Random extended cranking help needed

[XXSNOTRODXX]

Did you ever get your problem sorted out? I have a 2013 and have had an intermittent long cranking issue for quite some time. Seems to be more of an issue with cooler temperatures.

Sorry it took so long to respond. I was on vacation.

No I have yet to figure out what causes it. I can say that it is not related to spark plugs though as I just put 16 new plugs in it yesterday as per the 60,000 mile maintenance schedule and the 2nd start of my truck after having did the install was a "extended crank start".

It has never NOT started for me...but the random extended crank start is enough to worry you on WHEN the day may come that it decides not to start. AND it can be slightly embarrassing. For example, I was at my brother in laws a couple months ago and was picking on his Chevy and how superior my Ram was....get in my truck to leave his drive way and "CRANK CRANK CRANK CRANK CRANK"....I didn't hear the end of that one haha.

I have yet to try a new battery ( I doubt that it is related to the problem because it has plenty of cranking juice....BUT it is the original battery).

Not sure if it could be related to something to do with the tip start/hill start features of the truck,random hiccup with the cam or crank position sensors or what.

Probably 90% of the time it fires up without hesitation and runs great. But other times you turn the key and let go of the key and the tip start feature takes over and continues to crank until the engine starts which can sometimes take around 5 seconds worth of cranking. And normally when that happens it almost "stumbles into running" rather than a "VROOM" when it fires up. (hope you follow what I mean lol).

If you find anything let me know please!

 

[Rupert]

I, and more than a few folks I know have had a similar problem with Chargers and challengers. Usually, but not always the long start is accompanied by some hesitation at some point. The problem is the Camshaft position sensor 90% of the time, and no, there is no accompanying CEL. that's easy to swap and relatively cheap. Next on the list is the Crankshaft position sensor, not expensive, but its behind the starter and PITA to swap out. Not sure exactly where it is on the truck engine.

However you do not report any acceleration hesitation, stumble, so I'm going to suggest the Battery:

A couple times I have had a battery that had enough juice to roll the engine over just fine, yet not enough juice to fire up the PCM/ ECM. 2x on my Harleys and once on my car. Once momentum built up/ starter load dropped, there was enough juice for the PCM to activate.
In all cases replacing the battery completely fixed the issue.
One of my Harleys would just rollover and over, and not start at all. Id let it sit( while I rode my other/ older Harley) for a day and it would fire right up. I figured he battery built up enough chemical electrical capacity after I depleted it to be able to start.

SO quit wasting time and buy a battery. yours is old anyway.

 

[KCaudill]

I had the same problem with another brand. The problem was that the fuel pressure bled off after the car was turned off. The fix was just switching the key to the run position waiting 10 secs then try to start it. Worked every time. Have you tried that yet?

 

[XXSNOTRODXX]

I, and more than a few folks I know have had a similar problem with Chargers and challengers. Usually, but not always the long start is accompanied by some hesitation at some point. The problem is the Camshaft position sensor 90% of the time, and no, there is no accompanying CEL. that's easy to swap and relatively cheap. Next on the list is the Crankshaft position sensor, not expensive, but its behind the starter and PITA to swap out. Not sure exactly where it is on the truck engine.

However you do not report any acceleration hesitation, stumble, so I'm going to suggest the Battery:

A couple times I have had a battery that had enough juice to roll the engine over just fine, yet not enough juice to fire up the PCM/ ECM. 2x on my Harleys and once on my car. Once momentum built up/ starter load dropped, there was enough juice for the PCM to activate.
In all cases replacing the battery completely fixed the issue.
One of my Harleys would just rollover and over, and not start at all. Id let it sit( while I rode my other/ older Harley) for a day and it would fire right up. I figured he battery built up enough chemical electrical capacity after I depleted it to be able to start.

SO quit wasting time and buy a battery. yours is old anyway.

I have not been chasing the problem down hard as I mentioned it is only an intermittent problem. And no, I have no hesitation or stumbling or anything like that. Aside from the times where it has the extended cranking issue ...it doesn't "vroom" start right up after cranking over a few times... It will crank over a few times and then kind of hesitate/stumble to start and then clearsw up and runs fine.

And yes I know the battery is old. It is on my "to get list". I haven't ran right out and got a new one yet because this one checked out ok on my toaster box and the volt gauge sits normal and it has no problem whipping the engine over. I originally started this thread awhile back to see what other ideas people had before I jumped out throwing money at an undiagnosed problem.

