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  1. 4

    4.3 liter heavy duty version

    Ive had quite a few GMT400's...and been around even more, I called a buddy just now that has a GMT400 parts yard he keeps up for himself and friends...and he said hes never heard of such a thing, but did say that Fleet orders could be had in all kinds of weird setups, so he said it is very...
  2. 4

    Thermostat Education for 1998 k1500 Suburban

    Ive seen it both ways...But, if all is working right, its normal for a gauge to go up to the point of Tstat open temp...say 195-200...then cools some, as the cooler water hits it...then warm back up. Ive got one truck that the gauge will move between 2 lines all the time..new radiator, hoses...
  3. 4

    Questions about swapping a 454 to a 350

    200K on a 454 aint bad...lol. I had 251K on my 97 K3500 Dually, it had spent its life heavy hauling and was all original, and it didnt smoke, knock, use oil, or leak. Personally...Id find as low a miles 454 and drop it in, the power difference is amazing. Fuel consumption...is a bit more, but...
  4. 4

    Whats the Diff between STD Water pump and HD water pump?

    My 97 K3500...pretty sure it has a chewed up WP impeller...im looking at new pumps and it says there was a STD duty pump, and a HD pump, but does not reference RPO codes or physical differences...anyone know what the difference was?
  5. 4

    Low oil pressure in my 94?

    My 95 K1500 has a Crate 350 with all new sensors, senders, etc installed at time of swap...about 35K on it all, I get about 65psi on startup, and 30 idling in gear, 35-40 in park, hot... At around 3500 miles on the oil change, It will start to fluctuate both while driving and while...
  6. 4

    TBI 454...Pedal floored, wont rev past about 2500? (video)

    I have a spare idientical ECM that has proven to work perfectly on another truck, it made no difference. The eprom is an updated reflash of the original BIN file, the original eprom was faulted and would not allow it to idle down, I suspect someone had tried to custom tune it and messed it all...
  7. 4

    TBI 454...Pedal floored, wont rev past about 2500? (video)

    Well, ben about a year...still doing it. I bought a K3500 CCLB dually and been enjoying it and the other 2 trucks without a single problem...came back to this truck, and its still doing the same crap as before. Ive decided that, it isnt fuel related, in the sense of demand, or supply...as I...
  8. 4

    TBI 454...Pedal floored, wont rev past about 2500? (video)

    Nope, it just fixed itself pretty much. I parked it for like 2 months...One day I went out to check it out..it started right up, idled down, i took it out on the road and made a WOT pull through 2nd gear and it was smooth as silk. Im actually, right now, in the process of installing a Ranch...
  9. 4

    350 throttle body questions.

    On a TBI engine, the 1" spacer allows more time and turbulence to better atomize the fuel. It also adds plenum volume, which helps torque. Too mcuh plenum volume...however, can have negative effects. 1" is tried and trued.....if more than that had an advantage, thats all we would see.
  10. 4

    Pros and cons on 6.5 diesel

    My GM4 very readily and willingly spins up 14+ PSI...Ive got the TM turned way down because when I installed my gauge, it was burying the 15psi gauge and holding it "wrapped". I dont see the other issues folks seems to have, like overheating, its never gotten over 195*...even towing, in late...
  11. 4

    Pros and cons on 6.5 diesel

  12. 4

    Pros and cons on 6.5 diesel

    I bought my 1995 K2500 6.5 TD about 5 months ago, 126K miles, very well cared for mechanically, not perfect...but I paid 3500 for it, got it home...did the oil/filter, fuel filter, air filter, Lift pump wasnt working..so i put a new oPS on it, and did the relay mod so it will never need it ever...
  13. 4

    TBI 454...Pedal floored, wont rev past about 2500? (video)

    I got the 02 sensor in this morning...dang connector was right up on top of the trans housing...stupid design. No change i could feel, I also fixed a stripped battery terminal, no change. TPS tested good but i have a brand new AC Delco one that is on its way, and a new delco CTS. The new...
  14. 4

