well we all know that i jsut bought a suburban and am in the process of fixing it up so i can use it to tow my TT. I drove it back to Mo. for Tx. and it seems to drive fine. when i changed the oil i used mbl 1 15000 mile oil and also put the $12 Mbl 1 filter. It makes a little noise for less than 2 seconds when i start it up but than goes away. It seems to run better with the mbl 1 than when i brought it up from Tx. It just has the start up noise. is this ok. It sounds like lifter noise. but what do i know.
its a filter with a check valve to keep all the oil from draining out of the filter when the engine shuts down. usually they are used on filters that are in the sideways position, horizontal.
not used in this system normally, because the filter is vertical, up and down.
just a idea, he was asking about noise at startup, the ford 300 streight 6 cyl. they are famous for rapping at start up because of this. sorry had a senior moment!
I talked to a mechanic last night and he said the 454's get carbon build up around the top of the cyl walls and the pistons touching this at start up is what makes the noise. he said GM has a liquid that you put in thru the FI after the filter. he said you take off a small hose and put it in untill the engine dies than let it sit. that will make it go away. any one hear of this?
Ok this is wierd, you all know this is a truck i just bought. when i bought it it did not make the engine noise. I put in the new mbl1 oil and it made the noise at start up. well it stoped making the noise at start up. no more noise.
If it is a new engine and it sounds like a diesel for a bit, it is proably the piston design. GM went to skirt-less pistons with the 5.3/6.0/8.1 LT engines in 2000. After break in they get louder. When I'm in sub-zero it knocks for about 5 minutes so I just lay off the throttle until everything gets up to temperature, then it is nice & quiet. I have a 2001 K1500 with 106k - it runs fine and sounds like a can of marbles at start up.
almost all high mileage engines will suffer from knock on start-up. Build up on the lifters allows them to leak down when the engine is cold and it usually takes a few seconds to pressurize at start up. the 7.4 seems to be more suceptible to this than most engines. As stated carbon build up is a problem on GM B/B's also.
Two methods I learned to combat this problem were as mentioned Seafoam through a vacuum port into the intake manifold. And a few ounces of ATF into the oil about 500 miles before oil change.
Seafoam knocks down carbon deposits and cleans the intake runners, ATF revitalizes the lifter seals and cleans built up deposits from them.
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