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  1. rockola1971

    07 LT 5.3L Sudden no start/crank

    I would reposition the wire on the top right where it is up against that stab so it doesnt rub through the insulation later on down the road. Add a couple dabs of silicone gasket maker or even caulking to the wire to glue it down on the board and in place. That wire is plenty large enough for...
  2. rockola1971

    07 LT 5.3L Sudden no start/crank

    Your middle pic shows a trace that has acted like a fuse because the current passing through it exceeded its rating. So that trace heated up excessively and melted just like a fuse element does. You can lightly scrape the green color off of the trace on both good sides of the fused trace and...
  3. rockola1971

    07 LT 5.3L Sudden no start/crank

    That sure is odd. That circuit board doesnt appear to be a multilayer circuit board. So just the traces on the top there in the pic and likely ones on the underside as well. Not alot to go wrong there and if it does it usually shows a physical defect. Id have to so better pic and the ground...
  4. rockola1971

    07 LT 5.3L Sudden no start/crank

    I see what you did there. Are you one of those neutral kinda guys. Swiss maybe?
  5. rockola1971

    07 LT 5.3L Sudden no start/crank

    Im not really concerned with the 8v right now since it didnt happen when the key was in crank position. The 12v according to OP was there in crank position so thats all the relay coil needs for the hot side. Now im concerned about the ground side not being there which would explain his symptom...
  6. rockola1971

    07 LT 5.3L Sudden no start/crank

    Dont we already know that is happening since OP is getting 12v at the relay coil when key is turned to engine crank? No way for that to get there without PCM and BCM being happy.
  7. rockola1971

    07 LT 5.3L Sudden no start/crank

    Scanner will be practically useless for this failure other than to see input and output state of BCM and PCM. Need to ohm that ground terminal in the relay socket to chassis ground to see if it is electrically connected and rule out a busted wire.
  8. rockola1971

    07 LT 5.3L Sudden no start/crank

    The Constant on 12v is the feed to the starter motor solenoid. This is part of the controlled part of the relay (Normally open Contacts). It seems your problem is in the control side of the relay (Coil). Not sure what that 8v is about but you have 12v when the key is put to the crank position...
  9. rockola1971

    07 LT 5.3L Sudden no start/crank

    Im on it! :head3:
  10. rockola1971

    07 LT 5.3L Sudden no start/crank

    Im not quite sure what you jumpered in the ignition relay whether it be the control side or the controlled side. Im assuming you jumped the 2 contacts for the controlled side which is what feeds the 12v to the starter solenoid to initiate starter spinning over among other things that happen...
  11. rockola1971

    Wheel hu.

    Halfshafts make their noise during turns. When you hit the brakes you are changing the loading on the front hub bearings. Just raise the front wheels off the ground enough to turn the tires and spin them. Listen for some growling. Grab the tire like mentioned above and you'll feel some...
  12. rockola1971

    Dragging brakes 2004 Yukon

    Take it for a spin and hit each rotor with a IR gun and see which one(s) are running the hottest. There's your sticking calipers. And Id bet that you have air in your ABS manifold if youve never ran a bidirectional scanner to bleed the system. There usually is just no way around it.
  13. rockola1971

    Wiring issue - Crank, No Start

    You are very welcome. Get that ground fixed and back to factory original spec.
  14. rockola1971

    CV axles

    There is a reason that spec for tightening up an axle nut is around 150ft lbs or so. Dont do it and that is the #1 cause of premature hub bearing failure. It wont be an immediate failure but that hub bearing wont last a year. I would imagine no load at all (No axle stub installed) would cause...
  15. rockola1971

    CV axles

    Oh thats right. Its been awile. Im used to the older style that have a c clip locking them in back in my days of rebuilding transmission. FWD were always a blast..not. Still gotta have that over 100ft lbs of preload on the hub to keep it together. Junk Stub works just fine.
  16. rockola1971

    CV axles

    You pull a CV halfshaft out and drive it like that, it will cause a problems. Your hub bearing no longer being loaded and will come apart. Might have to get vehicle up on a lift and hope you can hear where noise is coming from without vehicle weight on driveline. **Corrected**
  17. rockola1971

    Bizarre Steering Gearbox failure/worn out

    My 2003 Chevy Tahoe LT 4x4 almost 300k had a first for me that Ive ever seen on any GM fullsize chassis. I had been fighting the front end starting to feel like the front wheels were in sand. Starting from a dead stop and coming to a dead stop the front wheels were zig zagging, along with some...
  18. rockola1971

    Wiring issue - Crank, No Start

    Terminal Pinout Ignition Coil 86 (Relay coil +) 85 (relay coil -) 30 Power source for load 87 Device (load) Firstly your 11.5v readings should be well above 12v, along the lines of 12.6v + so charge that battery. Low battery could cause your ignition relay to chatter. Terminals 85 and 87 will...
  19. rockola1971

    Wiring issue - Crank, No Start

    1.1v at PCM1 aint gonna cut it. Thats a problem. So there should be battery voltage there when cranking and its source is IGN B 40a fuse (Hot all the time) then it goes to your ignition switch and out terminal C (Pink wire) when in start or run position then to your IGN 1 relay (THE COIL of...
  20. rockola1971

    2001 yukon denali 6.0 oil in cylinder 1 and 3

    Head gasket replace for oil in the cylinders? Watchu talkin' about Willis???? Youve got oil running down valve stems because of bad valve seals or you have bad rings on those cylinders. A compression check across all 8 cylinders will tell you whats up with your rings. Otherwise pull your...
  21. rockola1971

    oil leak - Crankshaft Front Seal

    I would expect lots of glitter in your oil if your cam bearings were bad and also lots of valvetrain noise. Did you verify that you have no coolant in your oil? Could have blown a head gasket from the overheat incident. Verify you dont have an unusually large amount of bubbles/air come into...
  22. rockola1971

    5.3 Tick/Knock?

    Your oil pressure numbers are fine. General rule of thumb is 10psi for every 1000 rpm. We of course get much more than that at idle. Lack of oil changes (dirty oil) can cause crap buildup in your oil passages and in your lifter bodies which can cause them to stick. That crap in your oil will...
  23. rockola1971

    Wiring issue - Crank, No Start

    OK now things are starting to make some sense here. Your PCM 1 fuse ONLY gets 12v when you are in Run and STart position with your key via the ignition switch. The actual electrical ignition switch which is down low and right side of your steering column shroud provides that 12v to your PCM 1...
  24. rockola1971

    Wiring issue - Crank, No Start

    You're in luck....former aviation electrician USN and been an electronic tech and electrician for decades now. Need to know what trim package (SLE, SLT) and 2wd/4wd/AWD and what are the 2 fuses exact name in the fuse box cover table? (ECU1? or ?) Yours has a ECU and TCM in 2004 instead of just...
  25. rockola1971

    5.3 Tick/Knock?

    You can let it sit all day at idle if you want but if you have a stuck lifter, the tranny fluid will circulate and free it up within 10-15mins. You can give the engine some revs but me personally I do not load the engine down out on the street with anything but oil in it. Ive even heard of...

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