Medium and Heavy Trucks

Have truck repair questions? Ask an Expert

Connect one-on-one with {0} who will answer your question

This answer was rated:

I have a 2008 Mack CHU 613. What would cause it to lose

power in the top end...
I have a 2008 Mack CHU 613. What would cause it to lose power in the top end of each gear?
Show More
Show Less
Ask Your Own Medium and Heavy Trucks Question
Customer reply replied 2 years ago
actually it is a 2009
Answered in 12 minutes by:
5/1/2020
Technician: Mike Mcmillan, Shop Foreman/Triage Tech replied 2 years ago
Mike Mcmillan
Mike Mcmillan, Shop Foreman/Triage Tech
Category: Medium and Heavy Trucks
Satisfied Customers: 6,622
Experience: Volvo/Mack Master Tech, Certified with Cummins, Eaton, GM, Hino, Detroit Diesel
Verified
Hello and thank you for using Just Answer. My name is ***** ***** I’d like to try and help. I am sorry that you are having issues with your truck. I know this can be frustrating. A few things that I would look at. If the engine is loosing power at the top end of every gear I would check and make sure you do not have any intake or ex restrictions first. Make sure your air filter is not plugged and the dpf is not restricted. The sweet spot on this engine is below 1400 so any rpms after that require more fuel and boost to carry the power up to governed speed. Make sure your fuel pressure is running around 75 plus on the top end and boost is running around 30. Check for any boost leaks because these will not show up all the time in the sweet spot. Check the reading on the egr diff pressure sensor and egr temp sensor. If all of that is fine I would have the overhead adjusted if it has not been done for a while. I hope this helps. Thank you
Mike Mcmillan
Mike Mcmillan, Shop Foreman/Triage Tech
Category: Medium and Heavy Trucks
Satisfied Customers: 6,622
Experience: Volvo/Mack Master Tech, Certified with Cummins, Eaton, GM, Hino, Detroit Diesel
Verified
Mike Mcmillan and 87 other Medium and Heavy Trucks Specialists are ready to help you
Ask your own question now
Was this answer helpful?

How JustAnswer works

step-image
Describe your issueThe assistant will guide you
step-image
Chat 1:1 with a technicianLicensed Experts are available 24/7
step-image
100% satisfaction guaranteeGet all the answers you need
Ask Mike Mcmillan Your Own Question
Mike Mcmillan
Mike Mcmillan
Mike Mcmillan, Shop Foreman/Triage Tech
Category: Medium and Heavy Trucks
Satisfied Customers: 6,622
6,622 Satisfied Customers
Experience: Volvo/Mack Master Tech, Certified with Cummins, Eaton, GM, Hino, Detroit Diesel

