did you check the simple stuff? Fan clutch? A/C compressor?
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did you check the simple stuff? Fan clutch? A/C compressor?
Quote:
Originally Posted by aggieblazer07
Nooooooo, you cant just put in a new engine without finding out what's wrong with it. we'll never know if we were right or not. plus, the fact that the engine beat you will eat at your heart and soul for all of eternity. be a man and find the problem, fix it if its cheap, then put a new engine in it. not only beat it but master it like the beast master you are. muuhahahaha
ahem, ok, your recent observations tell me that its more likely an exhaust leak. trust me, they usually dont sound like exhaust leaks. they have more of a mechanical sound
accelerating rpm= open throttle more air flowing through the engine and increased dynamic compression ratio results in higher cylinder pressure and intensifies the exhaust leak.
steady state rpm= still lots of air flowing, same result but not as severe
decreasing rpm= closed throttle, less air, etc. etc.
check your oil for coolant and your coolant for oil. if none in either it could still be a blown head gasket, just not by a coolant or oil passage. could be between the cylinder and outside.
scout guys always give me guff over putting a chevy engine in mine. this is yet another example of how a chevy powerplant is good for 300,000 miles as well.
If any of ya'll want to listen to it I can come by and we can go for a ride in it. It's hard to explain the sound with words.
i concurr with agjohn....exhaust leaks sound exactly like a lifter knocking when the engine is under a load...they are variable with RPM and not speed...and you wont be able to hear then very easily when slowing down. the ol' tube to the ear trick is very easily and will allow you to pinpoint where it is coming from.
if you decide to replace the engine and use the same exhaust system, you will more then likely still hear the same noise....unless it is coming from where the exhaust manifold/header mates to the block
it is not worth replacing the engine for such a noise. you should only do somethign like that when it leaks 6 quarts a week or has a whole in the side of it or something of the like.
It only leaks about a quart and a half a week. I crawled under the truck and couldn't hear any exhaust leaks.
just remembered, my dad had a similar problem, thought he had major problems. asked me about it and i took a look. ended up costing $20, including labor, to replace the donut gasket between the manifold and exhaust.
I'll check that
you not gonna be able to hear them very easily while the engine is not under a load. you are gonna haveto get a piece of tube and check the exhaust...or if it is a auto, you can have someone sit in it...putit in gear with their foot on the brake and revthe engine up some....they will be more apparent thenQuote:
Originally Posted by aggieblazer07
would an exhaust leak cause the check engine light to come on?
generally not
now that your computer's throwing codes, take it to Autozone and have them read the codes for you.
do they charge for it?
they shouldnt...but depending on the year model and where the leak is i think it could throw a code....if it is a big enough leak the O2 sensors might not be getting correct readings....Quote:
Originally Posted by aggieblazer07
as ugly said...go to Vatozone and have them check the codes for you. then come back and tell us what they said...
The codes were 32 and 43. 32 is the EGR code and 43 is a knock sensor error. Someone suggested that the pin connecting the piston to the connecting rods could be going out. Any new ideas?
a worn wristpin would definately make click click sounds and trip the knock sensor. is the engine way short on power? if it detects a knock it will retard the timing and kill the power. i know the pre-vortec 350's arent known for their output, but i think you would notice it. not sure how the egr works on those motors. i think its something like the old stovepipe off the manifold and enters the air cleaner housing. that could be a bad valve in the cleaner housing but not whats causing the noises.
an exhaust leak can cause the comp to throw o2 sensor codes because it will scavenge atmospheric air through the leaky spot and make the o2 think the engine is running lean. it would fatten up the mixture and hurt gas mileage and power.
what about flattened lobe on the cam?