Ok guys i have a 99 chevrolet suburban k1500 with the 5.7 and 4 wheel drive with the auto 4 option. Now the other day i was driving and after i took off i noticed i didnt have very well acceleration and i noticed a knocking noise coming from what sounds like center of motor.. It hasnt thrown any codes other then one for my fuel pressure sensor and it starts knocking once the motor warms up and u rev it to around 2k rpm.. any advice would be helpful. Thank you in advance..

 

can you post a video of this "knock" ???

if it sounds like a stone randomly tossing around inside your motor - it's probably a rod bearing.

At any rate - Are you going to try to at least fix the fuel pressure issue? Or just ignore it some more?

 

I caan post a video after work todat and the fuel pressure sensor was recently havent had time to drop the tank to switch it out

 

Also i pulled valve covers and oil is going up to the rockers and none of the rods look bent and it sounds like someone is knocking on a sokid steel door but again ill try to post a video when i get home.

 

Heres a cideo i foumd exact same problem as me 1999 GMC Suburban 350 motor knocking: http://youtu.be/IeBsSDaTTsM

 

http://m.youtube.com/watch?v=IeBsSDaTTsM&feature=youtu.be

 

That is a spun bearing. Sorry, while it is fixable, best bet is complete rebuild or engine replacement. I just went through this same thing with my 99 K1500 pickup with 5.7.


If you opt to replace, make sure you get a 5.7 from a 96-02 and hear it run before you buy. 5.7's that are older than 96 will not work in your truck.

 

What makes ur say spun bearing and also it has like no low end acceleration i heard possibly torque converter fail due to in park rev constant at 2k

 

I'm not just some Youtube arm chair tech adviser spewing some random terminal failure, I've been there done that. I'll upload and post the vid that was recorded from my truck. It'll it'll take a while because it is on my wife's phone never the less, Same sound.

If the sound from the vid you posted is in fact the same sound you have in your truck it is definitely not torque converter, I changed nothing with the transmission, I still have the same original equipment from torque converter back, the sound is in the engine, I can guarantee that.

Yeah, I know, changing and/or rebuilding engines is a daunting concept to process but in the long run this is the cheapest solution. Yes, you could probably get away with just a bottom end rebuild but you mix new parts with old parts, old parts break. Trying to "fix just what is broke" at this point in your vehicles life will result in the vehicle Nickle and dimeing you to death. Because you replace one worn part it will work properly which has the side effect of increased the stress on the remaining worn parts. Before long those worn parts fail, before you know it you have done a partial bottom end rebuild eight times in the last 5000 miles, or you have done a complete bottom end rebuild but now less than 3000 miles later you have to do a complete top end rebuild. After that internal rebuild and before you know it you have dropped 2500 to 4000 dollars or more over the course of 10000 miles.

She is an older truck, on a very popular platform. $500 will get you a rebuild kit on amazon, after that you are probably looking at labor cost so possibly in the ball park of $1500 to $2000 on the low end but you'll be good for another 200000 miles or until the body craps out or it gets wrecked.

Or depending on your location, you could find a good running parts truck for $500 to $1000, rip the motor (and maybe even the fuel pump) out of that drop it in and see how long it lasts. after getting what you need out of it take the parts truck to the scrap yard for $300 rebate. That is what I did, I bought a beautifully running truck that had a terminal case of cancer for $700.

 

This is the sound my truck was making when I finally broke down and replaced the engine.