I just purchased a 2001 GMC 2500 4x4 LB7 with 150,000m. The truck starts great, runs strong, no turbo lag. It appears to be in decent running order with only minor things to clean it up: Leaky Hydro-Boost power steering pump hose, change all fluids, and charge AC.
I do get a really faint white smoke at idle / stop lights. I am confused with contradictory messages on many threads stating everything from normal to total injector failure. I have the complete maintenance records from GM. GM did change all the fuel rails and injectors at 90,000 miles, new water pump at 80,000, and new transmission at 140,000. The prior owner appeared to do good maintenance on this rig. There are two question I have which I would love some input.
#1: It seems odd to me that the new injectors would start to go bad in only 60k miles from replacement. I did put an injector cleaner in the tank and I will run through it before I re-fill it completely. I did have the local Chevy Service Manager look at the truck and drive it and he didn't raise any red flags. I do not plan on running this truck very hard and only plan on 5-8,000 mile a year towing horses. If I can get another 20,000 to 30,000 with the current injectors I would be pleased, but I also do not want to have bad fuel millage. I have heard the white smoke is un-burnt diesel, which will kill my fuel millage.
#2: The temperature is hovering just below 180 degrees on the gauge. I did buy GM thermostats and planned on replacing them just in case. I figure the $120 spend is cheap insurance, yet I realized the temp rating on the new thermostats is 180 degrees, the same that the truck is running. I don’t want to change the thermostats, just to do it. I am a believer if it isn’t broken don’t fix it.
I do not plan on doing any modifications to the truck; I plan on leaving it stock to maintain the maintenance and reliability of the original. Any suggestion, recommendations, or insight would be appreciated? I am new to diesels.
I do get a really faint white smoke at idle / stop lights. I am confused with contradictory messages on many threads stating everything from normal to total injector failure. I have the complete maintenance records from GM. GM did change all the fuel rails and injectors at 90,000 miles, new water pump at 80,000, and new transmission at 140,000. The prior owner appeared to do good maintenance on this rig. There are two question I have which I would love some input.
#1: It seems odd to me that the new injectors would start to go bad in only 60k miles from replacement. I did put an injector cleaner in the tank and I will run through it before I re-fill it completely. I did have the local Chevy Service Manager look at the truck and drive it and he didn't raise any red flags. I do not plan on running this truck very hard and only plan on 5-8,000 mile a year towing horses. If I can get another 20,000 to 30,000 with the current injectors I would be pleased, but I also do not want to have bad fuel millage. I have heard the white smoke is un-burnt diesel, which will kill my fuel millage.
#2: The temperature is hovering just below 180 degrees on the gauge. I did buy GM thermostats and planned on replacing them just in case. I figure the $120 spend is cheap insurance, yet I realized the temp rating on the new thermostats is 180 degrees, the same that the truck is running. I don’t want to change the thermostats, just to do it. I am a believer if it isn’t broken don’t fix it.
I do not plan on doing any modifications to the truck; I plan on leaving it stock to maintain the maintenance and reliability of the original. Any suggestion, recommendations, or insight would be appreciated? I am new to diesels.
