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Related Medium and Heavy Trucks Questions
I have a 2003 Mack Mr e-7 Two questions. Engine position
I have a 2003 Mack Mr e-7 Two questions. Engine position sensor code coming up. How can I test if sensor is bad or not getting enough volts to sensor using a multimeter. Also the fan clutch on 2007 Ma… read more
Mike Mcmillan
Mike Mcmillan
Shop Foreman/Triage Tech
Associates
6,613 satisfied customers
Needed answer on engine position sensor checking.2003 Mack
Needed answer on engine position sensor checking.2003 Mack MR Trouble code says erratic data from sensor How many volts should be going to sensor with key on? If correct volts to sensor, how would you… read more
Wayne
Wayne
Journeyman
Vocational, Technical or Trade Scho
5,115 satisfied customers
I have a 2003 Mack Mr garbage truck Code j1708/j 1587 keeps
I have a 2003 Mack Mr garbage truck Code j1708/j 1587 keeps coming up data link VECU by vmac111 scanner. These I believe are the non critical data lines but evidently interfering with performance. The… read more
Mike Mcmillan
Mike Mcmillan
Shop Foreman/Triage Tech
Associates
6,613 satisfied customers
I have data link code coming up on 2003 Mack MR. VECU
I have data link code coming up on 2003 Mack MR. VECU 1708/1587 Tried and replaced ECM, vecu. Checked grounds, shook wiring every where. No impactStumbles some under strain and smokes occasionally fro… read more
Mike Mcmillan
Mike Mcmillan
Shop Foreman/Triage Tech
Associates
6,613 satisfied customers
I have a 2003 Mack Mr Runs good cold but stumbles when warm
I have a 2003 Mack Mr Runs good cold but stumbles when warm Trouble codes keep coming up data link VECU 1708 etc, power key reset, fan clutch out put below normal,engine position sensor,Replace fan cl… read more
Daniel Wilson
Daniel Wilson
Auto Mechanics 1&2/diesel mech
6,062 satisfied customers
I have 2003 Mack Mr E tech that trouble codes are coming up
I have 2003 Mack Mr E tech that trouble codes are coming up inactive with zero count. Fan clutch low output but fan clutch is viscous type manual with no wires or airlines connected to it or anything … read more
Wayne
Wayne
Journeyman
Vocational, Technical or Trade Scho
5,115 satisfied customers
I have a 2003 mack Mr e tech engine. Trouble code came up
I have a 2003 mack Mr e tech engine. Trouble code came up 4-2 fan clutch output low current,. Is the fan clutch bad because I don't see any electrical sensors etc. Seems to be mechanical fan clutch an… read more
Mike Mcmillan
Mike Mcmillan
Shop Foreman/Triage Tech
Associates
6,613 satisfied customers
Have a 2003 Mack Mr e tech 6 eups We swapped cam sensor from
Have a 2003 Mack Mr e tech 6 eups We swapped cam sensor from sister truck because code came on. same yr but not sure if takes. same amount if shims or if any. How would you figure out how many shims n… read more
Mike Mcmillan
Mike Mcmillan
Shop Foreman/Triage Tech
Associates
6,613 satisfied customers
Have 2003 mack truck. Mr model. Truck surges and misses
Have 2003 mack truck. Mr model. Truck surges and misses under heavy load at times and at 3rd or 4th shift consistently. Vmac3 scanner says sid 250 data link problem. Replaced ecm wire harness. No chan… read more
Daniel Wilson
Daniel Wilson
Auto Mechanics 1&2/diesel mech
6,062 satisfied customers
I have 2003 mack Mr trash truck Problem with truck surging
I have 2003 mack Mr trash truck Problem with truck surging and loosing power,stumbling going up hills under strain. Tried a lot- replaced no.3 rip and no.3 nozzle injector came up on scanner.installed… read more
JimmyM827
JimmyM827
Bobcat specialist
Automotive technologies
70 satisfied customers
I have a 2007 mack MR trash truck E 7 My question is some
I have a 2007 mack MR trash truck E 7 My question is some one wired the rev up switch toggle directly to ecm or VECU. The rev up toggle should shoot electricity to sensor that is iniated by handle On … read more
Mike Mcmillan
Mike Mcmillan
Shop Foreman/Triage Tech
Associates
6,613 satisfied customers
I have a 2003 mack MR truck. 2003 Mack Mr truck E-7 engine.
2003 Mack Mr truck E-7 engine. Problem with truck stumbling some. Inactive code keeps coming up no 3 eup. and data link. Active code is fan clutch output which I assume wouldn't cause truck not to take fuel at Times and then pkup again. I have replaced number 3 eup and injector nozzle. Also replaced transfer pump and cam sensor. Wiring seems good. 4 volts going to every eup and pulse is the same on every eup. Haven't programmed rip but was told rarely that is a problem and I have swapped eup before never a problem. I have. Good software that trouble shoots coded and solutions. At a loss. Have own macks. 30 yrs. … read more
Mike Mcmillan
Mike Mcmillan
Shop Foreman/Triage Tech
Associates
6,613 satisfied customers
I have 2003 Mack Mr truck and truck missing randomly. I have
I have 2003 Mack Mr truck and truck missing randomly … read more
Mike Mcmillan
Mike Mcmillan
Shop Foreman/Triage Tech
Associates
6,613 satisfied customers
Cooling fan wont disengage 2002 mack. 2002 mack rd688s e7
Cooling fan wont disengage 2002 mack JA: What's the make/model/year of your truck? Engine type? Customer: 2002 mack rd688s e7 inline 6 JA: Are you fixing your truck yourself? What have you tried so fa… read more
Mike Mcmillan
Mike Mcmillan
Shop Foreman/Triage Tech
Associates
6,613 satisfied customers
X. 2003 mack RD688s e7 etech 350 engine. Will not start, it
2003 mack RD688s e7 etech 350 engine. Will not start, it only cranks. I have eliminated any problem from the fuel tanks. I have a line running from a separate fuel container. I've replaced the Crank sensor and the Engine speed sensor. still no luck … read more
Mike Mcmillan
Mike Mcmillan
Shop Foreman/Triage Tech
Associates
6,613 satisfied customers
07 Mack MR688P trying to diagnose air operated radiator fan
07 Mack MR688P trying to diagnose air operated radiator fan clutch. Fan runs 100 % all the time, can ground solenoid and will shut off.… read more
Daniel Wilson
Daniel Wilson
Auto Mechanics 1&2/diesel mech
6,062 satisfied customers
g,day .I have CHR MACK VMAC2 having trouble with the viscus
g,day .I have CHR MACK VMAC2 having trouble with the viscus fan hub the orignal one is in all the time brought a new one it wont engage at all only when you first start it i,ve flushed radiator etc re… read more
Daniel Wilson
Daniel Wilson
Auto Mechanics 1&2/diesel mech
6,062 satisfied customers
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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.

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