Motor shakes

Heres the prob: 2002 5.3liter with 94,000 miles on it, starts fine-engine is noisy due to lack of oil lubrication on initial start up. but mine is a little extra noisy. seems to idle fine, sometimes lopes a little bit. when i give it little gas and hold it(about 800-900rpms) the engine shakes like crazy-vibrates the whole body. above 1000rpms shaking goes away. ive heard about cam lobes getting worn, but i am not sure that this is the problem. this engine has had much abuse, but always the finest maintainance(Mobile 1 full synthetic every 3000 miles religiously, fuel filter every oil change, new plugs and wires,etc).
Any help will be extremely appreciated. I would love to continue going to the track, but i do not know if i am just doing further damage to an exsisting problem.

Ignition or injector problem...my 2 cents

injector would be my guess.

huh.... i would have never guessed injectors or ignition...shows how much i know:lol:

It doesnt like you. Just my 2 cents. :spit:

Quote:

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Originally Posted by ff_jeff

It doesnt like you. Just my 2 cents. :spit:

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hey, my truck loves me:melissa:

ttt

Yeah--sounds like a fuel issue to me as well. No CEL for KR?

Dave, you could take the injectors and fuel rail off and soak them in some warm water and mineral salts for 1/2 a day. Then use low pressure water to hose them out. Or you can send the injectors off to have them disassembled and cleaned. If you do so, make sure to get some new o-rings for the injectors.

Cam lobes rarely ever go bad in a hyd roller set up. Read the spark plugs to see if you have any lean or rich cylinders. Might run some fuel system cleaner and it wouldn't hurt to swap the inline filter if you haven't done so in a while.

when i did the cam swap on my truck, i put in new injectors at the same time, and before the swap i had the same shake. When i took my fuel rails off, i noticed that the FPR screen had a hole in it, so as far as i know something was in there because it was a decent sized break in the screen.

FYI you cant buy the screen seperately :(

Hope that helps a little.