumption on my saturn SL2. I figured it couldn't hurt this thing either. It is still making the noise. I took it out and drove around for a bit. It makes the noise on Deceleration and a little at idle and just off idle. It definately sounds like a rod knock. I called the dodge dealer for pricing on new pan gasket, rod bearings and new bolts. The parts guy said they don't have much problem with these cars with rod bearings. Also said as I know a bad rod bearing would make noise all the time and especially on acceleration.

What I don't understand is that we plasti-guaged all the rods and they are all perfect within specs.

My son's friend is taking it to his automechanic school to have the teacher look at it. I don't have a hoist. I would like to take it up in the air running and see what I could see.

The car had 3/4 tank when I put the injector cleaner in.

later :screwy:

It could be exhaust manifold or could be piston slap.

It could be exhaust manifold or could be piston slap.

Ya I thought about exhaust. we found a socket on the oxygen sensor that the dealer left last time my son took the car in. that made a knocking noise. I did pull on the exhaust and it don't move.

I also yanked and moved the rods and pistons to see if anything was loose. you can look up at the bottom of the pistons when you pull the pan off.

There was no slop anywhere. not anythng that would make me believe it could make noise.

what would make a rod sounding knock when you are decelerating, certain idle speeds, no load situations?

And I mean it sounds like one rod bearing is bad. That is the knock sound.

thanks

I'm not sure, but if and when you find out I would love to hear about it. More information is always appreciated.

I'm not sure, but if and when you find out I would love to hear about it. More information is always appreciated.

I will definately post my findings.

I did a search on engine knock and found some interesting posts.

Thanks if you have anything

I will definately post my findings.

I did a search on engine knock and found some interesting posts.

Thanks if you have anything


hey fngboy, wow sounds like you have checked just about everything, i am a tech at a chrysler dealer, and had a car with a knock similiar to yours, i chased that stupid noise for weeks (just like you , to no avail), ........but one day found the problem (by accident, and then i called engineering and they couldn't believe it iether), this is a long shot, but coudn't hurt to try....with the car running have a friend hold the idle up a bit to where the knock is the loudest, then while they are doing this slightly loosen off the two top bellhousing bolts, and see if the noise changes, like i said it's a long shot, but in my case the bolts where not torqued properly, the casting is fairly thin there at number 4 cyl, and it can distort the cylinder slightly giving you some piston slap., i hope this helps, it may not, but it worked for me.give it a try, it only tales a few minutes , a buddy, and a 18mm wrench !lol

good luck

OK WE FOUND THE KNOCKING NOISE!!!!!!:rofl:

Here is what happened. My son's friend is in automechanic school. His teacher is a Mopar tech or used to be. At anyrate he figured it was something with the tranny just by what we told him. Well he put it up on the houst and listened with the stethescope and it was the flywheel bolts 2 were loose 1 was almost all the way out and it was hitting, rounded over. So they tightened them back up and torqued them and check the other ones. Done fixed the problem they will never come loose again. $20 he charged my son.

Never seen this before. But at least it was good news.

thanks everyone on the sight. It is definately a learning process. I hope this helps anyone with knocking noises. It is easy to check. You just move the cover out of the way and turn the engine over until the bolts are exposed.

thanks again