Engine knock/tic

[jakeb2011]

Hey guys, I was running my talon a little hard then i got this nasty sound from the motor. It would stall after every time i put in the clutch until it made a terrible grind noise and wouldn't start up again. So i towed it home and it runs again but the sound comes back as soon as you get it above about 2 and a half grand and then it stays til you let it cool.

Only mod I know about on the engine is a different turbo. Have only had the car a couple months so I'm still figuring it out. I checked everything on the accessory belt for extra resistance but that not it. Any suggestions on diagnosis?

 

[bcracecar]

Sounds like a spun rod bearing to me... Post up a video.

 

[asianandy87]

Could be spun bearing, or could be crankwalk. very rare but it happens.
Check leaks and check for collapsed lifters, or take out plugs and shine a light down and check for marks on the pistons. or disconnect the battery and trun the head by hand and listen or see f it will smack the pistons then post back on here,

 

[jimbecker3]

It really sounds like a spun bearing

 

[jakeb2011]

Hey guys, sorry for the long time to respond but I'm also a full time college student and can only work in my dsm on the weekends which is now in my basement to be torn apart and diagnosed. I turned it by hand and nothing hit and felt smooth, checked the spark plugs and it was running pretty rich but that doesn't seem like it could be the problem.

Seems like everyone thinks its a spun rod bearing, if so I probably have to pull the motor don't I?
I have lots of time this week so any more suggestions I can try immediately .

 

[kleenf4i]

check the timing. I know this is basic, but check the oil. A spun rod bearing sometimes will still be able to be turned by hand with ease so, I wouldnt rule it out. The only weird thing about this is its not doing it immediatly. Typically a bad bearing will start loud and get louder. Yes you will have to pull the motor if its the rod bearing.Well, technically you dont HAVE to pull the motor, but its much easier.

 

[undefined0000]

Sound similar to this?

Spun Rod Bearing 4G63 turbocharged engine. - YouTube

I used it as a reference when it turns out I just had an exhuast leak

 

[kleenf4i]

an exhaust leak wouldnt make the car die.

 

[undefined0000]

I was mostly worried about the noise. It was a loud ticking/slapping sound.
I'm not saying he has an exhaust leak, just saying that video was a good reference.

 

[kleenf4i]

I understand. Surprisingly that noise at idle does sound like a rod knock. I hope that may be all thats wrong, but again, it wouldnt kill the car.

 

[undefined0000]

Here's what I had going on:

DSM Ticking/Exhaust Leak - YouTube

This is what makes it so hard to identify problems by word, even still by sound over the internet.

 

[Cdc1221]

I had a spun rod bearing AND a crack in the mani same time. Talk about double whammy. But a bad enough exhaust leak pre-o2 sensor could potentially lean it out enough to die at idle

 

[undefined0000]

That must've been pretty noisy! Never understood why exhaust leaks are so clacky. I would imagine them to be more explosive . How do you even manage to spin a rod bearing? Isn't that from taking the motor out of its normal rpm range? He did say he was driving it hard too..

 

[kleenf4i]

This is what makes it so hard to identify problems by word, even still by sound over the internet.

100% agree with this

 

[jakeb2011]

Yea I feel terrible about running 6 grand for maybe about a second but the motor didn't seem the strongest to begin with. It was down on power and on boost. I'm pretty sure my buddys GS is way faster. Anyway that's not the point. I just wanna fix it and with the lack of space from the pic below you could see how I am not looking forward to trying to lift the motor. Do you guys know of any ghetto ways of lifting a motor?

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[kleenf4i]

How do you even manage to spin a rod bearing? Isn't that from taking the motor out of its normal rpm range? too..

Almost always, its from not having enough oil between the rod bearing and crank journal. There are tons of reasons this could happen, alot of different combonations and scenerio's. usually spun bearings are found right after a rebuild if the bearings werent lubed enough.Ive seen this happen way too many times, Ive done it myself on one of my rebuilds.

 

[undefined0000]

Yea I feel terrible about running 6 grand for maybe about a second but the motor didn't seem the strongest to begin with. It was down on power and on boost. I'm pretty sure my buddys GS is way faster. Anyway that's not the point. I just wanna fix it and with the lack of space from the pic below you could see how I am not looking forward to trying to lift the motor. Do you guys know of any ghetto ways of lifting a motor?

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That's a better situation than what I'm in. I've got no garage . You should have enough room to lift the motor normally

Almost always, its from not having enough oil between the rod bearing and crank journal. There are tons of reasons this could happen, alot of different combonations and scenerio's. usually spun bearings are found right after a rebuild if the bearings werent lubed enough.Ive seen this happen way too many times, Ive done it myself on one of my rebuilds.

Makes sense. So as long as oil level and health is maintained, along with mild to no motor abuse, you shouldn't spin a rod bearing?

 

[kleenf4i]

Do you guys know of any ghetto ways of lifting a motor?

QUOTE]

Dive through the hood, im sure they will have it out in no time, then call the cops and get your parts back. Thats the easiest way I can think of. J/J You can do the rebuild while the motor is inthe car, its just a pain because your constantly up and down. You could rent a hoist once your down to the last bolts to pull it out. You then need a motor stand. I would say if you dont have access or the room to huse a hoist and engine stand, just do it in the car. Only thing that sucks about this, is if you have to do any work to the block itself. Or if your having to put a new crank in. Believe me its near impossible to put a crank in while on your back. I would rebuild it in the car if it were piston rings and rod bearings. but anything beyond that will be a nightmare to do without the motor out.

Makes sense. So as long as oil level and health is maintained, along with mild to no motor abuse, you shouldn't spin a rod bearing?

Correct. The other factor is oil pressure. I HIGHLY recomment getting an aftermarket "mechanical" oil press. gauge. It could save your motor. The one on the cluster really is garbage.