‘06 Hemi cuts out/stumbles at highway speed

john p f · Mar 15, 2018

It’s a split second. Almost feels like hitting a bad seem in the highway time wise. My truck is an 2006. Should be after the valve spring issue? But has mds. My second thought after changing plugs was changing the transmission fluid and filters. I put in ATF +4, not sure if the previous owners ever used Dextron. I do use the 5W 20 for the mds. Could be a lockup converter going south but that transmission was almost as clean as new inside. I’ve heard if you get the wrong fluid in them they act up. My Jeep manual says only use dextron for emergencies and then flush the system later. I thought that was interesting. The atf +4 smells, feels and costs different. I’ll keep you posted.
Thanks

Jbaker33 · Mar 15, 2018

john p f said:
It’s a split second. Almost feels like hitting a bad seem in the highway time wise. My truck is an 2006. Should be after the valve spring issue? But has mds. My second thought after changing plugs was changing the transmission fluid and filters. I put in ATF +4, not sure if the previous owners ever used Dextron. I do use the 5W 20 for the mds. Could be a lockup converter going south but that transmission was almost as clean as new inside. I’ve heard if you get the wrong fluid in them they act up. My Jeep manual says only use dextron for emergencies and then flush the system later. I thought that was interesting. The atf +4 smells, feels and costs different. I’ll keep you posted.
Thanks

I have an 06 as well. QC 4X4. I've actually read of ppl still having issues with the springs in 06, sometimes 07 as well as valve seats falling out if the motor gets too hot. Another thing you may want to check is your timing chain. The tensioners are plastic and break cause catostropic failure when the chain brakes. I'm pretty sure something like that happened to my wife's Chrysler last year. I wasn't as much into cars as I am now, otherwise I would have looked at it myself and tried to see how bad the damage was. I know they said bent valves. That's part of the reason I want to get another motor and rebuild it. Upgrade all of parts that are known to fail, clean and paint it and then install it in my truck. Did you see my post in this section?

Jbaker33 · Mar 16, 2018

I forgot to ask, what type of exhaust do you have? Like aftermarket or stock with resonators and everything? I'm driving mind right now and now that I'm paying attention, when MDS kicks in when you're going faster than like 40 mph, it does make it sound like a driveshaft clunk. I heard it and thought "what the hell, I just changes those this fall" lol. It wouldn't hurt to take another look at your u joints tho. I'm going to when I get home. I'm actually going to put the rear on jackstands and figure out a way to secure my phone under my truck to record it and then put it in drive. Maybe hit the throttle a little bit, maybe find out what's clunking. I also have a pretty vibrations from 45 on up, getting worse with speed, which could be the driveshaft itself.

When I did the u joints I marked it and everything but I ended up torching it off trying to get the bolts loosened (northern Michigan rust..)

john p f · Mar 16, 2018

I have original exhaust. I wouldn’t mind upgrading some day. I understand that the Hemi is a great engine to build. I hear upgrade the springs and rods. And camshaft upgrade makes a huge increase in horse power

john p f · Mar 16, 2018

It cut out again today. But I turned on the tow haul and it has not cut out again, so far. Try this for a week to verify. I think it’s stopped it though. Probably the MDS hitting hard. I’ll Keep you updated.

john p f · Mar 16, 2018

It’s still cutting out with the tow haul on. Real bummer. Driving back home tonight into the wind in tow haul it cut out pretty rough about 50 Times. I checked the fuel pressure on the new pump just to make sure and it’s good. Probably transmission/torque converter or electrical related to the two I’m guessing. Possibly the lock up converter hammering in and out or maybe the transmission going into 2 gears at a time for a fraction of a second.
Any history of this on other Dodge Rams?
I’m going to check PCM connections and transmission connections.

john p f · Mar 16, 2018

Strong fuel pressure when pulling into the garage after cutting out

john p f · Mar 16, 2018

Here it is cutting out majorly. The sound is different than in real life but telling something. The ‘rattlesnake’ sound is deep in real life but this was picked up by the iPhone. What the heck is it??? I think it’s a crazy malfunction of the solenoids in the transmission and the clutches or lockup converter grabbing. I think it’s grabbing 2 gears at once for a split second.

john p f · Mar 17, 2018

Just a quick recap

It’s not spark plugs, MDS, fuel pump (which was week), TPS/throttle body, rear differential, or wheel bearing (which was scary bad). Also never a trouble code.

This may be transmission related. Still don’t know.
Perhaps solenoid replacement?

john p f · Mar 17, 2018

I checked PCM connections and they were dry as a popcorn fart. I lubed them up with dielectric grease worked them a little and reconnected. I saw this on another topic here. I think it was a TSB.
I doubt it fixes it but I will update. Going out for a road trip. Hopefully it breaks down if nothing else.

john p f · Mar 17, 2018

PCM plugs lubed up with dielectric grease did NOT help. Cut outs/stumbled again today. Shot in the dark admittedly. Maybe time to take it to a Dodge dealer with a good diagnostic and transmission technicians. Maybe it’s something common?

john p f · Mar 18, 2018

Drove it in OD off and it still does it.

john p f · Mar 18, 2018

Rattle in gear 35mph on jack stands about 3rd or 4th gear no throttle after running 60mph. No rattle in park at idle or rpm. Rattle goes away in gear at 60mph.

Anyone know what the rattle is???

john p f · Mar 18, 2018

What’s the rattle??
Leaning heavily towards a transmission replacement or possibly a solenoid problem. I reposted under transmission problem? To hopefully catch a transmission expert.

john p f · Mar 20, 2018

Truck is at Dodge dealership shop for diagnostics. They are having a fun time figuring it out. It did it for their diagnostics technician and he got no conclusive data as to why. He’s going to basic mechanics to figure it out now putting on “chassis ears”. Several microphones put on the engine, transmission, differential etc to figure out where for sure the problem is emitting from.

Good idea.

john p f · Mar 21, 2018

Dealership says it’s a transmission or torque converter but are very perplexed that it is not throwing a code of any kind or giving any data hints.
I bought a used transmission with warranty.

john p f · Mar 23, 2018

I hope that dealership is right. Kind of my suspicion too. Anyhow transmission is ready to come out in the morning.

john p f · Mar 24, 2018

Replaced transmission and torque converter as dealership thought it was a bad transmission, torque converter or transmission problem. Test drove it, still the same damn issue, cuts out at cruising speed when thoroughly warmed up, never down hill. I am beginning to hate this truck. Looks like I need to sell it, drive 3 hours to a better shop or start diagnostics myself. Maybe just replace every sensor one at a time.

john p f · Mar 24, 2018

12.9 volts DC on the battery vehicle shut off after hour drive. I heard people say a week battery can cause this. It’s a nearly new battery.
Catalytic converters looked great inside.

john p f · Mar 25, 2018

What are the better scanner adapters and apps for iPhone?

‘06 Hemi cuts out/stumbles at highway speed

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