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Knock on startup/5.9 magnum

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Old 04-05-2018, 07:40 PM
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Default Knock on startup/5.9 magnum
Hey guys new to the forum,
been having this issue with my truck for awhile now and trying to figure out what the cause is. I have a 97 dodge 2500 5.9 magnum outback (not sure outback makes a difference). When i start it up it makes a knocking noise then goes away. I dont notice any rough idles or misfires. It does burn oil and mostly on startup. It is lacking power and i notice it sounds like it sucks alot of air.
Could this knocking be a plenum issue?
thanks
 
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Old 04-05-2018, 07:52 PM
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Could be in the belt drive or the timing chain. There is a good chance the plenum is leaking. The leaking plenum sucks engine oil and can clog your Cat also.
 
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Old 04-05-2018, 07:58 PM
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Originally Posted by 2bit
Could be in the belt drive or the timing chain. There is a good chance the plenum is leaking. The leaking plenum sucks engine oil and can clog your Cat also.
thanks for the quick response, i had an idea that its the plenum and planned on replacing it. I just replaced the pcv valve also. But like i said its only on startup but doesnt run rough or idle rough or anything like that. So i was just wondering why only when i start it
 
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Old 04-05-2018, 09:04 PM
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With the age of your truck, consider replacing the timing set, water pump, thermostat, and O2 sensor, if you replace the plenum gasket. You've got most of the work done to get to the timing chain. I ground the tips off the plenum bolts and reused the steel plate with Fel-Pro gaskets. Search the DIY section for the kegger mod, it allows a little more airflow at higher RPMs.
 
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Old 04-05-2018, 09:09 PM
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Awesome thanks for the info. I will consider doing the chain also. I did do a new water pump and thermostat awhile back. Where would i find the diy kegger mod? Also grounding the tips is because they were too long from the factory right?
 
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Old 04-06-2018, 06:26 AM
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When you start it look at the oil pressure gauge, If the knocking stops as soon as you start to have oil pressure you have worn rod bearings.
 
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Old 04-06-2018, 06:29 AM
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Originally Posted by Moparite
When you start it look at the oil pressure gauge, If the knocking stops as soon as you start to have oil pressure you have worn rod bearings.
to me the oil pressure seems too low, sits below 40. If im not mistaken, it should be higher then that shouldnt it?
 
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Old 04-06-2018, 08:03 AM
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With the engine idling, fully warmed, anything over 10 PSI is considered 'acceptable'.... Personally, I still think that's a tad low, I like to see 25-30 psi at idle, fully warmed.
 
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Old 04-06-2018, 12:21 PM
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Might want to consider pulling the oil pan and replace the oil pump and oil pump screen plus check the connecting rods for loose bearings.
 
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Old 04-06-2018, 12:55 PM
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Since when did Dodge build Subaru trucks?
 
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