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  1. S

    Duramax surging at hwy speeds.. NEED HELP!!

    Another update, unplugged the MAF sensor same surge same speed, pulled the air filter, same surge same speed, just out of curiosity at this point could the fan clutch be locking up at this certain speed, im running out of thoughts and ideas!!!!!!
  2. S

    Duramax surging at hwy speeds.. NEED HELP!!

    ive put a pump and FPR on mine and still the same problem, that was the first thing i did
  3. S

    Duramax surging at hwy speeds.. NEED HELP!!

    wouldnt it run worst with it unplugged under load
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    Duramax surging at hwy speeds.. NEED HELP!!

    not yet
  5. S

    Duramax surging at hwy speeds.. NEED HELP!!

    Got the fuel leak issue solved with new injectors but still have the surge at the same speed, anymore ideas?!?!
  6. S

    Duramax surging at hwy speeds.. NEED HELP!!

    I'll keep ya guys posted thanks for the help
  7. S

    Duramax surging at hwy speeds.. NEED HELP!!

    Found the leak, looks like a cracked injector body, time to replace all 8
  8. S

    Duramax surging at hwy speeds.. NEED HELP!!

    I put all the bolts in first then put the line on
  9. S

    Duramax surging at hwy speeds.. NEED HELP!!

    It's parked right now, I've ran ground cables directly off both batteries to the block and still the same issue, and no codes what so ever, no trans codes, no engine codes and I know it will flip a code if a fault is found.. It's got me beating my head against the wall
  10. S

    Duramax surging at hwy speeds.. NEED HELP!!

    The regulator is new came with the cp3 and the truck does not have a tune, I could live with a pulse but this a 100-300rpm surge and only at 100km/h and above
  11. S

    Duramax surging at hwy speeds.. NEED HELP!!

    I re-used all the o-rings and copper washers just pulled the injectors followed merchant automotive cleaning steps and like I said torqued everything back down to factory specs, the truck never had any fuel in the crankcase before I clearly created an issue with it but it is still surging and...
  12. S

    Duramax surging at hwy speeds.. NEED HELP!!

    So what your saying is tear it back down!! also what are some ways to determine where the leak is coming from once i get the covers off
  13. S

    Duramax surging at hwy speeds.. NEED HELP!!

    heres the latest and greatest now, pulled the injectors due to the common lb7 line corrision and there was lots of debris on the top of the injectors figured it might be causing my surging issues and it needs to be cleaned anyways, so cleaned the injectors, hard lines, return lines, replaced all...
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    Duramax surging at hwy speeds.. NEED HELP!!

    Well guys, heres another update, installed the fuel filter head rebuild kit today and still the same promblem, talked to the guys at merchant and kennedy and they said what i did with putting the cp3 in is what they would of done with this kind of sypmton, starting to beat my head against the...
  15. S

    Duramax surging at hwy speeds.. NEED HELP!!

    The air filter and fuel filter are new as well, i did a balance rate on the injectors and they seem to be good, any other thoughts....
  16. S

    Duramax surging at hwy speeds.. NEED HELP!!

    Is it possible for the fuel filter housing to cause this issue?
  17. S

    Duramax surging at hwy speeds.. NEED HELP!!

    Ive never done a return test on it, and would be curious on how that is done?? also when it surges it feels like it loses power than comes right back, thanks again guys
  18. S

    Duramax surging at hwy speeds.. NEED HELP!!

    the pressures seem to be good, what should i be watching for on the balance rates
  19. S

    Duramax surging at hwy speeds.. NEED HELP!!

    Hows everyone doing.. I have a 2002 chev silverado 3500 with a duramax, the truck drives beautiful below 90km/h anything above that it starts surging and gets very pronounced on the hwy, it does not surge at idle the truck has a new injection pump and regulator 500km ago it did it before the new...
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