RAM 1500 5.7 HEMI – Misfire on cylinders 3 and 5 after camshaft and lifter replacement

[EdGs]

Does anyone have a diagram showing the correct installation layout for the MDS lifters on the 5.7 HEMI?

If anyone has a diagram or reference showing the correct placement of MDS lifters vs standard lifters, I would really appreciate it.

Thanks.

This is the best image I have (not mine)

OE MDS Lifters:

OE Non-MDS Lifters:

 

[hakas19rus]

Good evening everyone,

I have some new details.

Now the scanner shows misfires on cylinders 1, 2, and 7.
One important detail — the misfire appears only when the engine is hot. When the engine is cold there are no misfire codes.

The VVT solenoid (oil control valve) has also been replaced, but it did not change the situation.

I would appreciate any ideas or suggestions.

Thanks.

 

[EdGs]

Any other codes?

So you only have a P0301, P0302, and P0307?

 

[hakas19rus]

Any other codes?

So you only have a P0301, P0302, and P0307?

Hello everyone,

Here are the latest fault codes from today.

The scanner shows the following errors:

P0301 – Misfire detected in cylinder 1
P0300 – Random / multiple cylinder misfire detected
P1524 – Engine oil pressure out of range – camshaft advance/retard disabled

One important detail: the misfire appears when the engine is hot. When the engine is cold there are usually no misfire codes.

The VVT solenoid has already been replaced, but the problem remains.

Has anyone experienced something similar on a 5.7 HEMI?

Any advice would be greatly appreciated.

Thanks.

 

[hakas19rus]

Hello everyone,
I have some new updates.
I disassembled the engine and removed the cylinder heads.
During inspection I found the following issues.
I am attaching photos — please take a look and share your opinion.

I would like to understand:

is this normal condition or not

• could this be the cause of my problem
• what should be done in this situation

Any advice or suggestions would be greatly appreciated.





Thanks.

 

[EdGs]

I have heard with the OE MDS lifters that the pins don't have to line up with those holes, but I am not sure on that.

Hopefully somebody else will chime in.

Can you post a link with what brand these lifters actually are?

 

[Ken226]

I have heard with the OE MDS lifters that the pins don't have to line up with those holes, but I am not sure on that.

Hopefully somebody else will chime in.

Can you post a link with what brand these lifters actually are?

You are correct. The MDS pins in those pics are normal.

 

[hakas19rus]

Hello everyone,

I have an update.

Regarding the lifters — I found something interesting.

On the aftermarket (Chinese) lifters I used, there are two retaining rings on the back side, and inside the lifter there are three springs controlling the internal plunger movement.

The issue I found was that the internal plunger in these lifters was not moving freely — it was bottoming out against the retaining rings and not extending fully.

What I did:

I took the original OEM lifters (the ones that had seized), disassembled them, and installed the OEM internal components (springs and internals) into the aftermarket lifter bodies.

After doing that:

• the plunger now moves freely
• no longer bottoms out against the retaining rings

After reassembly:

• the engine starts and runs
• power is restored
• the engine now pulls нормально

However:

• the fault code is still present

So it seems like the lifter issue was part of the problem, but not the whole issue.

Any thoughts on what could still be causing the remaining code?

Thanks.

 

[hakas19rus]

You are correct. The MDS pins in those pics are normal.

TorquelNova

TorquelNova-Home

www.amazon.com

 

[hakas19rus]

I have heard with the OE MDS lifters that the pins don't have to line up with those holes, but I am not sure on that.

Hopefully somebody else will chime in.

Can you post a link with what brand these lifters actually are?

TorquelNova

TorquelNova-Home

www.amazon.com

 

[Ken226]

TorquelNova

TorquelNova-Home

www.amazon.com

Good luck.

For me, there is too much labor involved to risk having to repeat the work and re-purchase parts, to risk using parts of unknown provenance.

I understand your position though. Given your location, it might be tough to source quality parts. If I couldn't get OEM parts, I'd perhaps try lifters from CompCams or Johnson, or try to find a way to get some imported.

To be honest though, I hate these kinda fights. I'd probably just get rid of it and buy something that I could maintain locally.

 

[04fxdwgi]

TorquelNova

TorquelNova-Home

www.amazon.com

Chinesium. They may be OK, but who knows for sure with all the fake positive reviews they pay the bots to insert.

 

[EdGs]

@hakas19rus, Which code(s) do you still have?

 

[jws123]

Your going to be re doing this job again because you didnt use good lifters best of luck.

 

[EdGs]

Your going to be re doing this job again because you didnt use good lifters best of luck.

I worry about the quality/grind of the cam, too.

 

[hakas19rus]

Good luck.

For me, there is too much labor involved to risk having to repeat the work and re-purchase parts, to risk using parts of unknown provenance.

I understand your position though. Given your location, it might be tough to source quality parts. If I couldn't get OEM parts, I'd perhaps try lifters from CompCams or Johnson, or try to find a way to get some imported.

To be honest though, I hate these kinda fights. I'd probably just get rid of it and buy something that I could maintain locally.

Thanks for your input, I completely understand your point.


Yes, the amount of labor involved is significant, and repeating all this work is definitely something I want to avoid.


Unfortunately, due to my location (Guatemala), access to OEM parts is limited, so I had to work with what was available.


After disassembling the engine, I did find issues with the lifters, so that was definitely part of the problem.


At this point my goal is to correct everything properly and eliminate all possible causes so I don’t have to go through this again.


I will also try to source better quality options like CompCams or Johnson if possible.


Thanks again for the advice.

 

[hakas19rus]

@hakas19rus, Which code(s) do you still have?

P0307 – misfire in cylinder 7

 

[hakas19rus]

I worry about the quality/grind of the cam, too.

Thanks for the input — I’ve been thinking about the camshaft as well.


After tearing the engine down again and removing the heads and lifters, I inspected the camshaft through the lifter bores. Visually, it looks good — no obvious signs of wear or damage.


Also, the engine has only run about 400 km since the rebuild.


The lifters themselves now appear to be in good condition. The main issue I found was that the internal plunger in the aftermarket lifters did not have full travel and was bottoming out against the retaining rings.


So, in the end, I ended up with a bit of an “engineering hybrid” — aftermarket lifter bodies with OEM internals. After that, the engine started running properly, power is back, and the truck drives as it should.


At this point, I’m left with just one remaining issue — a misfire on cylinder 7.


To be honest, after going through all of this, I’m starting to understand why some people just say “sell it”


So… I did. It’s already listed for sale.

 

[EdGs]

I would try the original mds solenoids if you still have them.

Those Chinesium parts are what caused/are causing you the most grief, IMO.

After what you've been through, it seems you are so close to having it fixed.

 

[Wild one]

Thanks for your input, I completely understand your point.


Yes, the amount of labor involved is significant, and repeating all this work is definitely something I want to avoid.


Unfortunately, due to my location (Guatemala), access to OEM parts is limited, so I had to work with what was available.


After disassembling the engine, I did find issues with the lifters, so that was definitely part of the problem.


At this point my goal is to correct everything properly and eliminate all possible causes so I don’t have to go through this again.


I will also try to source better quality options like CompCams or Johnson if possible.


Thanks again for the advice.

Don't buy Comps lifters,they have a terrible rep in a Hemi.Order a set of OEM lifters and wait for them,you'll be farther ahead then trying to mickey mouse it together with garbage after market parts.