Ban1dit

iTrader: (1)

My car just started acting like it was missing one day. I had over revved the car previously and thought that it might be the problem. So I pulled the heads inspected the lifters and cam. They were fine. Put new heads on and so forth. When I fired it back up, it still did it. Not throwing codes or anything. Feels way down on power. My question is, does the rod bearing just go all at once or can it go slowly? It is not insane bad, just noticeable. I have a feeling that it just started. I can post a vid if necessary, but prefer not to drive the car if avoidable.

Thanks,

SSdreamz

iTrader: (3)

like anything else it can wear out slowly. mine on the other hand gave no indication what so ever that the engine was about to puke the #7 rod bearing. i was sitting at a traffic light waiting for it to turn green, just idleing...then when i went to pull out ( very gently and slowly) it started a loud knocking noise and the oil pressure dropped

Ban1dit

iTrader: (1)

It happened when I was on the freeway. I just tried to speed up from 65 to 70 and it started doing it. It is not a knocking. Just a good stumbling. I just dont want to take it in for all this diagnosis and they tell me that I have a spun rod bearing. Which I already would have known.

NC98Z

iTrader: (1)

Rod bearing failures sound like a knock coming from under the intake manifold. You lose oil pressure big time and can see the metal in your oil.

Wesmanw02

iTrader: (4)

You'll know if you have a spun road bearing. Its not a stumble, its a definite bottom end knock. If your engine isn't knocking at all and your oil pressure is normal, its very unlikely that you spun a rod bearing.

Is your Service Engine Soon light on??

SS101

iTrader: (2)

did you check the pushrods when you had the heads off?

overrev + stumbling sounds like a few bent pushrods to me

ss69

iTrader: (8)

x2 that's what I'd check

Wesmanw02

iTrader: (4)

Exactly. Roll the pushrods accross a piece of glass (glass table for example) and see if they wobble as they roll.

Ban1dit

iTrader: (1)

It's not the pushrods. I replaced them when I put the new heads on.

gsxr1k2

iTrader: (6)

You will have a loud knock and could also have a bit of a squeal with a spun rod bearing. Though an way easy to check is to pull your oil filter and pour it out on a rag in your hand and if it looks like you struck gold your fucked.

bjamick

iTrader: (31)

If you have spun a bearing you will most likely have a drop in oil pressure, the engine will make a horrendous knock in the bottom end. Did you check the lifters while you had the heads off also?

Ban1dit

iTrader: (1)

The oil pressure seems good. It is above 40 lbs. I pulled the lifters and they looked good also.

V6 Bird

iTrader: (15)

You might have an actual bent rod. I have a car sitting here with that same noise you described. I was initially chasing a lifter bleed down issue. Almost put it back together to see if the motor would spin free and it hangs up in one spot. Tore the motor down to find #6 rod looking like my dick. had a slight curve to it. HAHA

Ban1dit

iTrader: (1)

Could this happen over time? Or is it an all at once deal?

bjamick

iTrader: (31)

Nope a rod just wont bend over time. usually it happens when an engine hydrolocks or gets some water into the cylinder by popped head gasket or something like that. I have heard of it happening that a motor has not lost oil pressure even though it had spun a bearing. Sounds like this issue here, something is knocking so I would pull it apart now that the block is salvageable.

Ban1dit

iTrader: (1)

Is there anyway it could be a cam position sensor, crank position sensor, etc.???

Ban1dit

iTrader: (1)

Bump. Any thoughts????

bjamick

iTrader: (31)

If its not throwing a code most likely its something mechanical.

slmdLS1

iTrader: (8)

i have a video of my rod bearing failure ill see if i can find later. it was down on power, and i couldnt hear the squeal over the dual cutouts. oil pressure dropped but came back.

below was the carnage...