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Truck nearly stalls while starting - hot startup

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troverman

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Today is a warm day, about 88 degrees. Truck is a 2022 RAM 2500 crew cab 4x4 Hemi with about 1300 miles on it. Cold start is fine, engine starts up strong. But with the engine fully warmed up, an attempt to start it results in the truck cranking, catching weakly…then just about stalling before catching again and weakly working into a normal idle. It did it twice in a row today, and it has done it in the past although this is the hottest day since I bought the truck in March.

I’m already dealing with exceptionally spongy brakes which the dealer told me is normal. I really dislike the squeaky exhaust ticky sound when cold although I do believe that is normal for these. Now I have an engine which seems to not like to start well when hot. And the AC isn’t very good. I prefer the RAM styling but I’m really starting to regret not getting a Ford 7.3L truck.

Thoughts on the engine starting poorly?
 
I don’t have anything to offer (yet), but I’m picking up my new 2500 with Hemi this weekend. I’ll let you know if I run into any of these issues.


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troverman said:
Today is a warm day, about 88 degrees. Truck is a 2022 RAM 2500 crew cab 4x4 Hemi with about 1300 miles on it. Cold start is fine, engine starts up strong. But with the engine fully warmed up, an attempt to start it results in the truck cranking, catching weakly…then just about stalling before catching again and weakly working into a normal idle. It did it twice in a row today, and it has done it in the past although this is the hottest day since I bought the truck in March.

I’m already dealing with exceptionally spongy brakes which the dealer told me is normal. I really dislike the squeaky exhaust ticky sound when cold although I do believe that is normal for these. Now I have an engine which seems to not like to start well when hot. And the AC isn’t very good. I prefer the RAM styling but I’m really starting to regret not getting a Ford 7.3L truck.

Thoughts on the engine starting poorly?
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Greetings,
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jetrinka said:
Not normal at all - I'd be looking for another dealer or tagging @RamCares about the problem. My 6.4 has almost 14k on it now and has never had any issues starting hot or cold. Not something I've heard of on these forums as being a "normal" problem either.
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Thank you for the tag!

Rob
Ram Cares
 
The truck did it to me once again, but it might be hard to replicate. I'm going to try to catch it on video before I go to the dealer, or they will just tell me there's nothing wrong with the truck. I understand its hard to fix what isn't broken.
 
I’ve noticed with mine after it’s hot, shut off and then restarted after it has set for about 10-15 minutes sometimes it doesn’t want to take the fuel. It feels like it lurches for a few minutes and then smoothes out. Kinda like a diesel does when it has air in the fuel system.
 
Mine does the same. Driving from about 4500ft elevation and letting the truck sit at about 8500ft for about an hour or 2. Come back to the truck to start it and its like there is a miss fire or very slow to fire up.
 
Vapor Lock. Can happen with any vehicle when sitting hot for a bit and then trying to start.
 
Vapor lock doesn’t occur on fuel injected vehicles. As an aside, mine seems to be doing it less now that the engine has a few more miles on it. But it will still do it once in awhile
 
Oh well, My wifes Infiniti is doing it and it's FI. Then it must be something else...
 
Quick googling says that VL usually affects carb engines but FI can also experience VL.
 
With a modern engine it would be quite hard to achieve vapor lock, I think. My guess on these Hemis is the various feedback sensors on the engine are not quick enough during a warm engine start to give the ECU perfect info and it results in the sloppy start
 
MEGA HO 3500 said:
Quick googling says that VL usually affects carb engines but FI can also experience VL.
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Yes but thats TBI not MPFI usually…

Usually if a MPFI vehicle is doing this its typically a bad coolant temp sensor or IAT where it thinks its colder than it is and is adding more fuel than needed a good way to check if you dont have any scan tools is if it trys to start like crap hold the throttle to the floor and see if that helps
 
H3LZSN1P3R said:
Yes but thats TBI not MPFI usually…

Usually if a MPFI vehicle is doing this its typically a bad coolant temp sensor or IAT where it thinks its colder than it is and is adding more fuel than needed a good way to check if you dont have any scan tools is if it trys to start like crap hold the throttle to the floor and see if that helps
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I have a code reader but it throws no codes. It is 3.5L v6 Nissan engine, starts after half a crank, RPMs go up and then drop down low and it dies. Does it sometimes and only when it's hot and been sitting for like 5-10 min. Subsequent restarts will get it struggling to fire up unless I give it some gas when starting, definitely not pedal to the floor but just partial throttle. Almost feels like it's out of fuel. I always thought it was a vapor lock and didn't worry about it. I guess I've got to do some digging.
 
MEGA HO 3500 said:
I have a code reader but it throws no codes. It is 3.5L v6 Nissan engine, starts after half a crank, RPMs go up and then drop down low and it dies. Does it sometimes and only when it's hot and been sitting for like 5-10 min. Subsequent restarts will get it struggling to fire up unless I give it some gas when starting, definitely not pedal to the floor but just partial throttle. Almost feels like it's out of fuel. I always thought it was a vapor lock and didn't worry about it. I guess I've got to do some digging.
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Still sounds like over fueling that one sounds like a real head scratcher for sure
 
Maybe an injector not completely closing but not causing a misfire? I had an S-10 with a bad injector that would leak down every time it was shut off but didn’t miss. Found it by the smell of gasoline when turning it off hot. Ran like a top.
Maybe getting air in the fuel rail?
 
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