Medium and Heavy Trucks

Have truck repair questions? Ask an Expert

Ask an Expert,
Get an Answer ASAP!

My o6 assert was just recentlybumped up to 625 ran great for…

Customer Question
My o6 assert was...

My o6 assert was just recentlybumped up to 625 ran great for week or so now fell on its face again won't pull more than 20 pounds of boost any ideas

Mechanic's Assistant: What is the complete model and serial number of your machine?

Msx47198 c15 assert in a 06 pete

Mechanic's Assistant: Anything else you want the equipment mechanic to know before I connect you?

The actors have been deleted

Submitted: 6 months ago.Category: Medium and Heavy Trucks
Show More
Show Less
Ask Your Own Medium and Heavy Trucks Question
Answered in 2 minutes by:
1/4/2018
Technician: Cat Man, Cat Engine Expert replied 6 months ago
Cat Man
Cat Man, Cat Engine Expert
Category: Medium and Heavy Trucks
Satisfied Customers: 9,408
Experience: I am ASE Master Truck Certified.
Verified
Thanks for asking your question. I will try and help you out.
Does the yellow check engine light come on when driving?
Ask Your Own Medium and Heavy Trucks Question
Customer reply replied 6 months ago
once and flashed a 385-1
Technician: Cat Man, Cat Engine Expert replied 6 months ago
Thanks for asking your question. I will try and help you out.
That’s a low intake valve actuation oil pressure code. When this is active the engine will derate.Please reply back if you need more help or have more questions. I am happy to assist.
Ask Your Own Medium and Heavy Trucks Question
Customer reply replied 6 months ago
It pulled hard for a week then upper turbo bolts loosened up and blew was just gasket I replaced all
Technician: Cat Man, Cat Engine Expert replied 6 months ago
I see.Thanks for the information.I would suspect 1 of 2 things are causing your problem.The first 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 75 and 90 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 underneath the bottom of the filter housing. 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.Second 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 Medium and Heavy Trucks Question
Technician: Cat Man, Cat Engine Expert replied 6 months 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 Medium and Heavy Trucks Question
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 Cat Man Your Own Question
Cat Man
Cat Man
Cat Man, Cat Engine Expert
Category: Medium and Heavy Trucks
Satisfied Customers: 9,408
9,408 Satisfied Customers
Experience: I am ASE Master Truck Certified.

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:

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

2,775 satisfied customers

Owner at DJ Wilson

Cat Man

Cat Man

Cat Engine Expert

9,408 satisfied customers

I am ASE Master Truck Certified.

Wayne

Wayne

Journeyman

2,869 satisfied customers

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

Jeremy

Jeremy

Certified Truck/Bus Technician

2,235 satisfied customers

ASE Med/HD Truck Technician, NATEF Diesel Engines and Electrical/Electronics Technician, EPA 608/609 HVAC Certified, Steering/Suspension and ABS/Brakes Technician

cumminsdr

cumminsdr

Mechanic

1,337 satisfied customers

All types of Cummins applications

Curtis B.

Curtis B.

Technician

961 satisfied customers

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

dieseldan55

dieseldan55

Contractor

74 satisfied customers

Road Service mechanic for Volvo Construction.

