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zach
Dodge Dakota
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9/07/2006
14:18:51

Subject: knocking
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Have a 93 sport 3.9 with 123k. I have very loud knocking only when I try to accelerate up a hill. Anyone know what the problem might be?



Obio3
Dodge Dakota
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9/07/2006
15:44:55

RE: knocking
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In the old days. that would be a rod without question.Unless run out of oil, I as yet have heard no rods in these magnum engines. Doesn't mean it don't happen. Guess it could be something else but I'd be parking it till I knew.

So many problems .... So little time



daddio
Dodge Dakota
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9/07/2006
16:09:35

RE: knocking
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if the oil pressure is good it is probably pinging or a loose timing chain.

where is the "loud knocking" sound coming from?



Obio3
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9/07/2006
20:40:21

RE: knocking
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I should have covered those also daddin but he did say LOUD KNOCK. To me that's one cylender so i said it as I did. Guys mean lots of differant things when discribing things and in reality, it's a guessing game to help someone in here. But it does happen

So many problems .... So little time



zach
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9/07/2006
20:47:27

RE: knocking
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Maybe it is not very loud but enough to be easily noticed. Also does it when push on gas pedal hard. Any type of test I can do to determine where it may be coming from?



vern
Dodge Dakota
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9/08/2006
06:49:57

RE: knocking
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zach,does it knock at idle or when you just press on the gas a little?

does the knock sound like you hitting the motor block with a hammer or a rattle-ly knock

in your first post you said just going up a hill,
it maybe spark knock,try some higher octane gas or octane booster to see if it goes away or it maybe something hitting under a load,like the exhurst



bme
Dodge Dakota
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9/08/2006
14:35:32

RE: knocking
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my truck did the same thing, going up hills, and pulling a trailer. I found the distributor cap was the problem. Cleaned it up, there was carbon build up and 'carbon tracks' inside the cap. i would take a look at that, if your truck in pinging up hills.



DP
Dodge Dakota
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9/18/2006
10:14:33

RE: knocking
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Put higher octane gas in it.



Chuck
Dodge Dakota
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3/13/2008
02:33:23

RE: knocking
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My 95 dodge dakota is knocking only when im sitting at an idle its not real loud but its noticeable ive tryed chaning the oil and putting lukes oil treatment in it and its still doing it but like i said it only does it at an idle so if u could please help me figure out what this could me id like to know thanks



ConcertBb
Dodge Dakota
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3/13/2008
07:23:24

RE: knocking
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I was taught that if the knock (I assume it's a loud knock and not a ping or rattle) goes away when you give it some gas that it is a bad bearing. If the knock gets worse it's a bad rod. Neither is a good thing. There is also the valve tap sound. Like the previous guys said, make sure what sound you are describing as the diagnosis will change.



Warren
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3/13/2008
07:57:46

RE: knocking
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Your knock could be several things? I have a 94 dakota 3.9 and it knocked under similar conditions several years ago, only during acceleration or climbing, my oil pressure was good and I didn't give it the attention I should have. It turned out to be a severely worn timing chain and as a result my chain jumped a few teeth and caused the engine to get out of time, this obviously destroyed the engine. My new engine is 3 years old and making the same sound, I'm replacing my timing chain and gears tomorrow. Also, discovered my #1 cylinder valve stem seals are leaking and fouling the #1 spark plug. Good Luck.



fotodak
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3/14/2008
09:15:59

RE: knocking
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A knock only at idle is a sign of low oil pressure. It could be worn bearings or a weak oil pump. When you gas it the pump sends more oil to the bearing. Try a thicker oil.

As the others have said the "knocking" sound on accelleration is actually "pinging". This shouldn't happen, and using higher octane gas only masks the problem. Run some fuel system cleaner such as Seafoam or Techron, Berryman B12 or the like through it.
One other thing could be the dreaded "belly pan" gasket. remove the air filter lid and open the throttle plates. Look don into the throttle body with a flashlight. If there is oil in the bottom of the intake you have found your problem.

My 92 rattles at different rpm depending on the throttle position. Even misses and bucks at very light throttle. Needs a timing chain. The chain is loose enough the valve and ignition timing is moving around.
It's gotta wait until I can change the head gasket on the 4 banger Spirit.



tina
Dodge Dakota
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3/27/2018
13:46:52

Pinging noise from my 93 dakota 3.9.
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So I have this issue with my dakota. it's a 93
3.9L timing chain was donever less than 2
years ago. The sound is more of a clattering
noise, does not do it all the time, only when
accelerating up a hill. I never hear it any
other time and the harder I push it up the
hill the worse it gets...Can anyone give me
suggestions. Like I said timing chain was done
less than 2 years ago, and I just did a fresh
oil change on it it helped a little. It
doesn't make the sound the whole way up the
hill now only when it has a heavy load on it.
Any suggestions would be awesome. Thanks



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