Help With Motor Issue...

[sick69]

90-120 on a high milage engine is normal,,,low but normal
finding a set of reman heads may not be a bad plan, can be done in the truck and can be done for roughly 250 - 400 bucks depending on the parts you already have and what you have to buy

[7387chevys]

plugs are fouling out your getting oil into the cylinders from somewhere either valve seals or piston rings by the real low compression I would say rings
Shane

[HotRod73]

take that back, they are wet from fuel looks like... smells like it too...
not only that but i doubt i would have 90-120 on all cylinders except two that are next to eachother i doubt they would have bad rings because wouldnt the rest be low too? i doubt my rings are bad, BUT i could be wrong...

[HotRod73]

did i mention when i step on the gas while driving i can hear a noise like valves chattering or something...
so think it could be something else????

symptoms again:
rough idle.. cylinder 4 and 6 have LOW compression.. when you first take off it shakes like no power then it will catch up and KINDA go a little better, when im driving and i floor it it will make a noise that sounds like the valves chattering or something like that.... so could this be a head gasket or what??? no loss of coolant and no oil or coolant mixed together... when i changed my plugs they did seem fould so MAYBE there could have been oil getting into the cylinder, i kinda doubt my rings are fried, seeing how rest of cylinders have atleast 90-120 and these are right next to eachother maybe my valves are bad or my head is bad?? any ideas????

[7387chevys]

could have busted ring lands on 4-6 .....see if there is gas in the oil if there is you are getting blowby most likely

[Bishops Trucks]

Your motor does not have to overheat to blow a head gasket. Sounds to me that the gasket blew between four and six since the compression is only down on those two cylinders. Your plugs look that way because your truck is not running right. Take the plugs out of 4 and 6, then take an air hose with a spray nossil on it. Stick it in either hole and put your thumb over the other hole, squeeze the trigger and see if you can feel some air on your thumb. If you feel some air, that will tell you that the seal between the 2 cylinders has failed (Blown Headgasket). Good luck.

[7387chevys]

Try that first Its late I need sleep Good Luck
Shane

[HotRod73]

I DO know for a fact, there is no gas in my oil it smells like oil and is brown not black looks clean...when i did compression test and hooked compression tester in #4 i could hear air leak out sounded like... so still could be that, BUT what would cause the sound when im driving and floor it sounds like valves or something chattering... what would that be, ONLY when i gun it...

[HotRod73]

i MAY be wrong but i THOUGHT when i had the compression tester plugged into 4 and 6 and someone spun the motor over i heard air coming from somewhere and didnt hear it on any other cylinders .... i THOUGHT i heard this but could be wrong i will check into that...

[Bishops Trucks]

Your valves sound like that because the 2 cylinders are not getting the proper detonation because the compression is off on 4 and 6. Everything inside the motor has to function together to run and sound right. If the head gasket is blown between 4 and 6 , they are working against each other on the intake and compression strokes. If you have a plug out and turn the motor over you will here air come out because that is the compression stroke. That is normal.

[HotRod73]

okay wow you've been great help so far, you have good points and ideas thank you i will test tomorrow and let you know thanks!!

[HotRod73]

i saw this stuff at autozone i think it was made by bars leaks maybe? its called head gasket repair, it fixes head gaskets and cracked heads its like $10 bux is it worth trying or better to just replace gasket??

[Bishops Trucks]

Never rig! Pull the head and replace the gasket. If it were me I would go ahead and replace both head gaskets since I had it down that far.

[HotRod73]

Okay... Good thinking... I'am just hoping it is my head gasket and not a cracked head or something worse...

[Bishops Trucks]

While you have the heads off, have them checked at a machine shop. No since going through all this trouble to find out there where some other issues like burnt valves or the need to shave the heads. Better to fix it now while it is apart.

[trevor3240]

what you also might be looking at is a carcked rings. Does it burn alotte of oil. How many miles are on the engine. And did it sit in storage for any length of time.

[HotRod73]

102k miles and no it doesnt burn a lot of oil.... iits nice and clean and stays same level pretty much does smoke a little when i floor it...

[Bishops Trucks]

You said the plugs were wet with fuel and now you say it smokes a little when you stomp it. You need to adjust the carburator. It is to rich, you need to lean it out some.

[grinch4om]

dude, back to basics, don't over think this. It has a dead hole by desription, issolate that hole, does it have fuel, air, spark, compression. If you don't have compression, looses rockers till valves are closed(or spin over till TDC on that hole) then put air
to that cylinder, air out carb, intake valve burnt, air out exhaust, exhaust valve burnt, air out oil fill or pcv hole, rings or piston problem. Take appropriate action to your findings.

[HotRod73]

that i do know, i know it runs rich... i havent adjusted the carb yet dont know how... kinda dumb lol

[Bishops Trucks]

Go to your carb makers website and download the manuel for your model of carb. It will have detaled instructions on how to adjust it. The instructions will get you to factory specs for the carb and then you just make little adjustments from that point until it is right. Just remember if you get it to lean you can burn a hole in your pistons.

[grinch4om]

a carburator will not cause only 2 holes to be rich. By manifold design it will effect 4 holes or all holes. refer to my previous post

[Bishops Trucks]

Well grinch4om,
I wasn't saying that and this isn't my first rodeo. I know what a rich carb will do and how it affects the cylinders and nowhere did I say anything about just the two cylinders with the compression issue being the only two having gas fouled plugs. Merry Christmas and Happy New Year!
P.S.
He said it has 2 dead cylinders.

[grinch4om]

cool man, not pointing fingers or criticising, I've seen alot of guys go off and chase their tales, just trying to help and if I offended you, I apologize and Merry Christmas to you!

[grinch4om]

tails