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  1. Hartwell

    obd1 code 22 Throttle Position Sensor

    Haven’t been on the forum in a while as this semester has kept me busy, so I apologize if I’ve missed some responses on my other posts. Unfortunately with the new year a new code has come up on the burb. Code 22, throttle position sensor. I was previously dealing with a code 35 i believe the...
  2. Hartwell

    7.4L backfire under load

    Alright so here’s the deal. I’ve got a 94 k2500 burb with the 7.4 tbi. About a month and a half ago i started having misfiring issues. Did the distributor cap, rotor, wires, and plugs. Adjusted the timing as you should with a tbi (warming it up, unplugging the computer under the glove box...
  3. Hartwell

    7.4 tbi backfire under load

    Alright so here’s the deal. I’ve got a 94 k2500 burb with the 7.4 tbi. About a month and a half ago i started having misfiring issues. Did the distributor cap, rotor, wires, and plugs. Adjusted the timing as you should with a tbi (warming it up, unplugging the computer under the glove box...
  4. Hartwell

    What is this vacuum connection

    I suspect this connection (yellow) may be one of the causes to my misfire/timing problems on my 7.4 burb. I didn’t notice it because there was no hose or anything. my question is, is there supposed to be a hose there and if so where does it lead? If not, do i plug it? I ran some vapor through...
  5. Hartwell

    7.4 tbi timing issue

    my ‘94 7.4L tbi burb has been running real rough lately. It misfires/shudders badly and won’t accelerate quick at all. So far I’ve replaced the plugs, wires, cap, rotor, pcv valve and fuel filter and it hasn’t solved anything. I checked the vacuum lines and they’re all good. When I went to...
  6. Hartwell

    AC making noise near evaporator core

    I don’t know much on how the ac system works but i recently used my ac for the first time in a while because only my front ac works because i’ve yet to replace the rear expansion valve and now it makes a tapping noise under the dash where the evap core is every time i turn the car off or on...
  7. Hartwell

    hydroboost/power steering line leak

    I’ve got a 94 k2500 with a 454 with the hydroboost setup. Ever since I bought it back in march, the thing’s been going through ps fluid like crazy. Been trying to source the leak but every time I clean the lines, they all just get dirty again with fluid on the fire wall under the hydroboost...
  8. Hartwell

    K2500 Burb exhaust

    I’ve got a ‘93 454 burb I wanna redo the exhaust on. Thinking a cat delete and a mangaflow with some mid length headers. Will the mid length headers cause clearance issues? Will i need a tune after the cat delete? Should i run true dual? thanks Sent from my iPhone using Tapatalk
  9. Hartwell

    Muffler for 454

    I got a 94 burb with a stock 454 and i wanna re do my exhaust. The sound i’m looking for in a muffler is like a deep like a smooth purr/growl not like the crackly obnoxious sound. Don’t get me wrong i love that the sound of a crackly beefy v8 but on trucks. Just doesn’t fit on a burb if ya ask...
  10. Hartwell

    size of 4x4 decal

    I wanna get a set of the 4x4 decals for my k2500 burb but idk what size to get. Can someone measure theirs and tell me it in inches? thanks Sent from my iPhone using Tapatalk
  11. Hartwell

    305 to 350 swap

    What all needs to be changed and what all can be swapped over to the 350? Trying to do this as low buck as possible. I have a 93 Sierra Sent from my iPhone using Tapatalk
  12. Hartwell

    5.0 to 5.7 swap?c

    I have a 93 305 and wanna swap in a 3 Sent from my iPhone using Tapatalk
  13. Hartwell

    Looking for cassette player

    Really like the OEM cassette deck/radio/booster look. Wondering if anyone has any of these they’d like to let go of (working condition of course). If not anyone know of a head unit that plays cassettes that’ll fit? Thanks ‘93 Sierra Sent from my iPhone using Tapatalk
  14. Hartwell

    How to identify 350

    I️ believe I️ have a 350 in my 93 sle but I’m not sure. I️ measured the harmonic balancer and it is 8”. I️ just started driving this truck within the last year and am not sure where to check for block numbers and I’m not particularly fond of taking the heads off to find out. Any replies would be...
  15. Hartwell

    What headers do you run?

    I’ve got a ‘93 sle and am searching around for some headers and was wondering if any of y’all are still running the stock ones or what. Thanks Here’s my exterior progress so far Sent from my iPhone using Tapatalk

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