And of course you guys were right, 4L80E but what is this pan?
I don't think it's stock.
Unless later models got this?
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L18 8.1L swap resource thread
- Thread starter Larry
- Start date
And of course you guys were right, 4L80E but what is this pan?
I don't think it's stock.
Unless later models got this?
Mine always had a slight tick and it also had 297k on it. I suppose it was a lifter as it was pretty bad on first fire for about 5 seconds.
Yeah, this one has 267k
I will look for a tag or something.
I parked it at my job site for now so I don't get to mess with it at home yet
It should be a 4L85-E, which started in '02 or '03 and this was one of the platforms for it. AFAIK, the 4L80-E and 4L85-E share the same case, so you'd have to find the tag. It's not a sure thing because some 8.1L trucks came with 4L80-E. The differences are basically different planetary gears and some say an additional clutch plate in 1 or 2 of the clutches. This moved the torque rating from 440 to 460ft-lb, not to be confused with the rebranded from "Hydra-matic" to "SuperMatic" 4L85-E, which was rated as high as 690 ft-lb. (If you're searching). I'm not sure what's different internally, but GM underrated the '80 and '85 to begin with.
FWIW, my 4L80 has the recessed drain plug, as do both of my 4L60's (although I'm pretty sure one of those came with no plug, so I drilled the hole and added it).
FWIW, my 4L80 has the recessed drain plug, as do both of my 4L60's (although I'm pretty sure one of those came with no plug, so I drilled the hole and added it).
I was thinking the same thing. WAY too loud to be a lifter imo.
So at least getting the valve covers off and checking things out
Broken spring ?
The 8.1 valvetrain is non-adjustable so keep that in mind. Valvetrain issues are not too common on 8.1's but with 200k miles really anything is possible.
This is my 6.0 litre harness, turned into custom 8.1 litre, stand alone harness. What a bunch of work that was.
Had to buy these little spark plug wire heat boot things, the wires were/ laying directly on the the header tube. Boots are good to 1200°, supposedly.
I did a PCV mod, because I heard about the intake-oil consumption issue these 8.1's have. EGR delete, PVC addition.
This problem,
Had to turn into this, as the throttle linkage had no room to move. Ended up, cutting, turning 45°, reattaching the oil fill tube to gain clearance for the linkage.
So you closed off the EGR tube under the intake?
In my Suburban build thread I laid out all the connector and wiring details for how I turned a 6.0L harness to an 8.1L harness. Not too hard, but as they say, "the devil's in the details". Certainly not lengthen a few wires and drive like Raylar says. https://ck5.com/forums/threads/quadrasteer-8-1l-suburban-tow-rig.339146/post-4074447
and https://ck5.com/forums/threads/quadrasteer-8-1l-suburban-tow-rig.339146/post-4076868
In my Suburban build thread I laid out all the connector and wiring details for how I turned a 6.0L harness to an 8.1L harness. Not too hard, but as they say, "the devil's in the details". Certainly not lengthen a few wires and drive like Raylar says. https://ck5.com/forums/threads/quadrasteer-8-1l-suburban-tow-rig.339146/post-4074447
and https://ck5.com/forums/threads/quadrasteer-8-1l-suburban-tow-rig.339146/post-4076868
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Yeah, it was not for timid, that was for sure.
The EGR was deleted, it's just another port in the manifold, so, I used it to let PCV fumes into the manifold, via, intake vacuum
I pulled mine apart, chasing, what I was told was a "valve train noise", by the PO.
Turned out have a couple of cam lobes going flat, the #3 and #5 intakes, as I remember.
So, new cam, Lifters, ect.
So far it looks like it is quiet until the engine warms up and the oil thins out.
I haven't opened it up yet but trying to check different conditions and note the changes.
There is definitely something wrong because there's a little miss, but that is most likely the cam position sensor not working properly as per the codes
