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  1. t_ahan

    Best coil pack replacement?

    like SLCHOE said: a smoke test will help find air leaks to confirm if u do or dont have any. and once that test is done scratch it off the list. MY MISFIRE STORY: P0300 was the only code ....i had to run through the misfire diagnosis check list about 3 times till i fully diagnosed my misfire...
  2. t_ahan

    EXPERIENCED HELP NEEDED!!! fuel injector fine tuning

    i always felt the bottom end suffered but blamed it on being a big heavy truck and not the tc or mis match set up... but wow even with the lack of fuel it has a top end that loves to pull deep into the deadly mph range. the truck is great for hwy pulls! but thats all lol so it sounds like...
  3. t_ahan

    EXPERIENCED HELP NEEDED!!! fuel injector fine tuning

    i apologize if i came off wrong. and gave the impression that i know exactly what i am doing. i will give alil intro of my self to the community since i dont think have really ever formally done that and am now seeking the help of the vets here! i was looking for this kind of feed back! good...
  4. t_ahan

    EXPERIENCED HELP NEEDED!!! fuel injector fine tuning

    i was hoping u would chime in !! yeh i will probably do the 8.1L since you will be doing the tuning! Justin had mentioned that he already has the specs for them to add them to my tune file. it seems that would be easiest route. now as far as fuel pump goes do u think i need to plan for that?
  5. t_ahan

    EXPERIENCED HELP NEEDED!!! fuel injector fine tuning

    need some input and advice to start addressing the much needed fuel system upgrades... so i am looking to get new injectors and a fuel pump (if necessary since mine my oe still has not burned out) When i did my build i knew injectors would be needed but with my light/break-in feeler tune i...
  6. t_ahan

    Shaking while accelerating

    interested to hear if any1 has figured this out yet!?
  7. t_ahan

    Tank range

    225 miles city/hwy 93 octane best ive done with the current motor build was 345 miles. i will try to see how much better i can get i mostly see 5-7 mpg city, 12-15 mpg highway.(heavy on the throttle,i know!) 03 denali with the usual;) - 22"x12"wide SS Reps(pretty heavy) only thing left oe...
  8. t_ahan

    Whirring Noise

    not sure if this helps but with my 03 denali (awd), there is a GM additive that is required to be used when filling the diffs...also check your bearings, with bad wheel bearings sometimes you can get the noise to change pitch by swaying the vehicle slightly to the right and left while driving...
  9. t_ahan

    Red Spark Plug Insulator??NO CODES/Slight Misfire

    03 Denali LQ4 block: recently built now 6k mileage. studded, forged and bored bottom end...studded/slightly worked 243 heads, mild cam, comp valve terrain, msd coils w/relay harness, o.e. acdelco plug#/wires, FAST LSXRT w/FAST rails,aeromotive regulator, and i know i need better injectors but...
  10. t_ahan

    can not break in motor cuz misfires

    ...u think I should really just drive it for break in?this does makes more sense , but I was trying to follow what the machinist recommend as he was the builder and I didnt want it to blow up and him just laughing sayin did u do what I said!? do engine dyno break/run in procedures have that...
  11. t_ahan

    can not break in motor cuz misfires

    Yeh I wasnt really stressing the cam since I did the prelube for first start , I just didn't want to take any chances .....so my machinist did not give any mileage specs and just said to change the break in oil after 2hrs od run time once I do the few things he said (once she warms up n...
  12. t_ahan

    can not break in motor cuz misfires

    I have them in my cart..mainly cuz ihavw a magna cat back already installed! Just need to call up the vender to verify the part# I have is the direct fit federal set
  13. t_ahan

    can not break in motor cuz misfires

    Well I found my problem! And am shopping for a set of cats but can not make up my mind on what to get......any suggestions from my fellow community members!? Thanks
  14. t_ahan

    Misfire Cylinder 3 and PO200 Codes

    I just went through misfire diag. N after checking everything and not finding any faults I pulled the injectors for flow and leak testing cuz I found when I pinch the fuel return n feed lines I still drop pressure out of spec and the regulator(aeromotive#13301) was not leaking and they have...
  15. t_ahan

    can not break in motor cuz misfires

    Bump! Please give your suggestions Thanks
  16. t_ahan

    can not break in motor cuz misfires

    Yeh that's what I thought :( And yes she cranks right up ! Msd starter n red top battery seem to spin it up quicker than n b4 and sounds strong, healthy, smooth on cranking. The misfire counts go up right after pcm commands tb for idle then she starts with sputtering but stays alive on like 5...
  17. t_ahan

    can not break in motor cuz misfires

    I really hope not..I did it by the book, prelube right b4 1st start and oil pressure was normal. how else can I in verify ?
  18. t_ahan

    can not break in motor cuz misfires

    Yes, at one point I thought I had an exhaust valve stuck open which is kkinda what the misfire sounds like through the intake manifold (FAST lsxrt) but its been so long I cant remember if thats just the way it sounded. I think I am going to add a leak down test to my list cuz I guess...
  19. t_ahan

    can not break in motor cuz misfires

    Hello every1. I finally got around to firing up my rebuilt 6.0 lq4 after having it bored for new pistons . Upon first start I was happy to hear the motor sounding smooth but had a manifold leak. I ran it for no more than 2min. Fixed the exhaust leak , fired it back up and let it run alil...
  20. t_ahan

    question: lsxrt w nw102mmtb related

    i am almost ready to fire the motor for the first time this build!!! jus need to flush the oil cooler line and replace the FAST tb plate or replace the helicoil that sprung cuz the tangs were never punched . im going to run the factory tune for now but i still want to accomplish everything...
  21. t_ahan

    question: lsxrt w nw102mmtb related

    thanks for the setup tip z56hoe!!! im going to contact them to see if they can help me out with options for tunning bump! any1 else have anything they could plz share !?
  22. t_ahan

    question: lsxrt w nw102mmtb related

    I was hoping some1 could steer me in the right direction on this one...here it is...I cant make up my mind on to run my current set up or get a nick williams 102mm tb and xlink harness. Its 2003 gmc yukon denali awd 6.0l lq4 fresh from the machine shop with a .030 over bore with Wiseco forged...
  23. t_ahan

    Time for a 0.030 over bore!!

    LQ4 built n/a quick build history 70k miles lq4 with stock 4.000" bore when pistons n rods were installed....story goes!!!...i had accumulated over the last 4 years everything for the build and wasnt really ready to put it all together but the transmission went out n i ordered up a...
  24. t_ahan

    Time for a 0.030 over bore!!

    anybody out there????? i c that people r checking this situation out but nothing being discussed yet:think: i also have to deal with finding out how to better tune this truck other than diablo sport predator and hp tuner....i feel im ganna need to dyno tune but cant find any1 in the are that is...
  25. t_ahan

    Time for a 0.030 over bore!!

    phase 4 build (blown)

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