Breakdown Mystery

Topic 31061 | Page 1

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Bruce K.'s Comment
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This week I had a power unit problem that I don’t understand. I’m cruising along just fine at 65 mph and I start to hear a clunking from inside the dash in front of me. Then the truck (2019 Frightliner Cascadia) begins to lose power. The engine was still running but my speed decreased to 45mph on a downgrade before I came up on an emergency parking area on I80. Pulled over and called the company who then called an emergency road service from the area. Technician arrives, hooks up his diagnostic computer and doesn’t get any codes. He tells me as far as he can tell, there is no problem. Suggests that I get going again and he will follow me for a while to see if the problem persists. So I get going again and the problem has vanished. Continued……….

Bruce K.'s Comment
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No more power loss, no more clunking sounds. I talked to my friend who is an experienced driver and he said he has heard of this happening and all it takes to correct the problem is to shut down for a while and maybe the computer part of the truck resets and the problem goes away. Now, this is embarrassing to me because this cost the company money to have road service come out and now the report will be that they found nothing wrong. Not to mention that the wait time for service caused me to get in a whopping 44 miles of driving in that day. (lol)

But I’m most interested in if anyone has heard of this issue with Frightliners?

Maybe Gremlins?

PackRat's Comment
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It should show up if the ECU data is looked at with a laptop diagnostic check. The noises is not normal, then engine degrade afterwards indicates there is an actual problem.

Stevo Reno's Comment
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Can't find anything related with the clunk noise you hear. Power loss hmmm when were the fuel filters replaced last?? The water separator filter? Mileage on your tractor ??

Read shut down randomly could be related to PNDB big fuse box on firewall underwood behind airlines. Or bad ignition switch.... But you said slowed down not totally died.

A mechanical issue will not set a code, like an electrical/ sensor 1 does...

Stevo Reno's Comment
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Bruce, Remembering now, we had a load to Washington State, and our truck was slowing down, losing power. We made it to Salem, OR, where dispatch sent us (Gardner terminal) And our fuel filters at the injector pump, were totally clogged up !

They replaced em and end of problem.....CRST Does NOT change the fuel filters every PM service, which is DUMB, I think. Our trucks got PMs every 50K....Plus our trouble began after fueling at TA, on I-80, first 1 in Wyoming, from Utah.

We got a load of bad fuel there TWICE, left bad taste in my mouth with TA's ..............When I was a diesel tech, EVERY filter was replaced each PM.

Cheap insurance, over a break down, service call, or worse a tow to a shop !!

Terminal:

A facility where trucking companies operate out of, or their "home base" if you will. A lot of major companies have multiple terminals around the country which usually consist of the main office building, a drop lot for trailers, and sometimes a repair shop and wash facilities.

TWIC:

Transportation Worker Identification Credential

Truck drivers who regularly pick up from or deliver to the shipping ports will often be required to carry a TWIC card.

Your TWIC is a tamper-resistant biometric card which acts as both your identification in secure areas, as well as an indicator of you having passed the necessary security clearance. TWIC cards are valid for five years. The issuance of TWIC cards is overseen by the Transportation Security Administration and the Department of Homeland Security.

OWI:

Operating While Intoxicated

Bruce K.'s Comment
member avatar

Truck has 317,000 + miles. After I stopped I checked the digital dash display and it showed the soot filter was in good condition and I didn’t need a regen. I’m going to ask about the fuel filters on Monday. Thanks for the heads up

Kerry L.'s Comment
member avatar

No more power loss, no more clunking sounds. I talked to my friend who is an experienced driver and he said he has heard of this happening and all it takes to correct the problem is to shut down for a while and maybe the computer part of the truck resets and the problem goes away. Now, this is embarrassing to me because this cost the company money to have road service come out and now the report will be that they found nothing wrong. Not to mention that the wait time for service caused me to get in a whopping 44 miles of driving in that day. (lol)

But I’m most interested in if anyone has heard of this issue with Frightliners?

Maybe Gremlins?

Engine brake somehow engaged?

Bruce K.'s Comment
member avatar

Kerry, no. Engine brake was off and worked perfectly when I went from 45mph to being parked.

Robert B. (The Dragon) ye's Comment
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Bruce, does your truck have a boost gauge for the turbo? Steve mentioned fuel filters and another sign of that potentially being the problem would be a visible loss of boost on the gauge. The computer won’t allow the turbo to spool as hard of the fuel delivery isn’t there.

OOS:

When a violation by either a driver or company is confirmed, an out-of-service order removes either the driver or the vehicle from the roadway until the violation is corrected.

Bruce K.'s Comment
member avatar

Bruce, does your truck have a boost gauge for the turbo? Steve mentioned fuel filters and another sign of that potentially being the problem would be a visible loss of boost on the gauge. The computer won’t allow the turbo to spool as hard of the fuel delivery isn’t there.

Robert, thanks for that. I’ll have to check it out tomorrow with my go to mechanic.

OOS:

When a violation by either a driver or company is confirmed, an out-of-service order removes either the driver or the vehicle from the roadway until the violation is corrected.

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