RV

Have RV questions? Ask an RV mechanic online.

Ask an Expert,
Get an Answer ASAP!

My 2007 Tuscany with Cat C7 engine 350 HP has lack of power…

Customer Question
My 2007 Tuscany with Cat...
My 2007 Tuscany with Cat C7 engine 350 HP has lack of power and shakes under load at all speeds.Was running fine until I stopped for fuel, when I accelerated the engine started shaking under load and had to shift to low gear and keep RPM up.
Submitted: 2 years ago.Category: RV
Show More
Show Less
Ask Your Own RV Question
Answered in 2 minutes by:
1/21/2016
RV Mechanic: Cat Man, Cat Engine Expert replied 2 years ago
Cat Man
Cat Man, Cat Engine Expert
Category: RV
Satisfied Customers: 9,459
Experience: 23 years Caterpillar Engine experience
Verified

Thanks for asking your question. I will try and help you out.

Does the yellow check engine light come on while driving? Or just low power and no light?

Ask Your Own RV Question
Customer reply replied 2 years ago
Low power and no lights
RV Mechanic: Cat Man, Cat Engine Expert replied 2 years ago

Thanks for the information.

Since the check engine light does not come on, I would suspect 1 of 3 things are causing your problem.

The first is you picked up some bad fuel. It may have water in it. I say this since you just filled up.

Second is low fuel pressure. If there is a low fuel pressure problem, the check engine light will not come on and the engine will have low power. Your engine should maintain a fuel pressure between 65 and 85 psi. There is a plug beside of the secondary fuel filter that is used to check the pressure. If it is low, I would first try the fuel filters if you haven’t already. If it is still low, you may have a failed fuel pressure regulator, which is located on the back of the cylinder head. I have replaced a ton of these for low fuel pressure. It is kinda a known problem. You could also have a weak fuel transfer pump or restricted hand primer pump, if your engine has one.

Third I would suspect you have a low boost condition. This can be caused by a leak in the air piping or air to air aftercooler on the truck. I would first inspect all of the piping to see if there is a hole in any of the rubber boots that hold the pipes. From there you may want to cap off one side of the air to air cooler, and pressurize it. They have been known to crack and leak and cause low boost.

Please let me know if you need more help or have more questions.

Ask Your Own RV Question
RV Mechanic: Cat Man, Cat Engine Expert replied 2 years ago

Hey. I just wanted to see how things were going. Please let me know if you need more help. I am happy to assist. If my information was helpful, please leave a good or higher rating so that I receive credit. Thanks.

Ask Your Own RV Question
Was this answer helpful?

How JustAnswer works

step-image
Describe your issueThe assistant will guide you
step-image
Chat 1:1 with a rv mechanicLicensed Experts are available 24/7
step-image
100% satisfaction guaranteeGet all the answers you need
Ask Cat Man Your Own Question
Cat Man
Cat Man
Cat Man, Cat Engine Expert
Category: RV
Satisfied Customers: 9,459
9,459 Satisfied Customers
Experience: 23 years Caterpillar Engine experience

Cat Man is online now

A new question is answered every 9 seconds

How JustAnswer works:

  • Ask an ExpertExperts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional AnswerVia email, text message, or notification as you wait on our site. Ask follow up questions if you need to.
  • 100% Satisfaction GuaranteeRate the answer you receive.

JustAnswer in the News:

Ask-a-doc Web sites: If you've got a quick question, you can try to get an answer from sites that say they have various specialists on hand to give quick answers... Justanswer.com.
JustAnswer.com...has seen a spike since October in legal questions from readers about layoffs, unemployment and severance.
Web sites like justanswer.com/legal
...leave nothing to chance.
Traffic on JustAnswer rose 14 percent...and had nearly 400,000 page views in 30 days...inquiries related to stress, high blood pressure, drinking and heart pain jumped 33 percent.
Tory Johnson, GMA Workplace Contributor, discusses work-from-home jobs, such as JustAnswer in which verified Experts answer people’s questions.
I will tell you that...the things you have to go through to be an Expert are quite rigorous.

What Customers are Saying:

Excellent reply, and also very quick. Really sounds like the Expert knows what he is talking about. I will be back to use your service when I need more help with my RV.

DutchUSA

Highly recommend this RV expert. Prompt, good and detailed answers were given. Very willing to help with genuine concern. I will ask for him next time.

JackUSA

I would (and have) recommend your site to others I was quite satisfied with the quality of the information received, the professional with whom I interacted, and the quick response time. Thanks, and be sure that I'll be back whenever I need a question answered in a hurry.

