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  1. R

    2003 6.0 throttle body question

    Forgot to mention a few things. First I was able to get in touch with the guy I bought this from last May. He told me he had replaced the throttle body with a new one about a year before that. Someone had already replaced the connector and they thought that would cure it but it’s apparent it did...
  2. R

    2003 6.0 throttle body question

    I would be interested in seeing that bulletin as well. Today I replaced all 4, 02 sensors. Hoping that will take care of the 0420 cat code. I then took the plug I got at the salvage yard and spliced it into the harness for the throttle body. Also went and got 8 AC Delco spark plugs and...
  3. R

    2003 6.0 throttle body question

    I have a 2003 Yukon Denali with a 6.0. There I a plug for the wiring harness that pushes in the front corner of the throttle body. About every 100 miles or so while driving my traction control light will come on and I loss all power. The vehicle goes into creep mode. I will pull over, shut off...
  4. R

    Smoke testing Procedure help needed

    When you say ignition cables where are you talking about? Rod
  5. R

    Smoke testing Procedure help needed

    I didn't drove the vehicle over the winter since I use it only to tow my mowers 3 days a week from April thru November. So this spring I did a leak test and found no leak so I went and replaced the MAF because i was getting some weird numbers. That cured my CEL light for almost 2 weeks then...
  6. R

    Elecrical problem 2003 6.0 Yukon

    So last weekend while I was away I disconnected the battery so not to drain it dead. Came home Monday morning and hooked cable back up so I could use it to tow my mowers and there were no lights on in dash cluster. I ran it 3 days this week and no d cluster readout or dimly lit lights in dash...
  7. R

    Elecrical problem 2003 6.0 Yukon

    Weather has no effect on this at all. It can be drizzling or dry. The other day the instrument cluster was off for 6 miles then just driving and on smooth road they came back on. The parking light I just notice on Wednesday night, so since I'm away this weekend I pulled the negative battery...
  8. R

    Elecrical problem 2003 6.0 Yukon

    My 2003 has an issue with some type of short. The brake light in the dash cluster is staying on (very dimmly) all the time which includes with key off and all doors closed. It just started doing this 3 days ago. I also am losing my gear selection and mileage reading in the cluster along with my...
  9. R

    Smoke testing Procedure help needed

    The reason I want to do a mole test at the intake is to see if the intake has any leaks. Does the vent valve need to be blocked off to do this? I. Not trying to check for EVAP leak. I am suspecting an intake leak. Rod
  10. R

    Smoke testing Procedure help needed

    Exactly where is this vent valve? Is it solenoid control and if so can I jumper it with a 12v signal?
  11. R

    Smoke testing Procedure help needed

    Nope Nope Nope it was not a hit and run. lol. I was waiting for sometime in the winter to check this engine out. Codes are 171 and 174. This vehicle is only used for towing my mowers from job to job during grass growing season. SO its been sitting most of the time since the first week of...
  12. R

    Smoke testing Procedure help needed

    I have a 2003 Yukon with a 6.0. I bought it in May with 249k miles on it. It runs great but has had the CEL on since i got it. Ive checked and cleared the codes many times during the summer but I needed it everyday to tow my mowers so I didnt have time to get to involved. Now I am done mowing...

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