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  1. jrdecat

    Crank No Start After Driving

    Got under the hood again today to watch and listen while it runs. I noticed that there is some residue / indication of leaking where the IM meets the head and also around a couple of the fuel injectors. I had been keeping my engine so clean since the swap that I had never seen any of that. Now...
  2. jrdecat

    Crank No Start After Driving

    Ran down to AutoZone to borrow their fuel pressure gauge again. Pressure is 50 with vac line disconnected and now I smell like gasoline again.
  3. jrdecat

    5.3L hard start when warm

    Really? We are both having warm start issues.
  4. jrdecat

    Crank No Start After Driving

    Thank you. I have the flex w/regulator on the rail, so 48-54 w/ vacuum disconnected is the target. Of course, I didn't check with the line disconnected this time around. This is the second time farting around with the fuel pressure gauge and I know I did that last time, and that the pressure...
  5. jrdecat

    Crank No Start After Driving

    I got the vehicle with 105k and now it has 135k. I have never replaced the pump and don't know about its prior history. She's going into the shop for a new front diff in a couple weeks. I'm just going to have them do a little troubleshooting with their fancy scanner.
  6. jrdecat

    Air Compressor Mounting Suggestions

    So I have a Viair compressor and tank setup that I'd like to finally put on after buying it 5 years ago for a different vehicle. Any suggestions on where to mount the tank and compressor? I'm planning on putting some semi truck horns behind the grill and probably put a fitting in the front...
  7. jrdecat

    Crank No Start After Driving

    I did put a noid light on it. I have injector pulse (noid light flashes) and spark from the plug wires while cranking with no start condition. It is the original flex fuel pump and flex injectors which flow at a higher rate. That was taken into account with the tune...or so I'm told.
  8. jrdecat

    Crank No Start After Driving

    Fuel pressure varies from 42# when coasting without pressing on go faster pedal to 50# when I get on 'er like a rat on a cheeto. Here's my log from today with conditions. 12:01pm FP: 40 Water Temp 55* Air Temp 35* Successful start on first crank 12:08pm - turned off - had been driving since...
  9. jrdecat

    Crank No Start After Driving

    9:53am Fuel pressure at 0. Key on and pressure jumps to 50, then down to 48. Crank engine an it starts with water temp of 48* and air temp of 35*. Let run about 15-20 sec at 40# fuel press and then turned off. Waited about 30 sec. Fuel press still at 40. Key on and pressure jumps to 50, then...
  10. jrdecat

    Crank No Start After Driving

    Ok, so now I have a fuel pressure gauge hooked up to the port on the injector rail. 2 Attempted starts under identical conditions with different results. I had just returned from AutoZone to get the gauge and let the beast sit for about 15 minutes. 1. Turn key on, 50 psi. 179* engine temp, 57*...
  11. jrdecat

    Crank No Start After Driving

    Hooked up a noid light to the injector harness and spark tester. I have both spark and injector pulse. I'll pick up a fuel pressure gauge later today and start logging fuel pressure readings. Any other ideas now that I've ruled out injectors not firing or no spark?
  12. jrdecat

    Crank No Start After Driving

    Sooooo close! After finally getting the fuel filter changed, O2 sensors replaced (with OEM), and 2 cans of seafoam in the 1/2 full tank I took Fat Konnie for a test drive. The first start took two bumps like normal, but for the next 2 hours I made 5 stops of about 5-11 minutes in duration and...
  13. jrdecat

    Fuel Filter Replacement 5.3 Flex Fuel

    Resurrected thread!!! Dealt with this crap for about 2 hours. How hard can a fuel filter be? Too bad I didn't read this beforehand! I ruined a disconnect tool in the process.
  14. jrdecat

    Crank No Start After Driving

    Scangauge II. Definitely not a high end tool...like myself.
  15. jrdecat

    Crank No Start After Driving

    I found an email that had some numbers from my last fuel pressure test... With key on engine off, the fuel pressure pops right to 52. After running it drops to 15 within a few hours and to zero overnight. If it was a fuel pump losing prime, then I wouldn't have a problem starting right after...
  16. jrdecat

    Crank No Start After Driving

    Good points. I did have a fuel pressure gauge hooked up and don't remember the exact readings, but that that they were "in spec" from my understanding. I will borrow the gauge from AutoZone again and get an exact reading. No codes.
  17. jrdecat

    Crank No Start After Driving

    Well it's time to bring out the big guns (that's you guys). Last year I swapped in an LQ4 into Fat Konnie (Yukon XL). Specs are in my sig. I have a very strange, but not unheard of, starting issue. When I did the swap I put in all new AC Delco sensors on the motor) with the exception of the MAF...
  18. jrdecat

    5.3L hard start when warm

    Similar but not exact same problem here. Mine started after my LQ4 swap and my vehicle sat for quite a while during the process. I replaced all the sensors at that time. 70% of the time it fires up correctly when cold. The other 30% it will crank and crank and crank without ever starting and the...
  19. jrdecat

    Will 5.3 to 6.0 (LQ4) make a big difference in towing?

    I had this same dilemma about a year ago. 2003 Yukon XL w/ 3.73 gears and the 4L65e tranny. I live near Denver and Fat Konnie was a slug when I headed into the mountains...or drove up anything steeper than a 1% incline. So I bought a rebuilt LQ4 with upgraded Comp Cam roller setup, upgraded...
  20. jrdecat

    Delayed Crank

    Not attempting to hijack...just checking for updates. Thought it would be easier to ask the OP for an update than to start the troubleshooting process over again. Sounds like we are having a very similar issue.
  21. jrdecat

    Delayed Crank

    Any update? I have the same issue on my 2003 Yukon with LQ4 swap. Worked fine before the swap, but it took me about 6 months to get it buttoned up and ever since then it has the extended crank after being ran. It sometimes has the extended crank when cold, but always when hot. I just turn the...
  22. jrdecat

    Climate Control Temp Display

    So....any ideas whey they do this? Is the fix to buy a new HVAC control module?
  23. jrdecat

    Climate Control Temp Display

    does yours do that too?
  24. jrdecat

    Climate Control Temp Display

    I have a 2003 Yukon XL SLT with the digital climate control display. As I turn the knob to change the temperature the numbers are very sporadic. For example: temp is set on 60 and I want to switch to heat. As I turn the knob clockwise the display goes...
  25. jrdecat

    New To Me 2003 Yukon XL

    deleting the chrome strip and matching tint on the front windows are next. I only snapped one pic of the interior, along with my mai reason for going XL. Driver seat is a little ripped and the radio buttons are worn, other than that it's great. I like having a few defects so I don't feel bad...

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