Stock 01 6.0 Liter Valve Rattle

Printable View

01-31-2005, 05:24 PM
SixliterHD

What could be causing this?

Im using 93 octane gas.

Its feeling like its straining to go anywhere.

The fuel filter and air filter has just been changed. It has 70,000 miles on it.

It also has a knock when I 1st crank it up Im using Castrol 20/50 in it.

Did I just buy a lemon? or is this a common problem and easily fixed?

I have been seeing this Lucas Oil Treatment is it any good. I really dont want a "snake oil" that covers the sound Id like to fix the problem.

Im wanting to get a tune but I want to fix the bugs 1st.

Thanks for the help
01-31-2005, 05:31 PM
rckrzy1

you bought a Knockerado, do a search for CSK cold start knock.
Also 20/50 ? I don't think I'd go that route at all. The factory
calls for 5-30 you know.
01-31-2005, 05:46 PM
SixliterHD

Thanks man. Im thinking about going with Mobil 1 just not sure what vis to use. Any ideas?
01-31-2005, 08:18 PM
Hit Man X

At 85K I don't have CSK. I run M1 in mine, 5W30. I have since about 37K mi or so. Before M1 I ran Valvoline.

20W50 seems a bit thick. I'd run that if your oil pressure was low or it was always hot. Also a thinner oil, will equal a bit more power and economy.

Here's a few things to try:

1. Change the PCV. It's like $3. The PCV sys on the Gen IIIs for lack of a better term sucks. I change mine all the time. Oil gets into it rather easily and gums it up. Every 5K to 10K max I'd change it. Again, it's $3 and will take maybe 5 min to swap.

2. Run a can or two of some Top Engine Cleaner through your truck. GM makes it, Ford has some, or the over the counter SeaFoam works too. Chances are there's LOTS of crap build up in the chambers. Most of it is oil from the PCV system as it sucks it back into the intake tract then into where air is supposed to flow.
01-31-2005, 09:00 PM
00stepsyde

where is the pcv on these motors I have 64k and have never changed it.
02-01-2005, 09:19 PM
Hit Man X

Quote:

Originally posted by 00stepsyde@Jan 31 2005, 09:00 PM
where is the pcv on these motors I have 64k and have never changed it.

:eek: It's on the drivers valve cover by the firewall. It's got a big vac line from the intake manifold to the PCV to it. :hshake:
02-02-2005, 12:44 PM
SixliterHD

Will a faulty PCV valve cause it to feel sluggish and like its just not wanting to go anywhere unless Im at WOT?
02-02-2005, 04:04 PM
Hit Man X

Quote:

Originally posted by silverado5.3@Feb 2 2005, 12:44 PM
Will a faulty PCV valve cause it to feel sluggish and like its just not wanting to go anywhere unless Im at WOT?

I don't think so. It's job is to allow the crankcase to breathe.
02-02-2005, 06:12 PM
RedHeartbeat

Damn, my post disappeared. Sounds like maybe you have a plugged cat. I don't know how you could test it short of just remove and replace. If you have sensors before and after and both sensors are enabled in the PCM setup, the PCM should diagnose it's efficiency for you.
02-02-2005, 08:39 PM
SixliterHD

I know its to help the crankcase breath. but im thinking that if its not breathing its not alowing it to spin up properly

So how can I see the efficency in my PCM
02-02-2005, 08:48 PM
RedHeartbeat

If you have a stock PCM and your cats are not working properly it will output an error/service engine soon light. If your PCM has been modified and the rear 02 sensor has been disabled you will not get the SES light. Also, if you have an 02 simulator installed in the rear sensor you will not get an SES light if the cat is defective. I believe the way it works with the PCM is the 02 sensor reads the 02 levels before and after the cat and compares the two. If they are the same, the PCM will turn on the SES code for a defective cat. I am not sure if it will show a plugged cat.
02-03-2005, 09:42 AM
SixliterHD

Well as far as I know the truck it totally stock. I just bought it.

Im thinking about putting a new exhaust instead of just the muffler and changing the cat too.

Im supposed to be working outside of Quero Tx so Im probably going to go to San Antonio a day or so early and get allen to tune my truck . Im hoping that will fix some of my problem.

Im offshore right now so when I get in im going to change my pcv valve for sure.

Any ideas for a good cat if I decide to go that way?
02-03-2005, 02:37 PM
Hit Man X

I run CarSound cats for aftermarkets.... performancepeddler.com is the place for inexpensive ones.
02-03-2005, 03:44 PM
SixliterHD

Cool man thanks. Did it make your truck louder? or are they just like stock cats.

I really dont want ot have a drone in the cab,
02-03-2005, 03:48 PM
Hit Man X

Quote:

Originally posted by silverado5.3@Feb 3 2005, 03:44 PM
Cool man thanks. Did it make your truck louder? or are they just like stock cats.

I really dont want ot have a drone in the cab,

Well the two I put on one car I replaced for a pair of highflows from MAC performance... theirs lasted about 4K mi from MAC. So it didn't get any louder with them there.

When I put them on the F150 yeah it got louder but the stock cat setup was very poor and restrictive. That being said, I'd just expect it to get back to stock loudness on the newer trucks. Stock cats that aren't dead flow very well.
02-03-2005, 08:41 PM
SixliterHD

Cool deal i want something that works long term not just 4k miles. Hell Ill burn that up in 2 months. Im thinking about going with the magnaflow cat and muffler.

Thanks for yalls help.

Now to figure out when I can get down to San Antonio to get this thing tuned.

It will happen soon.

I havent heard anybody not happy with a Nelson tune so far. Im probably going to do something like a 93 hot tune since I run premium anyway.