5.7L truck engine help

[supa_c 5,000+ posts]

well my burb has a knock in the engine.

it was diagnosed as a rod problem.

i was told i will need a new engine !!!

or put in 50w oil for now and eventually get a new engine

if it is where is the cheapest place to get a 5.7L burb engine. jegs, summit..... or pick a part? i have very little money to spend

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[nick_05 10+ year member]

im sure you could find a wrecked silverado, burb, hoe, and take the 5.7 out of it

 

[DaBaller504 10+ year member]

Yes, a 350 is a very common engine. I am sure you can find one.

 

[Johnny Drama 5,000+ posts]

Advanced auto parts I had a '94 that i blew up. They are about 850-900 depending where u live.

 

[PV Audio 5,000+ posts]

just jack one from a yard.

 

[DeepMag1c 10+ year member]

hah someone else feels my pain !! this happened to me last month...im ordering my engine from advanced auto parts tommorrow !! I let the oil run and I threw a rod that went straight threw the oil pan. Im getting the "tough one" engine..it comes with new everything. If you can ask the guy to give u a deal. I got the manager to go as $1000 with it. And may I add that I have the cleanest 88 burban ever !

 

[InhumanAcura 5,000+ posts]

I think you blew the most common internal combustion engine on the face of planet Earth. You could most-likely drive out to the nearest trailer "community" and get one out of someones front yard.

 

[supa_c 5,000+ posts]

my problem is cost. $2200 used installed from my mechanic.

$3200 new/installed from him.

labour is $$ in California so im tryin to find a cheap junker

i am going from So Cal to idaho so i dont want a lemon.//content.invisioncic.com/y282845/emoticons/uhoh.gif.c07307dd22ee7e63e22fc8e9c614d1fd.gif

 

[helotaxi 5,000+ posts]

Describe the problem. What gas are you running? Runing too low an octane will cause problems such as a knock. That is all higher octane is really good for, reducing/eliminating preignition. Let go too long you could bend or break a conrod or push rod. Mistimed spark and/or a cam out of adjustment could have similar effects. Unless you have really trashed the block, you should be able to get your current engine rebuilt, or use it as a core exchange at the very least, for much less than the quote you were given. Shop around. It is a really common engine so finding another on shouldn't be a problem, but I doubt it would really come to that. Get a second or third opinion on what the problem really is befor you spend any money on a replacement. It could well be that your mechanic is feeding you a line.

 

[Berry47 10+ year member]

We sell them at autozone.

I just pull an LT1 or LS1 out of a late model camero, and make it mount up. Tranny bolts should be the same not sure though.

 

[davidfre21 5,000+ posts]

We sell them at autozone.
I just pull an LT1 or LS1 out of a late model camero, and make it mount up. Tranny bolts should be the same not sure though.

probly an LS1... vette engine

 

[supa_c 5,000+ posts]

87 octane is what i use. the oil pressure drops to about 10psi and lower at stop lights. the engine has 150K. . the engine has electronic timing so it cant be adjusted. it sounds like a diesel, thats how loud it is. money is very tight so a block is what im aiming at. the problem was evident when i put in synthetic oil. from the regular. the previous owners did some damage to it so i dont think its my fault.

 

[Johnny Drama 5,000+ posts]

A small block chevy only needs 7 psi to run correctly. My 94 ran at 7-10 at idle and 40 when going

 

[supa_c 5,000+ posts]

the check gauges light comes on at stops. and rattles back and forth. it doesno go up to 40 while driving. like 20-25.

 

[helotaxi 5,000+ posts]

Try higher octane gas before you do anything else. I had an older truck with a 350 and it wouldn't run for **** on anything less than 89 and like 91+ much better. The difference in price per gallon was more than made up for by the difference in gas mileage. Running more expensive gas would still be cheaper over the course of several years than replacing the engine if it fixes the problem.

 

[Johnny Drama 5,000+ posts]

I would go get a second look. Your timing could be off. Even though its electronic its still timeable. You have to unplug the computer timing wire under the glovebox. time it then plug it back in. 20-25 psi is ok.

Did you change any of the sparkplugs or wires recently?

 

[supa_c 5,000+ posts]

nope. i dont think its the timing. it was running fine before. just this past 2 weeks its gone down the drain. the check gauges light comes on because the oil pressure is in the red and the truck starts to shake. is your premium $2.60 a gallon. how would plugs make a knock?. it isnt a quiet knock either. it is loud enough to be heard a 1/2 block away.

im gonna try the preimum since the tank is low on fuel. prob wont help but worth a try.

 

[helotaxi 5,000+ posts]

If is sounds like a diesel, it is probably dieseling. Possible causes are predetonation from too low an octane fuel or a fouled plug not firing until the cylinder is basically vapour lock and then firing. If the latter is the case, you need to fix it ASAP or you will do damage. The former will cause damage over time.

 

[supa_c 5,000+ posts]

it goes away when the revs are up at 1k.

ill try to get the plug out but its in there. stupid headers!

87 octane has been fine since i had it, but you never know? my dada wants to know since he's gonna be dishin out the $$. the lower $$ the better. it some times shifts at 3500 and makes this bone jarring rattling that is like a whirring rattle (like a rev up and down). other times it shifts at 2K woth no rattle. ill be back in a while gonna check the plug(s). any more ideas would be appreciated.

 

[supa_c 5,000+ posts]

well i took out the plugs and managed to break one. had to drive on 7 cyls to get another. $6.99 for 1 freakn plug. i got the cheap o ones!. im gonna see if i can get my engine rebuilt, it will prob be cheaper. need to take to a mechanic with a stethoscope to see what cyl it is.