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Tek
Dodge Dakota
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8/17/2005
16:53:05
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 Subject: Knocking
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Does anyone else have a really bad knock on their 96' 3.9L ? I've been trying to track down the problem on mine to get my engine running smooth and this would be my first step. Any ideas guys?
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daddio
Dodge Dakota
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8/17/2005
16:59:47
|  RE: Knocking
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how's your oil pressure? has it ever run low on oil? a loud knock is not good.
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Tek
Dodge Dakota
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8/17/2005
18:06:11
| RE: Knocking
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oil pressure is fine and has been ever since I've had the truck. Then again, it's been knocking for a long time also... It's not really loud, but is noticeable from the cab.
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daddio
Dodge Dakota
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8/17/2005
18:25:41
| RE: Knocking
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does it vary with rpm?
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tek
Dodge Dakota
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8/17/2005
22:07:23
| RE: Knocking
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it seems to go away when the rpm's are up, but I might just not be able to hear it over the exhaust and engine.
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schmidtmike
Dodge Dakota
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8/17/2005
23:48:58
| RE: Knocking
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Sounds like the timing chain. It sounds a lot like a knock on mine too, but the timing chain sounds like a knock when it's really loose, and tends to go away when you rev the engine. Plus it affects timing and smoothness too.
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tek
Dodge Dakota
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8/18/2005
00:36:30
| RE: Knocking
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I've had the timing chain replaced when i got the truck a year ago and have only put 17 k on it.
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hum
Dodge Dakota
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8/18/2005
09:25:21
| RE: Knocking
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get an auto stethascope and find out where the knock iscoming from. I had a chevy that had a knock and it was a bolt on the flexplate that had gotten lose.
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jayb
Dodge Dakota
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8/18/2005
16:37:40
| RE: Knocking
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my 93 5.2 does the same thing, but it doesnt lose any power what so ever. it goes away with rpms as well. ive determined its a lifter. what kind of oil do you run? anything thinner than 10w30 is not recommended at all.
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tek
Dodge Dakota
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8/18/2005
22:44:53
| RE: Knocking
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right now I've got 5w-30 full synthetic in it, I'ma try an oil stabilizer here in a day or two.
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Relf
Dodge Dakota
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8/19/2005
01:21:01
| RE: Knocking
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tek, If you're due for an oil change then I would suggest pouring some seafoam in the crankcase and let your engine idle for 5-10 minutes before dumping it. It might help loosen anything that is sticking. Or better yet, find a shop that has the bilstein engine flush machine. This way they dump your oil and hook up the machine to your oil filter and flow warm solvent through and vacuum it out of your drain plug. It basically back flushes your engine. It's about 70-80 bucks and some Pep-boys shops have this service.
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jayb
Dodge Dakota
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8/19/2005
10:18:55
| RE: Knocking
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mine started knocking after i put 5w30 full syn in there. horrible idea. the lifters get f'ed up from the oil. its way too thin.you need to change it right now. not tomorrow. right now. pissing in your engine would work better than 5w30.
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White_Knucles
Dodge Dakota
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8/20/2005
02:06:59
| RE: Knocking
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Does it go away or fade if you slip it into Park or Neutral? How about clutch engaged or disengaged with a manual trans. Mine, ’99 with 70K, duplicates a subtle knock you hear almost amplified by the cab only when warm only in drive at idle.
Being curious I traced the death out of it and with a mech. scope found the hot spot on the front side of the oil pan. Asked a few more qualified wrenches including two dealer techs what they thought.
Result - not a major concern unless it gets louder. The engine has somewhat “lose” tolerances and 3 agreed they’ve heard similar low idle knock before.
You need the scope and it is not detected outside or underneath the truck at idle.
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tek
Dodge Dakota
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8/21/2005
21:28:51
| RE: Knocking
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according to the manual, the knocking I hear can be normal when running 87 octane gas. I tried a different gas station and the knocking seems to have gotten quieter. I'ma take my time and really look into it, I'll let you guys know what I come up with.
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jayb
Dodge Dakota
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8/22/2005
10:21:43
| RE: Knocking
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it may be a lifter if:
1. goes away with rpm
2. you lose no oil pressure
3. it gets a little or much more quieter after warmup
4. it appears to come from the top end.
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jayb
Dodge Dakota
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8/23/2005
19:10:19
| RE: Knocking
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i certainly hope you changed out that sh!tty 5w30 oil. that was the worst thing i ever did to my dodge. i noticed alot of things happen to it. the lifters started knocking. it had a decent lack of power do to high amount of friction in the engine with thin oil. and it over heated easily on steep hills.
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93dak4x4
Dodge Dakota
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8/23/2005
20:59:00
| RE: Knocking
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if you want to know if it is a serious oil pressure or bearing related problem then change the oil and cut open the oil filter. The filter will have metal flakes from the bearing if its a rod or crank knock. just make sure you cut it in a way that you won't add metal to the filter when cutting...i e knife or something sharp, no grinding.
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schmidtmike
Dodge Dakota
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8/25/2005
02:31:32
| RE: Knocking
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jayb, I don't know if it was so much the oil that did your engine in, but the detergent factor of it will loosen deposits very quickly, so if your lifters were already on their last leg, then odds are the synthetic did them in (Remember, synthetic only amplifies internal engine problems)
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tek
Dodge Dakota
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8/25/2005
13:22:27
|  RE: Knocking
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I checked what oil I had and I was running 10w-30.
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dakotaer
Dodge Dakota
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11/08/2005
21:44:58
| RE: Knocking
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my 3.9 1999 dakota was knocking and iwiggled the fan and it was loose so i put a new fan clutch on it and then there was no knocking. just check the fan see if it has too much play in it.
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zzark
Dodge Dakota
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11/10/2005
22:44:37
| RE: Knocking
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This TSB about plug wire reroute also mentions ping/knocking.
http://dodgeram.info/tsb/1998/18-48-98/18-48-98-v6.htm
zzark
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