Medium and Heavy Trucks

Have truck repair questions? Ask an Expert

Ask an Expert,
Get an Answer ASAP!

I have a 99 Mack Model RD6906 engine EM7 truck will start…

Customer Question
I have a 99 Mack...
I have a 99 Mack Model RD6906 engine EM7 truck will start tack will not work and only runs 3-4 seconds
Submitted: 2 years ago.Category: Medium and Heavy Trucks
Show More
Show Less
Ask Your Own Medium and Heavy Trucks Question
Answered in 3 hours by:
3/2/2016
Technician: Daniel Wilson,
 replied 2 years ago
Daniel Wilson
Category: Medium and Heavy Trucks
Satisfied Customers: 6,890
Experience: Owner at DJ Wilson
Verified

Hi David, My name is***** will be glad to help. Is the malfunction engine light on?

Ask Your Own Medium and Heavy Trucks Question
Technician: Daniel Wilson,
 replied 2 years ago

What codes are you getting?

Ask Your Own Medium and Heavy Trucks Question
Customer reply replied 2 years ago
The malfunction light is not on and no codes
Technician: Daniel Wilson,
 replied 2 years ago

I see you replaces the speed sensors already. Check the harness and connector pins to be sure the ECM is actually getting the speed signal. You should have 5 V to the sensor and the ECM reads the return voltage

Ask Your Own Medium and Heavy Trucks Question
Technician: Daniel Wilson,
 replied 2 years ago

Check the fuel lines between the tank and pump for leaks or restrictions sucking air. will it fire on silicone spray or ether?

Ask Your Own Medium and Heavy Trucks Question
Technician: Daniel Wilson,
 replied 2 years ago

Install a clear hose or site glass to check for air bubbles. If low fuel supply pressure you could have a faulty fuel transfer pump

Ask Your Own Medium and Heavy Trucks Question
Technician: Daniel Wilson,
 replied 2 years ago

Low coolant will shut it down but would throw a code usually for shutdown

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 Daniel Wilson Your Own Question
Daniel Wilson
Daniel Wilson
Daniel Wilson
Category: Medium and Heavy Trucks
Satisfied Customers: 6,890
6,890 Satisfied Customers
Experience: Owner at DJ Wilson

Daniel Wilson 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

6,890 satisfied customers

Owner at DJ Wilson

Cat Man

Cat Man

Cat Engine Expert

4,530 satisfied customers

I am ASE Master Truck Certified.

Wayne

Wayne

Journeyman

2,892 satisfied customers

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

Jeremy

Jeremy

Certified Truck/Bus Technician

2,243 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

1,351 satisfied customers

All types of Cummins applications

Curtis B.

Curtis B.

