specialagentPK
04-30-2005, 12:17 AM
other than a bad injector is there anything else that can cause fuel knock?
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phazar 04-30-2005, 09:44 PM are you sure its a fuel knock, describe please. specialagentPK 05-01-2005, 12:15 AM a lound knocking sound under acceleration load or hills D/A Power 05-01-2005, 12:37 AM Most likely, it's the pilot injection turning off. It does that under WOT or heavy accel. The pilot injection is what makes these diesels sooo quiet at idle and normal driving. It is normal. Hopefully that is what you have - it worried me at first too, but I soon learned what it was. specialagentPK 05-01-2005, 01:56 AM but it happens below 2000 rpm i thought the pilot injection comes off at aroung 2600 also it doesent sound like the pilot injection coming off SteveNorCal 05-01-2005, 03:22 AM If you have a newer Dmax, there is a reflash available for the PCM that addresses fuel knock. Do a search here at DP about this, there is a huge amount of info about this problem. Bodysurfer 05-01-2005, 08:55 AM Ya, got the knock thing too. Hear it when taking off after a stop. Sounds like you are floating a valve like a gasser....pinging or slapping of valves. I have the LB7 motor. Anyone with a answer? LATER!!! dieselfumes57 05-01-2005, 10:19 AM i got it too. sounds worse i think when i add additive phazar 05-01-2005, 08:31 PM check out my post guys, duramax tear down, have the dealer go for a drive and while driving, shut down each cylinder at a time until noise is gone. mine was cylinder 8. pfdhoser 06-24-2005, 07:06 PM finally someone else with the same problem. does anyone else's also seem to be lacking in power. the dealer told me to change the fuel filter and also that the noise was normal. damax 06-24-2005, 10:48 PM a buddy of mine had knock that you describe in his 03 lb7 stealer replaced vacuum pump. truck runs fine now. | ||