2015 Engine Limp But no Code

[stickk]

So, on 6-8 occasions over the last month I've lost engine power, engine did not die, and then it recovers and is as nothing happened. I've had it to a private mechanic 2 times and there are no codes. Today he went for a drive with me with his Snap-On Diagnostic equip hooked up, of course nothing happened during the drive.
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2 times as I was turning onto my street it has occurred. I'm driving in 5th gear at 55mph, slow down and coast onto my road, push the accelerator and nothing. Engine kind of stumbles a bit, and in a few seconds it comes back to life.

2 times while traveling at 60-65 mph for a 3-4 mile stretch, up a grade for about a mile then levels off for 1/4-1/3 mile before a stop light. Stop at the light then go for green and nothin, just idle rpm's. The first time this happened I limped off onto the shoulder, shut the truck off and waited for 10-15 seconds, restarted the truck and it was fine.

2 times on the freeway at 70+ mph. 1st time was just a quick stumble as I was accelerating to around someone. 2nd time I lost power to accelerate, all I could do was coast until it woke up.

2015-6.7-68rfe. 61,000 miles. I change oil and filter and both fuel filters at 20% life. FF's changed at 57k. Just changed the CCV filter yesterday.

Thanks for reading

 

[EDankievitch]

Hate to say it but youmight want to stop in and see you'r friendly dealer. I've had a few times where I had a code pop up that I could read on my scan tool and when I went to the dealer they found a few other codes that did not show up on my scan tool.

 

[Wal_mart]

may not be any help, but, when I first got my 14 I had the habit of resting my left foot on brake, anticipating coming slow sown. The truck would go into idle mode, thanks to Toyota. No codes. Dealer somehow knew what i had done, hidden code?

 

[stickk]

Update to the problem I was having. I had the truck in for the SCR recall and was able to talk to the service manager who is also a diesel tech. He said that the issue I was having sounded like it was egr valve related. He used the term "Tip in". Something to do with when there isn't enough venturi to draw in egr then the throttle valve closes to create vacuum, blah, blah, blah. His suggestion was to clean the egr valve.

I cleaned it this wkd, got it back together and went out for a test run on a section of road where I've had the throttle loss/limp issue several times. Nada. Turned around and ran it again, nada. I've ran that road 4 times in the last 2 days and the truck is fine. Ran another area that I've had an issue 3-4 times and the truck didn't do it. I know it's early, but I think the problem is resolved.

I didn't think the egr valve was too sooty. But, I guess it was enough to cause the shaft to not move freely enough, IDK. But all seems well now.

 

[stickk]

BTW, truck is a 2015, 2500. I bought it May 29, 2015. Issue started in late November, early December 2016, roughly 60k miles.

 

[Bob4x4]

Update to the problem I was having. I had the truck in for the SCR recall and was able to talk to the service manager who is also a diesel tech. He said that the issue I was having sounded like it was egr valve related. He used the term "Tip in". Something to do with when there isn't enough venturi to draw in egr then the throttle valve closes to create vacuum, blah, blah, blah. His suggestion was to clean the egr valve.

I cleaned it this wkd, got it back together and went out for a test run on a section of road where I've had the throttle loss/limp issue several times. Nada. Turned around and ran it again, nada. I've ran that road 4 times in the last 2 days and the truck is fine. Ran another area that I've had an issue 3-4 times and the truck didn't do it. I know it's early, but I think the problem is resolved.

I didn't think the egr valve was too sooty. But, I guess it was enough to cause the shaft to not move freely enough, IDK. But all seems well now.

There is an airflow valve that ensures there will be egr flow when required to meet standards.An airflow valve failure is more likely to kill power.In the diesel you can have 100% egr flow and it will not kill power(unlike a gasser).Is there a chance when the truck hicupped you did some 2 foot driving? A clean egr valve that opens and closes as designed will help the rest of the system working at optimum.

