awesome banging noise

BMFB

BMFB

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I think its my ac clutch, but its hard to spot, tomorrow im going to take the belt off and see if it does it without it, but i got bit of a banging noise, not real metalic, but a distinct extra noise, its weird, and i hear it less as the engine revs, it seems loudest when im in drive not moving. also i dont see any metal in my oil (at least not on the stick) now, i know these engines tick, but anyone ever heard something close to what im talking about?
 
BMFB

BMFB

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Re: awesome banging noise

after listening to it again, it sounds like its a goofy exhaust noise thats coming from my cat, i know it was gutted. My ac compressor is really noisy though, but it still blows cold so i dont know how i feel about removing it. Its not as metallic sounding outside that car, and after i and a few of my buddys listened to it, its not anything to be scared of, engine sounds like a sewing machine tough with everything going, injectors i think
 
S

Static

Member
Re: awesome banging noise

Ive got a banging noise too. Mine is the stock muffler giving out. You can see the bottom of it pulsing and only hear it at idle speed.
 
gkrcr882

gkrcr882

SyTyless......for now!
Re: awesome banging noise

Make sure the torque converter bolts aren't beginning to back out. Happened on my S15, they were beginning to get loose and hit the inspection cover. To see if its the fan clutch/water pump, remove the belt and try wiggling the pulley. I have seen water pumps so bad that the impeller was actually hitting the housing and it sounded like a bad cat. AC compressor will have a distinct high pitched metallic chatter if the clutch is going bad, and there may be metal shavings around it. If the bearings are going it will have a growl or rumbling sound.
 
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syclone0209

Member
Re: awesome banging noise

cut your oil filter open. when my mains started to go it sounded like a little weird dinging noise that wasnt there when driving just when the load changed on the motor like rev up and coming down was a little more. but it wasnt there usually at idle or steady rpm.
 
BMFB

BMFB

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Re: awesome banging noise

ok, so im still looking for this banging noise, and im still pretty sure its not from any of the rod/main bearings, as ive done an oil change with no evidence of metal.

I took it to a garage and like, 6 people came out and looked at it on the spot cause non of them had ever seen a typhoon before. i had 3 people climb underneath it instantly and they started looking for the noise, and 2 on top, while on eof them was asking me about why the laptop was plugged into wires coming out of the dash. Anyway, they concluded that it didn't sound any louder underneath than it did on top, and that it didn't sound like it was coming from the back of the engine where the flexplate was, and that it wasn't a rod bearing because of the way it acted under load. they concluded that it could be a harmonic balancer going out. We also noted that the noise seemed to be in rhythm with the osolation on the belt tensioner, as it was running, it seemed the belt wasn't being spun smoothly across all of the pullys, and that something was out of round. I also noted that it banging got much louder when the ac compressor kicked on and stayed that way until it disengaged. sense then, i have replaced the harmonic balancer, making sure all of the bolts were tight, and it seemed to be good for the first few drives, but the sound has returned. I double checked the bolts and they are still tight. I looked to see if if could be the engine itself banging against something but i cannot find it, it is a very distinct noise, and it can be felt through the floorboards slightly. But it really sounds like its coming fromt he front of the engine. I cannot find the pulley that is out of round to cause the belt to do what it does, and i don't think the tensionor can be causing the noise. It also makes the noise when the belt is off the truck, but not nearly as loudly...im worried something is wrong with my crankshaft, or maybe the sound of the broken flexplate is somehow travailing and being audible through the front (stupid?)

timing set? belt crank pully? bent crank?

