Collapsed lifter problem
Thread Starter
Burning Brakes
Joined: Mar 2002
Posts: 1,065
Likes: 41
From: Kensington PE
Collapsed lifter problem
My 16 Stingray had been working bad since I got it 6 months ago. Today my mechanic diagnosed a collapsed lifter on cylinder 7.
I had the AFM [4 cyl mode] disabled a month ago and don't intend to ever use it. What choices do I have in lifter replacement?
I had the AFM [4 cyl mode] disabled a month ago and don't intend to ever use it. What choices do I have in lifter replacement?
Melting Slicks
Joined: Aug 2004
Posts: 2,339
Likes: 483
As mentioned above you can either modify the car and eliminate the system all together or fix it. There really isn't any gray area. The modifying route (done properly and effectively power wise) will be much more expensive. To replace the bad lifter(s) as long as the cam wasn't hurt isn't that big of a job. The driver side is the easier side too. I can do that job in less than 6 hours on the lt1 c7 to give you an idea.
Thread Starter
Burning Brakes
Joined: Mar 2002
Posts: 1,065
Likes: 41
From: Kensington PE
As mentioned above you can either modify the car and eliminate the system all together or fix it. There really isn't any gray area. The modifying route (done properly and effectively power wise) will be much more expensive. To replace the bad lifter(s) as long as the cam wasn't hurt isn't that big of a job. The driver side is the easier side too. I can do that job in less than 6 hours on the lt1 c7 to give you an idea.
Melting Slicks
Joined: Aug 2004
Posts: 2,339
Likes: 483
From what it sounds like you are repairing so you will need 4 afm lifters and 4 regular lifters if only doing the one side. I would suggest factory ones but aftermarket ones are available. I don't know if they are better or not. Whoever is doing the repair should be familiar with what is needed. If they aren't then find someone else.
Thread Starter
Burning Brakes
Joined: Mar 2002
Posts: 1,065
Likes: 41
From: Kensington PE
From what it sounds like you are repairing so you will need 4 afm lifters and 4 regular lifters if only doing the one side. I would suggest factory ones but aftermarket ones are available. I don't know if they are better or not. Whoever is doing the repair should be familiar with what is needed. If they aren't then find someone else.
I think this is the answer I was looking for to set me straight. Our mechanic is familiar, we are replacing all lifters on the drivers side and I will get new OEM lifters.
So even though the AFM [4 cyl mode] has been programmed away, do I still put 4 AFM lifters in their respective holes?
Drifting
Joined: Jun 2021
Posts: 1,409
Likes: 947
Don't be cheap here. DO BOTH SIDES! If the cam is OK leave it alone. CHE makes a great trunion kit, get one since it's only a couple hundies. It would be incredibly foolish to tear it down to remove just the one head on the affected side. Do the DOD delete if you like. I kept my VVT because it makes amazing torque curves.
Melting Slicks
Joined: Aug 2004
Posts: 2,339
Likes: 483
I think this is the answer I was looking for to set me straight. Our mechanic is familiar, we are replacing all lifters on the drivers side and I will get new OEM lifters.
So even though the AFM [4 cyl mode] has been programmed away, do I still put 4 AFM lifters in their respective holes?
So even though the AFM [4 cyl mode] has been programmed away, do I still put 4 AFM lifters in their respective holes?
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Thread Starter
Burning Brakes
Joined: Mar 2002
Posts: 1,065
Likes: 41
From: Kensington PE
Yes, even though deleted you still need to run the afm lifters unless you change the cam as well. I believe the cam lobes are also designed differently based on this system. There was a comment above about doing both sides. The only overlapping time is the fact the intake manifold is removed and the coolant is drained. In my opinion it isn't worth the cost to replace the passenger side. You'll find the afm lifters are pricey and the additional labor will add quite a bit. If that was the actual path I'd probably replace the cam and upgrade at that point.
Melting Slicks
Joined: Aug 2004
Posts: 2,339
Likes: 483
I appreciate your down to earth response. I am a body guy not a mechanic, so I am trying to get my head around all this. So the plan is to replace the AFM lifters on the drivers side. Is there any need to replace the NON-AFM lifters on the same side? My thoughts are that if they generally cause no problems, leave them alone.
Pro
Joined: Mar 2002
Posts: 732
Likes: 138
From: Allen (DFW) Texas
I'm not sure if there's a way to test the solenoids in the LOMA but it would be worth checking that while the engine is opened up. When I had this issue it affected both cylinders 7 and 1, and included a bent push rod on one cylinder, so I replaced all the lifters on both sides as well as the LOMA itself just to be on the safe side.
Thread Starter
Burning Brakes
Joined: Mar 2002
Posts: 1,065
Likes: 41
From: Kensington PE
So we are doing one side and I am ordering parts today.
So I need:
4 AFM lifters
4 regular lifters
Head gasket
Head bolts for 1 side
Does that sound like a complete list of parts?
So I need:
4 AFM lifters
4 regular lifters
Head gasket
Head bolts for 1 side
Does that sound like a complete list of parts?
Safety Car
Joined: Jul 2019
Posts: 3,844
Likes: 1,302
From: nashville TN
exhaust manifold gasket, oil and filter, coolant. blower has to come off so you may lose some coolant there and if the lifter collapsed I would change the oil and filter the old oil and look for metal
Race Director
Joined: Jul 2015
Posts: 16,043
Likes: 2,719
From: Frisco, TX
Op, not sure why you just chose to do one side and not both
Melting Slicks
Joined: Aug 2004
Posts: 2,339
Likes: 483
Probably because it is literally double the work if not more. The passenger side now requires the water pump to also be removed and the fuse box. The intake manifold labor and fluids are the only savings by doing the other side now. It takes 15 minutes to pull the manifold. No real reason to do the other side if just replacing with stock items.