My wife has a 5.7 in her Jeep that I had to do both a cam and crank sensor it...neither of which exhibited the same symptoms as I have described with my truck.

But I do agree that one or the other (or both) could be a possibility.

 

[XXSNOTRODXX]

I had the same problem with another brand. The problem was that the fuel pressure bled off after the car was turned off. The fix was just switching the key to the run position waiting 10 secs then try to start it. Worked every time. Have you tried that yet?

It has happened under multiple scenarios. I do not believe that to be the issue. In the last year I have had it do it cold,warm,first start of the day. seconds after shutting the engine off and restarting it. Aswell as leaving the key in the on position for a period of time prior to starting.

what seems to cause it to happen the most is if for example I started the engine, drove a few miles to the gas station,run into the store and right back out and go to fire it up.

warm engine,shortly after shutting engine off is when it most often has this extended crank issue.

 

[KCaudill]

Vapor lock maybe?

 

[XXSNOTRODXX]

Vapor lock maybe?

If it was vapor lock it would have hesitation cranking I would think. It still whips the engine over normal. Just a failure to fire/stumble to start as quickly as at should. And does not do it all the time. Seems like if it was an issue with a leaky injector or something I would have gassy oil,puff of smoke on start up,raw gas smell,check engine light due to 02 readings and also seems like it would be a consistent issue rather than a intermittent issue.

which has me leaning towards as mention a cam or crank sensor possibly, Maybe it randomly shuts off in a position where it gets a weak pick up signal and upon cranking it has no reference to send to the pcm and causes an extended crank.

or possibly as mentioned the battery being older and the pcm lagging to sync up with the cranking.


then again in either of these scenarios I don't see how it would correlate to mostly happening after a short drive,shutting engine off and within a minute or so restarting engine and having the issue.

anyways, its a intermittent issue so I will sit back and see if anyone else has had a similar issue with these trucks and when I am confident on a path to venture down I will tackle the problem. until then there is no sense throwing money at parts trying to fix whatever may be the problem.

But I will be getting a battery regardless being that it is due for a new one.

 

[F.S.F.W]

Did anyone come up with a fix for this? My wife's truck has this issue. Replaced the cam position sensor, and it has a brand new battery.

 

[XXSNOTRODXX]

Did anyone come up with a fix for this? My wife's truck has this issue. Replaced the cam position sensor, and it has a brand new battery.

Still no fix man. I just keep dealing with it until it gets to the point it becomes more of an issue and I can have more luck pin pointing the issue. would still love it if someone would chime in with a remedy though

 

[ab71684]

I have had similar issues in my '11. I replaced the battery and then had issues cranking. I originally thought it was the neutral position switch because it would start in neutral and not park. Then it started working fine. I have had hesitation, then it will randomly fire right up. All this time i never had any codes pop up. I replaced the camshaft position sensor and still having the same issues. I randomly got a code one day and it said the manifold absolute pressure sensor was bad. The next day the code went away on its own and i haven't had any since. I'm about to replace the MAP sensor, but i have my doubts about whether it will help. Next will be the crankshaft position sensor. If that doesn't work its to the dealership to try and get an answer.

 

[XXSNOTRODXX]

I have had similar issues in my '11. I replaced the battery and then had issues cranking. I originally thought it was the neutral position switch because it would start in neutral and not park. Then it started working fine. I have had hesitation, then it will randomly fire right up. All this time i never had any codes pop up. I replaced the camshaft position sensor and still having the same issues. I randomly got a code one day and it said the manifold absolute pressure sensor was bad. The next day the code went away on its own and i haven't had any since. I'm about to replace the MAP sensor, but i have my doubts about whether it will help. Next will be the crankshaft position sensor. If that doesn't work its to the dealership to try and get an answer.

Keep us posted.

Fortunately mine hasn't got to the point where its a frequent issue. Just once and awhile. enough to make you feel like a tool at a gas station when people stare at your shiny newer truck failing to start lol.

I would like to find a fix for it before whatever the issue is gets worse and leaves me stranded. But I refuse to throw money at it hoping for a fix. So I will either wait until someone with a similar issue finds a fix that sounds like it will work for me OR until the problem worsens and is easier to diagnose.

I will however be replacing the battery before winter just out of precaution due to it still having the original battery. If for some reason that fixes the issue then great. But I have doubts that the issue is related to the battery.