point is im out of ideas and was wondering if anyone had any
 
turbomatt

turbomatt

New member
Re: awesome banging noise

same thing happened here. same noise. to confirm put truck in gear with parking brake set or wheel chocked and the a/c on. the only true way to check engine condition is to pull the oil filter (gravy) and cut it open. i do this once every 1500 miles. you get an engine update and also a fresh filter. do not cut the filter with a saw as this will introduce false metal into the filter. i always take it off and take the gasket off and poke a hole in the top with a punch or screwdriver. turn it over and let it drain for a little while. the method i use is to take a punch and make a hole about 3/4 of an inch below where the filter is crimped together. here is the pain unless you buy a filter opener. take a pair of needle nose pliers and insert into the hole and twist (like opening a sardine can). do this all the way around the filter. if you do it right you will have a strip of metal wrapped around the pliers. BE CAREFUL, EVERYTHING WILL BE SHARP. take the spring and retainer plate out as well as the anti-drain back valve. get a knife you hate and cut the pleated paper element away from the cardboard it is glued to. once you do this you will have one big belt of filter media you can unravel for easy inspection. now grab your pen magnet. copper = bearing failure (tri-metal bearings), little black non-magnetic chunks which crumble when crushed are carbon deposits, RTV = DUH, magnetic silver particles = oil pump or rotating assembly, and non-magnetic silver particles are pistons or in some cases bi-metal bearings. this will tell you where to look.
 
BMFB

BMFB

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Re: awesome banging noise

alright horrible news

Took it to a mechanic and had him look at it. He found metal in the oil that i couldn't see using my finger (usually i can tell, but this was faint) It didn't seem to be magnetic, and he said that the noise wasn't consistent with typical rod knock, he said rod knock usually wouldn't make any noise (comparatively) until it was decelerating, and this was doing the opposite. #4 cylinder was dead as idle, but with my 0-60 times, im guessing it has low compression and fires at higher RPM. He said he could feel something loose in the crank when he would turn it by hand, and i felt it as well. His guesses were a bad skirt or a wrist pin on 4, he gave me a compression tester to borrow, and he said to test them all on the even bank, and put a 1/4 extension down the cylinder and wiggle the crank and see if i could feel it loose, although he admitted it could only rule out skirt...

I gotta say im pretty sad, it looks like im going to have to pull the whole motor. Ive done it on other things, but not AWD, im gonna have to look up a write up to get an idea, if i could keep the trans in that seems like it would be the easiest, hell then it might not even be that big of a nightmare. Im also hoping its not the crank, as it looks like the crank is the most expensive part. If i rebuild it i don't think ill go for much more power, as it already seems fast as hell, even with a ****ed up cylinder. Although, i do have it running off of code 59, and could make nearly anything work i believe. I think the tranny is that weak point and ill just maybe toughen up what i do have.

I feel i can do all o the work other than the machining, but i dotn know what parts are gonna cost, bit nervous....

if anyone has any advice on this, id love to hear it,
Im gonna take a nap and wait for it to cool, then go do some investigating
 
BMFB

BMFB

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Re: awesome banging noise

with my nap complete im going to take a shower, and then go out and do a compression test on it, before i rip it out of the truck, i may go to kessels first and buy soem baggies....
 
qbnkiller

qbnkiller

Conflaguration Specialist
Re: awesome banging noise

When I was looking for the source of my noise, I tried several things - pull the serpentine belt (noise still there, but a little quieter), wood dowel/stethoscope all over the motor (no internal engine noise). When I would turn the crankshaft with a wrench or from the flexplate, it would feel weird - like it would turn hard then slip about 20* then get hard again. I was right at the point of pulling the motor when I spent some time with a flashlight and mirror under the truck. With the converter bolted up, you couldnt see anything wrong. Once I unbolted the converter from the flexplate and slid it back (about 2"), I could get more light on the center of the flexplate. I couldn't be 100% sure, but it did look like there were cracks there. Once I got in there completely (slid trans back, unbolt trans, etc), I found the flexplate completely cracked all the way around.

If you have one hole dead and shavings in the oil filter, then you have another issue. I can tell you - when the flexplate was cracked, the whole motor shook violently, was loud, and would quiet up and go away for a little bit. It would get loud under load but also get a little quieter on its own.

Just posting my experience...good luck man!
 
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