Stephanie PElm City, NC

used your service this weekend with "Trecers" help. thank you ,thank you, thank you. replaced an A/C fan motor. Local Auto Zone had part. $15.00 "tracer" fee and $40.00 for parts, I saved several hundreds of dollers at a shop. i will recommend you and use you in the future.

David L.Richmond, TX

9 dollars, 2 hours of my time, and I drove away. Your diagnosis was right on the mark. Thank you so much.

PhilMarysville, CA

Lurch. Thank you very much. I had real doubts about this website but your promptness of response, quick followup and to the point answer with picture was incredible.

CharlesWalnut Creek, CA

As a single woman, I really appreciate an excellent and affordable opinion.
Thank you Geordie, I will not hesitate to contact justanswer in the future!

SueCharleston, WV

< Previous | Next >

Meet the Experts:

gene

gene

RV Mechanic

1,100 satisfied customers

28 yrs exp in the industry

Nick

Nick

RVIA Certification

664 satisfied customers

5 years RV repair and reconstruction, Fleetwood RV Training course completion.

Steve F.

Steve F.

RVIA Certification

443 satisfied customers

Journeyman and Master RV technician, Mechanical & Aerospace Engineer. RVIA Technical Consultant

Randall

Randall

RVIA Certification

14,309 satisfied customers

RVDA/RVIA Master Certified Technician with many years experience.

Robert

Robert

RV Mechanic

13,792 satisfied customers

18 yrs. RV experience including Cummins North West, Country Coach, Monaco Coach - vendor certified.

Wayne

Wayne

RV Mechanic

995 satisfied customers

Work on several type of Rv engine, Trans, brakes

Chris (aka-Moose)

Chris (aka-Moose)

