HS 1.7's, temp sensor and PCV questions
 

For those with roller rockers, are yours noisy?
I've always heard a rhythmic "tsk tsk tsk tsk" in the cab with the windows up when the engine is running on mine and a few other Rams and I'm not sure what it is.
I've always assumed it was either the injectors (they fire with the same rhythm when I put a stethoscope on them), the exhaust valves opening or the rocker arms.
After installing the HS 1.7's the noise is a little louder.
It doesn't sound like a rattle or like anything is wrong, I'm just wanting to know what the noise is.
If you don't know what I'm talking about then I can try to get it on camera if my camera can pick it up over the exhaust.


For those that have changed the coolant temp sensor, what made you change it and did it affect performance?
I know that if it is off then your temperature will read wrong and you'll run either lean or rich, but I have no CEL and I think it might be a good idea to change it.
My temp seems like it reads pretty low compared to what it used to read when I was getting 13-14mpg all the time.

For the PCV gurus, Mine lets a good little bit of oil come through it and it whistles at idle. I've had 3 different ones in the past few months and they all whistle at idle and it's kind of aggravating. Would a Mopar PCV valve do the same or should I just get another one from the parts store?
Also, how much would a screwey PCV valve affect performance?

go with a dealer PCV, some of the part store models are pretty cheap and can rattle.

might want to recheck the torque on those rockers, just to be sure.

Do you think they could have lost some torque? I quadruple checked the torque on them when I installed them. I bet I turned the crank over 50 times.

The noise is the same now after a couple hundred miles as it was when I first started it up.

Also, the noise is almost identical to what it used to sound like, just a little louder with the roller rockers compared to the stock rocker arms. That is why I'm thinking it is the exhaust valves opening since they open a little further now.

Mine make a little noise too, I've heard others say the same thing, nothing to worry about.

Some PCV valves do whistle audibly even when good, and all whistle audibly if you pull them out of the valve cover with the engine running. They never entirely block off the air stream, they just severely restrict it when manifold vacuum is high -- that's why they whistle. All that said, if you're seeing a lot of oil getting past yours, you either have a bad valve or way too much blow-by.

A failed PCV valve will hammer your performance every bit as badly if not worse than a blown plenum. When the valve sticks open it's a vacuum leak with crankcase oil on the upstream side of it, just like a blown plenum gasket. Leave either to go too long and you'll be kissing your catalytic converter goodbye, and may end up with stretched valve stems, too. The oil settles out of the intake stream onto the valve stems and bakes onto them, building up a little bit more with every mile, until the chunks of crud start hitting the bottoms of the valve guides. Then you've got bad valves and guides, too, all for a part that costs less than a double shot at the bar.

Do you have any idea how much oil is too much oil?

When I changed my intake manifold, the old one had enough oil in there to get the plenum pan wet but not puddle up and that was about 3000 miles or so after replacing the plenum gasket.

I remember someone that installed a catch can a while back saying that they get about a teaspoon worth between oil changes in it.

Man, my PCV valve lets in oil all the time. I've replaced it three or four times after I noticed it, with different brands each time, and it still lets in oil.

By the way, I did replace one of my coolant temp sensors. I can't remember whether it was the one for the gauge or for the PCM. I think it was the PCM. But your sensor does both. I broke mine in half removing it for the Air Gap, so I don't know what difference it could have made.

I say just replace it, they're cheap, fragile, and they could stop your engine from going into open loop I'm sure. And they're a pain to get to when everything else's in place.

mine makes the same noise after I installed them.. I triple checked them.. heard the noise and check them again!! all tight to spec..

I have that tick too, but no roller rockers.

I was told that it's just worn lifters.

pcfixerpro installed that oil catch.