 

[stickk]

I am not a two-footed driver. Whatever the situation was cleaning the EGR has seemed to have fixed the problem and I'm happy about that

 

[DonFitzwater]

I'm glad your problem is fixed.....I find that my truck runs the same way you described your problem even though it's an automatic and I'm positive my truck is experiencing extreme dead pedal.*

 

[stickk]

Don, my truck would not accelerate for 5-10 seconds. All times other than once I was moving, 10-70 mph. One time I was at a stop light and I could move. I could barely get off the road once the light turned green. Not sure what you mean by dead pedal, slow to react to pedal position or a total loss of acceleration as I described above? If the latter, try cleaning your egr

 

[stickk]

" I couldn't move"

 

[DonFitzwater]

Don, my truck would not accelerate for 5-10 seconds. All times other than once I was moving, 10-70 mph. One time I was at a stop light and I could move. I could barely get off the road once the light turned green. Not sure what you mean by dead pedal, slow to react to pedal position or a total loss of acceleration as I described above? If the latter, try cleaning your egr

The symptoms I get are slow to respond and sometimes it won't accelerate for what seems like an eternity (5-8 seconds)My truck has 2000 miles on it.......if the EGR needs to be cleaned, there is something badly wrong and I'll be leaving that up to the dealer. FYI-The newer trucks aren't supposed to need EGR cleaning as a regular preventative maintenance so at 60k, I'd still say you have a root issue that needs to be resolved possibly. Hopefully for your sake though it's just a one time glitch!

 

[stickk]

Bob,

I asked the service manager/diesel tech if the malfunctioning EGR valve could cause the throttle valve to close completely thus causing the computer to read no air and cut fuel supply thus causing the NO-GO situation. He didn't think so. BTW, I had no check engine light of codes.

 

[stickk]

Don, my truck is an auto too, 68RFE

 

[DonFitzwater]

Don, my truck is an auto too, 68RFE

I mis-read that you had a manual.

 

[Bob4x4]

Bob,

I asked the service manager/diesel tech if the malfunctioning EGR valve could cause the throttle valve to close completely thus causing the computer to read no air and cut fuel supply thus causing the NO-GO situation. He didn't think so. BTW, I had no check engine light of codes.

I don't think I said a dirty egr valve would cause the airflow valve to close.If the air flow valve(picture a throttle body)closes you will have no power.The egr valve has many dtc's that it can set.It would be very unlikely as many times you said you experienced the fault that no dtc's were set.Did your dealer use the wi-advisor in the service drive and give you the print out?

 

[stickk]

Bob, "unable to duplicate". I think they have this phrase on a speed dial.

I also have a growling noise coming from the torque converter while coasting from 40 mph down to 25 mph, then the TC unlocks and the noise goes away. I drive the truck with a service tech. I could hear it, he said he couldn't. It sounds like a G56 with a solid flywheel conversion while at low rpm.

It's difficult when you rely on you vehicle everyday and the dealership's why you to leave your truck with then all day, even when you have a specific time appt.

 

[Bob4x4]

Bob, "unable to duplicate". I think they have this phrase on a speed dial.

I also have a growling noise coming from the torque converter while coasting from 40 mph down to 25 mph, then the TC unlocks and the noise goes away. I drive the truck with a service tech. I could hear it, he said he couldn't. It sounds like a G56 with a solid flywheel conversion while at low rpm.

It's difficult when you rely on you vehicle everyday and the dealership's why you to leave your truck with then all day, even when you have a specific time appt.

I understand your frustration,most dealers need to improve their communication skills.The trend for appointments industry wide(Dealers of most brands)is to deal with an advisor only.Not when the tech will diag/repair the vehicle.Most dealers do not explain this when the appt.is made.
With the complexity of new vehicles today getting a vehicle in and out with a difficult to verify concern is an unrealistic expectation.If you have a Maxcare service contract it will remove the stress of not having your Daily Driver as you can get a first day rental free.

 

[stickk]

Bob, can there be codes set in the computer without setting a check engine light?

I understand the issue with service dept's staff. They have service advisors that probably can't change their own oil communicating with customers about the problems their having and trying to translate that to a ticket for the Technician, who most of the time didn't know how to diagnose a problem if the computer doesn't tell then what the problem is.

It is the same in my industry as well, residential construction. Very few carpenters or mechanics out there that can problem solve when a issue out of the norm arises.

 

[Bob4x4]

There are dtc's that do not set the light.There are also some faults that are a 2 trip fault,they will not trip a light unless the fault happens twice in a single trip.I have seen techs erase codes and report no fault found.That is why I asked if wi-advisor was used and a print out given to you.It scans the vehicle at time of write up and will show any up dates are available,warranty coverage,recalls,and any dtc's in the system before the tech ever sees the vehicle.

 

[stickk]

I have no idea. I'll ask the service manager.

Thank you