Water will seep from the underside of the pump. This one is fairly common and unfortunately a huge pain in the butt to change. Water Pumps – Another issue with the LB7 Duramax is the water pump leaking. It is extremely important to have the heads surfaced flat before putting the truck back together. We recommend using ARP head studs for a high clamp load along with one of our head gasket kits to fix it. If it is rock hard, you have a head gasket issue. You should be able to squeeze the hose very easily. You can check for a head gasket issue by squeezing the top radiator hose when the engine is running and right after you shut it off. The pressure will cause the coolant to be pushed out the coolant overflow. This allows the layers of the gasket to separate which lets combustion pressure into the coolant system.
What happens is the head lifts a little during the compression stroke. When they have issues, they do not typically smoke out the exhaust or get coolant into the cylinders. The Duramax has a multi-layer steel head gasket. Head Gaskets – As these truck reach the 100,000-150,000 miles we are seeing more and more head gasket issues.
#Plugged in new 7.3 injector driver module code#
You will usually get a diagnostic trouble code for the cooler when they go bad. Lastly we replace a fair amount of glow plug controllers as well. Also the metal strips that connect the glow plugs together on each side corrode and break causing issues.
Not only does the threaded metal part of the glow plug seize in the head, but the tips of the glow plugs sometimes bulb making it really difficult to get them out. The glow plugs burn out over time and can be a real nuisance to remove from the aluminum heads sometimes. Glow Plug System Issues – Nearly half of the check engine lights that come in for the Duramax pickups are for glow plugs. This can produce long cranks and hard starts. Under the primer button there are some orings that fail on a regular basis. While we are seeing more and more rusted out fuel lines causing the engines to suck air, nine times out of ten the issues are in the fuel filter head. The injection pump sucks all the fuel from the tank. The new injectors available from us and others are updated and do not have the cracking issue.įuel Filter Housing Oring Leaks – The Duramax fuel system does not have any sort of low pressure fuel pump pushing fuel to the engine from the tank. Injector replacement on the LB7 truck is rather labor intensive and just changing one is usually not worth the risk for the labor costs. Unfortunately the best thing to do if you have this problem is to replace the whole set at once. The symptoms are constant smoke at idle and gaining fuel in the oil. The original injectors that came in these trucks had all sorts of issues with cracking. Injectors – It’s hard to have a conversation with any LB7 owner without the topic of injector issues coming up. Over the years these trucks have been really good performers, but they do have some common problems that we see over and over again. If you have a 2001-2004 Duramax 6.6 LB7 diesel pickup or are looking to buy one, here are some common issues and problems we have run into in our shop. GMC and Chevy Duramax LB7 6.6 Diesel Common Issues and Problems
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