how does the MDS on a Ram 1500 with a 5.7 Hemi work?

10

Asked by sully196 Nov 26, 2014 at 01:19 PM about the 2007 Dodge RAM 1500 SLT Quad Cab 4WD

Question type: Maintenance & Repair

Had my motor rebuilt, and it was running great I took it to a dealer just to have it checked out and was told I had a bad coil pack, they replaced it and when I was driving home the truck developed a miss so I took it back to the dealer now they tell me they did a leak down test and I have a bad cylinder . I was wondering if the mds can have something to do with the miss?

3 Answers

30,490

mds works by closing all the valves to a cylinder and shutting off the fuel to it as well. if they did a leakdown test, you will have to ask them what they mean by bad cylinder. It could be rings, or either intake or exhaust valves, there is even a possibility of a head gasket failure. I am guessing that they think it is rings. if you recently had a rebuild, it is possible that they didn't seat in that cyl. I am sorry that I dont know for sure how mds is tested, but I would guess that the dealer would do some kind of a Live data scan while driving. hope this helps.

1 people found this helpful.
10

The dealer told me it could be the rings or I spun a valve. I never heard the term spun valve, I thought the valves turn, that's why you seat your valves. .At an idle it feels like I have a miss, but when I accelerate it runs fine until I hit about 50 mph then I get a hard vibration out of the motor. When I hit the passing gear it starts to go like a bat out of hell then I lose power

1 people found this helpful.
30,490

I think its time to take it back wherever it got rebuilt. bummer. hope it is under warranty. btw, i have never heard of a spun valve either. spun bearing, but not valve. oh well. live and learn. sounds expensive. really sorry.

1 people found this helpful.

Your Answer:

RAM 1500

Looking for a Used RAM 1500 in your area?

CarGurus has 82 nationwide RAM 1500 listings starting at $4,000.

Postal Code:

CarGurus Experts

  • #1
    Dan Connell
    Reputation
    20,220
  • #2
    dandyoun
    Reputation
    15,280
  • #3
    Gene Arnett
    Reputation
    11,760
View All

Find great deals from top-rated dealers

Search

Related Models For Sale

Used Ford F-150
296 Great Deals out of 15,534 listings starting at $1,712
Used Chevrolet Silverado 1500
212 Great Deals out of 5,925 listings starting at $3,995
Used GMC Sierra 1500
126 Great Deals out of 6,796 listings starting at $3,975
Used Dodge RAM 2500
25 listings starting at $4,000
Used Toyota Tundra
46 Great Deals out of 1,128 listings starting at $5,999
Used Dodge Charger
41 Great Deals out of 602 listings starting at $4,888
Used Toyota Tacoma
53 Great Deals out of 1,029 listings starting at $8,708
Used Dodge Durango
45 Great Deals out of 2,288 listings starting at $5,500
Used Dodge Challenger
23 Great Deals out of 474 listings starting at $5,999
Used Jeep Grand Cherokee
109 Great Deals out of 3,274 listings starting at $4,995
Used Chevrolet Silverado 2500HD
16 Great Deals out of 1,149 listings starting at $8,999
Used Jeep Wrangler
144 Great Deals out of 5,075 listings starting at $6,995
Used Ford F-250 Super Duty
28 Great Deals out of 1,155 listings starting at $8,995

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use. Content will be removed if CarGurus becomes aware that it violates our policies.