Duramax Diesels Forum Truck of the Week
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Old 02-17-2018, 06:20 AM
Cnrenner Cnrenner is offline
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Default Help where to start looking

Ok i have 2012 was driving home yesturday got into the gas ran rpms up to about 3200 before shifting but drove fine after that. stopped shut it off for awhile get back in it start driving get about 8 miles come to stop n it sounds like someone is beating on a drum under my hood. So i drove to next gravel pulled off n shut it down sitting on trailer still. No check engine light on. Any suggestions would be great.
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Old 02-17-2018, 07:23 AM
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Open the hood and remove the oil cap while running.... Or just try to hear where it's coming from
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Old 02-17-2018, 08:04 AM
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Give as much info about the truck as you can , miles , tuner , mods , how truck is used etc Do you have a way to read inj rates ?
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Old 02-17-2018, 08:17 AM
Cnrenner Cnrenner is offline
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The truck used lightly car trailers n boats. Mileage 124k head gasket done 1/2/17 by dealership. Has all delets done and a 30hp tune done. The thumping sound is coming from the air box and the engine has a tick but its had to tell which side tick is coming from cuz of the thumping in the air box
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Old 02-17-2018, 08:30 AM
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Could be broken push rod , broken rocker , stuck injector , get rates on tech 2 or edge . I hope its something small like injector wiring !
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Old 04-04-2018, 01:08 PM
Cnrenner Cnrenner is offline
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Found the culprit #4 injector was bad thanks everyone for the responses
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Old 04-04-2018, 03:10 PM
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thanks for sharing the outcome. will help someone else down the road. glad you got it fixed
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Old 05-25-2018, 09:08 AM
Cnrenner Cnrenner is offline
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Sorry for some of the miss information replacing injector took care of have one out of balance but did not fix the thumping noise checked compression all within 5lbs of each other checked valve lash all right at .120 did leak down test on a few cylinders they were at 3-4%. So we are still scratching our heads. Any more help or suggestions would b great.
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Old 05-25-2018, 09:18 AM
Bdsankey Bdsankey is offline
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Quote:
Originally Posted by Cnrenner View Post
Sorry for some of the miss information replacing injector took care of have one out of balance but did not fix the thumping noise checked compression all within 5lbs of each other checked valve lash all right at .120 did leak down test on a few cylinders they were at 3-4%. So we are still scratching our heads. Any more help or suggestions would b great.
Is your valve lash 0.120" or 0.012"? There is a huge difference between them. One is proper and the other is 10x what it should be.

Proper valve lash is 0.012"
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Old 05-27-2018, 06:50 PM
Cnrenner Cnrenner is offline
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My bad they are .012 proper
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Old 05-28-2018, 05:12 AM
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Torque converter come apart? Might be transferring sound thru crank to front of motor. Or I hate to say it, broken crank? Is the crank balancer wobbling?
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Old 05-31-2018, 11:19 AM
Cnrenner Cnrenner is offline
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Idk about the crank but the converter is still good cuz i drove it up on a trailer no problem. If u put ur hand on airbox u can feel it there n hear it put hand on motor feels like running motor no stutters.
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Old 05-31-2018, 11:49 AM
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Sounds like a valve is not opening or not sealing properly causing it to blow back through the intake, but this should have shown up on a compression test. What was the compression? The only other thing I can think of is if the cam pin sheared and threw cam timing out of whack.
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