 

[Pierce2772]

2015 dodge ram 5.7 hemi.. long crank

Had the battery replaced at the dealership under warranty for an extended crank when tip starting the ignition.. did not adress issue, same problem returned in 3 days although if i leave the key in position 2 (let fuel pressure build up) it starts up after sputtering a bit... i believe the fuel pump has a check valve that holds pressure at fuel rail that may be leaking fuel back into the tank causing the extended crank when the truck has sat for about an hour. Taking it back to the dealer this week. Im hoping it is not a compression issue because i also have noticed a light stumbling when letting foot off break pedal at a stop light, this could also cause a long crank issue if rpm difference between crankshaft and camshafts is off due to a malfunction in camshaft adjusters or low compression.

 

[XCELLR8]

I'll add my truck to this issue. I feel this is a fuel issue, because it acts like it wants to fire and sometimes tries to take off then falls flat back to cranking. It reminds me of trying to start a car with a carb.

 

[RamCares]

Had the battery replaced at the dealership under warranty for an extended crank when tip starting the ignition.. did not adress issue, same problem returned in 3 days although if i leave the key in position 2 (let fuel pressure build up) it starts up after sputtering a bit... i believe the fuel pump has a check valve that holds pressure at fuel rail that may be leaking fuel back into the tank causing the extended crank when the truck has sat for about an hour. Taking it back to the dealer this week. Im hoping it is not a compression issue because i also have noticed a light stumbling when letting foot off break pedal at a stop light, this could also cause a long crank issue if rpm difference between crankshaft and camshafts is off due to a malfunction in camshaft adjusters or low compression.

Hi Pierce2772,

Please report back on how your dealership visit goes!

Kori
Ram Social Care Specialist

 

[breal201999]

I've got a 2005 Pontiac G6 that has done this intermittently ever since we bought it new, and 140K miles later, it still does it. One thing I have learned, if it hesitates while starting, I can pump the gas and it will fire right up. Which seems odd since this is a fuel injected car. Maybe throttle body is stuck? It scares me using the remote start when this happens, because I'll be waking to the car in a parking lot, hit the remote start button, and I can hear it cranking and sputtering sounding like it's going to fry the starter. The bad thing is it won't stop cranking until it satisfies that it's started! Even pushing the start button again does not quit the start up process. So, I have to sprint to it and put my foot on the gas while it's cranking. Needless to say, I don't use the remote start very often!
Sorry, that probably doesn't help your situation any. Would love to know what causes this though.

 

[XXSNOTRODXX]

Im not 100% convinced my issue is fuel related. could be....but not for certain.

there is no "tricks" to getting mine to start. It will just randomly when you turn the key rather than fire right up like normal....when I turn the key to start it and I let go of the key it will continue to try and crank on its own ( tip start feature I assume? ). After about 10 seconds of cranking it will finally start up. It doesn't fire up smoothly though when this happens. It kind of "stumbles" into running. Once it is running however it is fine like normal. could be fuel, could be electrical...who knows.

 

[Wilsaaron]

I've been having this same issue on my '16 5.7L since day one. Seems to happen more often when the truck is hot. Had it into the dealer on friday and the rep said it was likely a "hot soak" issue and that there were 4 software updates to be installed. After i picked it up they said the could not "re-create" the issue (no surprise as its very intermittent) and that the software updates probably fixed it. Then today at noon it did it again after driving 40 miles or so, then stopping for 15 mins, then tried to start and i get the extended crank and a stall. Like it's not getting fuel quickly enough. Turned the key again and fires right up. Keep the replies coming as a brand new 40k truck should NEVER have an ignition issue!!

 

[whetrick1]

Could be the fuel regulator or injectors.


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[RamCares]

I've been having this same issue on my '16 5.7L since day one. Seems to happen more often when the truck is hot. Had it into the dealer on friday and the rep said it was likely a "hot soak" issue and that there were 4 software updates to be installed. After i picked it up they said the could not "re-create" the issue (no surprise as its very intermittent) and that the software updates probably fixed it. Then today at noon it did it again after driving 40 miles or so, then stopping for 15 mins, then tried to start and i get the extended crank and a stall. Like it's not getting fuel quickly enough. Turned the key again and fires right up. Keep the replies coming as a brand new 40k truck should NEVER have an ignition issue!!

Hi Wilsaaron,

Was your dealership aware that the concern you're describing prevents itself after a longer drive? It's possible it was not test driven long enough for the issue to be replicated.

Kori
Ram Social Care Specialist

 

[StoneDude76]

Does anyone think it could be a collapsed lifter causing the extended crank? Like a valve is stuck open a little causing low compression. I've been getting the tap at start up every now and then and it's happening alot more now. So I wonder if it's getting worse.


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