How JustAnswer Works:
  • Ask an Expert
    Experts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional Answer
    Via email, text message, or notification as you wait on our site.
    Ask follow up questions if you need to.
  • 100% Satisfaction Guarantee
    Rate the answer you receive.
Ask GM Tech (Cam) Your Own Question
GM Tech (Cam)
GM Tech (Cam), Chevy Technician
Category: Chevy
Satisfied Customers: 29355
Experience:  GM Grand Master Technician 2007. 14 years experience.
Type Your Chevy Question Here...
GM Tech (Cam) is online now
A new question is answered every 9 seconds

2005 Chevy: Duramax LLY, changed head gasket..Blown head gasket

This answer was rated:

2005 Chevy Silv. Duramax LLY, changed head gasket on right side, because of pressure in water system. Blown head gasket. on rear cyl. back together starts and runs, but will not go over 2000 rpm in gear, blows black if you try to accelerate.
Hello, I'm Cam. Please include all the details about your issue so I can accurately advise you. I cannot see your vehicle so please be detailed.
What codes are set?
Did you check the charge air cooler lines and the turbo connections?
Customer: replied 5 years ago.

Cam, Gm Tech

This morning started truck left idle for a few minutes then drove down street with no apparent problem, trans was not in a limb mode. seem to run ok a little sluggish.

stopped after mile and then restarted and proceed another 4 miles shifted OK thru all gears. Picked up a fuel filter (WIX 33960) and new air filter to change. came back to shop changed fuel filter and air filter, sprayed MAP with a cleaner. finally got fuel back in system and started when for test ride and it acted like it did last evening. went into a limb mode and proceed to blow black smoke out tail pipe, drove approximate 1/4 mile returned to shop no codes set. motor idles smooth will free rev to 3500 blow some extra smoke. {Yesterday afternoon there was a P0700 set. but it got cleared.}

Disconnected batteries for about 5 minutes and reconnected, did another test drive. same problem.

this problem appeared after we removed right head and replaced head gasket that allowed pressure to enter the water system. (Had a broken fire ring on number 7 cylinder) which pressurized the system. Since head gasket has been replaced and running of motor there is "no" pressurizing of water system. Top radiator hose is in a relaxed state after motor cools down. Problem solved. But now we have a fueling problem, Have checked the wire harness at alternator for bare wires OK.

Have not checked #2 or #7 injector wire harness.

May have to go to a dealer and have service mechnic check system with a Tech 2?

hoses and clamps to and from inter cooler are tied and in place. clamp at input to turbo seems to be in its proper place. Thank you for your help, I'm not at a computer 24 by 7

so bear with me computer is at shop not at home. will check for answer or suggestions in trying to resolve this problem.


If the only code was the P0700 then all that means is there is a code in the transmission computer.
If you had problems with 2 and 7 you would get codes like P0202, P0207, P2146 and P2149.
Did you get all the grounds cleaned?
Does your scan tool show balancing rates?
Customer: replied 5 years ago.


No scan tools does not have that function. Do not have codes that point to 2 and 7. What grounds are you refiring to?


All on the engine that you may have touched. What I am suspecting is that the lines had some debris in them that caused this. Balancing rated would show if any were low or high.
Customer: replied 5 years ago.


Ok It may possible that the 4 injectors and lines that I remove could have got some dust or dirt in them. Does that mean I will have to remove injectors and send them out and have them refurished. Thats after I have balance check done. What scan tool would I need to do a balance test?


Any advanced scan tool should be able to do this.
It is possible and they may need to be sent out, but lets look at the rates first. Why spend money we don't need to.
GM Tech (Cam), Chevy Technician
Category: Chevy
Satisfied Customers: 29355
Experience: GM Grand Master Technician 2007. 14 years experience.
GM Tech (Cam) and 3 other Chevy Specialists are ready to help you
Customer: replied 5 years ago.


Have to apologize that I didn't get back to you.

Was unable to find the problem last Saturday. came back on Sunday afternoon and reread your suggestions. said check air charge lines!!!!!!! so proceeded to disconnect

hose clamp before the intake. started to remove hose and then it fell away. Looked and saw that the pipe had been forced out of the hose on the exit of the inner cooler.

Being a very observant individual, I reattached pipe and clamp. Test drove truck, every thing was back to normal. I guess the reason I didn't see that the pipe had slip out it is below the air box and is difficult to see. plus i was thinking that it was something to do with the injectors or ECU.

If there is a next time have to remember to check the simple things first

Ran truck this past week with "no problems."

Thank You


Thanks for using Just Answer. If you want me to answer your next GM or GM product question, please put "For GMTECH Cam to Answer" and I should get it. Thank You!!

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... seen a spike since October in legal questions from readers about layoffs, unemployment and severance.
Web sites like
...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:

  • I was having a terrible problem with the wheel bearings on my 98 Chevy Cavalier and I suspect that using this website saved me plenty of time and money. Todd L Rochester NY
< Previous | Next >
  • I was having a terrible problem with the wheel bearings on my 98 Chevy Cavalier and I suspect that using this website saved me plenty of time and money. Todd L Rochester NY
  • 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!!!! Alex Los 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. GP Hesperia, CA
  • I couldn't be more satisfied! This is the site I will always come to when I need a second opinion. Justin Kernersville, 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. Esther Woodstock, 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. Robin Elkton, Maryland

Meet The Experts:

  • GM Tech (Cam)

    GM Tech (Cam)

    Chevy Technician

    Satisfied Customers:

    GM Grand Master Technician 2007. 14 years experience.
< Last | Next >
  • GM Tech (Cam)'s Avatar

    GM Tech (Cam)

    Chevy Technician

    Satisfied Customers:

    GM Grand Master Technician 2007. 14 years experience.
  • Tim's Auto Repair's Avatar

    Tim's Auto Repair


    Satisfied Customers:

    Have owned a repair shop for 25 yrs.
  • Gary's Avatar


    Chevy Technician

    Satisfied Customers:

    15 years GM master tech
  • Dave Nova's Avatar

    Dave Nova

    Chevrolet Technician

    Satisfied Customers:

    ASE Master Certification. GM World Class Certification
  • John's Avatar


    Master A.S.E Automotive technician

    Satisfied Customers:

    A.S.E MasterTechnician A1-A8 w/L1,38 years experience General Motors Master Technician
  • Don 'Mo Lurch''s Avatar

    Don 'Mo Lurch'

    Auto Mech / Electronics

    Satisfied Customers:

    Chevrolet Cert., Heavy Line Mech, Race Shop Owner, Mobile Electronics.
  • Ron Z.'s Avatar

    Ron Z.

    - Chevy Tech -

    Satisfied Customers:

    18+yrs experience. State Inspector and Chevy Diagnostics