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Cat C7 starts, idles, but won't rev up in gear.

Randy_A
Explorer
Explorer
I have a 2005 Fleetwood Excursion on a Freightliner XC chassis with a 350 hp Cat C7. I drove it about 40 miles two weeks ago and it ran fine, accelerated good and ran 55-60 on the highway no problem. Yesterday I started it up tried to back out of my driveway and it would not make it up the small grade. It started easy, idles good, and will rev up when in neutral, but when in gear, forward or reverse, the throttle pedal goes down and nothing. I thought maybe it was fuel filters so I changed them this morning, no change. Any help would be greatly appreciated.
28 REPLIES 28

Rolandh
Explorer
Explorer

Randy. Were you able to fix this problem as I have one that has the same issue? 

Randy hasn’t been on here in almost 10 years so it isn’t likely he is going to respond to your inquiry. However, if you would have read down through a few posts you would have found that Randy changed the air filter and it solved his problem.

Thank you. I asked the question before I signed up so I couldn’t see dates or other post

msmith1199
Explorer
Explorer
.

2021 Nexus Viper 27V. Class B+


2019 Ford Ranger 4x4

FIRE_UP
Explorer
Explorer
I'm not overly trusting in those filter minders. We had them on all our fire trucks and, just like when I changed it on our motor home, they all read the same thing when we changed them on the fire trucks after quite a few miles. Mine on our coach, was never changed prior to 50K miles and, it read about half way. I changed the air filter, and reset it and, it read about half way. So, it's simply a "catastrophic" reading that I will have to pay attention to.
Scott
Scott and Karla
SDFD RETIRED
2004 Itasca Horizon, 36GD Slate Blue 330 CAT
2011 GMC Sierra 1500 Ext Cab 4x4 Toad
2008 Caliente Red LVL II GL 1800 Goldwing
KI60ND

Randy_A
Explorer
Explorer
Air filter minder was getting down to the last open yellow line, but I recall that when I replaced the air filter 3 years ago I reset the minder and it almost immediately when back toward that area. The filters I get from Freightliner are Racor. I haven't cut it open, and probably won't, but it does feel heavy and dust flies when I bounce it on the concrete shop floor. I travel from PA to WY and back each summer and PA to FL and back each winter. I don't drive on any dirt roads by choice, maybe some dirt driveways, but very limited, have been forced to use a few dirt construction zones in WY, but again very limited. Who knows where that much dirt came from, but it works now. I do need to reset that filter minder and see what it does this time.

Diplomat_St_Poo
Explorer
Explorer
It was a few years ago so I an not sure what our air filter minder said. Although I would have thought the Cat Service would have checked it and they didn't mention the air cleaner at all.
2005 GB Cruise Air XL DP
3 slides, 350 Cat
2002 Ford Explorer, drag along
3 Standard Poodles 1 Mini Poodle
Vancouver Island BC, Canada

wolfe10
Explorer
Explorer
Yes, what was your AIR FILTER MINDER reading when this occurred?
Brett Wolfe
Ex: 2003 Alpine 38'FDDS
Ex: 1997 Safari 35'
Ex: 1993 Foretravel U240

Diesel RV Club:http://www.dieselrvclub.org/

RayChez
Explorer
Explorer
Racor sells the best filters for those cat engines. I have been very happy with the more power I got when I switched from the Napa air filters.
2002 Gulf Stream Scenic Cruiser
330 HP Caterpillar 3126-E
3000 Allison Transmission
Neway Freightliner chassis
2017 Buick Envision

SCVJeff
Explorer
Explorer
Out of curiosity, do you have a back pressure gauge on the intake, and what did it say?
Jeff - WA6EQU
'06 Itasca Meridian 34H, CAT C7/350

Diplomat_St_Poo
Explorer
Explorer
Excellent news Randy A.
When it happened to us the cat service centre we limped into did not solve it either. They pulled the codes, they said low fuel pressure, changed fuel filters but it didn't help. My husband and I talked it out while camped overnight in their parking lot. Husband pulled out the filter the next morning, run perfect.
Had to search around a few places for a replacement (cat service didn't have one). Finally found a cleanable one. Back to full power 🙂

Thanks for the follow-up.
2005 GB Cruise Air XL DP
3 slides, 350 Cat
2002 Ford Explorer, drag along
3 Standard Poodles 1 Mini Poodle
Vancouver Island BC, Canada

wolfe10
Explorer
Explorer
Randy,

Cut the old filter open. Look for excessive dirt or signs that it got wet. Water is a real killer of paper filters (doesn't matter if gas or diesel).
Brett Wolfe
Ex: 2003 Alpine 38'FDDS
Ex: 1997 Safari 35'
Ex: 1993 Foretravel U240

Diesel RV Club:http://www.dieselrvclub.org/

Big_Katuna
Explorer II
Explorer II
Standard Poodle owners rock! Glad you got it figured out.
My Kharma ran over my Dogma.

Randy_A
Explorer
Explorer
Thank you to all that responded to this post that I made last Sunday as I pulled my hair out trying to get my moho to run. Well Diplomat St Poodles wins the prize this time, as it turned out to be the air cleaner. In discussion with several friends we had dismissed the air cleaner as I had changed it only 22,000 miles ago. On last Monday morning I loosened the clamp and pried the hose off and retried it with the air intake wide open, and it ran fine. I immediately called my Freightliner dealer and they had to order it for me. The new air cleaner arrived Friday, and is installed now, and the Excursion is running fine, ready to leave next Tuesday for a 30 day trip to Wyoming. I still have no idea why it was blocked enough to effect performance that much after only 22,000 miles. Thanks again for the replies.