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About sefiroxx

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  1. Theories: Problem occurs with both engines. Then wiring harness is likely problem. Boil some water, check temp, put sensor, connected, into water and check guage to see if matches temp of water. Or, measure resistance of sensor at cool temp and then check resistance of wire harness at other end (plugs into control). Heat in rear but not front. Air in the heater core and possibly elsewhere including around water temp sensor.
  2. 01 Suburban is rock solid. Fuel pump at 150, water pump and heater hoses at 200, kid blew the engine at 320. New rebuilt motor and still going strong. Lots of rear brakes.
  3. Check your rpo codes in the glove box. NW7 is the std traction control option.
  4. Most modern alternators have a regulator built into then. The regulator should never drop below 12v
  5. Throwing parts at it. . . Hiking something sticks. . Pull codes. See if any information only codes are set You are getting into 1st, so tranny and computer are talking. Could you get into 3rd after getting into 2nd? Ideally, you should get a tranny shop to do a diagnostic test, confirming that the computer is commanding gear shift and reading sensors. The computer uses inputs from sensors to determine when to shift gears. These include tech( rpm), tps (desired speed), vss (road speed). If these are not working or the computer can't see them, then the computer won't command a gear change.
  6. Alternator is probably on the way out. Take your battery in to be checked first.
  7. Be sure to let the truck return to idle when starting veggie shifting into gear. The high rpm on startup can 'slam' parts. As for the late shift, sounds like your 1-2 accumulator is leaking. Common problem with original parts.
  8. Had the same clunk on a rebuilt. Builder had installed an upgraded valve body that works better under higher load like faster acceleration. Typically, they install an upgraded 1-2 accumulator setup that stiffness the shift. You might have to , go back to original setup . Tune the computer to change the shift point . Modify the setup. You'll need to drop the 1-2 accumulator to see what was installed and what other have done (change springs, modify piston etch ' change pressure (which would change other shift points)
  9. Religion request, you might get all sorts of answers. Cooler Sun shell Sprag Planetary gear Valve body and valve upgrades Clutches Band Suggestion, get a second, dead unit, and do the rebuild with upgraded parts including new upgraded valve body. Quick swap and you are back on the road in 1 day. You can then work on the backup in spare time ( assuming you have a place to store it)
  10. Scroll to the vehicle fitment area: https://www.gmpartsonline.net/oem-parts/gm-bumper-impact-bar-15060470?c=Zz1ib2R5JnM9YnVtcGVyLWFuZC1jb21wb25lbnRzLWZyb250Jmw9MSZuPUFzc2VtYmxpZXMgUGFnZSZhPWdtYyZvPXNpZXJyYS0xNTAwJnk9MjAwNiZ0PXd0JmU9NS0zbC12OC1mbGV4
  11. Tsb came out updating my spark plug to iridium and changing the gap distance.
  12. Check your solenoid, sensors and wire harness. Do a search for 4l60e resistance chart. Also check that the nss is properly installed and connected.
  13. A)Do two fuel pressure leak down tests. 1) key on 5sec, key off, monitor 2) repeat, but with all injectors unplugged. If different results, then there is a short in the wire harness. B) check upstream o2 voltages and fuel trim to see if the rich condition is side specific. If side specific, it could be wire harness that side or cylinder specific on that side.
  14. Rpm's combined with torque create harmonic vibrations, so the right harmonic only occurs at certain speeds/gears
  15. The seller has probably drained the tranny, but old fluid can be found in nooks and crannies, and especially in the convertor. Pull pan, inspect pan, and the wire harness. Replace filter, gasket, seals. Install, add new fluid. Disconnect upper radiator tranny cooling line. Connect tranny hose via vinyl hose to 5g bucket. Start truck and the tranny pump will pump new fluid through system into bucket. Shut off when bucket is half full (majority fluid pumped out). Add equivalent new back in. Reconnect tranny cooler line. Restart truck, level ground, warm up, shift through forward/reverse gears with brake on, recheck level and adjust accordingly.
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