Recall = M1 0w-40

[rdezs]

GM is notorious for changing things in the middle of a model year...

 

[Charlie207]

GM is notorious for changing things in the middle of a model year...

But that's not the case here.

 

[opfor2]

Now I just wish they would do a recall on their stupid AFM/DOD crap

 

[j91z28d1]

I still need someone to explain to me how checking for a code about crank/cam mismatch signal shows if your engine will rod knock and lock up.

is there an issue with the vvt setup causing oil pressure issues to the rods?

I'm baffled

 

[rdezs]

You can replace the camshaft sensor and or the crankshaft sensor in the engine should still start. You do a relearn so the ECM has the exact positions for them. If the camshaft sensor doesn't drive with the crankshaft sensor, usually it will fail to start on the first turn of the key, but on the second attempt it will usually start right up.
Never heard of an issue with the VVT affecting oil pressure to the rods. The VVT is typically very reliable.
Nothing about it would make the engine lock up. Only getting the initial timing off would do that.

 

[j91z28d1]

You can replace the camshaft sensor and or the crankshaft sensor in the engine should still start. You do a relearn so the ECM has the exact positions for them. If the camshaft sensor doesn't drive with the crankshaft sensor, usually it will fail to start on the first turn of the key, but on the second attempt it will usually start right up.
Never heard of an issue with the VVT affecting oil pressure to the rods. The VVT is typically very reliable.
Nothing about it would make the engine lock up. Only getting the initial timing off would do that.

then why is gm using a mismatch signal to deicide if an engine gets replaced on not? and the failure of these engines if I'm seeing it right is the bottom ends locks up. gm is saying connecting rod manufacturing fault but to check for cam code, not inspect the rods.

as for vvt I have read a few different places that vvt uses more oil volume to operate than afm does. my only thought was it's the only thing that can change the signal timing between cam and crank sensor, short of a bad sensor, but these are brand new low mileage engines. and there's no talk of replacing sensors or running a case learn. if code is present, you get a new engine. if code isn't you get thicker oil.

I guess it's possible gm has screwed up this whole recall and will end up putting new engines in tkem all. but weird.

 

[rdezs]

The VVT is limited on how far it can move the cam.... I think there's more going on here than they are admitting to as of yet.

 

[donjetman]

They'll probably REVISE the recall 10 times before we hear the end of it, like they do their TSBs. Like TSB# 10-06-01-008 "M"

 

[Just Fishing]

My wrangler calls of 20w oil, newer ones still do as well.

The 3.8 in my jeep is known for spinning rod bearings.
And guess what i bought it with?
A spun bearing!

Seems like most loose it at about 200-230k.
Not that bad, but still.

I don't trust 20w oil, especially with my tahoe experience and thrust bearings.

That wasn't the oils fault, it was a combo of machine shop doing a shit job, aftermarket comverter, and me adding a couple percent to the converter lockup pressure.

Issues fixed with a brand new crank, and i lowered the converter lockup pressures under what it was stock.

I'm still running 15w40, i had the best results running that while the crankshaft kept trying to escape from the front of the engine.