Not sure that has anything to do with Covid supply issues. Would like to see Ford go to the AAM 11.5 though.........

 

My month old 2022 RV with a 2021 ford chassis and Godzilla engine failed as well at 6800miles.
For those of you with this engine in your RV or truck here is how you will know yours has this known defect;
You will start throwing a CEL for multiple cylinder misfires and ford will misdiagnose it and send you on your way until it eventually throws a rod through the block.

Here is how mine went down:
Just by chance I put my code reader on it because of a gas cap loose alert on dash. Gas cap wasn't loose so just wanted to see if I could reset the code and the prompt would go away. When I pulled the codes it had the gas cap code but also and another older "multiple cylinder misfire". The check engine light wasn't on so I thought maybe it was bad gas that caused it. That was at around 5000 miles when I checked it. On my vacation 1500 miles later (July 12th 2021)we were coming out of the hills from Mount Rushmore and it started throwing a CEL light. I was 5 miles outside Gillette Wyoming so I drove straight into the ford dealer there. They don't have lifts for this size of vehicle so they sent me to their medium duty truck center, interstate power systems to change the plug wires because they were known to get bad batches on this new engine causing the same issue which was "multiple cylinder misfire". It also created an audible tick so they changed the plugs as well which it went away after that. The mechanic said if it starts having issues again to request they change out the coil pack because Gillette ford didn't have any in stock. Since this caused us two days we just canceled our trip to Yellowstone and headed back to Texas going through Denver because the Rush truck center there should have all the parts we would ever need if we have any more issues. About 70 miles outside of Denver we started getting the check engine light again. Headed for the next exit going down a steep incline that's when we heard a sound like dragging chains and the engine cut off. When they towed it to the ford dealer the mechanics said it had a visible hole in the side of the engine.

After two weeks of Ford fighting with Rush truck centers who handles there contract for medium duty trucks they finally agreed to tow it there. Unknown to me when it got there it was in line with 8 other RV's that have the same issue,,, So over four months later I only have 3 more in front of me until mine gets worked on which should be around Jan 2022 according to the Ford rep. Purchased the RV new on June 3rd 2021, broke down on July 14th. I'll let everyone know what the mechanics say if I ever get it back..

 

Wford@ford.com

This is Bill Ford's email. Please be concise in your explanation to him. He will get someone on it. He did for me. If you complain it goes nowhere. Best of luck.

 

Sorry to hear of your troubles. While 7.3L failures in Super Duty pickups have been rare, it's starting to look like there are issues with this engine in motorhomes. I am interested to see if there have been problems in the 7.3L Super Duty 650 and 750 trucks yet, but there seems to be so few of them around it's hard to say. In any event, I hope your issue is resolved sooner than next year. I don't know what state you are from, but where I live this would be an easy 'lemon law' case if you wanted out of it. Sure, give Bill Ford a chance but I think you ought to be compensated for your trouble and unavailability of your RV in addition to just getting it fixed.

 

I may be mistaken, but I thought lemon laws did not apply to RV's. Also most people I know who have purchased an RV or motor home during covid have had serious qc issues.

 

makes no sense why RV's would have more failures. Also, it's detuned (less HP) from the truck versions.

 

It doesn't make sense to me either. That's why I am wondering how the 7.3L is doing in the 650 and 750, I would think if the engine is having issues in motorhomes it would be having issues in the larger truck as well.

 

Maybe that's it...the problem is in the tune.

 

Makes sense. A bad tune can do some damage.

 

I wonder if this has anything to do with the stoichiometric combustion Ford highly touted when this engine cane out. From my understanding, stoichiometric equals a maximum safe lean condition. Lean, shouldn't equal thrown rods, but something weird is happening.

Thanks for the updates.

 

Stoichiometric ratio of 14.7:1 is the point that gasoline is most efficiently converted to energy during combustion.

 

Your observations on the lack of break in is really good. Thx, I never thought of that. If I ever get a new motor-home, it will make me want to pick it up from the factory.

 

I wouldn't think so either. Too lean would trigger a 'check engine' light, and if allowed to go on too long I would expect to see burned valves and piston damage.

 

Unless..... the "lean code" is too far below the stoichiometric condition? Trying to squeeze every 1/8th MPG out of the thing. Who knows? I have no doubt it's a great engine, I'm just curious about this failure mode.

 

I guess my January 31 2020 7.3 TREMOR build is immune to the sub-par parts virus then...Now just have to pop in those C type plug wires and hope they're better than the A wire that failed on #2 cylinder around 11k. Likely caused by the long (30 minute) uphill( Mt. Charleston, NV) gradule grade towing(gently, watching rpm and trans temp.)10k after running around town(Vegas, 110 degrees)Only other problem is batteries cooking causing them to boil out a bit. Wonder and doubt Ford will own that one and give me a couple Optima's as replacement. That engine bay must be getting REALLY overheated to cause that and wire failures. Seen a TSB for the F51 motorhome chassis where they cut out baffle next to radiator for xtra air flow. Why there's not same TSB for Super Duty F-Series owners baffles me. Anyhow, I plan to drive this till wheels fall off. So, I expect to drop-in new engine and Trans at some point. Just hoping that won't be for at least 10-15 years and 200-300k from now. Well, that's also if those epa folk don't force us to out of OUR (ICE) full size trucks...😪. Although, I might consider a FREE replacement for a new hydrogen powered one???