Technician

991 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
Another one for ya. ISX engine number 79194421. The truck
Another one for ya Steven. ISX engine number 79194421. The truck will not rack up engine hours, they are stuck. The vehicle millage will count up as normal when driving but after you shut it off and c… read more
Steven
Steven
Triage Tech/Shop Foreman
Associates
11 satisfied customers
2007 mack with an MP8 engine.The customer brought it to me
2007 mack with an MP8 engine.The customer brought it to me after spending over 20,000 at a mack dealer and having a delete done hoping it would fix his low power.i am not a Mack expert so it is a scho… read more
Steven
Steven
Triage Tech/Shop Foreman
Associates
11 satisfied customers
We have a 2009 Mack Granite GU813 with a MP7 engine. The
Hi there We have a 2009 Mack Granite GU813 with a MP7 engine. The truck initially had an egr valve fault code when we went out to it first. The truck has low power and had a DPF delete. The only activ… read more
Steven
Steven
Triage Tech/Shop Foreman
Associates
11 satisfied customers
Got a EM7-300 Mack 11GBA24622 P3 ....... was running fine
got a EM7-300 Mack 11GBA24622 P3 ....... was running fine then shut off like it ran out of fuel, cracked injectors no fuel coming out, replaced lift pump still nothing.. pressurized fuel tank getting … read more
Daniel Wilson
Daniel Wilson
Auto Mechanics 1&2/diesel mech
6,890 satisfied customers
I have a 1984 CF Mack pumper in need of a left corner bumper
I have a 1984 CF Mack pumper in need of a left corner bumper (split bumper) Can you help me? … read more
Daniel Wilson
Daniel Wilson
Auto Mechanics 1&2/diesel mech
6,890 satisfied customers
Got a 2009 mack gu713 when it gets hot and you shut it off
got a 2009 mack gu713 when it gets hot and you shut it off will crack for every and not start again only when hot not building fuel pressure let sit for awhile and cool off starts right back up … read more
Wayne
Wayne
Journeyman
Vocational, Technical or Trade Scho
2,892 satisfied customers
My 2005 cv713 Mack roll-off with 427 Mack overheats on hot
my 2005 cv713 Mack roll-off with 427 Mack overheats on hot humid days clutch fan seems does it sound like radiator should be head gasket was done approximately 5000 miles ago not losing any fluid but … read more
Daniel Wilson
Daniel Wilson
Auto Mechanics 1&2/diesel mech
6,890 satisfied customers
04 mack the ac fan switch has up, how do I jump the wires to
04 mack the ac fan switch has burnt up, how do I jump the wires to make the ac fan work? … read more
Daniel Wilson
Daniel Wilson
Auto Mechanics 1&2/diesel mech
6,890 satisfied customers
Can you help me with the torque specs bottom end and top end
Hi ,can you help me with the torque specs bottom end and top end for E7-460 mack engine … read more
Wayne
Wayne
Journeyman
Vocational, Technical or Trade Scho
2,892 satisfied customers
Need a diagram of fuse positions and what they are for..1998
need a diagram of fuse positions and what they are for..1998 Mack rd690 E-7 … read more
Jeremy
Jeremy
Certified Truck/Bus Technician
Associate Degree
2,243 satisfied customers
I hav a 07 cv713 mack with 400hp. I hav no power and it
I hav a 07 cv713 mack with 400hp. I hav no power and it strains so that it runs 210 heat … read more
Daniel Wilson
Daniel Wilson
Auto Mechanics 1&2/diesel mech
6,890 satisfied customers
I have a 99 mack stuck in gear. i took shifter out and look
i have a 99 mack stuck in gear. i took shifter out and look like the fork is good but the trans is still in gear … read more
Daniel Wilson
Daniel Wilson
Auto Mechanics 1&2/diesel mech
6,890 satisfied customers
My 671 in a old New York Garbage truck will die and start
My 671 in a old New York Garbage truck will die and start right up after 30 minutes of use. Oil pressure and temp good. All I have to do it press the start switch it will run if I moving.… read more
Curtis B.
Curtis B.
Technician
Associate Degree
991 satisfied customers
I have a Mack With a L 7 460 hp engine. It runs great, but
I have a Mack With a L 7 460 hp engine. It runs great , but when starting out it puts out white smoke with each of the first 3 0r 4 shifts. No smoke at all when just running even at high rpm. What is … read more
Wayne
Wayne
Journeyman
Vocational, Technical or Trade Scho
2,892 satisfied customers
my mack truck has an automatic eaton transmission with a clutch,
my mack truck has an automatic eaton transmission with a clutch, when the truck is shifted to neutral and put back in second or first gear it wont engage and the gear number shows up along with 3or 4 … read more
Andy3221
Andy3221
truck /coach technician
Vocational, Technical or Trade Scho
222 satisfied customers
I have a mack midliner g260. I cant find info on tappet adjustme
I have a mack midliner g260. I can't find info on tappet adjustment any where. Can you help?… read more
Toby
Toby
Vocational, Technical or Trade Scho
107 satisfied customers
Hello, we are a water well drilling business located in southern
Hello, we are a water well drilling business located in southern New Jersey and are in the process of purchasing a new drill rig and have options on trucks. We will need a tanden full screw truck with… read more
Wayne
Wayne
Journeyman
Vocational, Technical or Trade Scho
2,892 satisfied customers
Can you time an older em7 mack engine without using the A/B
Can you time an older em7 mack engine without using the A/B light? Dont have the 450 dollars at the moment and really need the truck running. Have already put the flywheel markings on the bell housing… read more
Wayne
Wayne
Journeyman
Vocational, Technical or Trade Scho
2,892 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