RV Mechanic

514 satisfied customers

16 years of experience

< Previous | Next >

Related RV Questions
Need air filter part number and info on how to access for
need air filter part number and info on how to access for replacement on a 2007 Damon Tuscany with freight liner chassis model # xc-r … read more
TIM MOHR
TIM MOHR
SHOP OWNER
Master's Degree
8,037 satisfied customers
I have a 2007 Fleetwood Revolution, C9 Cat with an Allison
I have a 2007 Fleetwood Revolution, C9 Cat with an Allison Trans. I am getting a J1939 error periodically and at the same time several gauges stops working, red warning lights blink on those gauges an… read more
Robert
Robert
RV Mechanic
Vocational, Technical or Trade Scho
13,792 satisfied customers
I have a 2006 winnebago pusher with a 350 hp c7 cat. engin.
I have a 2006 winnebago pusher with a 350 hp c7 cat. engin. have lost power . max speed is 45-45 on flat road. all instruments on dash are showing good. it is blowing black smut out the exhaust under … read more
Pete
Pete
Independent Auto Technician
Vocational, Technical or Trade Scho
138 satisfied customers
Guillory, just changed primary and secondary fuel filters
Guillory, just changed primary and secondary fuel filters put on a prime pump. Engine stared fine, after running for a afew min. started running rough and no power in drive. … read more
Robert
Robert
RV Mechanic
Vocational, Technical or Trade Scho
13,792 satisfied customers
Ford 6.8L: Hi. I have a 6.8L FORD 1999 V-10 engine in a 35
Hi. I have a 6.8L FORD 1999 V-10 engine in a 35 foot RV. It has ran great for the last 3 years (I bought it in 2011). I had the transmission replaced in 2013. It recently started acting really strange… read more
Chris (aka-Moose)
Chris (aka-Moose)
RV Mechanic
Vocational, Technical or Trade School
514 satisfied customers
I have a 07 Motorhome on freightliner chassis. Driving on
I have a 07 Motorhome on freightliner chassis. Driving on highway engine goes to idle rpm, I stop turn engine off wait for few mins then start engine again and off we go for up to 150 miles and same t… read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
9,459 satisfied customers
i have a 2006 bluebird school bus. It has a cat c7 motor. The
i have a 2006 bluebird school bus. It has a cat c7 motor. The problem i am having is happening at he same time everyday. I park the bus and let it idle for about 15 mintues running while i am sitting … read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
9,459 satisfied customers
After warming up Cat C7 (is 2004 and has 10k miles on it) on
After warming up Cat C7 (is 2004 and has 10k miles on it) on a gulf stream 40ft DP, temp shows 1/3 way on gauge. Has lack of power on stop and go at low speed, after initial stop, press on pedal will … read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
9,459 satisfied customers
i nave a 05 fleetwood motor home with a 350 cat pusher it get
i nave a 05 fleetwood motor home with a 350 cat pusher it get hot in the mountains while pulling a toe car i have cleaned the radiator with little help also what can i do to increas the power… read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
9,459 satisfied customers
motor home..engine started..It causes a vibration while accelerating.
I have a 2005 c7 Cat engine in a 38 foot motor home. On a receint trip to Texas the engine started running rough on accelleration from about 1200 rpm through 1600 rpm. It causes a vibration while acce… read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
9,459 satisfied customers
2005 motor home..interstate..SES light and buzzer warning comes..quits
c7 3126 300 hp in a 2005 motor home Was ruunig great and it started under heavy pull or increased throttle like to get up to speed entering interstate. The SES light and buzzer warning comes on and th… read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
9,459 satisfied customers
Limited: RV..tow..trailer..big block diesel engines..Cummins
I've been shopping for a diesel pusher RV for some time and have done my homework. I will tow a trailer that's close to 10,000 lbs loaded, so I've limited my search to those with side radiators and "b… read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
9,459 satisfied customers
DIPLOMAT: w 2000 cummins 315 RUNNING FINE STOPPED..ACCELERATE..neutral
HAVE DIPLOMAT w 2000 CUMMINS 315 RUNNING FINE STOPPED AT LIGHT WOULD NOT ACCELERATE ABOVE 2200 RPM . After about a mile shifted into 3 rd only would go up to 2200 rpm. Stopped at light put in neutral,… read more
RV SPECIALIST
RV SPECIALIST
OWNER -RV REPAIR COMPANY
Vocational, Technical or Trade Scho
304 satisfied customers
Star: tow an enclosed trailer..Assuming the 350hp cummins..coach
How will the Fleetwood Revolution and/or the Newmar Dutch Star tow an enclosed trailer that is about an 8500 lb load? Assuming the 350HP Cummins with Allison 6 speed....really would prefer not to have… read more
Robert
Robert
RV Mechanic
Vocational, Technical or Trade Scho
13,792 satisfied customers
used Motor Home and want a cummins engine..small block compared
Sir: I am looking to purchase a used Motor Home and want a cummins engine. I have been advised a 300 hp cummins is a small block compared to a 300 hp Cat,which I am advised is a large block. Is this c… read more
Robert
Robert
RV Mechanic
Vocational, Technical or Trade Scho
13,792 satisfied customers
We have a 1997 hurricane by four winds fuel injected 460 ford.
We have a 1997 hurricane by four winds fuel injected 460 ford. Recently we have been losing power while the coach is under load, climbing accelerating etc. We replaced the plugged fuel filter symptom … read more
RV Doctor
RV Doctor
Shop Foreman
Vocational, Technical or Trade Scho
324 satisfied customers
mountains: motor home..climbing..maximum rpms to use in lower gears
We have a 350 Cat C7 engine in a 36' motorhome. When climbing mountains, what is the maximum rpms to use in lower gears?… read more
Tim
Tim
Maintenance Supervisor
Associate Degree
356 satisfied customers
I have a 33 ft. Fleetwood Flair with a 6.5 ltr Diesel ...
I have a 33 ft. Fleetwood Flair with a 6.5 ltr Diesel pusher.....It climbs hills very slowly and will not accelerate well on the flat.. When I step on the accellerator to get more power it seems to "d… read more
RIP ROBERT
RIP ROBERT
OWNER
High School or GED
303 satisfied customers
Disclaimer: Information in questions, answers, and other posts on this site ("Posts") comes from individual users, not JustAnswer; JustAnswer is not responsible for Posts. Posts are for general information, are not intended to substitute for informed professional advice (medical, legal, veterinary, financial, etc.), or to establish a professional-client relationship. The site and services are provided "as is" with no warranty or representations by JustAnswer regarding the qualifications of Experts. To see what credentials have been verified by a third-party service, please click on the "Verified" symbol in some Experts' profiles. JustAnswer is not intended or designed for EMERGENCY questions which should be directed immediately by telephone or in-person to qualified professionals.

Disclaimer: Information in questions, answers, and other posts on this site ("Posts") comes from individual users, not JustAnswer; JustAnswer is not responsible for Posts. Posts are for general information, are not intended to substitute for informed professional advice (medical, legal, veterinary, financial, etc.), or to establish a professional-client relationship. The site and services are provided "as is" with no warranty or representations by JustAnswer regarding the qualifications of Experts. To see what credentials have been verified by a third-party service, please click on the "Verified" symbol in some Experts' profiles. JustAnswer is not intended or designed for EMERGENCY questions which should be directed immediately by telephone or in-person to qualified professionals.

Show MoreShow Less

Ask Your Question

x