joshua Posted December 30, 2016 Share Posted December 30, 2016 This is a query regarding my Duramax 6.6L. Recently I noticed some acceleration issues with it. I thought it might be due to the dusty air filter. I bought one from BC Diesel (http://bcdiesel.ca/) and replaced it. But still, it is not okay. What could be the other elements that affect GM diesel performance? Somebody here who have got expertise in GM repair, please help me with your suggestions. Quote Link to comment https://www.bigmacktrucks.com/topic/48147-gm-performance-issues/ Share on other sites More sharing options...
fxfymn Posted December 31, 2016 Share Posted December 31, 2016 Like any diesel performance depends on having enough fuel and air. My first shot would be to replace the fuel filter. Next, especially if it is an older DMax, would be to check fuel pressure and consider adding a lift pump. I assume it is not showing any codes? Here is a great forum to search out answers to DMax issues: http://www.dieselplace.com/forum/index.php 1 Quote Money, sex, and fire; everybody thinks everyone else is getting more than they are! Link to comment https://www.bigmacktrucks.com/topic/48147-gm-performance-issues/#findComment-356570 Share on other sites More sharing options...
RowdyRebel Posted January 1, 2017 Share Posted January 1, 2017 GM? Not running right? Nah...couldn't be true! [/sarcasm] Hope you don't have to throw as much money at yours as I've put into my Suburban...and it STILL ain't right! Quote When approaching a 4-way stop, the vehicle with the biggest tires has the right of way! Link to comment https://www.bigmacktrucks.com/topic/48147-gm-performance-issues/#findComment-356736 Share on other sites More sharing options...
Dirtymilkman Posted January 5, 2017 Share Posted January 5, 2017 Fuel filters are definitely the culprits alot now. When the "new generation" diesels came out, fuel filters got really restrictive. I think the big three are talking changing filters at 20,000 miles. Quote Link to comment https://www.bigmacktrucks.com/topic/48147-gm-performance-issues/#findComment-357239 Share on other sites More sharing options...
fxfymn Posted January 6, 2017 Share Posted January 6, 2017 Quote I think the big three are talking changing filters at 20,000 miles. Both my 2011 DMax and the new 2016 DMax use the "DIC" to tell the operator when it is time to replace the fuel filter. At 98K miles the 2011 has had one or two filters. (If you ever changed a fuel filter on a DMax you remember it, what a PIA.) Quote Money, sex, and fire; everybody thinks everyone else is getting more than they are! Link to comment https://www.bigmacktrucks.com/topic/48147-gm-performance-issues/#findComment-357315 Share on other sites More sharing options...
BillyT Posted January 7, 2017 Share Posted January 7, 2017 I've never worked on a duramax, but as the others say generally speaking when a diesel isn't running right,and you don't have a code in,you replace the filters,Youve done the air,so do the fuel next! The air filter was dusty so there is a real good chance the fuel filters are too! If the trucks mileage is a lot lower than the mileage where the manufacturer recommends fuel filters be replaced,you could try a good injector cleaner Lucas and Howes are good products.assuming the truck isn't running so poorly you're afraid of breaking down! If the filters are vertical spin on they have to primed,diesel fuel atf,or additive works. I believe all vehicles gas or diesel should have an additive at least every other fill up!Good luck Joshua! Quote Link to comment https://www.bigmacktrucks.com/topic/48147-gm-performance-issues/#findComment-357501 Share on other sites More sharing options...
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