< Previous | Next >

Related Medium and Heavy Trucks Questions
On a 2005 cat c15 acert engine the vva were deleted in the
On a 2005 cat c15 acert engine the vva were deleted in the new program can they be removed… read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
9,408 satisfied customers
Mbn c15 no power fuel psi at wot 90 psi at idle 80 psi gauge
Mbn c15 no power fuel psi at wot 90 psi at idle 80 psi gauge bounces … read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
9,408 satisfied customers
Cat Man, I have a 6NZ that I'm having a couple issues with.
Cat Man, I have a 6NZ that I'm having a couple issues with. The first and worst is I had it in for a 10,000 mile service and found antifreeze coming out of # 4 exhaust port. 20,000 miles ago it had a … read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
9,408 satisfied customers
I have a 2004 c15 bridge 625 with a cat 525 program we put
Hello, I have a 2004 c15 bridge 625 with a cat 525 program we put in computer. I have a problem with the egt going high when driving in temperatures above 82 degrees. seems like any boost above 20 lbs… read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
9,408 satisfied customers
I have an 06, 530 isx. can't get over 20 pounds boost.change
I have an 06 , 530 isx. can't get over 20 pounds boost.change the turbo and manifold and eliminated EGR. Had ECM programed for signature 600. no leaks in air to air. with vgt turbo Pyro meter showed e… read more
Jackie Dempsey
Jackie Dempsey
Heavy Line Technician
Automotive and Diesel Engines
100 satisfied customers
Okay still having problems with my c15 avert. Pulling good
Okay still having problems with my c15 avert. Pulling good boast 40-50 pounds. Seems slow and it falls on its face even pulling that much boast it's and 2007 peterbilt… read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
9,408 satisfied customers
Cat Man What are the specs on oil consumption? What is
Cat Man What are the specs on oil consumption for 6NZ47912? What is considered normal? What is excessive? Thanks… read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
9,408 satisfied customers
2008 cat c15 SDP05927 Engine will run perfect when I first
2008 cat c15 SDP05927Engine will run perfect when I first start it but once it's up to temp it will start running choppy like a cammed up racecar and if I Rev up the motor, it will puff blue. If I shu… read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
9,408 satisfied customers
Ok have had a def delete done on 2013 dd15 560 hp lost all
Ok have had a def delete done on 2013 dd15 560 hp lost all hp I previously had .I use a steinbaur power box and it works perfect.Prior to the delete with the steinbaur this engine ran perfect now I lo… read more
Jeremy
Jeremy
Certified Truck/Bus Technician
Associate Degree
2,235 satisfied customers
sprinter: i have a 2002 freightliner 3500# ***** it has
i have a 2002 freightliner 3500# ***** it has the turbo 5 cyl. i hit a deer ,instanley the motor went flat, but was able to drive home by slap shift, fixed and replaced all parts and the turbo boost a… read more
Peter Zavarelli
Peter Zavarelli
Automotive Diagnostic Specialist
General auto certifications
415 satisfied customers
I have a 2004 Pete with a C15 CAT. Driver said truck idles
I have a 2004 Pete with a C15 CAT. Driver said truck idles fine but when you take off under a pull it cuts out like it's starving for fuel. Both fuel filters have been replaced (still cuts out). Fuel … read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
9,408 satisfied customers
HI I HAVE A 2006 MXS C15 IN A KENWORTH THAT HAS UP. I
HI I HAVE A 2006 MXS C15 IN A KENWORTH THAT HAS BLOWN UP. I ALSO HAVE A 2004 BXS C15 IN PETE. WHAT DO I HAVE TO SWITCH THE TWO ENGINES? CAN I JUST SWITCH THEM?… read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
9,408 satisfied customers
HI BIG MART WE HAD STOOPS DO A OVERHAUL ON OUR 3406E CAT 475HP. IT
HI BIG MART WE HAD STOOPS DO A OVERHAUL ON OUR 3406E CAT 475HP. IT HAD BLEW A HEAD GASKET. THEY GOT IT ALL OVERHAULED AND AT FIRST IT MISSED AND POPED THROUGH EXHAUST. THEN THEY READJUSTED THE OVERHEA… read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
9,408 satisfied customers
I have a 05 625 cat accert and having low power issues. We
I have a 05 625 cat accert and having low power issues. We had a ECM writer program the ECM for performance. We've installed a fass system and per the ecm writer backed the vva's of a full turn. I'm b… read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
9,408 satisfied customers
I have a c15 cat in a kw w900b with logged code intake
I have a c15 cat in a kw w900b with logged code intake actuation pressure sensor, but having problems diagnosing cause as my ECM won't even give my a code if I unplug the sensor from motor?… read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
9,408 satisfied customers
I got 2009 Freightliner Columbia c15 sdp13149. In the past
I got 2009 Freightliner Columbia c15 sdp13149. In the past it gives me regen and check engine lights for a second once in a while. 2 weeks ago i cleaned DPF filter it was very dirty but in good condit… read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
9,408 satisfied customers
HI, I have a 1998 International 9700 with a series 60 12.7L.
HI, I have a 1998 International 9700 with a series 60 12.7L. it runs ok at idle and in low RPMs, but when im goin at about 35 mph it seems like it is running out of fuel for a few seconds then it runs… read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
9,408 satisfied customers
Kenworth w900: I have a cummins ISX 550 hp,dpf engine,it seems
I have a cummins ISX 550 hp,dpf engine,it seems to be de-rating it self pulling hills,I run the same areas all the time & I find myself droppin 11/2 gear more than before on certain hills...I had Perf… read more
cumminsdr
cumminsdr
Mechanic
High School or GED
1,337 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