24 valve knock.. help please... - Dodge Cummins Diesel Forum
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Old 12-17-2011, 12:49 AM   #1 (permalink)
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24 valve knock.. help please...

ok guys, i dont really know alot bout diesels but i drive one... i have a 2000 dodge 2500, the only thing i have on it is the quadzilla adrenaline.. but i went out and started it to let it warm up, noticed it was lopping a little harder than usual.. after letting it sit there and run for 20 mins i took off, went maybe a mile down the road, truck started to sound like the piston was tryin to pound through my head so i turned around and has been parked since.. i made a video of it running and posted it to youtube but im new to the forum and have no idea how to post the video to this.. it is also smoking a little more than usual.. ive had two people tell me two different things.. one said i dropped a valve the other said i lost a tip to an injector so it was fillin my cylinder with fuel..


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Old 12-17-2011, 01:10 AM   #2 (permalink)
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Check your codes with the key trick. If you dont know how, heres how you do it: turn the key on,off,on,off,on and look at the odometer,and report back what codes you have and we'll go from there.
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Old 12-17-2011, 01:16 AM   #3 (permalink)
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the only code it threw was p 1693
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Old 12-17-2011, 01:31 AM   #4 (permalink)
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Did you wait till it showed the p ecu codes? If it showed p pcu 1693 it means u have a a code in the ecu and have to wait till after it says p done after the p pcu. The 1693 is a companion code
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Old 12-17-2011, 01:33 AM   #5 (permalink)
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yeah i turned it on and off twice then the third time it popped up that one code then said p done and went back to the mileage on my truck
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Old 12-17-2011, 01:34 AM   #6 (permalink)
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i would pull the injectors, and you can then also check the condition of the top end of the valve train.

It sounds like a bad miss and a timing knock i think. it is worth pulling the injectors and having them tested, then checking the cylinders.


PO1693 is a companion code, if you can get a scanner and plug it in and pull the codes, you do have a serious issue here.
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Old 12-17-2011, 01:38 AM   #7 (permalink)
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i bought this truck from a guy a few months ago, he had a piston melt down on him so he bought a used motor that supposed to only have like 90,000 miles on it.. ive been having some problems with it not starting in the mornings unless i had it plugged up and it hasnt dropped below 32 degrees yet, so i changed the fuel filter and i havent had to plug it up since, then this happened..
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Old 12-17-2011, 01:47 AM   #8 (permalink)
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Quote:
Originally Posted by chris_jb View Post
i bought this truck from a guy a few months ago, he had a piston melt down on him so he bought a used motor that supposed to only have like 90,000 miles on it.. ive been having some problems with it not starting in the mornings unless i had it plugged up and it hasnt dropped below 32 degrees yet, so i changed the fuel filter and i havent had to plug it up since, then this happened..
he swapped the good motor into the truck?

did you check for an exhaust leak inside the engine bay?

is the exhaust smoke smell like fuel or coolant?

shoot your exhaust manifolds with a temp gun to see if all of your exhaust temps are close, if you have one that is low or runnign cold it could be a dead cylinder.

when you say hard to start does it sound like your having trouble starting it like it has no fuel? once it starts can you restart it?

you might want to pull the valve cover, and take a screw driver and put it to the engine and use it as a suto "Stethoscope" and see if you can pinpoint where the noise is coming from, might be worth pulling the oil pan and checking the underside and the connecting rods for play.

pull the injectors and get them both pop and flow tested.

until you start pinpointing where the noise is coming from can't really help you much beyond this.


Most likely you have a dead injector, or a worn VP-44, something that is causing a timing knock or a delay in the injectors pop open time, and as such is giving you a dead cylinder and can also be the cause of this....

but only more research into this will solve your problem.
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Old 12-17-2011, 01:51 AM   #9 (permalink)
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the exhaust smells like fuel, and ill check for leaks but ive never smelt anything while driving in the cab.. thanks for ur help, looks like im bout to start a tare down here soon..
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Old 12-17-2011, 02:00 AM   #10 (permalink)
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the exhaust smells like fuel, and ill check for leaks but ive never smelt anything while driving in the cab.. thanks for ur help, looks like im bout to start a tare down here soon..
no need to jump into a tear down just yet.

1. shoot your exhaust header with a temp gun, and mark your temps, (it is best to remove the serpentine belt for this to get an accurate reading from the first few cylinders)

*Since it is at idle and your engine cold, there is no worry about overheating the engine or such even when fairly warm, provided your idling and your not runnign to long if your warm.

2. pull valve cover run motor (w/o) serpentine belt at idle and use a screw driver to see if you can pinpoint where in the motor the sound is coming from.

*you don't want to fan runnign so you are not blowing crap all over your motor inside with the valve cover off.

3. do a leak down test/compression test on your motor.

4. pull injectors and have them tested.

5. pull oil pan and check for play in the connecting rods/crankshaft, look for metal deposits in the pan.


I would then check the VP-44 before i pull the head, these trucks are mechanical, so if your VP-44 is screwed up it will cause a timing issue, but since you say you smell alot of fuel out of your exhaust, i would suspect you have a bad injector that is just leaking like crazy.
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Old 12-17-2011, 05:46 PM   #11 (permalink)
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It sounds like a fuel related issuse to me, I would do all that is stated above. I would also get yourself a code reader so that you can see what other codes you have showing.
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Old 01-02-2012, 01:14 AM   #12 (permalink)
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so i finally got my truck loaded up on a trailer and hauled it to my body shop yesterday.. and after waking up with a hang over decided to start takin off my intake and valve cover.. as soon as i got my valve cover off i seen the problem.. number one cylinder exhaust rocker was lose and the little arm thing that sets on top of my two exhaust valves was just laying there next to my intake valves.. so i got that put back on top of my exhaust valves and tightened the rocker arm and checked my clearance and then checked all my other valves and she fired right up and was back to purring like the beast she is.. thanks guys for all ur help and knowledge.. i am glad that there are still decent people in the world that like to help!!!Oh and what I called a knock is what this guy said was a miss since it was a desiel motor.. Lol

Last edited by chris_jb; 01-02-2012 at 06:15 PM.
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