Seems to have 2 different designs of coils and therefore different connectors?
GMC 6.0 Ran fine until I changed plugs, wires, coils.
- Thread starter RobertRN
- Start date
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Well, I can't take a pic of the harness behind the coil bracket it is long gone. It was falling apart from old age. During this 3 week stent, getting ready for summer and some other things were in need; I live in South Florida and my dash had completely rotted out to where a carpet cover could not fix it. I replaced all 6 HVAC actuators (4 in front, 2 in rear) they were either grinding or stuck, new blower this one was squeaking, new resister, fixed 3 chassis grounds that were looking shady, new dash cover and basel, and put a can of injector cleaner in this tank of gas, also due for oil change so I'm trying the Valvoline Restore and Protect. I also replaced the PCV hose connector it was looking like it was going to crack.
So since replacing the harness, wires, plugs, coolant temp sender, MAS sensor and cleaned out the carbon on the intake, it starts up runs ok down the road. The idle seems low but is showing 500 on the tach like always.
THE NEW ISSUE - The DIC instant MPG is very strange, going 50 mph on a flat road at operating temp, it is very erratic. Every time it changes it will be like 35, 12, 6, 28, 16, 2, 26, 10, 4, 38....if I am really focused into this I think I feel the engine sooth out at the higher numbers it could be just me.
I only have a cheap code reader and it is showing no codes. Any suggestions, sorry for being winded but wanted you to know all I have done. This truck has been amazing, I have owned since brand new and has never left me anywhere. Always starts, if the check engine light came on I would freak. It has never, except above but fixed that and cleared the codes.
If you think it needs a more intelligent code reader does anyone know someone trustworthy in the Fort Lauderdale area I can take it to.
Thank you
Bob
So since replacing the harness, wires, plugs, coolant temp sender, MAS sensor and cleaned out the carbon on the intake, it starts up runs ok down the road. The idle seems low but is showing 500 on the tach like always.
THE NEW ISSUE - The DIC instant MPG is very strange, going 50 mph on a flat road at operating temp, it is very erratic. Every time it changes it will be like 35, 12, 6, 28, 16, 2, 26, 10, 4, 38....if I am really focused into this I think I feel the engine sooth out at the higher numbers it could be just me.
I only have a cheap code reader and it is showing no codes. Any suggestions, sorry for being winded but wanted you to know all I have done. This truck has been amazing, I have owned since brand new and has never left me anywhere. Always starts, if the check engine light came on I would freak. It has never, except above but fixed that and cleared the codes.
If you think it needs a more intelligent code reader does anyone know someone trustworthy in the Fort Lauderdale area I can take it to.
Thank you
Bob
Here is what I am working on.
2004 GMC Yukon XL SLT 2500 with 6.0 has 179,000 miles only owner. I wrapped the whole thing last fall because Florida loves to eat clear coat and was looking pretty bad. Took a month but was well worth it.
Had to cut it out so no pic. Sorry. I left the new harness out front. I have never had that bracket off not sure why unless just a mistake during assembly in the factory.
New strange issue has surfaced, I have been driving it for two weeks now. Starts great, runs ok down the road, idle seems low though. Here is the weird thing; when at a constant speed on a flat road (I live in South Florida so not an issue). The DIC instant Econ jumps all over. It will be for example - 20, 12, 3, 14, 33, 23, 15, 4, 13, 19, 2, 17. There is no rhyme or reason, if I tune myself into this I think I feel the engine smooth out at higher numbers.
I thought it was the air compressor so I turned it off and no change. The compressor is getting due for replacement. I do notice when it kicks in and did not. I have not codes im stumped to what is causing such weird variance, any suggestions? I only have a cheap code reader. If I need an advanced read anybody know anyone trustworthy in Fort Lauderdale area. My cheetah is still limping a little and need her top notch. Please help.
I thought it was the air compressor so I turned it off and no change. The compressor is getting due for replacement. I do notice when it kicks in and did not. I have not codes im stumped to what is causing such weird variance, any suggestions? I only have a cheap code reader. If I need an advanced read anybody know anyone trustworthy in Fort Lauderdale area. My cheetah is still limping a little and need her top notch. Please help.