    TBI 454...Pedal floored, wont rev past about 2500? (video)

    Ive had both covers off, inspected springs, rockers, bolts, and had the intake off..checked all the rods...all felt fine. compression test was good on all 8, less than 5% spread hi to low. Ive got a brand new one to put on but I cant reach the dang connector..it up in the freakin tunnel.
  15. 4

    TBI 454...Pedal floored, wont rev past about 2500? (video)

    Ive had both covers off, inspected springs, rockers, bolts, and had the intake off..checked all the rods...all felt fine. compression test was good on all 8, less than 5% spread hi to low.
  16. 4

    IAC Valve Question

    I had a very similar problem to yours on my TBI 454....and my high idle problem (after replacing everything, computer and eprom included..alot of $$$), ended up being a loose intake manifold. 8 bolts on each side of a big block...and on the drivers side, 3 of the 8 were loose, 2 were so loose I...
  17. 4

    IAC Valve Question

    My 94 K1500 with the same setup idles at 550 in gear HOT, and cold is about 800 in park. Something to check...there may be a vac fitting on the back of the TB, between the 2 fuel lines...if its not in use, it will be capped, make sure the cap isnt split open or missing.
  18. 4

    TBI 454...Pedal floored, wont rev past about 2500? (video)

    Ive had..alot of problem with my K3500 Silverado, have yet to tag it..in 10 months of ownership, ive got 2-3 other trucks I can drive daily so its been a project... First things first...its a 151K mile, K3500, with the TBI 454... My problems at first were, it refused to idle down under...
  19. 4

    another problem with the 6.5 diesel

    PMD...Its so common that most people keep a junkyard spare in the glovebox...just in case. I relocated mine to the front skid plate with the HEATH kit...so far, a year later, no problems.
  20. 4

    4L80E behind 6.5 Turbo Diesel, not downshifting out of OD when going up a hill

    I still have a vacuum pump on mine, dunno if it works, but the controller and stuff is all gone, personally Id prefer it to be there, im not a fan of the turbo master. Seems like it lets boost bleed off, vs holding it shut tight, then blowing off at X psi.
  21. 4

    4L80E behind 6.5 Turbo Diesel, not downshifting out of OD when going up a hill

    So basically, i need a tune...? That sucks, but it is what it is. Id expect that the TCC would unlock when the throttle was touched, like on a gasser...but this one holds until the kickdown, its got ot be hell on parts.
  22. 4

    4L80E behind 6.5 Turbo Diesel, not downshifting out of OD when going up a hill

    Its got a turbomaster (a real one) and the spring is turned down to about 2.0 inches, it doesnt get to 12..it climbs to about 8-9-10...11...then pops off and falls to about 8. PErsonally, I originally thought that the WG valve was sticking, it builds boost so slowly.... Its got a 4" Diamond...
  23. 4

    4L80E behind 6.5 Turbo Diesel, not downshifting out of OD when going up a hill

    Econo tune sounds likely, in the 2 months Ive had it, Ive found it lacks power...like as soon as it makes boos,t it defuels. Ive got a gauge on it now, and with 31" tires, if I punch it off the line, it revs some, and makes boost, in fact..nearly 12psi of boost (nearly), and launches hard...but...
  24. 4

    4L80E behind 6.5 Turbo Diesel, not downshifting out of OD when going up a hill

    1995 K2500, runs great, shifts great....if I am running along at 55mpg, in OD...and I come to a hill, it starts to lose speed if I dont give it pedal obviously...as you would expect. But...I pretty much have to floor it to make it kick down out of OD to let the engine rev/make boost if im...
  25. 4

    engine bay clean up

    What i do is Simple gree Automotive, 15 minute soak....then power wash...let it sit in the sun for about 30 minutes, then attempt to crank. If it starts, let it idle for a bit to dry up. If not..let it sit some more. Dont force water into the alternator, starter, or intake... Ive got Chrome...

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