Mike Mcmillan is online now

Related Medium and Heavy Trucks Questions
Need to do a forced regen on my 2014 mack chu using the Tech
Need to do a forced regen on my 2014 mack chu using the Tech Tool program,is there any videos that can help me … read more
Mike Mcmillan
Mike Mcmillan
Shop Foreman/Triage Tech
Associates
6,622 satisfied customers
WORKING ON A 2013 MACK CXU 613. THIS TRUCK HAS THREE
WORKING ON A 2013 MACK CXU 613. THIS TRUCK HAS THREE CIGARETTE LIGHTER LOCATIONS ON THE INSTRUMENT PANEL. WHICH FUSE SUPPLIES THE POWER ? … read more
Mike Mcmillan
Mike Mcmillan
Shop Foreman/Triage Tech
Associates
6,622 satisfied customers
Speedometer quits working and the truck loses power. 2013
speedometer quits working and the truck loses power. 2013 mack mp8 … read more
Mike Mcmillan
Mike Mcmillan
Shop Foreman/Triage Tech
Associates
6,622 satisfied customers
2014 chu mp8, engine acts like out of fuel will not run. No
2014 chu mp8, engine acts like out of fuel will not run. No fuel pressure at secondary filter, have replaced lift pump blew out lines still no flow. What's next? … read more
Edgar.T
Edgar.T
Forman
Associate
94 satisfied customers
Engine light is on have code SPN 4811 FMI 2. SPN 110 FMI 2
Engine light is on have code SPN 4811 FMI 2 JA: Is the check engine light blinking or flashing, or is it solid? When did you first notice it? Customer: SPN 110 FMI 2 code engine light solid JA: What's… read more
Mike Mcmillan
Mike Mcmillan
Shop Foreman/Triage Tech
Associates
6,622 satisfied customers
We have a 2008 Mack 618 CHU with MP8, truck dies in 9th and
We have a 2008 Mack 618 CHU with MP8, truck dies in 9th and 10th gear on road. Have replaced all the fuel lines and fuel pump and fuel filters and housing. Any ideas?… read more
Mike Mcmillan
Mike Mcmillan
Shop Foreman/Triage Tech
Associates
6,622 satisfied customers
SCR system fault 2013 CHU 613 pinnacle. MP8 505 hp 2013 Mack
SCR system fault 2013 CHU 613 pinnacle JA: What's the make/model/year of your truck? Engine type? Customer: MP8 505 hp 2013 Mack CHU 613 JA: Are you fixing your truck yourself? What have you tried so … read more
Mike Mcmillan
Mike Mcmillan
Shop Foreman/Triage Tech
Associates
6,622 satisfied customers
I have a 2001 mack ch 613 the gear on the accessory drive
i have a 2001 mack ch 613 the gear on the accessory drive for the oil pump has moved over causing oil preasure loss. is there a set screw holding it in place.if not how do i repair … read more
Daniel Wilson
Daniel Wilson
Auto Mechanics 1&2/diesel mech
6,062 satisfied customers
I had a fan belt break on my 2008 Mack CHU613 Pinnacle and
I had a fan belt break on my 2008 Mack CHU613 Pinnacle and the connected for the fan side control clutch ripped off. I need to know how to rewire without buying the entire assembly. … read more
Mike Mcmillan
Mike Mcmillan
Shop Foreman/Triage Tech
Associates
6,622 satisfied customers
09 chu 613 surges in high gear. 2009. Ch613. Mack. Changed
Changed filters fixed wiring on egr pressure sensor … read more
Mike Mcmillan
Mike Mcmillan
Shop Foreman/Triage Tech
Associates
6,622 satisfied customers
2010 mack chu 613 PSID 46 FMI 0 and PPID 270 FMI 9. 2010
2010 mack chu 613 PSID 46 FMI 0 and PPID 270 FMI 9 … read more
Mike Mcmillan
Mike Mcmillan
Shop Foreman/Triage Tech
Associates
6,622 satisfied customers
2002 mack ch613 power steering turns to the right as it
2002 mack ch613 power steering turns to the right as it should very difficult turning left … read more
Eddy
Eddy
HD Truck Tech
GED
2 satisfied customers
2008 mack ch 613 lightin bolt on then shuts down lightin
2008 mack ch 613 lightin bolt on then shuts down lightin bolt been on for over a week just started shuttin down. Was low in water filled it but still shutn down … read more
Mike Mcmillan
Mike Mcmillan
Shop Foreman/Triage Tech
Associates
6,622 satisfied customers
I have a Mack chu 2008 mp8 motor... engine will not go 1500
I have a Mack chu 2008 mp8 motor... engine will not go 1500 rpm's … read more
Mike Mcmillan
Mike Mcmillan
Shop Foreman/Triage Tech
Associates
6,622 satisfied customers
2008 Mack CHU with a mp8 that idles and runs really rough.
2008 Mack CHU with a mp8 that idles and runs really rough. does anyone have troubleshooting on these? I have no codes active… read more
Wayne
Wayne
Journeyman
Vocational, Technical or Trade Scho
5,115 satisfied customers
2011 Mack CHU-613 Mack MP8 will not crank. When I turn the
2011 Mack CHU-613 Mack MP8 will not crank. When I turn the ignition switch I can hear the relay click on top of dash relay panel but I do not get voltage to starter. I have good battery voltage at sta… read more
Daniel Wilson
Daniel Wilson
Auto Mechanics 1&2/diesel mech
6,062 satisfied customers
Hi, we have a mack truck ch 613 e7 engine with the following
Hi, we have a mack truck ch 613 e7 engine with the following problem. While driving the truck after an hour the electrical mal function light goes on and the engine loses power suddenly. we just turn … read more
Wayne
Wayne
Journeyman
Vocational, Technical or Trade Scho
5,115 satisfied customers
We have a 2008 Mack chu 613. The codes keep coming up on sensors
We have a 2008 Mack chu 613. The codes keep coming up on sensors that we already replaced. We have heard from others that there was a big problem with the wiring on that year...do you have any informa… read more
spankyjr1
spankyjr1
Retired
Vocational, Technical or Trade Scho
420 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.

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:

Wonderful service, prompt, efficient, and accurate. Couldn't have asked for more. I cannot thank you enough for your help.

Mary C.Freshfield, Liverpool, UK

This expert is wonderful. They truly know what they are talking about, and they actually care about you. They really helped put my nerves at ease. Thank you so much!!!!

AlexLos Angeles, CA

Thank you for all your help. It is nice to know that this service is here for people like myself, who need answers fast and are not sure who to consult.

GPHesperia, CA

I couldn't be more satisfied! This is the site I will always come to when I need a second opinion.

JustinKernersville, NC

Just let me say that this encounter has been entirely professional and most helpful. I liked that I could ask additional questions and get answered in a very short turn around.

EstherWoodstock, NY

Thank you so much for taking your time and knowledge to support my concerns. Not only did you answer my questions, you even took it a step further with replying with more pertinent information I needed to know.

RobinElkton, Maryland

He answered my question promptly and gave me accurate, detailed information. If all of your experts are half as good, you have a great thing going here.

DianeDallas, TX

< Previous | Next >

Meet the Experts:

Daniel Wilson

Daniel Wilson

6,062 satisfied customers

Owner at DJ Wilson

Cat Man

Cat Man

Cat Engine Expert

5,353 satisfied customers

I am ASE Master Truck Certified.

Wayne

Wayne

Journeyman

5,115 satisfied customers

worked on, Gmc, Macks, Freight liner,Mercedes Benz,,Ford, sterling

Jeremy

Jeremy

Certified Truck/Bus Technician

2,756 satisfied customers

ASE Med/HD Truck Technician, NATEF Diesel Engines and Electrical/Electronics Technician, Network Engineer specializing in CAN faults, Aftertertreatment, and vehicle communications

Curtis B.

Curtis B.

Technician

1,947 satisfied customers

Technician turned service manager on multiple lines of trucks and engines, used in industry.

cumminsdr

cumminsdr

Mechanic

1,886 satisfied customers

All types of Cummins applications

Chris (aka-Moose)

Chris (aka-Moose)

Technician

641 satisfied customers

24 years of experience diagnosing & repairing

< Previous | Next >

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