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  1. R

    Please help just replaced fuel lines fuel cooler and filter housing

    I don't think I've ever heard of testing the fuel supply side by vacuum, but why not? A small vacuum pump capable of 10 lbs is applied to either side of the fuel filter and see if you get bubbles. Depending on which side of the fuel filter you attach the vacuum to, you will be testing for leaks...
  2. R

    Please help just replaced fuel lines fuel cooler and filter housing

    I'd keep pushing the primer button and see if you can let some of that air out. It make take 10 or 20 or 30 pumps. Helpful to have a helper; one to turn the key, one to pump the primer
  3. R

    LB7 DIC MPG

    Does B0781 just affect the DIC MPG? nothing else? And what variables does it consider? Just trying to learn a little.
  4. R

    possible clock spring failure?

    Clockspring would be my guess also
  5. R

    Injector voltage issue

    It's hard to tell what may be happening to your truck. Having a scan tool surely makes the job much easier. . The links below may provide you with some information that makes sense in your situation, but maybe not. Check to see if any injectors are shorted. Shorts can happen in cold weather but...
  6. R

    Limp mode

    Did you clear the codes, or did you just expect them to clear on their own? If you cleared them, then took key out (not always necessary but maybe) and then back to on, then rescan that may get the job done. Electrical devices always require a complete circuit with correct voltages and...
  7. R

    Truck lost communication with TCM.

    You may or may not need a new/repaired TCM. The 1st thing to do is to make sure the TCM has power and is grounded. You will need a wiring diagram and a test light and DVM. If you aren't comfortable with doing the work yourself, you will need a shop to determine if the TCM is really dead. It is...
  8. R

    P0089 Code

    Maybe some information in the attachment will help. Probably don't need to read further than page 3
  9. R

    Truck starts up but doesn’t shut off without pulling fuse under the hood!! HELP!!!

    Your 'plug' was for the block heater?? or something else ??
  10. R

    Lml no start after regulator removal

    Josh - you read the link but don't think it is correct/ or ?? Maybe you are just making an additional statement?
  11. R

    Lml no start after regulator removal

    See here: https://oregonfuelinjection.com/services-repair/diesel-diagnostics-repair/chevy-gmc-diesel-diagnostics/#07.5 There are some specifics o check for P0191. You probably already know all of this, but it's a goo review if nothing else.
  12. R

    no ecm/tcm communication

    The best way to check is with an oscilloscope, but it's unlikely you have that. See if there is any voltage at all. If they're dead, that's not good. Or at least make sure they're not broken, and have continuity., try a test light with low-watt bulb.
  13. R

    Lml no start after regulator removal

    The truck thinks the problem is the circuit for the #2 regulator. What check on the circuit was done? If you're satisfied with that, there must be another problem yet to be discovered. The attachment is specifically for my 2008 LMM, but the problem is similar for the LML also.
  14. R

    no ecm/tcm communication

    The first check is to see if the ECM has powers and grounds You need a wiring diagram to see which pins on the ECM are power or ground. Also need to check the communications lines. Your ECM needs a complete electrical circuit and some communication also. GMUPFITTER publishes ELECTRICAL manuals...
  15. R

    LMM code P0299

    Soapy water in a squirt bottle works just fine.
  16. R

    Glock RMR Milling Alternative

    Nice work. Which Glock model is that?
  17. R

    Alternator????

    The engine trans, exhaust could be causing/contributing to the noise I once had a bolt that I had 'lost' in the engine about 2 years previously end up at the damper and would make a strange noise as the engine ran, Strange things happen.
  18. R

    Alternator????

    I 2nd Jason's idea of removing the belt and seeing if the noise goes away. If it does, the noise is from something the belt is turning or the belt itself.
  19. R

    Blockheater tripping gfci

    And having 2 GFCIs in the circuit causes unwanted tripping.
  20. R

    Electrical Problems

    https://www.tsbsearch.com/Chevrolet?Page=156 Scroll down to the bottom and enter your DTC and Chevrolet https://www.dtcdecode.com/Chevrolet also check here Checking for power/ground is like checking battery voltage - one probe on the + side, the other on the - side. Of course, you have to...
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